Unit load regulation and control method and device, air conditioning equipment and storage medium

Abstract

The invention discloses a unit load regulation and control method and device and air conditioning equipment. The method comprises the steps that after a unit is started, according to the actual operation frequency and loading parameters of the unit, whether the total duration needed by the unit from starting to operation to the full load frequency meets the preset time requirement or not is judged, and if not, the loading parameters are adjusted; a unit COP is obtained, and whether the unit COP meets a preset performance requirement or not is judged; if not, the opening degree of an electronic expansion valve of the unit is adjusted; and if the opening degree of the electronic expansion valve is reduced, the adjustment is determined to be continued or stopped according to the change of the evaporation temperature. According to the invention, by intelligently adjusting unit loading control parameters, different rapid loading time requirements are met; the opening degree of the electronic expansion valve of the system can be continuously adjusted according to the current operation state, so that the operation energy efficiency requirements of the unit under different working conditions are met, and efficient and stable operation of the unit is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning equipment, and in particular to a method and device for controlling unit load, and air conditioning equipment. Background Art

[0002] Screw units are widely used in various refrigeration environments due to their high reliability and wide operating range. With the continuous development and improvement of science and technology, as well as the continuous improvement of living standards, the demand for high-efficiency machine rooms, precision air-conditioning machine rooms, process air-conditioning machine rooms, etc. is increasing. The requirements for the overall energy efficiency level and load control stability of screw units are getting higher and higher.

[0003] For conventional variable frequency screw units, the loading and unloading frequency parameter settings of the units are usually carried out according to fixed parameters for loading and unloading control, which will result in fixed loading and unloading time of the units. This cannot meet the requirements of fast startup of high-efficiency computer room air conditioners under different working conditions, as well as the requirements of process air conditioners and precision air conditioners for efficient operation of the units.

[0004] With regard to the problem in the prior art that the unit cannot achieve rapid startup and has poor operating efficiency, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present invention provide a method, a device and an air-conditioning device for controlling the load of a unit, so as to solve the problem in the prior art that the unit cannot be started quickly and has poor operating efficiency.

[0006] In order to solve the above technical problems, the present invention provides a unit load control method, wherein the method comprises: after the unit is started, judging whether the total time required for the unit from starting to running to the full load frequency meets the preset time requirements according to the actual operating frequency and loading parameters of the unit, and adjusting the loading parameters if it does not meet the requirements; obtaining the unit COP, judging whether the unit COP meets the preset performance requirements; if it does not meet the requirements, adjusting the opening of the electronic expansion valve of the unit; if the opening of the electronic expansion valve is to be reduced, determining whether to continue adjusting or stop adjusting according to the change of evaporation temperature.

[0007] Furthermore, based on the actual operating frequency and loading parameters of the unit, it is determined whether the total time required for the unit to start up and run to the full load frequency meets the preset time requirement, including: calculating the total time required for the unit to start up and run to the full load frequency based on the actual operating frequency and loading parameters of the unit; and determining whether the total time is less than or equal to the preset time, and if so, determining that the total time meets the preset time requirement, and if not, determining that the total time does not meet the preset time requirement.

[0008] Furthermore, based on the actual operating frequency and loading parameters of the unit, the total time required for the computer group to run from startup to full load frequency includes: based on the actual operating frequency and loading parameters of the unit, the time T1 required for the computer group to run from the actual operating frequency to the full load frequency; adding the time T2 from the startup of the unit to the actual operating frequency to obtain the total time.

[0009] Further, according to the actual operating frequency and loading parameters of the unit, the time T1 required for the computer unit to run from the actual operating frequency to the full load frequency is realized by the following formula:

[0010] T1=a*(Q0-Q1) / V1;

[0011] V1=f1 / t1;

[0012] The loading parameters include loading frequency and loading cycle, f1 is the loading frequency, t1 is the loading cycle, V1 is the loading rate, a is the proportionality coefficient, Q0 is the full load frequency, and Q1 is the actual operating frequency.

[0013] Further, if it does not meet the requirements, the loading parameters are adjusted, including: if the total duration does not meet the preset time requirement, increasing the loading frequency and / or decreasing the loading period; wherein the loading parameters include the loading frequency and the loading period.

