Control method, control device, air conditioning system, storage medium and program product

Abstract

The invention provides a control method, a control device, an air conditioning system, a storage medium and a program product. The air conditioning system comprises a water chilling unit, the control method comprises the steps that parameters of the air conditioning system are obtained, and the parameters comprise the condensation temperature and the condensation temperature change rate of a condenser in the water chilling unit; and under the conditions that the condensation temperature is within the preset risk grade temperature range, the condensation temperature change rate is larger than zero and the duration meets the preset duration, the risk grade of the air conditioning system is determined, and processing corresponding to the risk grade is executed.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air conditioning, and in particular to a control method, a control device, an air conditioning system, a storage medium and a program product. Background Art

[0002] In the actual operation of the air-conditioning system, in order to ensure the safety of the unit, a high and low pressure protector is usually used to control the start and stop of the unit. The group control system in the related technology controls the start and stop of the compressor by collecting the error between the system pressure and the set value in real time, but the factors causing the high pressure protection of the compressor are coupled complexly. The use of the control method in the related technology will cause the refrigeration system to start and stop frequently, reduce the stability of the system operation, and make it difficult for the unit to achieve the expected energy efficiency level, which will cause the system to operate inefficiently for a long time. In the related technology, the air-conditioning system cannot predict possible failures to actively reduce risks or avoid failures. Summary of the invention

[0003] A technical problem solved by the present disclosure is that in the related art, the air conditioning system cannot predict possible failure situations to actively reduce risks or avoid failures.

[0004] According to one aspect of the present disclosure, a control method for an air-conditioning system is provided, wherein the air-conditioning system includes a chiller, and the control method includes: obtaining parameters of the air-conditioning system, wherein the parameters include: a condensing temperature and a condensing temperature change rate of a condenser in the chiller; and when the condensing temperature is within a predetermined risk level temperature range, the condensing temperature change rate is greater than zero, and the duration satisfies a predetermined duration, determining the risk level of the air-conditioning system and performing processing corresponding to the risk level.

[0005] In some embodiments, when the condensing temperature is within a predetermined risk level temperature range, the condensing temperature change rate is greater than zero, and the duration meets a predetermined duration, the risk level of the air-conditioning system is determined, and processing corresponding to the risk level is performed, including: when the condensing temperature is less than or equal to a first temperature threshold and greater than or equal to a second temperature threshold, the condensing temperature change rate is greater than zero, and the duration reaches a first predetermined duration, determining that the air-conditioning system is at a first risk level, and performing processing corresponding to the first risk level; when the condensing temperature is less than the second temperature threshold and greater than or equal to a third temperature threshold, the condensing temperature change rate is greater than zero, and the duration reaches a second predetermined duration, determining that the air-conditioning system is at a second risk level, and performing processing corresponding to the second risk level; and when the condensing temperature is less than the third temperature threshold and greater than or equal to a fourth temperature threshold, the condensing temperature change rate is greater than zero, and the duration reaches a third predetermined duration, determining that the air-conditioning system is at a third risk level, and performing processing corresponding to the third risk level.

[0006] In some embodiments, the parameters also include: the instantaneous value of the cooling water supply and return water temperature difference, the cooling water supply and return water temperature difference setting value, the cooling pump frequency instantaneous value and the cooling pump frequency upper limit value; executing the processing corresponding to the first risk level includes: judging whether the instantaneous value of the cooling water supply and return water temperature difference is greater than the cooling water supply and return water temperature difference setting value; if so, judging whether there is room for the cooling pump to increase the frequency based on the instantaneous value of the cooling pump frequency and the cooling pump frequency upper limit value; otherwise, the operating parameters of the air-conditioning system are not adjusted.

[0007] In some embodiments, the parameters also include: the instantaneous value of the cooling tower fan frequency, the upper limit value of the cooling tower fan frequency, the instantaneous value of the approximate temperature difference and the approximate temperature difference setting value; executing the processing corresponding to the first risk level also includes: in the case where it is determined that the cooling pump has room for frequency upgrade, based on the instantaneous value of the cooling tower fan frequency and the upper limit value of the cooling tower fan frequency, judging whether the fan of the cooling tower has room for frequency upgrade; and in the case where it is determined that the cooling pump does not have room for frequency upgrade, judging whether the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference setting value.

[0008] In some embodiments, the parameters also include: a cooling pump frequency setting value; executing the processing corresponding to the first risk level also includes: when it is determined that the fan of the cooling tower has room for frequency upgrade, judging whether the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference setting value; when it is determined that the fan of the cooling tower has no room for frequency upgrade, increasing the cooling pump frequency setting value or lowering the cooling water supply and return water temperature difference setting value.

[0009] In some embodiments, the parameters also include: cooling pump schedulability, cooling tower schedulability and cooling tower fan frequency setting value; executing the processing corresponding to the first risk level also includes: for the case where there is room for frequency upgrade of the cooling pump and there is room for frequency upgrade of the cooling tower fan, if it is determined that the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference setting value, then determine whether the cooling pump schedulability is greater than or equal to the cooling tower schedulability, if so, then increase the cooling pump frequency setting value or lower the cooling water supply and return water temperature difference setting value, otherwise, adjust the cooling tower fan frequency setting value to the cooling tower fan frequency upper limit value or lower the approximate temperature difference setting value; for the case where there is room for frequency upgrade of the cooling pump and there is room for frequency upgrade of the cooling tower fan, if it is determined that the instantaneous value of the approximate temperature difference is less than or equal to the approximate temperature difference setting value, then increase the cooling pump frequency setting value or lower the cooling water supply and return water temperature difference setting value.

[0010] In some embodiments, the parameters also include: the number of cooling towers in operation, the instantaneous value of the chilled water outlet temperature and the set value of the chilled water outlet temperature; executing the processing corresponding to the first risk level also includes: for the case where there is no room for frequency upgrade of the cooling pump, if the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference set value, then based on the instantaneous value of the cooling tower fan frequency and the upper limit value of the cooling tower fan frequency, determine whether there is room for frequency upgrade of the cooling tower fan; if so, adjust the cooling tower fan frequency set value to the upper limit value of the cooling tower fan frequency or lower the approximate temperature difference set value; otherwise, determine whether there is room for increasing the number of cooling towers in operation; for the case where there is no room for frequency upgrade of the cooling pump, if the instantaneous value of the approximate temperature difference is less than or equal to the approximate temperature difference set value, determine whether the instantaneous value of the chilled water outlet temperature is greater than the set value of the chilled water outlet temperature.

[0011] In some embodiments, the parameters also include: the number of operating chillers; executing the processing corresponding to the first risk level also includes: when there is room to increase the number of operating cooling towers, judging whether there is room to increase the number of operating chillers; when there is no room to increase the number of operating cooling towers, judging whether the instantaneous value of the chilled water outlet temperature is greater than the set value of the chilled water outlet temperature.

[0012] In some embodiments, the parameters also include: the number of cooling towers that can be scheduled and the number of chillers that can be scheduled; executing the processing corresponding to the first risk level also includes: determining whether there is room for adding more chillers in operation; if so, determining whether the instantaneous value of the chilled water outlet temperature is greater than the chilled water outlet temperature setting value, otherwise, adding a first predetermined number of cooling towers for operation; when it is determined that the instantaneous value of the chilled water outlet temperature is greater than the chilled water outlet temperature setting value, determining whether the number of cooling towers that can be scheduled is greater than or equal to the number of chillers that can be scheduled; when it is determined that the instantaneous value of the chilled water outlet temperature is less than or equal to the chilled water outlet temperature setting value, determining whether the ratio of the number of operating cooling towers to the number of operating chillers is within a predetermined ratio range.

[0013] In some embodiments, executing the processing corresponding to the first risk level also includes: when the number of cooling towers that can be dispatched is greater than or equal to the number of chillers that can be dispatched, adding a first predetermined number of cooling towers to operate; when the number of cooling towers that can be dispatched is less than the number of chillers that can be dispatched, adding a second predetermined number of chillers to operate.

[0014] In some embodiments, the parameters also include: the number of operating chillers, the instantaneous value of the refrigeration pump frequency, the lower limit value of the refrigeration pump frequency, the setting value of the refrigeration pump frequency and the setting value of the chilled water supply and return water temperature difference; executing the processing corresponding to the first risk level also includes: when the instantaneous value of the chilled water outlet temperature is greater than the setting value of the chilled water outlet temperature, judging whether there is room for adding more chillers to the number of operating chillers, if so, adding a second predetermined number of operating chillers, otherwise, raising the setting value of the chilled water outlet temperature; when the instantaneous value of the chilled water outlet temperature is less than or equal to the setting value of the chilled water outlet temperature, judging whether there is room for frequency reduction of the refrigeration pump based on the instantaneous value of the refrigeration pump frequency and the lower limit value of the refrigeration pump frequency, if so, lowering the setting value of the refrigeration pump frequency or raising the setting value of the chilled water supply and return water temperature difference, otherwise, not adjusting the operating parameters of the air-conditioning system.

[0015] In some embodiments, executing the processing corresponding to the first risk level also includes: when the ratio of the number of operating cooling towers to the number of operating chillers is within a predetermined ratio range, adding a first predetermined number of cooling towers to the operation; when the ratio of the number of operating cooling towers to the number of operating chillers is outside the predetermined ratio range, based on the instantaneous value of the refrigeration pump frequency and the lower limit value of the refrigeration pump frequency, judging whether there is room for frequency reduction of the refrigeration pump; if so, lowering the refrigeration pump frequency setting value or increasing the chilled water supply and return water temperature difference setting value; otherwise, the operating parameters of the air-conditioning system are not adjusted.

[0016] In some embodiments, the number of cooling towers that can be scheduled D_nt is

[0017] ,

[0018] Among them, T_dai is the approximate instantaneous value of temperature difference, T_das is the approximate set value of temperature difference, T_dasu is the upper limit of the approximate set value of temperature difference, N_tm is the upper limit of the number of cooling towers, and N_to is the number of cooling towers in operation;

[0019] The number of chillers that can be dispatched D_nc is:

[0020] ,

[0021] Among them, Ti_cw is the instantaneous value of the chilled water outlet temperature, Ts_cw is the set value of the chilled water outlet temperature, Tus_cw is the upper limit of the set value of the chilled water outlet temperature, N_cm is the upper limit of the number of chillers, and N_co is the number of chillers in operation.

[0022] In some embodiments, the parameters also include: the instantaneous value of the cooling water supply and return water temperature difference, the cooling water supply and return water temperature difference setting value, the instantaneous value of the cooling pump frequency and the cooling pump frequency upper limit value; executing the processing corresponding to the second risk level includes: judging whether the instantaneous value of the cooling water supply and return water temperature difference is greater than the cooling water supply and return water temperature difference setting value; if so, judging whether there is room for the cooling pump to increase the frequency based on the instantaneous value of the cooling pump frequency and the upper limit value of the cooling pump frequency; otherwise, the operating parameters of the air-conditioning system are not adjusted.

[0023] In some embodiments, the parameters also include: the instantaneous value of the cooling tower fan frequency, the upper limit value of the cooling tower fan frequency, the instantaneous value of the approximate temperature difference and the approximate temperature difference setting value; executing the processing corresponding to the second risk level also includes: when it is determined that the cooling pump has room for frequency upgrade, based on the instantaneous value of the cooling tower fan frequency and the upper limit value of the cooling tower fan frequency, judging whether the fan of the cooling tower has room for frequency upgrade; when it is determined that the cooling pump does not have room for frequency upgrade, judging whether the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference setting value.

[0024] In some embodiments, the parameters also include: a cooling pump frequency setting value; executing the processing corresponding to the second risk level also includes: when it is determined that there is room for frequency upgrade of the fan of the cooling tower, judging whether the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference setting value; when it is determined that there is no room for frequency upgrade of the fan of the cooling tower, increasing the cooling pump frequency setting value or lowering the cooling water supply and return water temperature difference setting value.

[0025] In some embodiments, the parameters also include: cooling pump schedulability, cooling tower schedulability and cooling tower fan frequency setting value; executing the processing corresponding to the second risk level also includes: for the case where there is room for frequency upgrade of the cooling pump and there is room for frequency upgrade of the cooling tower fan, if it is determined that the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference setting value, then determine whether the cooling pump schedulability is greater than or equal to the cooling tower schedulability, if so, then increase the cooling pump frequency setting value or lower the cooling water supply and return water temperature difference setting value, otherwise, increase the cooling tower fan frequency setting value or lower the approximate temperature difference setting value; for the case where there is room for frequency upgrade of the cooling pump and there is room for frequency upgrade of the cooling tower fan, if it is determined that the instantaneous value of the approximate temperature difference is less than or equal to the approximate temperature difference setting value, then increase the cooling pump frequency setting value or lower the cooling water supply and return water temperature difference setting value.

[0026] In some embodiments, executing the processing corresponding to the second risk level also includes: for the case where there is no room for frequency upgrade of the cooling pump, if the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference setting value, then based on the instantaneous value of the cooling tower fan frequency and the upper limit value of the cooling tower fan frequency, determine whether there is room for frequency upgrade of the cooling tower fan; if so, increase the cooling tower fan frequency setting value or lower the approximate temperature difference setting value, otherwise, do not adjust the operating parameters of the air-conditioning system; for the case where there is no room for frequency upgrade of the cooling pump, if the instantaneous value of the approximate temperature difference is less than or equal to the approximate temperature difference setting value, do not adjust the operating parameters of the air-conditioning system.

[0027] In some embodiments, the cooling pump can schedule D_p to be

[0028] ,

[0029] Among them, Ti_dcsr is the instantaneous value of the cooling water supply and return water temperature difference, Ts_dcsr is the cooling water supply and return water temperature difference setting value, Tus_dcsr is the upper limit of the cooling water supply and return water temperature difference setting value, f_up is the upper limit of the cooling pump frequency, and f_ip is the instantaneous value of the cooling pump frequency;

[0030] The cooling tower can be dispatched D_t as

[0031] ,

[0032] Among them, T_dai is the approximate instantaneous value of temperature difference, T_das is the approximate set value of temperature difference, T_dasu is the upper limit value of the approximate set value of temperature difference, f_ut is the upper limit value of cooling tower fan frequency, and f_it is the instantaneous value of cooling tower frequency.