[0014] Furthermore, determining whether the COP of the unit meets the preset performance requirements includes: calculating a deviation value between the COP of the unit and a preset COP; and determining whether the deviation value is within a preset range, and if so, determining that the COP of the unit meets the preset performance requirements; and if not, determining that the COP of the unit does not meet the preset performance requirements.

[0015] Furthermore, if it does not meet the requirements, the opening of the electronic expansion valve of the unit is adjusted, including: obtaining the temperature difference at the evaporator end; wherein the temperature difference at the evaporator end is the difference between the chilled water outlet temperature and the evaporation temperature; and increasing or decreasing the opening of the electronic expansion valve according to whether the temperature difference at the evaporator end is within a preset reasonable range.

[0016] Furthermore, depending on whether the temperature difference at the evaporator end is within a preset reasonable range, the opening of the electronic expansion valve is increased or decreased, including: if the temperature difference at the evaporator end is within the preset reasonable range, decreasing the opening of the electronic expansion valve; if the temperature difference at the evaporator end is not within the preset reasonable range, increasing the opening of the electronic expansion valve.

[0017] Furthermore, if the opening of the electronic expansion valve is to be reduced, whether to continue adjusting or stop adjusting is determined according to the change in the evaporation temperature, including: in the process of reducing the opening of the electronic expansion valve, detecting whether the evaporation temperature changes; if the evaporation temperature decreases and the decrease exceeds a preset value, stopping the adjustment and maintaining the current opening of the electronic expansion valve; otherwise, continuing to reduce the opening of the electronic expansion valve.

[0018] Furthermore, the method also includes: detecting the water temperature change rate of the chilled water outlet temperature of the unit; judging whether the operating state of the unit meets the preset water temperature change requirement according to the water temperature change rate, and adjusting the water temperature change rate if it does not meet the requirement.

[0019] Furthermore, the water temperature change rate of the chilled water outlet temperature of the unit is detected, including:

[0020] When the temperature difference between the chilled water outlet temperature of the unit and the preset water temperature is within a preset range, the detection cycle is started; based on the water temperature at the beginning and the end of the detection cycle, the water temperature change rate of the chilled water outlet temperature of the computer unit is calculated.

[0021] Further, judging whether the unit operation state meets the preset water temperature change requirement according to the water temperature change rate includes: calculating the preset water temperature change rate according to the detection period; wherein the preset water temperature change rate △T0=b / detection period, b is a preset difference;

[0022] Determine whether the water temperature change rate of the chilled water outlet temperature is less than or equal to the preset water temperature change rate. If so, determine that the water temperature change rate meets the preset water temperature change requirement. If not, determine that the water temperature change rate does not meet the preset water temperature change requirement.

[0023] Further, if the condition is not satisfied, the water temperature change rate is adjusted, including: if the condition is not satisfied, reducing the operating frequency of the unit to adjust the water temperature change rate.

[0024] The present invention also provides a unit load control device, wherein the device comprises:

[0025] The first adjustment module is used to determine whether the total time required for the unit to start up and run to full load frequency meets the preset time requirement according to the actual operating frequency and loading parameters of the unit after the unit is started, and adjust the loading parameters if it does not meet the preset time requirement;

[0026] The second adjustment module is used to obtain the COP of the unit and determine whether the COP of the unit meets the preset performance requirements; if not, adjust the opening of the electronic expansion valve of the unit; if the opening of the electronic expansion valve is to be reduced, determine whether to continue or stop the adjustment according to the change of the evaporation temperature.

[0027] Furthermore, the device also includes: a third adjustment module, which is used to detect the water temperature change rate of the unit's chilled water outlet temperature; determine whether the unit's operating status meets the preset water temperature change requirements based on the water temperature change rate, and adjust the water temperature change rate if it does not meet the requirements.

[0028] The present invention also provides an air conditioning device, wherein the air conditioning device includes the above-mentioned unit load control device.

[0029] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the program implements the above method when executed by a processor.