[0033] In some embodiments, the parameters also include: the instantaneous value of the cooling water supply and return temperature difference, the cooling water supply and return temperature difference setting value, the instantaneous value of the cooling pump frequency, the cooling pump frequency upper limit value, the cooling pump frequency setting value and the cooling water supply and return temperature difference setting value; executing the processing corresponding to the third risk level includes: judging whether the instantaneous value of the cooling water supply and return temperature difference is greater than the cooling water supply and return temperature difference setting value; when it is determined that the instantaneous value of the cooling water supply and return temperature difference is greater than the cooling water supply and return temperature difference setting value, based on the instantaneous value of the cooling pump frequency and the upper limit value of the cooling pump frequency, judging whether there is room for frequency increase of the cooling pump, if so, raising the cooling pump frequency setting value or lowering the cooling water supply and return temperature difference setting value, otherwise, not adjusting the operating parameters of the air-conditioning system; when it is determined that the instantaneous value of the cooling water supply and return temperature difference is less than or equal to the cooling water supply and return temperature difference setting value, not adjusting the operating parameters of the air-conditioning system.

[0034] In some embodiments, the control method further includes: when the condensing temperature is less than the fourth temperature threshold, not adjusting the operating parameters of the air-conditioning system; when the condensing temperature is greater than the first temperature threshold, controlling the air-conditioning system to shut down.

[0035] According to another aspect of the present disclosure, a control device for an air conditioning system is provided, comprising: a memory; and a processor coupled to the memory, wherein the processor is configured to execute the control method as described above based on instructions stored in the memory.

[0036] According to another aspect of the present disclosure, an air conditioning system is provided, comprising: the control device as described above.

[0037] According to another aspect of the present disclosure, a computer-readable storage medium is provided, on which computer instructions are stored. When the computer instructions are executed by a processor, the control method as described above is implemented.

[0038] According to another aspect of the present disclosure, a computer program product is provided. The computer program product includes a computer program or instructions. When the computer program or instructions are executed by a processor, the control method as described above is implemented.

[0039] In the above control method, the risk level of the air-conditioning system is determined based on the condensing temperature, the rate of change of the condensing temperature and the duration, and processing corresponding to the risk level is performed. In this way, the risks or failures that may occur in the air-conditioning system can be predicted, thereby facilitating risk reduction or failure avoidance.

[0040] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0042] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0043] Figure 1 is a block diagram schematically showing a structure of an air conditioning system according to some embodiments of the present disclosure;

[0044] Figure 2 is a flow chart showing a control method for an air conditioning system according to some embodiments of the present disclosure;

[0045] Figure 3 is a flow chart showing a control method for an air conditioning system according to other embodiments of the present disclosure;

[0046] Figure 4 is a flow chart showing a control method for an air conditioning system according to other embodiments of the present disclosure;

[0047] Figure 5 is a flow chart showing a control method for an air conditioning system according to other embodiments of the present disclosure;

[0048] Figure 6 is a flow chart showing a control method for an air conditioning system according to other embodiments of the present disclosure;

[0049] Figure 7 is a block diagram schematically showing a structure of a control device for an air conditioning system according to some embodiments of the present disclosure;

[0050] Figure 8 is a structural block diagram schematically showing a control device for an air-conditioning system according to some other embodiments of the present disclosure. DETAILED DESCRIPTION

[0051] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless otherwise specifically stated.

[0052] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0053] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0054] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0055] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0056] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0057] Figure 1 is a block diagram schematically illustrating a structure of an air conditioning system according to some embodiments of the present disclosure.

[0058] like Figure 1 As shown, the air conditioning system includes: a cooling tower 110, a cooling pump (also called a cooling water pump) 120, a chiller 130 and a freezing pump (also called a freezing water pump) 140. The air conditioning system may also include a terminal device 150. In addition, Figure 1 The outdoor environment is also shown.

[0059] As shown in FIG. 1 , the chiller 130 supplies cooling water to the cooling tower 110 via the cooling pump 120, and the cooling tower 110 returns cooling return water to the chiller 130 via the cooling pump 120. The cooling tower exchanges heat with the outdoor environment. The temperature of the cooling water supply is higher than the temperature of the cooling return water. The chiller 130 supplies chilled water to the terminal device 150 via the freezing pump 140, and the terminal device 150 returns chilled return water to the chiller 130 via the freezing pump 140. The terminal device exchanges heat with the indoor environment. The temperature of the chilled water supply is lower than the temperature of the chilled return water.

[0060] The cooling pump is used to drive the cooling water to circulate between the condenser and the cooling tower of the chiller, so that the heat in the condenser can be transferred to the cooling tower through the cooling water and dissipated in the cooling tower through heat exchange with the external environment.

[0061] Cooling water is used to remove heat from chillers or other equipment. It usually absorbs the heat generated by the equipment in the condenser of the chiller and is then transported to the cooling tower for heat dissipation. The cooling water circulates between the condenser and the cooling tower to dissipate heat and prevent the equipment from overheating.

[0062] Cooling towers are used to release heat from cooling water into the environment. The cooling tower uses heat exchange between air and water to cool the cooling water, and then sends the cooled water back to the condenser through a cooling pump to complete the heat dissipation cycle.

[0063] The refrigerant in the condenser will release a lot of heat during the cooling process. The cooling pump will transport the cooling water that has absorbed this heat to the cooling tower. In the cooling tower, the cooling water comes into contact with the air through spraying and other means, and uses the principles of evaporative heat dissipation and convection to dissipate heat into the air, so that the cooling water is cooled. The cooling pump then returns the cooled water to the condenser for the next cycle. In short, the cooling pump is responsible for the flow and circulation of water, and the cooling tower is responsible for cooling the water. Together, the two enable the condenser of the chiller to maintain a suitable temperature and ensure efficient operation of the system.

[0064] The refrigeration pump is used to drive the chilled water to circulate between the evaporator of the chiller and the terminal equipment of the building (such as fan coil units, air conditioning boxes), so that the chilled water can be returned to the chiller for cooling in time after absorbing the heat in the room or equipment.

[0065] Chilled water is water used to absorb heat from air conditioning or process equipment. It usually becomes colder after passing through the evaporator of the chiller. The chilled water will circulate to the end of the building or equipment (such as fan coil or air conditioning box), absorb heat and then return to the chiller for cooling. This part of water is mainly responsible for cooling the room or equipment.

[0066] The above-mentioned chillers include but are not limited to steam compression units, centrifugal units, screw units, scroll units and other units with high-pressure protection.

[0067] Figure 2 is a flow chart showing a control method for an air conditioning system according to some embodiments of the present disclosure. The air conditioning system includes a chiller. Figure 2 As shown, the control method includes steps S202 to S204.

[0068] In step S202, parameters of the air conditioning system are obtained, wherein the parameters include: a condensing temperature and a condensing temperature change rate of a condenser in a chiller.

[0069] For example, the condensing temperature can be obtained by collecting data feedback from the chiller itself.

[0070] For example, the condensation temperature change rate can be calculated by collecting the corresponding time and specific values ​​of the condensation temperature. ΔTn can be used to represent the difference in condensation temperature over a period of time. For example, at 7:24, the condensation temperature is 38.3°C, and at 7:39, the condensation temperature is 40.3°C. Then ΔTn represents the difference (change) of condensation temperature between 7:24 and 7:39, which is 2°C. Δd can be used to represent the time difference of a period. For example, the time difference (change) of the above 7:24-7:39 period is 15 minutes. Therefore, ΔTn / Δd can be used to represent the condensation temperature change rate.

[0071] In step S204, when the condensing temperature is within a predetermined risk level temperature range, the condensing temperature change rate is greater than zero, and the duration meets a predetermined duration, the risk level of the air conditioning system is determined, and processing corresponding to the risk level is performed.

[0072] Here, multiple (for example, three) risk level temperature ranges can be set to determine which risk level temperature range the above condensing temperature is in. The condensing temperature change rate is greater than zero, indicating that the condensing temperature has a tendency to increase. Since some parameters are instantaneous values ​​(for example, condensing temperature), in order to reduce the impact of sudden changes and fluctuations in data on judgment, a time scale is introduced, that is, to judge whether the duration meets the predetermined duration. If the duration meets the predetermined duration, it can be confirmed that the condensing temperature of the chiller does have a trend of continuous increase, rather than data fluctuations, which can improve the accuracy of system judgment and control.

[0073] The above-mentioned duration is the duration during which the condensing temperature is within the predetermined risk level temperature range and the condensing temperature change rate is greater than zero.

[0074] For example, the range of the predetermined time length may be 5 minutes to 7 minutes, which can reduce the impact of sudden changes and fluctuations in data on the judgment, thereby further confirming that the condensing temperature of the chiller does have a trend of continuous increase. It should be noted that the above-mentioned range of the predetermined time length is only exemplary, and the scope of the present disclosure is not limited to the specific value of the predetermined time length, and the predetermined time length can be set according to actual needs.

[0075] So far, a control method for an air conditioning system according to some embodiments of the present disclosure is provided. The control method includes: obtaining parameters of the air conditioning system, wherein the parameters include: the condensing temperature and the condensing temperature change rate of the condenser in the chiller; and when the condensing temperature is within a predetermined risk level temperature range, the condensing temperature change rate is greater than zero, and the duration meets the predetermined duration, determining the risk level of the air conditioning system, and performing processing corresponding to the risk level. In this embodiment, the risk level of the air conditioning system is determined based on the condensing temperature, the condensing temperature change rate and the duration, and performing processing corresponding to the risk level, so that the risks or faults that may occur in the air conditioning system can be predicted, thereby facilitating risk reduction or fault avoidance. Furthermore, by determining that the duration meets the predetermined duration, it can be confirmed that the condensing temperature of the chiller does have a trend of continuous increase, rather than data fluctuations, which can improve the accuracy of system judgment and control.

[0076] In some embodiments, the above step S204 includes: when the condensing temperature is less than or equal to the first temperature threshold and greater than or equal to the second temperature threshold, the condensing temperature change rate is greater than zero, and the duration (that is, the condensing temperature is less than or equal to the first temperature threshold and greater than or equal to the second temperature threshold and the condensing temperature change rate is greater than zero) reaches a first predetermined duration, determining that the air conditioning system is at a first risk level and performing processing corresponding to the first risk level; when the condensing temperature is less than the second temperature threshold and greater than or equal to the third temperature threshold, the condensing temperature change rate is greater than zero, and the duration (that is, the condensing temperature is less than the second temperature threshold and greater than or equal to the third temperature threshold, the condensing temperature change rate is greater than zero, and the duration (that is, the condensing temperature is less than the second When the condensing temperature is less than the third temperature threshold and greater than or equal to the fourth temperature threshold, the condensing temperature change rate is greater than zero, and the duration (that is, the condensing temperature is less than the third temperature threshold and greater than or equal to the fourth temperature threshold and the condensing temperature change rate is greater than zero) reaches the second predetermined time, the air-conditioning system is determined to be at the second risk level, and the processing corresponding to the second risk level is performed; and when the condensing temperature is less than the third temperature threshold and greater than or equal to the fourth temperature threshold, the condensing temperature change rate is greater than zero, and the duration (that is, the condensing temperature is less than the third temperature threshold and greater than or equal to the fourth temperature threshold and the condensing temperature change rate is greater than zero) reaches the third predetermined time, the air-conditioning system is determined to be at the third risk level, and the processing corresponding to the third risk level is performed.

[0077] For example, the first risk level is higher than the second risk level, and the second risk level is higher than the third risk level.

[0078] In the above embodiment, the risk level temperature range mentioned above may include three risk level temperature ranges, namely, [Tnc, Tnb), [Tnb, Tnx) and [Tnx, Tnt], wherein Tnt is the first temperature threshold, Tnx is the second temperature threshold, Tnb is the third temperature threshold, and Tnc is the fourth temperature threshold. In this way, by determining the risk level temperature range in which the condensing temperature is located, and the condensing temperature change rate is greater than zero, and the duration reaches a predetermined duration, the risk level of the air-conditioning system can be determined, and the processing corresponding to the risk level can be performed. In this way, the risk level of the air-conditioning system is refined, so that the risks or faults that may occur in the air-conditioning system can be more precisely predicted, thereby reducing risks or avoiding faults more accurately and conveniently.

[0079] For example, Tnc=Tnb-x, where x is a preset value. For example, 0.5≤x≤1. Of course, the scope of the present disclosure is not limited to a specific value of x.

[0080] It should also be noted that the fourth temperature threshold may also be calculated using other calculation methods or other values, and is not limited to the above calculation method.

[0081] Figure 3 FIG. 1 is a flow chart showing a control method for an air conditioning system according to other embodiments of the present disclosure. Figure 3As shown, the control method includes step S301.

[0082] In step S301, parameters of the control system are obtained.

[0083] For example, the parameters include: a condensing temperature Tn and a condensing temperature change rate ΔTn / Δd of a condenser in a chiller.

[0084] For another example, the above parameters may also include: cooling water supply and return water temperature difference set value, cooling water supply and return water temperature difference instantaneous value, chilled water outlet temperature set value, chilled water outlet temperature instantaneous value, chilled water supply and return water temperature difference set value, cooling pump frequency instantaneous value, cooling pump frequency upper limit value, freezing pump frequency instantaneous value, freezing pump frequency lower limit value, cooling tower fan frequency instantaneous value, cooling tower fan frequency set value, cooling tower fan frequency upper limit value, chiller number upper limit value, chiller number in operation, cooling tower number upper limit value, cooling tower number in operation, approaching temperature difference instantaneous value, approaching temperature difference set value, etc. Among these parameters, some parameters can be measured by temperature sensors, and some parameters can be obtained by reading controllers. These parameters will be described in detail later.

[0085] It should be noted that the "instantaneous value" mentioned in the present disclosure refers to the instantaneous value collected after real-time monitoring of a certain device (such as a chiller) begins. For example, the time interval may be 1 minute, that is, one data is collected every 1 minute.

[0086] Here, the instantaneous value collected is the actual value, and the instantaneous value is collected in order to carry out real-time monitoring of the operating status of the chiller. When the condensing temperature gradually increases and has a trend of continuing to rise, it indicates that the operating condition of the chiller has the risk of continuing to deteriorate. Therefore, corresponding measures should be taken for the chiller to reduce or avoid the corresponding risks as much as possible. The collection of the above-mentioned instantaneous values ​​of the cooling water supply and return water temperature difference, the instantaneous value of the chilled water outlet temperature, the instantaneous value of the cooling pump frequency, the instantaneous value of the freezing pump frequency, the instantaneous value of the cooling tower fan frequency, etc. is to find the best and feasible solution, and use this solution to carry out corresponding measures on the chiller to reduce the risk.

[0087] In some embodiments, control limit parameters may also be read, including: a first temperature threshold (also referred to as a high-pressure protection temperature limit) Tnt, a second temperature threshold (also referred to as a high-pressure unloading temperature limit) Tnx, a third temperature threshold (also referred to as a high-pressure holding temperature limit) Tnb, etc. The "high pressure" here refers to the condensing side pressure of the chiller, that is, the high-pressure side pressure formed after the refrigerant gas discharged from the compressor exchanges heat with the cooling water in the condenser.

[0088] In step S302, it is determined whether Tnx≤Tn≤Tnt and ΔTn / Δd>0 are satisfied. If so, the process proceeds to step S303; otherwise, the process proceeds to step S305.

[0089] In step S303, the duration Δµ is satisfied, that is, the predetermined duration mentioned above is satisfied.

[0090] In step S304, it is determined that the air conditioning system is at a first risk level, and a process corresponding to the first risk level is performed.

[0091] That is, when Tnx≤Tn≤Tnt and ΔTn / Δd>0, the duration Δµ is satisfied, indicating that the condensing temperature of the chiller has exceeded the high-pressure unloading temperature limit Tnx and has a trend of continuing to rise, then the processing corresponding to the first risk level is executed.

[0092] In step S305, it is determined whether Tnb≤Tn<Tnx and ΔTn / Δd>0 are satisfied. If so, the process proceeds to step S306; otherwise, the process proceeds to step S308.

[0093] In step S306, the duration Δµ is satisfied, that is, the predetermined duration mentioned above is satisfied.

[0094] In step S307, it is determined that the air conditioning system is at a second risk level, and a process corresponding to the second risk level is performed.

[0095] That is, when Tnb≤Tn<Tnx and ΔTn / Δd>0, the duration Δµ is satisfied, indicating that the condensing temperature of the chiller has exceeded the high-pressure holding temperature limit Tnb and has a trend of continuing to rise, then the processing corresponding to the second risk level is executed.

[0096] In step S308, it is determined whether Tnb-x≤Tn<Tnb and ΔTn / Δd>0 are satisfied. If so, the process proceeds to step S309; ​​otherwise, the process proceeds to step S310. Here, Tnb-x is the fourth temperature threshold. For example, x is 1.

[0097] In step S309, the duration Δµ is satisfied, that is, the predetermined duration mentioned above is satisfied.

[0098] In step S310, it is determined that the air conditioning system is at a third risk level, and a process corresponding to the third risk level is performed.

[0099] That is, when Tnb-1≤Tn<Tnb and ΔTn / Δd>0, the duration Δµ is satisfied, indicating that the condensing temperature of the chiller is close to the high-pressure holding temperature limit Tnb and has a trend of continuing to rise, then the processing corresponding to the third risk level is executed.

[0100] In step S311, there is no need to adjust the operating parameters.

[0101] So far, a control method for an air conditioning system according to other embodiments of the present disclosure is provided. By determining the risk level temperature range of the condensing temperature, and the condensing temperature change rate is greater than zero, and the duration reaches a predetermined duration, the risk level of the air conditioning system can be determined, and the processing corresponding to the risk level can be performed. In this way, the risk level of the air conditioning system is refined, so that the risks or failures that may occur in the air conditioning system can be more precisely predicted, so as to more accurately and conveniently reduce risks or avoid failures.

[0102] In some embodiments, the control method further includes: when the condensing temperature is less than the fourth temperature threshold, the operating parameters of the air conditioning system are not adjusted; when the condensing temperature is greater than the first temperature threshold, the air conditioning system is controlled to shut down. In this embodiment, if the condensing temperature is less than the fourth temperature threshold, it indicates that the pressure control on the high-pressure side of the chiller is normal and there is no need to adjust the equipment operating parameters; if the condensing temperature is greater than the first temperature threshold, it indicates that the condensing temperature is high, and the air conditioning system is controlled to shut down. In this way, the control of the air conditioning system is achieved, so that when the condensing temperature is low, the air conditioning operation is not affected, and when the condensing temperature is too high, the air conditioning system is protected by shutting down.

[0103] In some embodiments, the above parameters also include: an instantaneous value of the cooling water supply and return water temperature difference, a set value of the cooling water supply and return water temperature difference, an instantaneous value of the cooling pump frequency, and an upper limit value of the cooling pump frequency.

[0104] For example, the instantaneous value of the cooling water supply temperature and the instantaneous value of the cooling water return temperature can be collected through the temperature sensor, and the difference between the instantaneous value of the cooling water supply temperature and the instantaneous value of the cooling water return temperature can be calculated to obtain the instantaneous value of the cooling water supply and return temperature difference. The cooling water supply and return temperature difference setting value, the instantaneous value of the cooling pump frequency, and the upper limit value of the cooling pump frequency can be obtained from the controller of the air conditioning system through data collection.

[0105] On this basis, the processing corresponding to the first risk level includes: judging whether the instantaneous value of the cooling water supply and return water temperature difference is greater than the cooling water supply and return water temperature difference setting value; if so, judging whether there is room for the cooling pump to increase the frequency based on the instantaneous value of the cooling pump frequency and the upper limit value of the cooling pump frequency; otherwise, the operating parameters of the air-conditioning system are not adjusted.

[0106] For example, if the instantaneous value of the cooling pump frequency is less than the upper limit of the cooling pump frequency, it is determined that there is room for frequency upgrade of the cooling pump; if the instantaneous value of the cooling pump frequency is greater than or equal to the upper limit of the cooling pump frequency, it is determined that there is no room for frequency upgrade of the cooling pump.

[0107] In the above embodiment, the relative relationship between the instantaneous value of the cooling water supply and return temperature difference and the set value of the cooling water supply and return temperature difference is determined. When the instantaneous value of the cooling water supply and return temperature difference is less than or equal to the set value of the cooling water supply and return temperature difference, it indicates that the cooling tower and the cooling pump have completed their respective work well within their respective capabilities (here, the cooling pump is responsible for the flow and circulation of water, and the cooling tower is responsible for cooling the water). The effect of subsequent frequency increase of the cooling pump or the cooling tower fan may not be large, but the condensing temperature may still not be maintained in a suitable temperature range. This may be due to the outdoor meteorological conditions being too bad or other reasons, resulting in exceeding the range of the ability to intervene in the system through the control parameters, so the operating parameters of the air conditioning system are not adjusted. On the contrary, when the instantaneous value of the cooling water supply and return temperature difference is greater than the set value of the cooling water supply and return temperature difference, it indicates that at least one of the cooling tower and the cooling water pump has room for improvement within their respective capabilities, and subsequent judgment is performed. In this way, a more precise prejudgment of the risks or failures that may occur in the air conditioning system is made, thereby more accurately and conveniently reducing risks or avoiding failures.

[0108] In some embodiments, the above parameters also include: an instantaneous value of a cooling tower fan frequency, an upper limit value of a cooling tower fan frequency, an instantaneous value of an approaching temperature difference, and an approaching temperature difference set value.

[0109] For example, the instantaneous value of the cooling tower fan frequency, the upper limit value of the cooling tower fan frequency and the approximate temperature difference set value can be obtained from the controller of the air-conditioning system through data collection, and the approximate temperature difference instantaneous value can be obtained through a temperature sensor or from the controller of the air-conditioning system through data collection and calculation.

[0110] Here, the approximate temperature difference is the difference between the cooling tower outlet water temperature and the wet bulb temperature. That is, the approximate temperature difference = cooling tower outlet water temperature - wet bulb temperature.

[0111] Among them, the wet-bulb temperature refers to the air temperature when the water vapor in the air reaches saturation under the air state of the same enthalpy value. On the air enthalpy humidity diagram, it is the dry-bulb temperature of the corresponding point from the air state point along the isoenthalpy line to the 100% relative humidity line. In simple terms, the wet-bulb temperature can be expressed as the lowest temperature that water can reach through evaporation at a certain place and time.

[0112] The cooling water removes the heat discharged by the condenser through heat exchange, and the cooling tower removes the heat of the cooling water through heat exchange. The cooling water can only be cooled to the wet bulb temperature at most under the action of the cooling tower. However, the actual cooling tower outlet water temperature is usually not equal to or lower than the wet bulb temperature. The closer the water temperature is to the wet bulb temperature, the larger the cooling tower needs to be, which is neither economical nor realistic; therefore, the actual cooling tower outlet water temperature will be higher than the wet bulb temperature, and the difference between the cooling tower outlet water temperature and the wet bulb temperature is the approximate temperature difference, for example, the approximation degree is 2℃ to 3℃.

[0113] On this basis, executing the processing corresponding to the first risk level also includes: when it is determined that the cooling pump has room for frequency upgrade, judging whether the cooling tower fan has room for frequency upgrade based on the instantaneous value of the cooling tower fan frequency and the upper limit value of the cooling tower fan frequency; and when it is determined that the cooling pump does not have room for frequency upgrade, judging whether the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference set value.

[0114] For example, if the instantaneous value of the cooling tower fan frequency is less than the upper limit value of the cooling tower fan frequency, it is determined that the cooling tower fan has room for frequency increase; if the instantaneous value of the cooling tower fan frequency is greater than or equal to the upper limit value of the cooling tower fan frequency, it is determined that the cooling tower fan has no room for frequency increase.

[0115] As mentioned above, when the instantaneous value of the cooling water supply and return water temperature difference is greater than the cooling water supply and return water temperature difference set value, it indicates that at least one of the cooling tower and the cooling pump has room for improvement within their respective capabilities. Therefore, in the above embodiment, when it is determined that the cooling pump has room for frequency upgrade, it is judged whether the cooling tower fan has room for frequency upgrade. When it is determined that the cooling pump does not have room for frequency upgrade, it is judged whether the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference set value. In this way, the system can be processed under different conditions of the cooling pump, thereby making a more precise prediction of possible risks or failures of the air-conditioning system, thereby more accurately and conveniently reducing risks or avoiding failures.

[0116] In some embodiments, the above parameters further include: a cooling pump frequency setting value. The cooling pump frequency setting value can be obtained from a controller of the air conditioning system through data acquisition.

[0117] On this basis, executing the processing corresponding to the first risk level also includes: when it is determined that there is room for frequency upgrade of the cooling tower fan, judging whether the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference setting value; when it is determined that there is no room for frequency upgrade of the cooling tower fan, increasing the cooling pump frequency setting value or lowering the cooling water supply and return water temperature difference setting value.

[0118] In the above embodiment, if there is room for frequency upgrade of the cooling tower fan, subsequent processing is performed based on the approximate instantaneous value of the temperature difference and the approximate temperature difference setting value. If there is no room for frequency upgrade of the cooling tower fan, it means that based on the current number of cooling towers in operation, the cooling tower cannot improve its heat dissipation capacity. However, if the heat of the cooling water cannot be discharged in time, the condensation temperature cannot be effectively improved. Therefore, increasing the cooling water pump frequency setting value or lowering the cooling water supply and return water temperature difference setting value can increase the cooling water flow rate. In this way, the heat of the cooling water that can be taken away per unit time also increases accordingly, thereby improving the cooling capacity of the air-conditioning system.

[0119] In some embodiments, the above parameters also include: cooling pump schedulability, cooling tower schedulability and cooling tower fan frequency setting value.

[0120] For example, the cooling pump can be scheduled D_p as

[0121]

[0122] Among them, Ti_dcsr is the instantaneous value of the cooling water supply and return temperature difference, Ts_dcsr is the cooling water supply and return temperature difference setting value, Tus_dcsr is the upper limit of the cooling water supply and return temperature difference setting value, f_up is the upper limit of the cooling pump frequency, and f_ip is the instantaneous value of the cooling pump frequency. These parameters can be obtained from the controller of the air-conditioning system through data acquisition or through sensor acquisition and calculation, and then the cooling pump can be calculated.

[0123] For example, the cooling tower can be scheduled D_t as

[0124] , (2)

[0125] Among them, T_dai is the approximate instantaneous value of temperature difference, T_das is the approximate set value of temperature difference, T_dasu is the upper limit of the approximate set value of temperature difference, f_ut is the upper limit of cooling tower fan frequency, and f_it is the instantaneous value of cooling tower frequency. These parameters can be obtained from the controller of the air conditioning system through data collection or through sensor collection and calculation, and then the cooling tower can be calculated.

[0126] Here, the physical meaning of the cooling pump being schedulable and the cooling tower being schedulable can be understood as follows: when the instantaneous value of the approximate temperature difference is greater than the set value of the approximate temperature difference, it indicates that the cooling pump and the cooling tower both have room for improvement within their respective capabilities. At this time, the control parameters need to determine which parameter will bring greater benefits. Therefore, by determining whether the cooling pump is schedulable or the cooling tower is schedulable, the choice that brings greater benefits can be made, thereby regulating the air conditioning system for maximum benefits.