[0030] By applying the technical solution of the present invention, an adaptive and energy-efficient intelligent load control solution is provided. During the startup and shutdown and normal operation of the unit, the loading and unloading frequency parameters and the electronic expansion valve control parameters of the unit are continuously optimized and adjusted according to the actual load demand, loading time demand, etc., to ensure that the unit can meet the requirements of different loading times and can achieve the best energy efficiency state under full load conditions. By intelligently adjusting the loading control parameters of the unit, different fast loading time requirements are met. The opening of the electronic expansion valve is adaptively adjusted according to the actual load state of the unit to ensure the safe and efficient operation of the unit under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a flow chart of a method for controlling unit load according to an embodiment of the present invention;

[0032] Figure 2 is a schematic diagram of intelligent adjustment of unit loading parameters according to an embodiment of the present invention;

[0033] Figure 3 is a schematic diagram of intelligent optimal control of an electronic expansion valve of a unit according to an embodiment of the present invention;

[0034] Figure 4 is a schematic diagram of adaptive load stabilization control of a unit according to an embodiment of the present invention;

[0035] Figure 5 is a diagram of an adaptive high energy efficiency intelligent load control system according to an embodiment of the present invention;

[0036] Figure 6 4 is a structural block diagram of a unit load control device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0039] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0040] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0041] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0042] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0043] Example 1

[0044] According to an embodiment of the present invention, an embodiment of a unit load control method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0045] Figure 1 is a flow chart of a method for controlling unit load according to an embodiment of the present invention. Figure 1 As shown, the method comprises the following steps:

[0046] Step S101, after the unit is started, according to the actual operating frequency and loading parameters of the unit, it is determined whether the total time required for the unit to start and run to full load frequency meets the preset time requirement, and if not, the loading parameters are adjusted;

[0047] Step S102, obtaining the unit COP and determining whether the unit COP meets the preset performance requirements; if not, adjusting the opening of the unit's electronic expansion valve; if the opening of the electronic expansion valve is to be reduced, determining whether to continue adjusting or stop adjusting according to the change in evaporation temperature.

[0048] This embodiment provides an adaptive and energy-efficient intelligent load control solution, wherein the above step S101 is an intelligent quick start solution, and the above step S102 is an efficient control solution. During the startup and shutdown and normal operation of the unit, this embodiment continuously optimizes and adjusts the unit's loading and unloading frequency parameters and the electronic expansion valve control parameters according to the actual load demand, loading time demand, etc., to ensure that the unit can meet the requirements of different loading times and can achieve the best energy efficiency state under full load conditions. Different rapid loading time requirements are met by intelligently adjusting the unit's loading control parameters. The electronic expansion valve opening is adaptively adjusted according to the actual load state of the unit to ensure safe and efficient operation of the unit under different working conditions.

[0049] The intelligent quick start solution and the efficient control solution are introduced below.

[0050] (1) Intelligent quick start solution

[0051] Figure 2 is a schematic diagram of intelligent adjustment of unit loading parameters according to an embodiment of the present invention, such as Figure 2 As shown in the figure, the process of intelligent adjustment of unit loading parameters is as follows:

[0052] When the unit is started, the unit will combine the actual loading frequency setting parameters (referred to as: loading parameters, including loading frequency and loading cycle) and the current operating frequency to calculate the time T required for the unit to run to the specified load Q0 (i.e. full load frequency), and compare T with the preset time requirement T预设 Compare and if the current loading parameters can meet the requirements, do not adjust the loading parameters. If it exceeds the required time range, adjust the existing loading parameters.

[0053] Based on this, this embodiment provides a preferred implementation method, that is, according to the actual operating frequency and loading parameters of the unit, it is judged whether the total time required for the unit to start from start to run to the full load frequency meets the preset time requirements, including: according to the actual operating frequency and loading parameters of the unit, the total time required for the computer unit to start from start to run to the full load frequency; judge whether the total time is less than or equal to the preset time, if so, it is determined that the total time meets the preset time requirements, if not, it is determined that the total time does not meet the preset time requirements. Based on this, it is possible to quickly and accurately judge whether the current loading parameters of the unit can meet the unit's startup time requirements. If the requirements for efficient and rapid startup of the unit cannot be achieved, the loading parameters are adjusted in time to shorten the startup time.