[0127] On this basis, executing the processing corresponding to the first risk level also includes: for the case where there is room for frequency upgrade of the cooling pump and the fan of the cooling tower, if it is determined that the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference setting value, then determine whether the cooling pump can be dispatched greater than or equal to the cooling tower can be dispatched, if so, increase the cooling pump frequency setting value or lower the cooling water supply and return water temperature difference setting value, otherwise, adjust the cooling tower fan frequency setting value to the cooling tower fan frequency upper limit value or lower the approximate temperature difference setting value; for the case where there is room for frequency upgrade of the cooling pump and the fan of the cooling tower, if it is determined that the instantaneous value of the approximate temperature difference is less than or equal to the approximate temperature difference setting value, then increase the cooling pump frequency setting value or lower the cooling water supply and return water temperature difference setting value.

[0128] In the above embodiment, when the instantaneous value of the approximate temperature difference is greater than the set value of the approximate temperature difference, it indicates that the cooling pump and the cooling tower both have room for improvement within their respective capabilities. At this time, the control parameters need to determine which parameter can be adjusted to bring greater benefits. Therefore, by judging whether the cooling pump is schedulable or the cooling tower is schedulable, a choice that brings greater benefits can be made, thereby regulating the air-conditioning system for maximum benefits. When there is room for frequency increase for both the cooling water pump and the cooling tower fan, if the instantaneous value of the approximate temperature difference is less than or equal to the set value of the approximate temperature difference, it indicates that the cooling tower has completed the corresponding task well (for example, reducing the cooling tower outlet water temperature), so the cooling pump can still have room for improvement within its capabilities. Therefore, the cooling pump frequency setting value is increased or the cooling water supply and return water temperature setting value is reduced, thereby achieving more accurate regulation of the air-conditioning system.

[0129] In some embodiments, the above parameters also include: the number of cooling towers in operation, the instantaneous value of the chilled water outlet temperature, and the set value of the chilled water outlet temperature. For example, the number of cooling towers in operation and the set value of the chilled water outlet temperature can be obtained from the controller of the air conditioning system through data collection, and the instantaneous value of the chilled water outlet temperature can be obtained through a temperature sensor or from the controller of the air conditioning system through data collection.

[0130] On this basis, executing the processing corresponding to the first risk level also includes: for the case where there is no room for frequency upgrade of the cooling pump, if the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference setting value, then based on the instantaneous value of the cooling tower fan frequency and the upper limit value of the cooling tower fan frequency, determine whether there is room for frequency upgrade of the cooling tower fan; if so, adjust the cooling tower fan frequency setting value to the upper limit value of the cooling tower fan frequency or lower the approximate temperature difference setting value; otherwise, determine whether there is room for increasing the number of cooling tower operating units; for the case where there is no room for frequency upgrade of the cooling pump, if the instantaneous value of the approximate temperature difference is less than or equal to the approximate temperature difference setting value, determine whether the instantaneous value of the chilled water outlet temperature is greater than the chilled water outlet temperature setting value.

[0131] In the above embodiment, when there is no room for frequency increase in the cooling water pump, it indicates that there is no room for the cooling water pump to increase. Therefore, the relative relationship between the approximate temperature difference instantaneous value and the approximate temperature difference setting value is determined. When the approximate temperature difference instantaneous value is greater than the approximate temperature difference setting value, it indicates that the cooling tower still has room for increase within the capacity range, because it has not yet achieved the pre-set value target, thereby determining whether there is room for frequency increase in the cooling tower fan. If there is room for frequency increase, then on the basis that there is no room for the cooling water pump to increase, the cooling tower fan frequency setting value is adjusted to the cooling tower fan frequency upper limit or the approximate temperature difference setting value is lowered; when the approximate temperature difference instantaneous value is less than or equal to the approximate temperature difference setting value, the instantaneous value of the chilled water outlet temperature is compared with the chilled water outlet temperature setting value. In this way, the parameters of the air-conditioning system can be flexibly adjusted, and the refrigeration capacity of the air-conditioning system can also be improved.

[0132] In some embodiments, the above parameters also include the number of chillers in operation. For example, the number of chillers in operation can be obtained from a controller of the air conditioning system through data collection.

[0133] On this basis, executing the processing corresponding to the first risk level also includes: judging whether there is room for increasing the number of cooling towers in operation. For example, if the number of cooling towers in operation is less than the upper limit of the number of cooling towers, it is determined that there is room for increasing the number of cooling towers in operation; if the number of cooling towers in operation is greater than or equal to the upper limit of the number of cooling towers, it is determined that there is no room for increasing the number of cooling towers in operation.

[0134] Furthermore, executing the processing corresponding to the first risk level also includes: when there is room to increase the number of operating cooling towers, judging whether there is room to increase the number of operating chillers; when there is no room to increase the number of operating cooling towers, judging whether the instantaneous value of the chilled water outlet temperature is greater than the set value of the chilled water outlet temperature.

[0135] In the above embodiment, when there is no room for frequency upgrade of the cooling water pump, the instantaneous value of the approaching temperature difference is greater than the approaching temperature difference setting value and there is no room for frequency upgrade of the cooling tower fan, it indicates that there is no room for improvement of the cooling water pump and the number of cooling towers currently in operation cannot meet the cooling demand of the cooling water. Therefore, it is necessary to judge whether there is room for increasing the number of operating cooling towers and whether there is room for increasing the number of operating chillers, and then perform corresponding processing based on the judgment results to minimize risks or avoid failures.

[0136] In some embodiments, the above parameters also include: the number of cooling towers that can be scheduled and the number of chillers that can be scheduled.

[0137] For example, the number of cooling towers that can be dispatched D_nt is

[0138] , (3)

[0139] Among them, T_dai is the approximate instantaneous value of temperature difference, T_das is the approximate set value of temperature difference, T_dasu is the upper limit of the approximate set value of temperature difference, N_tm is the upper limit of the number of cooling towers, and N_to is the number of cooling towers in operation. These parameters can be obtained from the controller of the air-conditioning system through data acquisition or through sensor acquisition and calculation, so as to obtain the number of cooling towers that can be dispatched through the above calculation relationship (3).

[0140] For example, the number of chillers that can be dispatched D_nc is

[0141] , (4)

[0142] Among them, Ti_cw is the instantaneous value of the chilled water outlet temperature, Ts_cw is the chilled water outlet temperature set value, Tus_cw is the upper limit of the chilled water outlet temperature set value, N_cm is the upper limit of the number of chillers, and N_co is the number of chillers in operation. These parameters can be obtained from the controller of the air-conditioning system through data acquisition or through sensor acquisition and calculation, so as to obtain the dispatchable number of chillers through the above calculation relationship (4).

[0143] Here, the physical meaning of the adjustable number of cooling towers and chillers can be understood as follows: when the instantaneous value of the chilled water outlet temperature is greater than the set value of the chilled water outlet temperature, it indicates that the number of cooling towers and chillers has room for improvement within their respective capabilities. At this time, the control parameters need to determine which parameter can bring greater benefits. Therefore, by determining whether the number of cooling towers and chillers can be adjusted, the choice that brings greater benefits can be made, thereby adjusting the air conditioning system to achieve the maximum benefit.

[0144] On this basis, executing the processing corresponding to the first risk level also includes: determining whether there is room for adding more chillers to the number of operating chillers; if so, determining whether the instantaneous value of the chilled water outlet temperature is greater than the set value of the chilled water outlet temperature, otherwise, increasing the number of cooling towers to be operated by a first predetermined number; when it is determined that the instantaneous value of the chilled water outlet temperature is greater than the set value of the chilled water outlet temperature, determining whether the number of cooling towers that can be dispatched is greater than or equal to the number of chillers that can be dispatched; when it is determined that the instantaneous value of the chilled water outlet temperature is less than or equal to the set value of the chilled water outlet temperature, determining whether the ratio of the number of operating cooling towers to the number of operating chillers is within a predetermined ratio range.

[0145] In the above embodiment, judgment is made based on the number of operating chillers, the instantaneous value of the chilled water outlet temperature, the number of schedulable cooling towers, the number of schedulable chillers, and the ratio of the number of operating cooling towers to the number of operating chillers, so that the air-conditioning system can be regulated to maximize the benefit.

[0146] When there is space for adding more cooling towers but no space for adding more chillers, a first predetermined number of cooling towers are added for operation, thereby improving the cooling towers' ability to cool cooling water.

[0147] For example, the first predetermined number may be 1. Of course, the present disclosure is not limited to a specific value of the first predetermined number, and the first predetermined number may be set according to actual needs.

[0148] In some embodiments, executing processing corresponding to the first risk level also includes: when the number of cooling towers that can be dispatched is greater than or equal to the number of chillers that can be dispatched, adding a first predetermined number of cooling towers to operate; when the number of cooling towers that can be dispatched is less than the number of chillers that can be dispatched, adding a second predetermined number of chillers to operate.

[0149] As mentioned above, when the number of cooling towers and chillers are both within their respective capabilities and have room for improvement, the control parameters need to determine which parameter can bring greater benefits. Therefore, by determining the number of cooling towers that can be adjusted and the number of chillers that can be adjusted, the choice that brings greater benefits can be made, thereby adjusting the air conditioning system to maximize benefits.

[0150] For example, the second predetermined number may be 1. Of course, the present disclosure is not limited to a specific value of the second predetermined number, and the second predetermined number may be set according to actual needs.

[0151] In some embodiments, the above parameters also include: the number of chillers in operation, the instantaneous value of the refrigeration pump frequency, the lower limit of the refrigeration pump frequency, the refrigeration pump frequency setting value, and the refrigeration water supply and return water temperature difference setting value. For example, these parameters can be obtained from the controller of the air conditioning system through data acquisition and other methods.

[0152] On this basis, executing the processing corresponding to the first risk level also includes: when the instantaneous value of the chilled water outlet temperature is greater than the set value of the chilled water outlet temperature, judging whether there is room for adding more chillers to the number of operating chillers; if so, increasing the second predetermined number of operating chillers; otherwise, raising the set value of the chilled water outlet temperature; when the instantaneous value of the chilled water outlet temperature is less than or equal to the set value of the chilled water outlet temperature, judging whether there is room for reducing the frequency of the chilled pump based on the instantaneous value of the chilled water pump frequency and the lower limit value of the chilled water pump frequency; if so, lowering the set value of the chilled water pump frequency or raising the set value of the chilled water supply and return water temperature difference; otherwise, the operating parameters of the air-conditioning system are not adjusted.

[0153] For example, if the instantaneous value of the refrigeration pump frequency is greater than the lower limit value of the refrigeration pump frequency, it is determined that there is room for frequency reduction of the refrigeration pump; if the instantaneous value of the refrigeration pump frequency is less than or equal to the lower limit value of the refrigeration pump frequency, it is determined that there is no room for frequency reduction of the refrigeration pump.

[0154] In the above embodiment, the relative relationship between the instantaneous value of the chilled water outlet temperature and the set value of the chilled water outlet temperature is determined. When the instantaneous value of the chilled water outlet temperature is greater than the set value of the chilled water outlet temperature, if there is room for adding more chillers in operation, the number of chillers in operation is increased, otherwise, the set value of the chilled water outlet temperature is increased. When the instantaneous value of the chilled water outlet temperature is less than or equal to the set value of the chilled water outlet temperature, it indicates that the chiller has completed the set target value within its capacity. At this time, increasing the number of running chillers may not necessarily have better benefits, that is, the condensing temperature of the chiller whose current condensing temperature continues to rise will not be improved. Therefore, it is determined whether there is room for frequency reduction of the chilled water pump. When there is room for frequency reduction of the chilled water pump, the frequency set value of the chilled water pump is reduced or the set value of the chilled water supply and return water temperature difference is increased, thereby reducing the burden on the currently running chilled water unit.

[0155] In some embodiments, executing the processing corresponding to the first risk level also includes: when the ratio of the number of operating cooling towers to the number of operating chillers is within a predetermined ratio range, adding a first predetermined number of cooling towers to the operation; when the ratio of the number of operating cooling towers to the number of operating chillers is outside the predetermined ratio range, based on the instantaneous value of the refrigeration pump frequency and the lower limit value of the refrigeration pump frequency, judging whether there is room for frequency reduction of the refrigeration pump; if so, lowering the refrigeration pump frequency setting value or increasing the chilled water supply and return water temperature difference setting value; otherwise, the operating parameters of the air-conditioning system are not adjusted.

[0156] Here, the ratio of the number of cooling towers in operation to the number of chillers in operation can be used to describe the ratio of cooling towers to chillers in an air conditioning system or chiller system, specifically indicating the following meanings:

[0157] (A) The matching operation status of cooling towers and chillers: This ratio reflects how many cooling towers and chillers are currently running in the system. For example, if the ratio is 2 / 1, it means that there are currently two cooling towers serving one chiller. Through this ratio, we can understand the relative load distribution of cooling towers and chillers.

[0158] (B) Adjustment of system cooling capacity: The number of cooling towers in operation has a direct impact on the operating efficiency and condensing pressure of the chiller. More cooling towers in operation can provide greater heat dissipation capacity, help reduce the condensing temperature and condensing pressure of the chiller, and improve the efficiency of the unit. Therefore, adjusting this ratio helps optimize the operating performance of the system.

[0159] In the above embodiment, when there is room for adding more cooling towers and there is room for adding more chillers, but the instantaneous value of the chilled water outlet temperature is less than or equal to the chilled water outlet temperature setting value, it indicates that the chiller has achieved the set target value, i.e., the "chilled water outlet temperature setting value", so it can be judged later whether increasing the number of cooling towers in operation will have a better benefit. Therefore, when the ratio of the number of cooling towers in operation to the number of chillers in operation is within the predetermined ratio range, increasing the number of cooling towers in operation by the first predetermined number can obtain a good benefit. When the ratio of the number of cooling towers in operation to the number of chillers in operation is outside the predetermined ratio range, if there is room for frequency reduction in the refrigeration pump, the frequency setting value of the refrigeration pump is reduced or the supply and return temperature difference setting value of the chilled water is increased, thereby reducing the burden on the currently operating chiller.

[0160] Figure 4 is a flow chart showing a control method for an air conditioning system according to other embodiments of the present disclosure. Figure 4 The control method shown describes the process of performing the processing corresponding to the first risk level. Figure 4As shown, the control method includes steps S401 to S427.

[0161] In step S401, it is determined whether the instantaneous value of the cooling water supply and return water temperature difference is greater than the cooling water supply and return water temperature difference setting value. If yes, the process proceeds to step S402; otherwise, the process proceeds to step S403, that is, the equipment dispatchability does not meet the requirements, and the equipment operating parameters are not adjusted.

[0162] In step S402, it is determined whether the cooling pump has room for frequency increase. For example, the instantaneous value of the cooling pump frequency and the upper limit value of the cooling pump frequency can be evaluated to determine whether the cooling pump has room for frequency increase. If yes, the process proceeds to step S404, otherwise, the process proceeds to step S410.

[0163] In step S403, the operating parameters are not adjusted.

[0164] In step 404, it is determined whether the cooling tower fan has room for frequency increase. For example, the instantaneous value of the cooling tower fan frequency and the upper limit value of the cooling tower fan frequency are evaluated to determine whether the cooling tower fan has room for frequency increase. If yes, the process proceeds to step S405, otherwise, the process proceeds to step S406.

[0165] In step S405, it is determined whether the instantaneous value of the approximate temperature difference is greater than the set value of the approximate temperature difference. If yes, the process proceeds to step 407, otherwise, the process proceeds to step S406.

[0166] In step S406, the cooling pump frequency setting value is increased or the cooling water supply and return water temperature difference setting value is decreased.

[0167] For example, the frequency setting value of the cooling pump can be increased by a first predetermined frequency value. For example, the range of the first predetermined frequency value is 5 Hz to 10 Hz. The range of the first predetermined frequency value can effectively increase the frequency of the cooling water pump, thereby increasing the cooling water flow rate, so that the heat of the cooling water that can be taken away per unit time is also increased accordingly. Of course, the scope of the present disclosure is not limited to the specific value of the first predetermined frequency value, and the first predetermined frequency value can be set according to actual conditions or actual needs.

[0168] For another example, the cooling water supply and return water temperature difference setting value can be reduced by a first predetermined temperature value. For example, the first predetermined temperature value ranges from 1.5°C to 2.5°C. The range of the first predetermined temperature value can achieve an increase in the cooling water flow rate, so that the heat of the cooling water that can be taken away per unit time is also increased accordingly. For example, the first predetermined temperature value is 2°C. Of course, the scope of the present disclosure is not limited to the specific value of the first predetermined temperature value, and the first predetermined temperature value can be set according to actual conditions or actual needs.

[0169] Furthermore, after the cooling pump frequency setting value is increased or the cooling water supply and return water temperature difference setting value is decreased, and the duration satisfies the second duration setting value Δη2, the process returns to judgment 1, that is, returns to step S302.

[0170] For example, the range of the second duration setting value Δη2 is 1min to 3min. The range of the second duration setting value is mainly used to indicate the response time of the change in the system after increasing the cooling water pump frequency setting value or reducing the cooling water supply and return water temperature difference setting value, that is, the time interval from the change of the parameter to the system's response. Different operations may have different time intervals, depending on the response speed of the control parameter itself. Of course, the present disclosure is not limited to the specific value of the second duration setting value, and the second duration setting value can be set according to actual conditions or actual needs.

[0171] In step S407, it is determined whether the cooling pump dispatchability is greater than or equal to the cooling tower dispatchability. If yes, the process proceeds to step S408; otherwise, the process proceeds to step S409.

[0172] In step S408, the cooling pump frequency setting value is increased or the cooling water supply and return water temperature difference setting value is decreased. For example, the cooling pump frequency setting value may be increased by a first predetermined frequency value. For another example, the cooling water supply and return water temperature difference setting value may be decreased by a first predetermined temperature value.

[0173] Furthermore, after the cooling pump frequency setting value is increased or the cooling water supply and return water temperature difference setting value is decreased, and the duration satisfies the fourth duration setting value Δη4, the process returns to judgment 1, that is, returns to step S302.

[0174] For example, the fourth time setting value Δη4 is the same as the second time setting value Δη2. Therefore, the range of the fourth time setting value Δη4 can also be 1min to 3min. The range of the fourth time setting value is mainly used to indicate the response time of the change in the system after increasing the cooling water pump frequency setting value or reducing the cooling water supply and return water temperature difference setting value. Of course, the present disclosure is not limited to the specific value of the fourth time setting value, and the fourth time setting value can be set according to actual conditions or actual needs.

[0175] In step S409, the cooling tower fan is increased in frequency to the maximum frequency or the approximate temperature difference setting value is reduced. That is, the cooling tower fan frequency setting value is adjusted to the cooling tower fan frequency upper limit value or the approximate temperature difference setting value is reduced. For example, the approximate temperature difference setting value is reduced by a second predetermined temperature value. For example, the second predetermined temperature value ranges from 1.5°C to 2.5°C. For example, the second predetermined temperature value is 2°C.

[0176] In the above process, when the cooling pump dispatchable is greater than or equal to the cooling tower dispatchable, that is, adjusting the parameters of the cooling pump can obtain greater benefits, then when the cooling pump dispatchable is less than the cooling tower dispatchable, then adjusting the cooling tower parameters can obtain greater benefits. Therefore, in step S409, adjust the cooling tower fan frequency setting value to the cooling tower fan frequency upper limit value or reduce the approximate temperature difference setting value.

[0177] Furthermore, after the cooling tower fan is frequency-increased to the maximum frequency or frequency-decreased to the approximate temperature difference setting value, and the duration satisfies the third duration setting value Δη3, the process returns to judgment 1, that is, returns to step S302.

[0178] For example, the range of the third time setting value Δη3 is 7 minutes to 9 minutes. The range of the third time setting value is mainly used to indicate the response time of the change reflected in the system after adjusting the cooling tower fan frequency setting value or the approaching temperature difference setting value, that is, the time interval from changing the parameter (cooling tower fan frequency setting value or approaching temperature difference setting value) to the system responding (for example, whether the condensing temperature has dropped). Of course, the present disclosure is not limited to the specific value of the third time setting value, and the third time setting value can be set according to actual conditions or actual needs.

[0179] In step S410, it is determined whether the instantaneous value of the approximate temperature difference is greater than the set value of the approximate temperature difference. If yes, the process proceeds to step S411; otherwise, the process proceeds to step 420.

[0180] In step S411, it is determined whether the cooling tower fan has room for frequency increase. For example, the instantaneous value of the cooling tower fan frequency and the upper limit value of the cooling tower fan frequency are evaluated to determine whether the cooling tower fan has room for frequency increase. If yes, the process proceeds to step S412; otherwise, the process proceeds to step S413.

[0181] In step S412, the cooling tower fan frequency is increased to the maximum frequency or the approximate temperature difference setting value is reduced. That is, the cooling tower fan frequency setting value is adjusted to the cooling tower fan frequency upper limit value or the approximate temperature difference setting value is reduced. For example, the approximate temperature difference setting value is reduced by a second predetermined temperature value. For example, the second predetermined temperature value ranges from 1.5°C to 2.5°C. For example, the second predetermined temperature value is 2°C.

[0182] Furthermore, after the cooling tower fan is frequency-increased to the maximum frequency or frequency-decreased to the approximate temperature difference setting value, and the duration satisfies the first duration setting value Δη1, the process returns to judgment 1, that is, returns to step S302.

[0183] For example, the first duration setting value Δη1 is the same as the third duration setting value Δη3. Therefore, the range of the first duration setting value Δη1 can also be 7 minutes to 9 minutes. The range of the first duration setting value is mainly used to indicate the response time of the change reflected in the system after adjusting the cooling tower fan frequency setting value or the approaching temperature difference setting value. Of course, the present disclosure is not limited to the specific value of the first duration setting value, and the first duration setting value can be set according to actual conditions or actual needs.

[0184] In step S413, it is determined whether there is room for increasing the number of cooling towers in operation. If yes, the process proceeds to step S414; otherwise, the process proceeds to step S420.

[0185] In step S414, it is determined whether there is room for adding more chillers. If yes, the process proceeds to step S415, otherwise, the process proceeds to step S416.

[0186] In step S415, it is determined whether the instantaneous value of the chilled water outlet temperature is greater than the chilled water outlet temperature setting value. If yes, the process proceeds to step S417; otherwise, the process proceeds to step S424.

[0187] In step S416, the number of cooling towers in operation is increased. A first predetermined number of cooling towers may be increased in operation. For example, one cooling tower may be increased in operation.

[0188] Further, after the number of cooling towers in operation is increased and the duration meets the sixth duration setting value Δη6, the process returns to judgment 1, that is, returns to step S302.

[0189] For example, the range of the sixth time setting value Δη6 is 7 minutes to 12 minutes. The range of the sixth time setting value is mainly used to indicate the response time of the change reflected in the system after adding a cooling tower, that is, the time interval from changing the parameter (for example, adding a cooling tower) to the system responding (for example, whether the condensing temperature has dropped). Of course, the present disclosure is not limited to the specific value of the sixth time setting value, and the sixth time setting value can be set according to actual conditions or actual needs.

[0190] In step S417, it is determined whether the number of cooling towers that can be dispatched is greater than or equal to the number of chillers that can be dispatched. If so, the process proceeds to step S418; otherwise, the process proceeds to step S419.

[0191] In step S418, the number of cooling towers in operation is increased. For example, one cooling tower is increased in operation. Further, after the number of cooling towers in operation is increased and the duration meets the eighth duration setting value Δη8, the process returns to judgment 1, that is, returns to step S302.

[0192] For example, the eighth time setting value Δη8 is the same as the sixth time setting value Δη6. Therefore, the range of the eighth time setting value Δη8 can also be 7 minutes to 12 minutes. The range of the eighth time setting value Δη8 is mainly used to indicate the response time of the change reflected in the system after increasing the operation of the cooling tower. Of course, the present disclosure is not limited to the specific value of the eighth time setting value, and the eighth time setting value can be set according to actual conditions or actual needs.

[0193] In step S419, the number of chillers in operation is increased. A second predetermined number of chillers may be increased, for example, one chiller is increased.

[0194] Further, after the number of operating chillers is increased and the duration meets the seventh duration setting value Δη7, the process returns to judgment 1, that is, returns to step S302.

[0195] For example, the range of the seventh time setting value Δη7 is 15 minutes to 20 minutes. The range of the seventh time setting value Δη7 is mainly used to indicate the response time of the change reflected in the system after adding the chiller, that is, the time interval from changing the parameter (for example, adding a chiller) to the system responding (for example, whether the condensing temperature drops). Of course, the present disclosure is not limited to the specific value of the seventh time setting value, and the seventh time setting value can be set according to the actual situation or actual needs.

[0196] In step S420, it is determined whether the instantaneous value of the chilled water outlet temperature is greater than the chilled water outlet temperature setting value. If yes, the process proceeds to step S421, otherwise, the process proceeds to step S425.

[0197] In step S421, it is determined whether there is room for adding more chillers. If yes, the process proceeds to step S422; otherwise, the process proceeds to step S423.

[0198] In step S422, the number of chillers in operation is increased. For example, one chiller is increased in operation. Further, after the number of chillers in operation is increased and the duration meets the fifth duration setting value Δη5, the process returns to judgment 1, that is, returns to step S302.

[0199] For example, the fifth duration setting value Δη5 is the same as the seventh duration setting value Δη7. Therefore, the range of the fifth duration setting value Δη5 can also be 15min to 20min. The range of the fifth duration setting value Δη5 is mainly used to indicate the response time of the changes reflected in the system after increasing the operation of the chiller, that is, the time interval from changing the parameters (for example, increasing the operation of a chiller) to the system responding (for example, whether the condensing temperature has dropped). Of course, the present disclosure is not limited to the specific value of the fifth duration setting value, and the fifth duration setting value can be set according to actual conditions or actual needs.

[0200] In step S423, the chilled water outlet temperature setting value is increased, for example, the chilled water outlet temperature setting value is increased by a third predetermined temperature value.

[0201] For example, the range of the third predetermined temperature value may be 3°C to 5°C. The range of the third predetermined temperature value can reduce the output of the chiller, thereby reducing the "demand" borne by the chiller, thereby reducing the burden, thereby reducing the condensing temperature. Of course, the present disclosure is not limited to the specific value of the third predetermined temperature value, and the third predetermined temperature value can be set according to actual conditions or actual needs.

[0202] Further, after the chilled water outlet temperature setting value is increased and the duration thereof satisfies the ninth duration setting value Δη9, the process returns to judgment 1, that is, returns to step S302.

[0203] For example, the range of the ninth time setting value Δη9 is 1min to 2min. The range of the ninth time setting value Δη9 is mainly used to indicate the response time of the change reflected in the system after the chilled water outlet temperature setting value is increased, that is, the time interval from changing the parameter (increasing the chilled water outlet temperature setting value) to the system responding (for example, whether the condensing temperature drops). Of course, the present disclosure is not limited to the specific value of the ninth time setting value, and the ninth time setting value can be set according to actual conditions or actual needs.

[0204] In step S424, it is determined whether the ratio of the number of cooling towers in operation to the number of chillers in operation is within a predetermined ratio range. If yes, the process proceeds to step S416; otherwise, the process proceeds to step S425.

[0205] For example, the predetermined ratio range is [0.5, 2.5]. In this way, it is determined whether 0.5≤number of cooling towers in operation / number of chillers in operation≤2.5 is satisfied. Of course, the present disclosure is not limited to the specific value of the predetermined ratio range, and the predetermined ratio range can be set according to actual conditions or actual needs.