[0054] When calculating the total time T required for the unit to start up and run to the full load frequency, we can first calculate the time T1 required for the unit to run from the actual operating frequency to the full load frequency based on the actual operating frequency and loading parameters of the unit; then add T1 to the time T2 from the unit starting up to loading to the actual operating frequency to get the total time T. Based on this, we can accurately calculate the total time T required for the unit to start up and run to the full load frequency, and no matter at which time the total time T is calculated, we can get an accurate T value.

[0055] The calculation of the time T1 required for the unit to run from the actual operating frequency to the full load frequency can be achieved by the following formula:

[0056] T1=a*(Q0-Q1) / V1;

[0057] V1=f1 / t1;

[0058] Total duration T = a*(Q0-Q1) / V1+T2.

[0059] Among them, the loading parameters include loading frequency and loading cycle, f1 is the loading frequency, t1 is the loading cycle, V1 is the loading rate, a is the proportional coefficient, Q0 is the full load frequency, and Q1 is the actual operating frequency.

[0060] The unit loading process is affected by two parameters: loading frequency f and loading cycle t. Based on the loading frequency f and loading cycle t, the unit loading rate V (f / t) can be accurately calculated. For example, if the loading frequency is 1Hz and the loading cycle is 1s, the actual loading is 1Hz per second. The time T required for the unit to run to full load in this state can be obtained by the loading rate V and the unit's current operating frequency Q1 and full load frequency Q0, and then T and the required full load time T can be calculated. 预设 (preset time requirement) for comparison, and further adjust the loading parameters based on the comparison results. If the total time T does not meet the preset time requirement T 预设 , then increase the loading frequency and / or reduce the loading cycle, so as to shorten the startup time of the unit in time, meet the startup time requirements of the unit, and achieve the requirements of efficient and fast startup of the unit.

[0061] The following examples are given below:

[0062] Assuming the full load frequency of the unit is 200Hz, the current frequency is 120Hz, the loading frequency f is 1, and the loading cycle is 2s, it means that the time required for the unit to load to full load is T1=(200-120) / (1 / 2)=160S. Add the time T2 from the start of the unit to the load to 120Hz, and the total time from the start of the unit to the full load is T=T1+T2. Then, compare T with the preset time requirement T 预设 , if T≤T 预设 , then there is no need to adjust the loading parameters. If T>T 预设 , it is determined that the current loading parameters do not meet the time requirements for full load, and the unit loading parameters need to be adjusted: increase the loading frequency and / or reduce the loading cycle. Then the adjusted parameters are recalculated and compared according to the above formula, and the unit startup time is controlled in real time from the start of the unit to the loading to full load. It can meet the high-speed startup requirements of the high-efficiency machine room.

[0063] (2) Efficient control solution

[0064] Figure 3 is a schematic diagram of intelligent optimization control of an electronic expansion valve of a unit according to an embodiment of the present invention. Figure 3 As shown in the figure, the process of intelligent optimization control of the unit's electronic expansion valve is as follows:

[0065] After the unit is turned on, it can achieve the best energy efficiency under different load conditions. The unit will obtain the unit energy efficiency ratio COP based on parameters such as water temperature, flow, frequency, load, combined with factory tests and calculation data. The unit COP (Coefficient Of Performance) energy efficiency ratio is the conversion ratio between energy and heat, referred to as the energy efficiency ratio, which is the ratio of the compressor's cooling capacity to the consumed electrical power consumption. The specific calculation formula is: COP = cooling capacity / cooling power. Among them, cooling capacity refers to the amount of heat that the air conditioner can remove per unit time, and cooling power represents the amount of electricity consumed by the air conditioner in the same period of time.

[0066] At the same time, based on the previous parameters and combined with the unit power, the actual performance coefficient N1 of the unit in this state is calculated. By comparing N1 and N0, if the deviation is within a reasonable range, no adjustment will be made temporarily. If N1 is lower than N0 by more than the deviation value △N, the opening of the throttling electronic expansion valve will be automatically optimized.

[0067] Based on this, this embodiment provides a preferred implementation method, that is, judging whether the COP of the unit meets the preset performance requirements, including: calculating the deviation value between the COP of the unit and the preset COP; judging whether the deviation value is within the preset range, if yes, determining that the COP of the unit meets the preset performance requirements, if no, determining that the COP of the unit does not meet the preset performance requirements. Based on this, it is possible to accurately and quickly judge whether the COP of the unit meets the preset performance requirements, and if not, it can be adjusted in time.