[0206] In step S425, it is determined whether the refrigeration pump has room for frequency reduction. For example, the instantaneous value of the refrigeration pump frequency and the lower limit value of the refrigeration pump frequency are evaluated to determine whether the refrigeration pump has room for frequency reduction. If yes, the process proceeds to step S426; otherwise, the process proceeds to step S427.

[0207] In step S426, the chilled water pump frequency setting value is lowered or the chilled water supply and return water temperature difference setting value is increased.

[0208] For example, the freezing pump frequency setting value can be reduced by a second predetermined frequency value. For example, the second predetermined frequency value ranges from 5 Hz to 10 Hz. Of course, the scope of the present disclosure is not limited to the specific value of the second predetermined frequency value, and the second predetermined frequency value can be set according to actual conditions or actual needs.

[0209] For example, the chilled water supply and return water temperature difference setting value is increased by a fourth predetermined temperature value. For example, the fourth predetermined temperature value ranges from 1.5° C. to 2.5° C. For example, the fourth predetermined temperature value is 2° C.

[0210] Further, after lowering the frequency setting value of the refrigeration pump or increasing the supply and return temperature difference setting value of the chilled water, and the duration meets the tenth duration setting value Δη10, the process returns to judgment 1, that is, returns to step S302.

[0211] For example, the range of the tenth time setting value Δη10 is 1min to 2min. The range of the tenth time setting value Δη10 is mainly used to indicate the response time of the change reflected in the system after reducing the frequency setting value of the chilled water pump or increasing the temperature difference between the chilled water supply and return water, that is, the time interval from changing the parameter (reducing the frequency setting value of the chilled water pump or increasing the temperature difference between the chilled water supply and return water) to the system responding (for example, whether the condensing temperature has dropped). Of course, the present disclosure is not limited to the specific value of the tenth time setting value, and the tenth time setting value can be set according to actual conditions or actual needs.

[0212] In step S427, the operating parameters are not adjusted, that is, the device schedulability does not meet the requirements, and the device operating parameters are not adjusted.

[0213] So far, a control method for an air conditioning system according to other embodiments of the present disclosure is provided. The control method describes a process of performing a process corresponding to a first risk level. This can predict the first risk or a fault corresponding to the first risk that may occur in the air conditioning system, thereby facilitating risk reduction or fault avoidance.

[0214] In some embodiments, the above parameters also include: instantaneous value of cooling water supply and return water temperature difference, setting value of cooling water supply and return water temperature difference, instantaneous value of cooling pump frequency and upper limit value of cooling pump frequency. For example, the instantaneous value of cooling water supply and return water temperature difference can be obtained by collecting through temperature sensor and calculating; the setting value of cooling water supply and return water temperature difference, instantaneous value of cooling pump frequency and upper limit value of cooling pump frequency can be obtained by data collection from the controller of air conditioning system.

[0215] On this basis, the processing corresponding to the second risk level includes: judging whether the instantaneous value of the cooling water supply and return water temperature difference is greater than the cooling water supply and return water temperature difference setting value; if so, judging whether there is room for the cooling pump to increase the frequency based on the instantaneous value of the cooling pump frequency and the upper limit value of the cooling pump frequency; otherwise, the operating parameters of the air-conditioning system are not adjusted.

[0216] In this embodiment, when Tnb≤Tn<Tnx and ΔTn / Δd>0, the duration Δµ is satisfied, indicating that the condensing temperature of the chiller has exceeded the high pressure holding temperature limit Tnb and has a trend of continuous increase, and when the instantaneous value of the cooling water supply and return temperature difference is less than or equal to the instantaneous value setting value of the cooling water supply and return temperature difference, it indicates that the cooling tower and the cooling water pump have completed their respective work well within their respective capabilities (the cooling pump is responsible for the flow and circulation of water, and the cooling tower is responsible for the cooling of water). The subsequent frequency increase of the cooling water pump and the cooling tower fan may not bring much effect improvement. This may be due to the outdoor weather conditions being too bad or other reasons. In short, it has exceeded the ability of intervening in the system through the control parameters, so the operating parameters of the air conditioning system are not adjusted; when the instantaneous value of the cooling water supply and return temperature difference is greater than the instantaneous value setting value of the cooling water supply and return temperature difference, the system can be regulated by the control parameters. In this way, the air conditioning system is regulated based on the instantaneous value of the cooling water supply and return temperature difference and the setting value of the cooling water supply and return temperature difference, thereby facilitating the reduction of risks or avoiding failures.

[0217] In some embodiments, the above parameters also include: cooling tower fan frequency instantaneous value, cooling tower fan frequency upper limit value, approximate temperature difference instantaneous value and approximate temperature difference setting value. For example, the approximate temperature difference instantaneous value can be obtained by collecting through a temperature sensor and calculating, and the cooling tower fan frequency instantaneous value, cooling tower fan frequency upper limit value and approximate temperature difference setting value can be obtained from the controller of the air conditioning system through data collection.

[0218] On this basis, executing the processing corresponding to the second risk level also includes: when it is determined that the cooling pump has room for frequency upgrade, judging whether the cooling tower fan has room for frequency upgrade based on the instantaneous value of the cooling tower fan frequency and the upper limit value of the cooling tower fan frequency; when it is determined that the cooling pump does not have room for frequency upgrade, judging whether the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference set value.

[0219] In the above embodiment, when the instantaneous value of the cooling water supply and return water temperature difference is greater than the cooling water supply and return water temperature difference set value, it indicates that at least one of the cooling tower and the cooling pump has room for improvement within their respective capabilities. Therefore, in the above embodiment, when it is determined that the cooling pump has room for frequency upgrade, it is judged whether the cooling tower fan has room for frequency upgrade. When it is determined that the cooling pump does not have room for frequency upgrade, it is judged whether the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference set value. In this way, the system can be processed under different conditions of the cooling pump, thereby making a more precise prediction of possible risks or failures of the air-conditioning system, thereby more accurately and conveniently reducing risks or avoiding failures.

[0220] In some embodiments, the above parameters further include: a cooling pump frequency setting value. For example, the cooling pump frequency setting value can be obtained from a controller of the air conditioning system through data acquisition.

[0221] On this basis, executing the processing corresponding to the second risk level also includes: when it is determined that there is room for frequency upgrade of the cooling tower fan, judging whether the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference setting value; when it is determined that there is no room for frequency upgrade of the cooling tower fan, increasing the cooling pump frequency setting value or lowering the cooling water supply and return water temperature difference setting value.

[0222] In the above embodiment, if there is room for frequency upgrade of the cooling tower fan, subsequent processing is performed based on the approximate instantaneous value of the temperature difference and the approximate temperature difference setting value. If there is no room for frequency upgrade of the cooling tower fan, it means that based on the current number of cooling towers in operation, the cooling tower cannot improve its heat dissipation capacity. However, if the heat of the cooling water cannot be discharged in time, the condensation temperature cannot be effectively improved. Therefore, increasing the cooling pump frequency setting value or lowering the cooling water supply and return water temperature difference setting value can increase the cooling water flow rate. In this way, the heat of the cooling water that can be taken away per unit time also increases accordingly, thereby improving the cooling capacity of the air-conditioning system.

[0223] In some embodiments, the above parameters also include: cooling pump schedulability, cooling tower schedulability and cooling tower fan frequency setting value. For example, the cooling pump schedulability and cooling tower schedulability can be calculated by the calculation relationships (1) and (2) described above. For example, the cooling tower fan frequency setting value can be obtained from the controller of the air conditioning system through data acquisition.

[0224] On this basis, executing the processing corresponding to the second risk level also includes: for the case where there is room for frequency upgrade of the cooling pump and the fan of the cooling tower, if it is determined that the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference setting value, then determine whether the cooling pump can be dispatched greater than or equal to the cooling tower can be dispatched, if so, then increase the cooling pump frequency setting value or lower the cooling water supply and return water temperature difference setting value, otherwise, increase the cooling tower fan frequency setting value or lower the approximate temperature difference setting value; for the case where there is room for frequency upgrade of the cooling pump and the fan of the cooling tower, if it is determined that the instantaneous value of the approximate temperature difference is less than or equal to the approximate temperature difference setting value, then increase the cooling pump frequency setting value or lower the cooling water supply and return water temperature difference setting value.

[0225] In the above embodiment, when the instantaneous value of the approximate temperature difference is greater than the set value of the approximate temperature difference, it indicates that the cooling pump and the cooling tower both have room for improvement within their respective capabilities. At this time, the control parameters need to determine which parameter can be adjusted to bring greater benefits. Therefore, by judging whether the cooling pump is schedulable or the cooling tower is schedulable, a choice that brings greater benefits can be made, thereby regulating the air-conditioning system for maximum benefits. When there is room for frequency increase for both the cooling water pump and the cooling tower fan, if the instantaneous value of the approximate temperature difference is less than or equal to the set value of the approximate temperature difference, it indicates that the cooling tower has completed the corresponding task well (for example, reducing the cooling tower outlet water temperature), so the cooling pump can still have room for improvement within its capabilities. Therefore, the cooling pump frequency setting value is increased or the cooling water supply and return water temperature setting value is reduced, thereby achieving more accurate regulation of the air-conditioning system.

[0226] In some embodiments, executing the processing corresponding to the second risk level also includes: for the case where there is no room for frequency upgrade of the cooling pump, if the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference setting value, then based on the instantaneous value of the cooling tower fan frequency and the upper limit value of the cooling tower fan frequency, determine whether there is room for frequency upgrade of the cooling tower fan, and if so, increase the cooling tower fan frequency setting value or lower the approximate temperature difference setting value, otherwise, do not adjust the operating parameters of the air-conditioning system; for the case where there is no room for frequency upgrade of the cooling pump, if the instantaneous value of the approximate temperature difference is less than or equal to the approximate temperature difference setting value, do not adjust the operating parameters of the air-conditioning system.

[0227] In the above embodiment, when there is no room for frequency increase in the cooling water pump, it indicates that there is no room for the cooling water pump to increase. Therefore, the relative relationship between the approximate instantaneous value of the temperature difference and the approximate temperature difference setting value is determined. When the approximate instantaneous value of the temperature difference is greater than the approximate temperature difference setting value, it indicates that the cooling tower has not achieved the preset setting value target, thereby determining whether there is room for frequency increase in the cooling tower fan. If there is room for frequency increase, the cooling tower fan frequency setting value is increased or the approximate temperature difference setting value is decreased on the basis that there is no room for the cooling water pump to increase. When the approximate instantaneous value of the temperature difference is less than or equal to the approximate temperature difference setting value, the operating parameters of the air conditioning system are not adjusted. In this way, the parameters of the air conditioning system can be flexibly adjusted.

[0228] Figure 5 is a flow chart showing a control method for an air conditioning system according to other embodiments of the present disclosure. Figure 5 The control method shown describes executing the processing corresponding to the second risk level. Figure 5 As shown, the control method includes steps S501 to S512.

[0229] In step S501, it is determined whether the instantaneous value of the cooling water supply and return water temperature difference is greater than the cooling water supply and return water temperature difference setting value. If yes, the process proceeds to step S502; otherwise, the process proceeds to step S512, that is, the equipment dispatchability does not meet the requirements, and the equipment operating parameters are not adjusted.

[0230] In step S502, it is determined whether the cooling pump has room for frequency upgrade. For example, the instantaneous value of the cooling pump frequency and the upper limit value of the cooling pump frequency are evaluated to determine whether the cooling pump has room for frequency upgrade. If yes, the process proceeds to step S503; otherwise, the process proceeds to step S509.

[0231] In step S503, it is determined whether the cooling tower fan has room for frequency increase. For example, the instantaneous value of the cooling tower fan frequency and the upper limit value of the cooling tower fan frequency are evaluated to determine whether the cooling tower fan has room for frequency increase. If yes, the process proceeds to step S504; otherwise, the process proceeds to step S505.

[0232] In step S504, it is determined whether the instantaneous value of the approximate temperature difference is greater than the set value of the approximate temperature difference. If yes, the process proceeds to step S506; otherwise, the process proceeds to step S505.

[0233] In step S505, the cooling pump frequency setting value is increased or the cooling water supply and return water temperature difference setting value is decreased.

[0234] For example, the frequency setting value of the cooling pump can be increased by a third predetermined frequency value. For example, the range of the third predetermined frequency value is 5 Hz to 10 Hz. The range of the third predetermined frequency value can effectively increase the frequency of the cooling water pump, thereby increasing the cooling water flow rate, so that the heat of the cooling water that can be taken away per unit time is also increased accordingly. Of course, the scope of the present disclosure is not limited to the specific value of the third predetermined frequency value, and the third predetermined frequency value can be set according to actual conditions or actual needs.

[0235] For another example, the cooling water supply and return water temperature difference setting value can be reduced by a fifth predetermined temperature value. For example, the fifth predetermined temperature value ranges from 0.5°C to 1.5°C. For example, the fifth predetermined temperature value is 1°C. The temperature range of the fifth predetermined temperature value can achieve an increase in the cooling water flow rate, thereby increasing the amount of heat that can be taken away from the cooling water per unit time. Of course, the scope of the present disclosure is not limited to the specific value of the fifth predetermined temperature value, and the fifth predetermined temperature value can be set according to actual conditions or actual needs.

[0236] Further, after the cooling pump frequency setting value is increased or the cooling water supply and return water temperature difference setting value is decreased, and the duration meets the twelfth duration setting value Δη12, the process returns to judgment 2, that is, returns to step S305.

[0237] For example, the range of the twelfth time length setting value Δη12 is 1min to 3min. The range of the twelfth time length setting value Δη12 is mainly used to indicate the response time of the system change after increasing the cooling water pump frequency setting value or reducing the cooling water supply and return water temperature difference setting value. Of course, the scope of the present disclosure is not limited to the specific value of the twelfth time length setting value, and the twelfth time length setting value can be set according to actual conditions or actual needs.

[0238] In step S506, it is determined whether the cooling pump dispatchability is greater than or equal to the cooling tower dispatchability. If yes, the process proceeds to step S507; otherwise, the process proceeds to step S508.