[0068] When adjusting the opening of the electronic expansion valve, it can be achieved through the following preferred implementation: obtaining the temperature difference at the evaporator end; wherein the temperature difference at the evaporator end is the difference between the chilled water outlet temperature and the evaporation temperature; according to whether the temperature difference at the evaporator end is within the preset reasonable range, increasing or decreasing the opening of the electronic expansion valve. Specifically, if the temperature difference at the evaporator end is within the preset reasonable range, the opening of the electronic expansion valve is decreased; if the temperature difference at the evaporator end is not within the preset reasonable range, the opening of the electronic expansion valve is increased. Thus, the opening of the electronic expansion valve can be adaptively adjusted according to the actual load state of the unit, ensuring the safe and efficient operation of the unit under different working conditions.

[0069] During the adjustment process, it will first determine whether the temperature difference at the evaporator end (the difference between the chilled water outlet temperature and the evaporation temperature) is within a reasonable range of △h (5%). If it exceeds △h, the electronic expansion valve opening will be adjusted according to the opening change △d1 to control the evaporation temperature within △h. On the contrary, if the temperature difference at the evaporator end is within △h, the opening will be continuously reduced according to the opening change △d2, and the evaporation temperature change will be detected while adjusting the opening. When the decline exceeds △T1, the adjustment will be stopped, and the throttling electronic expansion valve opening will be restored to the previous action value.

[0070] △h refers to the temperature difference at the evaporator end, that is, the difference between the chilled water outlet temperature and the evaporation temperature. For example, if the chilled water outlet temperature is 7℃ and the evaporation temperature is 5.5℃, the temperature difference at the evaporator end △h is 1.5℃.

[0071] △d refers to the change in the opening degree of the electronic expansion valve control. For example, if the opening degree of the electronic expansion valve is 50 before adjustment and 48 after adjustment, then △d is 2.

[0072] △T1 refers to the drop in evaporation temperature. Generally, the evaporation temperature will change accordingly after adjusting the opening of the electronic expansion valve, and the change range before and after is △T1.

[0073] During the operation of the unit, the opening of the system electronic expansion valve will be continuously adjusted according to the current operating status to meet the energy efficiency requirements of the unit under different operating conditions. In the actual operation of the unit, the terminal temperature difference △h and the actual energy efficiency data N1 of the unit will be monitored in real time. If it is detected that N1 is less than the theoretical calculated value N0 and exceeds the deviation range △N, the opening of the unit system electronic expansion valve will be adjusted.

[0074] The following examples are introduced:

[0075] Assume that the unit's energy efficiency N1 is 5.1 when it is currently running, the theoretical energy efficiency value N0 in this state is 5.6, and the required △N0 value is 5%. At this time, the actual △N1 of the unit = (5.6-5.1) / 5.6 = 9%, and it will be judged that the unit's energy efficiency does not meet the requirements. On this basis, the terminal temperature difference will be further detected, and the detection process is divided into the following two situations.

[0076] The actual end temperature difference △h1 is greater than △h. At this time, the opening of the electronic expansion valve will be increased to control the end temperature difference within △h.

[0077] If the actual end temperature difference △h1 is less than △h, it will determine whether the electronic expansion valve is over-opened, and the opening of the electronic expansion valve will be reduced. At this time, so much refrigerant is not needed. At the same time, the evaporation temperature change is detected. If the evaporation temperature does not decrease at this time, it means that the electronic expansion valve is really over-opened, and the opening will continue to be adjusted. If the evaporation temperature decreases and the decrease exceeds △T1, it means that it has been reduced to the appropriate opening, and the current opening will be maintained according to the last adjustment.

[0078] The specific control methods are as follows:

[0079] 1.△h1≥△h: Increase the opening of the electronic expansion valve according to △d1;

[0080] 2.△h1<△h: Reduce the opening of the electronic expansion valve according to △d2, and adjust according to the following test results:

[0081] 2.1△T2≤△T1, continue to reduce the opening according to △d2;

[0082] 2.2△T2>△T1, the electronic expansion valve returns to the previous opening.