[0239] In step S507, the cooling pump frequency setting value is increased or the cooling water supply and return water temperature difference setting value is decreased.

[0240] For example, the cooling pump frequency setting value may be increased by the third predetermined frequency value (eg, 5 Hz). For another example, the cooling water supply and return water temperature difference setting value may be reduced by the fifth predetermined temperature value (eg, 1° C.).

[0241] Further, after the cooling pump frequency setting value is increased or the cooling water supply and return water temperature difference setting value is decreased, and the duration meets the fourteenth duration setting value Δη14, the process returns to judgment 2, that is, returns to step S305.

[0242] For example, the fourteenth time-length setting value Δη14 is the same as the twelfth time-length setting value Δη12. Therefore, the range of the fourteenth time-length setting value Δη14 can also be 1 min to 3 min. The range of the fourteenth time-length setting value is mainly used to indicate the response time of the change in the system after increasing the cooling water pump frequency setting value or reducing the cooling water supply and return water temperature difference setting value. Of course, the scope of the present disclosure is not limited to the specific value of the fourteenth time-length setting value, and the fourteenth time-length setting value can be set according to actual conditions or actual needs.

[0243] In step S508, the cooling tower fan frequency setting value is increased or the approaching temperature difference setting value is decreased.

[0244] For example, the cooling tower fan frequency setpoint may be increased by a fourth predetermined frequency value.

[0245] For example, the range of the fourth predetermined frequency value is 8 Hz to 12 Hz. For example, the fourth predetermined frequency value is 10 Hz. The range of the fourth predetermined frequency value can effectively increase the frequency of the cooling tower fan, thereby increasing the air intake per unit time of the cooling tower, so that the heat of the cooling water that can be taken away by the cooling tower per unit time is also increased accordingly. Of course, the scope of the present disclosure is not limited to the specific value of the fourth predetermined frequency value, and the fourth predetermined frequency value can be set according to actual conditions or actual needs.

[0246] For example, the approaching temperature difference set value may be reduced by a sixth predetermined temperature value.

[0247] For example, the range of the sixth predetermined temperature value is 0.5°C to 1°C. The range of the sixth predetermined temperature value can effectively improve the heat dissipation capacity of the cooling tower, so that the cooling tower outlet water temperature is lower, and more condenser heat is taken away by cooling water. Of course, the scope of the present disclosure is not limited to the specific value of the sixth predetermined temperature value, and the sixth predetermined temperature value can be set according to actual conditions or actual needs.

[0248] Further, after the cooling tower fan frequency setting value is increased or the approaching temperature difference setting value is decreased, and the duration satisfies the thirteenth duration setting value Δη13, the process returns to judgment 2, that is, returns to step S305.

[0249] For example, the range of the thirteenth time length setting value Δη13 is 7min to 9min. The range of the thirteenth time length setting value Δη13 is mainly used to indicate the response time of the change reflected in the system after adjusting the cooling tower fan frequency setting value or the approaching temperature difference setting value, that is, the time interval from changing the parameter (cooling tower fan frequency setting value or approaching temperature difference setting value) to the system responding (for example, whether the condensing temperature has dropped). Of course, the scope of the present disclosure is not limited to the specific value of the thirteenth time length setting value, and the thirteenth time length setting value can be set according to actual conditions or actual needs.

[0250] In step S509, it is determined whether the instantaneous value of the approximate temperature difference is greater than the set value of the approximate temperature difference. If yes, the process proceeds to step S510; otherwise, the process proceeds to step S512, that is, the equipment dispatchability does not meet the requirements, and the equipment operating parameters are not adjusted.

[0251] In step S510, it is determined whether the cooling tower fan has room for frequency increase. For example, the instantaneous value of the cooling tower fan frequency and the upper limit value of the cooling tower fan frequency are evaluated to determine whether the cooling tower fan has room for frequency increase. If yes, the process proceeds to step S511; otherwise, the process proceeds to step S512, that is, the equipment dispatchability does not meet the requirements, and the equipment operating parameters are not adjusted.

[0252] In step S511, the cooling tower fan frequency setting value is increased or the approximate temperature difference setting value is decreased. For example, the cooling tower fan frequency setting value may be increased by the fourth predetermined frequency value. For another example, the approximate temperature difference setting value may be decreased by the sixth predetermined temperature value.

[0253] Further, after the cooling tower fan frequency setting value is increased or the approaching temperature difference setting value is decreased, and the duration satisfies the eleventh duration setting value Δη11, the process returns to judgment 2, that is, returns to step S305.

[0254] For example, the eleventh duration setting value Δη11 is the same as the thirteenth duration setting value Δη13. Therefore, the range of the eleventh duration setting value Δη11 can also be 7 min to 9 min. The range of the eleventh duration setting value Δη11 is mainly used to indicate the response time of the change reflected in the system after adjusting the cooling tower fan frequency setting value or the approaching temperature difference setting value. Of course, the scope of the present disclosure is not limited to the specific value of the eleventh duration setting value, and the eleventh duration setting value can be set according to actual conditions or actual needs.

[0255] In step S512, the operating parameters are not adjusted.

[0256] So far, a control method for an air conditioning system according to other embodiments of the present disclosure is provided. The control method describes a process of performing a process corresponding to the second risk level. This can predict the second risk or the fault corresponding to the second risk that may occur in the air conditioning system, thereby facilitating risk reduction or fault avoidance.

[0257] In some embodiments, the above parameters also include: instantaneous value of cooling water supply and return water temperature difference, setting value of cooling water supply and return water temperature difference, instantaneous value of cooling pump frequency, upper limit value of cooling pump frequency, setting value of cooling pump frequency and setting value of cooling water supply and return water temperature difference. For example, the instantaneous value of cooling water supply and return water temperature difference can be obtained by temperature sensor acquisition and calculation. For example, the setting value of cooling water supply and return water temperature difference, the instantaneous value of cooling pump frequency, upper limit value of cooling pump frequency, setting value of cooling pump frequency and setting value of cooling water supply and return water temperature difference can be obtained from the controller of the air conditioning system through data acquisition.

[0258] On this basis, the processing corresponding to the third risk level includes: judging whether the instantaneous value of the cooling water supply and return temperature difference is greater than the cooling water supply and return temperature difference setting value; when it is determined that the instantaneous value of the cooling water supply and return temperature difference is greater than the cooling water supply and return temperature difference setting value, judging whether there is room for frequency increase of the cooling pump based on the instantaneous value of the cooling pump frequency and the upper limit of the cooling pump frequency, if so, increasing the cooling pump frequency setting value or lowering the cooling water supply and return temperature difference setting value, otherwise, not adjusting the operating parameters of the air-conditioning system; when it is determined that the instantaneous value of the cooling water supply and return temperature difference is less than or equal to the cooling water supply and return temperature difference setting value, not adjusting the operating parameters of the air-conditioning system.

[0259] The above embodiment describes the process of executing the processing corresponding to the third risk level. This can predict the third risk or the fault corresponding to the third risk that may occur in the air-conditioning system, thereby facilitating risk reduction or fault avoidance.

[0260] Figure 6 is a flow chart showing a control method for an air conditioning system according to other embodiments of the present disclosure. Figure 6 The control method shown describes executing the processing corresponding to the third risk level. Figure 6 As shown, the control method includes steps S601 to S604.

[0261] In step 601, determine whether the instantaneous value of the cooling water supply and return water temperature difference is greater than the cooling water supply and return water temperature difference set value. If so, the process enters step S602; otherwise, the process enters step S604, that is, the equipment dispatchability does not meet the requirements and no adjustment is made to the equipment operating parameters.

[0262] In step S602, it is determined whether the cooling pump has room for frequency upgrade. For example, the instantaneous value of the cooling pump frequency and the upper limit value of the cooling pump frequency are evaluated to determine whether the cooling pump has room for frequency upgrade. If yes, the process proceeds to step S603; otherwise, the process proceeds to step S604, that is, the device schedulability does not meet the requirements, and the device operating parameters are not adjusted.

[0263] In step S603, the cooling pump frequency setting value is increased or the cooling water supply and return water temperature difference setting value is decreased. For example, the cooling pump frequency setting value may be increased by the third predetermined frequency value (e.g., 5 Hz). For another example, the cooling water supply and return water temperature difference setting value may be decreased by the fifth predetermined temperature value (e.g., 1°C).

[0264] Further, after the cooling pump frequency setting value is increased or the cooling water supply and return water temperature difference setting value is decreased, and the duration meets the fifteenth duration setting value Δη15, the process returns to judgment 3, that is, returns to step S308.

[0265] For example, the range of the fifteenth time length setting value Δη15 is 1min to 3min. The range of the fifteenth time length setting value Δη15 is mainly used to indicate the response time of the system change after increasing the cooling water pump frequency setting value or reducing the cooling water supply and return water temperature difference setting value. Of course, the scope of the present disclosure is not limited to the specific value of the fifteenth time length setting value, and the fifteenth time length setting value can be set according to actual conditions or actual needs.

[0266] In step S604, the operating parameters are not adjusted.

[0267] So far, a control method for an air conditioning system according to other embodiments of the present disclosure is provided. The control method describes a process of performing a process corresponding to the third risk level. This can predict the third risk or a fault corresponding to the third risk that may occur in the air conditioning system, thereby facilitating risk reduction or fault avoidance.

[0268] In summary, the present disclosure provides a control method, in which, combined with the high-pressure side pressure control mechanism of the chiller, multi-level defensive control is adopted for the chiller with the risk of high-pressure protection shutdown, the equipment operating parameters are adaptively adjusted according to different risk levels, and based on the control limit over-limit amplitude and the equipment dispatchability, the optimal execution adjustment sequence of the equipment is determined to achieve early prediction and active defense of the risk of high-pressure protection shutdown. This control method can protect the unit more effectively, avoid the phenomenon that the unit is on the verge of or directly undergoes high-pressure protection shutdown, extend the life of the unit, further improve the system stability and fault tolerance, and improve the constancy of the room temperature.

[0269] In this control method, active defense measures are taken for chillers with the risk of high-pressure protection shutdown. According to the high-pressure side pressure control mechanism of the chiller, active defensive control is divided into three risk levels: high-pressure maintenance, high-pressure unloading, and high-pressure protection. The equipment operating parameters are adaptively adjusted according to different risk levels.

[0270] Figure 7 Schematically shows a block diagram of a control device for an air conditioning system according to some embodiments of the present disclosure. The control device includes a memory 710 and a processor 720. Among them:

[0271] The memory 710 can be a disk, a flash memory, or any other non-volatile storage medium. The memory is used to store Figures 2 to 6 At least one of the corresponding embodiments of the instructions.

[0272] The processor 720 is coupled to the memory 710 and can be implemented as one or more integrated circuits, such as a microprocessor or a microcontroller. The processor 720 is used to execute instructions stored in the memory, and can predict the risks or failures that may occur in the air conditioning system, thereby facilitating risk reduction or failure avoidance.

[0273] In some embodiments, it is also possible to Figure 8 As shown, the control device 800 includes a memory 810 and a processor 820. The processor 820 is coupled to the memory 810 via a BUS bus 830. The control device 800 can also be connected to an external storage device 850 via a storage interface 840 to call external data, and can also be connected to a network or another computer system (not shown) via a network interface 860, which will not be described in detail here.

[0274] In this embodiment, by storing data instructions in a memory and then processing the instructions through a processor, possible risks or failures of the air-conditioning system can be predicted, thereby facilitating risk reduction or failure avoidance.

[0275] In some embodiments of the present disclosure, an air conditioning system is further provided, comprising: the control device as described above (for example, Figure 7 or Figure 8 controls shown).

[0276] For example, the air conditioning system may also include: a cooling tower, a cooling pump, a chiller and a refrigeration pump, etc.

[0277] In some embodiments, the present disclosure further provides a computer-readable storage medium (eg, a non-transitory computer-readable storage medium) having computer program instructions stored thereon, which when executed by a processor implements Figures 2 to 6 The present invention is a method for performing a method of performing a computer program product in at least one of the embodiments of the present invention. It should be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, devices, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable non-transient storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0278] The present disclosure is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present disclosure. It should be understood that each process and / or block in the flowchart and / or block diagram and the combination of processes and / or blocks in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1A device that provides the functions specified in a block or multiple blocks.

[0279] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0280] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0281] In some embodiments of the present disclosure, a computer program product is further provided. The computer program product includes a computer program or instructions. When the computer program or instructions are executed by a processor, the control method as described above is implemented.

[0282] In some embodiments of the present disclosure, a computer program is further provided, comprising: instructions, which, when executed by a processor, cause the processor to execute the control method as described above.

[0283] So far, the present disclosure has been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0284] Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A control method for an air conditioning system, wherein: The air conditioning system includes a chiller, and the control method includes: Obtaining parameters of the air conditioning system, wherein the parameters include: a condensing temperature and a condensing temperature change rate of a condenser in the chiller; and When the condensing temperature is within a predetermined risk level temperature range, the condensing temperature change rate is greater than zero, and the duration meets a predetermined duration, the risk level of the air conditioning system is determined, and processing corresponding to the risk level is performed.

2. The control method according to claim 1, wherein: The air conditioning system also includes a cooling tower, a cooling pump and a refrigeration pump; When the condensing temperature is within a predetermined risk level temperature range, the condensing temperature change rate is greater than zero, and the duration meets a predetermined duration, determining the risk level of the air conditioning system, and performing processing corresponding to the risk level includes: When the condensing temperature is less than or equal to the first temperature threshold and greater than or equal to the second temperature threshold, the condensing temperature change rate is greater than zero, and the duration reaches a first predetermined duration, determining that the air conditioning system is at a first risk level, and performing processing corresponding to the first risk level; When the condensing temperature is less than the second temperature threshold and greater than or equal to the third temperature threshold, the condensing temperature change rate is greater than zero, and the duration reaches a second predetermined duration, determining that the air conditioning system is at a second risk level, and performing processing corresponding to the second risk level; and When the condensing temperature is lower than the third temperature threshold and greater than or equal to the fourth temperature threshold, the condensing temperature change rate is greater than zero, and the duration reaches a third predetermined duration, it is determined that the air-conditioning system is at a third risk level, and processing corresponding to the third risk level is performed.

3. The control method according to claim 2, wherein: The parameters also include: instantaneous value of cooling water supply and return water temperature difference, set value of cooling water supply and return water temperature difference, instantaneous value of cooling pump frequency and upper limit value of cooling pump frequency; Executing a process corresponding to the first risk level includes: Determine whether the instantaneous value of the cooling water supply and return water temperature difference is greater than the cooling water supply and return water temperature difference set value; if so, determine whether there is room for the cooling pump to increase its frequency based on the instantaneous value of the cooling pump frequency and the upper limit value of the cooling pump frequency; otherwise, do not adjust the operating parameters of the air-conditioning system.

4. The control method according to claim 3, wherein: The parameters also include: cooling tower fan frequency instantaneous value, cooling tower fan frequency upper limit value, approaching temperature difference instantaneous value and approaching temperature difference set value; Executing the process corresponding to the first risk level further includes: In the case where it is determined that the cooling pump has room for frequency upgrade, judging whether the fan of the cooling tower has room for frequency upgrade based on the instantaneous value of the cooling tower fan frequency and the upper limit value of the cooling tower fan frequency; and When it is determined that there is no frequency upgrade room for the cooling pump, it is determined whether the instantaneous value of the approximate temperature difference is greater than the set value of the approximate temperature difference.

5. The control method according to claim 4, wherein: The parameters also include: cooling pump frequency setting value; Executing the process corresponding to the first risk level further includes: In the case where it is determined that there is room for frequency increase of the fan of the cooling tower, judging whether the instantaneous value of the approximate temperature difference is greater than the set value of the approximate temperature difference; When it is determined that there is no room for frequency increase of the fan of the cooling tower, the frequency setting value of the cooling pump is increased or the temperature difference setting value of the cooling water supply and return water is decreased.

6. The control method according to claim 5, wherein: The parameters also include: cooling pump dispatchability, cooling tower dispatchability and cooling tower fan frequency setting value; Executing the process corresponding to the first risk level further includes: In the case where there is room for frequency increase of the cooling pump and there is room for frequency increase of the fan of the cooling tower, if it is determined that the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference setting value, it is determined whether the cooling pump can be dispatched greater than or equal to the cooling tower can be dispatched, if so, the cooling pump frequency setting value is increased or the cooling water supply and return water temperature difference setting value is decreased, otherwise, the cooling tower fan frequency setting value is adjusted to the cooling tower fan frequency upper limit value or the approximate temperature difference setting value is decreased; In the case where there is room for frequency upgrade of the cooling pump and the fan of the cooling tower, if it is determined that the instantaneous value of the approximate temperature difference is less than or equal to the approximate temperature difference setting value, the cooling pump frequency setting value is increased or the cooling water supply and return water temperature difference setting value is decreased.

7. The control method according to claim 4, wherein: The parameters also include: the number of cooling towers in operation, the instantaneous value of the chilled water outlet temperature and the set value of the chilled water outlet temperature; Executing the process corresponding to the first risk level further includes: In the case where the cooling pump has no room for frequency increase, if the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference setting value, then based on the instantaneous value of the cooling tower fan frequency and the upper limit value of the cooling tower fan frequency, determine whether the fan of the cooling tower has room for frequency increase; if so, adjust the cooling tower fan frequency setting value to the upper limit value of the cooling tower fan frequency or reduce the approximate temperature difference setting value; otherwise, determine whether there is room for increasing the number of cooling towers in operation; In the case where the cooling pump has no frequency upgrade space, if the instantaneous value of the approximate temperature difference is less than or equal to the approximate temperature difference setting value, it is determined whether the instantaneous value of the chilled water outlet temperature is greater than the chilled water outlet temperature setting value.

8. The control method according to claim 7, wherein: The parameters also include: the number of chillers in operation; Executing the process corresponding to the first risk level further includes: If there is room for increasing the number of cooling towers in operation, determine whether there is room for increasing the number of chillers in operation; In the case that there is no room for increasing the number of operating cooling towers, it is determined whether the instantaneous value of the chilled water outlet temperature is greater than the set value of the chilled water outlet temperature.

9. The control method according to claim 8, wherein: The parameters also include: the number of cooling towers that can be dispatched and the number of chillers that can be dispatched; Executing the process corresponding to the first risk level further includes: Determine whether there is room for adding more chillers; if so, determine whether the instantaneous value of the chilled water outlet temperature is greater than the chilled water outlet temperature setting value; otherwise, increase the number of cooling towers to operate by a first predetermined number; In the case where it is determined that the instantaneous value of the chilled water outlet temperature is greater than the set value of the chilled water outlet temperature, determining whether the number of cooling towers that can be dispatched is greater than or equal to the number of chillers that can be dispatched; When it is determined that the instantaneous value of the chilled water outlet temperature is less than or equal to the set value of the chilled water outlet temperature, it is determined whether the ratio of the number of operating cooling towers to the number of operating chillers is within a predetermined ratio range.

10. The control method according to claim 9, wherein: Executing the process corresponding to the first risk level further includes: When the number of cooling towers that can be dispatched is greater than or equal to the number of chillers that can be dispatched, adding a first predetermined number of cooling towers for operation; When the number of cooling towers that can be dispatched is less than the number of chillers that can be dispatched, a second predetermined number of chillers are added for operation.

11. The control method according to claim 7 or 8, wherein: The parameters also include: the number of chillers in operation, the instantaneous value of the freezing pump frequency, the lower limit of the freezing pump frequency, the freezing pump frequency setting value and the chilled water supply and return water temperature difference setting value; Executing the process corresponding to the first risk level further includes: When the instantaneous value of the chilled water outlet temperature is greater than the chilled water outlet temperature setting value, determining whether there is room for adding more chillers, if yes, adding a second predetermined number of chillers, otherwise, increasing the chilled water outlet temperature setting value; When the instantaneous value of the chilled water outlet temperature is less than or equal to the set value of the chilled water outlet temperature, determine whether the chilled pump has room for frequency reduction based on the instantaneous value of the chilled pump frequency and the lower limit value of the chilled pump frequency. If so, lower the set value of the chilled pump frequency or increase the set value of the chilled water supply and return water temperature difference. Otherwise, do not adjust the operating parameters of the air-conditioning system.

12. The control method according to claim 11, wherein: Executing the process corresponding to the first risk level further includes: When the ratio of the number of cooling towers in operation to the number of chillers in operation is within a predetermined ratio range, adding a first predetermined number of cooling towers in operation; When the ratio of the number of operating cooling towers to the number of operating chillers is outside the predetermined ratio range, determine whether there is room for frequency reduction of the chiller pump based on the instantaneous value of the chiller pump frequency and the lower limit value of the chiller pump frequency. If so, lower the chiller pump frequency setting value or increase the chilled water supply and return water temperature difference setting value. Otherwise, do not adjust the operating parameters of the air-conditioning system.

13. The control method according to claim 9, wherein: The number of cooling towers that can be dispatched D_nt is ， Among them, T_dai is the approximate instantaneous value of temperature difference, T_das is the approximate set value of temperature difference, T_dasu is the upper limit of the approximate set value of temperature difference, N_tm is the upper limit of the number of cooling towers, and N_to is the number of cooling towers in operation; The number of chillers that can be dispatched D_nc is: ， Among them, Ti_cw is the instantaneous value of the chilled water outlet temperature, Ts_cw is the set value of the chilled water outlet temperature, Tus_cw is the upper limit of the set value of the chilled water outlet temperature, N_cm is the upper limit of the number of chillers, and N_co is the number of chillers in operation.

14. The control method according to claim 2, wherein: The parameters also include: instantaneous value of cooling water supply and return water temperature difference, set value of cooling water supply and return water temperature difference, instantaneous value of cooling pump frequency and upper limit value of cooling pump frequency; Executing a process corresponding to the second risk level includes: Determine whether the instantaneous value of the cooling water supply and return water temperature difference is greater than the cooling water supply and return water temperature difference set value; if so, determine whether there is room for the cooling pump to increase its frequency based on the instantaneous value of the cooling pump frequency and the upper limit value of the cooling pump frequency; otherwise, do not adjust the operating parameters of the air-conditioning system.

15. The control method according to claim 14, wherein: The parameters also include: cooling tower fan frequency instantaneous value, cooling tower fan frequency upper limit value, approaching temperature difference instantaneous value and approaching temperature difference set value; Executing the process corresponding to the second risk level further includes: In the case where it is determined that the cooling pump has room for frequency upgrade, judging whether the fan of the cooling tower has room for frequency upgrade based on the instantaneous value of the cooling tower fan frequency and the upper limit value of the cooling tower fan frequency; When it is determined that there is no frequency upgrade room for the cooling pump, it is determined whether the instantaneous value of the approximate temperature difference is greater than the set value of the approximate temperature difference.

16. The control method according to claim 15, wherein: The parameters also include: cooling pump frequency setting value; Executing the process corresponding to the second risk level further includes: In the case where it is determined that there is room for frequency increase of the fan of the cooling tower, judging whether the instantaneous value of the approximate temperature difference is greater than the set value of the approximate temperature difference; When it is determined that there is no room for frequency increase of the fan of the cooling tower, the frequency setting value of the cooling pump is increased or the temperature difference setting value of the cooling water supply and return water is decreased.

17. The control method according to claim 16, wherein: The parameters also include: cooling pump dispatchability, cooling tower dispatchability and cooling tower fan frequency setting value; Executing the process corresponding to the second risk level further includes: In the case where there is room for frequency increase of the cooling pump and there is room for frequency increase of the fan of the cooling tower, if it is determined that the instantaneous value of the approximate temperature difference is greater than the approximate temperature difference setting value, it is determined whether the cooling pump can be dispatched is greater than or equal to the cooling tower can be dispatched, if so, the cooling pump frequency setting value is increased or the cooling water supply and return water temperature difference setting value is decreased, otherwise, the cooling tower fan frequency setting value is increased or the approximate temperature difference setting value is decreased; In the case where there is room for frequency upgrade of the cooling pump and the fan of the cooling tower, if it is determined that the instantaneous value of the approximate temperature difference is less than or equal to the approximate temperature difference setting value, the cooling pump frequency setting value is increased or the cooling water supply and return water temperature difference setting value is decreased.

18. The control method according to claim 15, wherein: Executing the process corresponding to the second risk level further includes: In the case where the cooling pump has no frequency upgrade space, if the approximate temperature difference instantaneous value is greater than the approximate temperature difference setting value, then based on the cooling tower fan frequency instantaneous value and the cooling tower fan frequency upper limit value, it is determined whether the cooling tower fan has frequency upgrade space, and if so, the cooling tower fan frequency setting value is increased or the approximate temperature difference setting value is decreased, otherwise, the operating parameters of the air conditioning system are not adjusted; In the case where there is no room for frequency upgrading of the cooling pump, if the instantaneous value of the approximate temperature difference is less than or equal to the set value of the approximate temperature difference, the operating parameters of the air-conditioning system are not adjusted.

19. The control method according to claim 6 or 17, wherein: The cooling pump can be scheduled D_p as ， Among them, Ti_dcsr is the instantaneous value of the cooling water supply and return water temperature difference, Ts_dcsr is the cooling water supply and return water temperature difference setting value, Tus_dcsr is the upper limit of the cooling water supply and return water temperature difference setting value, f_up is the upper limit of the cooling pump frequency, and f_ip is the instantaneous value of the cooling pump frequency; The cooling tower can be dispatched D_t as ， Among them, T_dai is the approximate instantaneous value of temperature difference, T_das is the approximate set value of temperature difference, T_dasu is the upper limit value of the approximate set value of temperature difference, f_ut is the upper limit value of cooling tower fan frequency, and f_it is the instantaneous value of cooling tower frequency.

20. The control method according to claim 2, wherein: The parameters also include: instantaneous value of cooling water supply and return water temperature difference, setting value of cooling water supply and return water temperature difference, instantaneous value of cooling pump frequency, upper limit value of cooling pump frequency, setting value of cooling pump frequency and setting value of cooling water supply and return water temperature difference; Executing a process corresponding to the third risk level includes: Determine whether the instantaneous value of the cooling water supply and return water temperature difference is greater than the cooling water supply and return water temperature difference setting value; In the case where it is determined that the instantaneous value of the cooling water supply and return water temperature difference is greater than the cooling water supply and return water temperature difference setting value, based on the instantaneous value of the cooling pump frequency and the cooling pump frequency upper limit value, it is judged whether there is room for frequency increase of the cooling pump, if yes, the cooling pump frequency setting value is increased or the cooling water supply and return water temperature difference setting value is decreased, otherwise, the operating parameters of the air conditioning system are not adjusted; When it is determined that the instantaneous value of the cooling water supply and return water temperature difference is less than or equal to the cooling water supply and return water temperature difference set value, the operating parameters of the air conditioning system are not adjusted.

21. The control method according to claim 2, further comprising: When the condensing temperature is lower than the fourth temperature threshold, the operating parameters of the air conditioning system are not adjusted; When the condensing temperature is greater than the first temperature threshold, the air conditioning system is controlled to shut down.

22. A control device for an air conditioning system, comprising: Memory; as well as A processor coupled to the memory, wherein the processor is configured to execute the control method according to any one of claims 1 to 21 based on instructions stored in the memory.

23. An air conditioning system, comprising: A control device as claimed in claim 22.

24. A computer-readable storage medium having computer instructions stored thereon, wherein the computer instructions, when executed by a processor, implement the control method according to any one of claims 1 to 21.

25. A computer program product, comprising a computer program or instructions, which implement the control method according to any one of claims 1 to 21 when executed by a processor.

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