[0083] Based on this, this embodiment provides a preferred implementation method, that is, if the opening of the electronic expansion valve is reduced, whether to continue to adjust or stop the adjustment is determined according to the change of the evaporation temperature, including: in the process of reducing the opening of the electronic expansion valve, detecting whether the evaporation temperature changes; if the evaporation temperature decreases and exceeds the preset value, then stop adjusting and maintain the current opening of the electronic expansion valve; otherwise, continue to reduce the opening of the electronic expansion valve. Based on this, it is possible to timely detect whether the electronic expansion valve is over-opened, thereby ensuring the safe and efficient operation of the unit under different working conditions.

[0084] In addition to providing an intelligent quick start solution and an efficient control solution, this embodiment also takes into account the requirement of the computer room for stable water temperature during operation and proposes a water temperature stabilization control solution.

[0085] (3) Water temperature stabilization control scheme

[0086] In terms of unit load control, the unit is controlled by the chilled water outlet temperature. Assuming the set outlet water temperature is 7°C, the unit will be unloaded if the actual water temperature is lower than 7°C. If it is not controlled in advance, the water temperature will continue to drop when it reaches 7°C, and the water temperature will fluctuate. In order to control the water temperature to be stable, the water temperature change rate must be continuously adjusted.

[0087] Based on this, this embodiment proposes a water temperature stabilization control scheme, including: detecting the water temperature change rate of the unit's chilled water outlet temperature; judging whether the unit's operating status meets the preset water temperature change requirements based on the water temperature change rate, and adjusting the water temperature change rate if it does not meet the requirements.

[0088] Figure 4 is a schematic diagram of adaptive load stabilization control of a unit according to an embodiment of the present invention, such as Figure 4 As shown in the figure, the unit adaptive load stability control process is as follows:

[0089] When the unit is turned off, the water temperature of the unit will be close to room temperature. After the unit is turned on, the water temperature will drop and needs to be lowered to the specified water temperature (for example, 7°C). However, there is a time delay in the heat exchange and control of the unit, which will cause the water temperature after the control operation to be lower than the specified water temperature, which can easily cause the unit to be in standby mode and the user experience is not good.

[0090] In terms of water temperature (chilled water outlet temperature) control, this embodiment calculates the actual water temperature change rate Tv1 according to the state parameters during the operation of the unit, and then calculates whether the water temperature fluctuation can be controlled within the range of ΔT when the specified water temperature is reached under this state. If it can, continue to operate according to the current water temperature change rate, and if not, further adjust the operating state of the unit to obtain a new water temperature change rate parameter.

[0091] The water temperature change rate will be monitored during the actual operation of the unit. When the actual water temperature of the unit meets the approaching water temperature requirement (T specified water temperature - T actual water outlet ≤ T0, T0 = 2), the water temperature change rate will be monitored. The specific test and monitoring methods are as follows:

[0092] The unit has a fixed time detection cycle t0, and the initial chilled water outlet temperature T1 at the beginning of the cycle and the water temperature T2 at the end of the cycle are included in the cycle t0. When the actual chilled water temperature of the unit reaches the water temperature requirement, the current water temperature change rate of the unit △T=(T2-T1) / t0 can be calculated through T1, T2, and t0. Then it is compared with the water temperature change rate △T0 (△T0=(7-6.7) / 20=0.015℃ / s, the maximum allowable water temperature change rate) that can be required when the water temperature reaches the specified water temperature. If △T>△T0 is detected, it is judged that the current unit operation state does not meet the water temperature change requirement when the specified water temperature is reached, and the current load of the unit (actual operation frequency (using this word, full load frequency)=load frequency) is adjusted to adjust the water temperature change rate.

[0093] △T>△T0, it means that the water temperature changes too fast, and the unit operation frequency needs to be reduced to control the unit to unload, which is actually to reduce the unit load. △T≤△T0, no adjustment is required.

[0094] Based on this, this embodiment proposes a preferred implementation method, which detects the water temperature change rate of the chilled water outlet temperature of the unit, including: when the temperature difference between the chilled water outlet temperature of the unit and the preset water temperature is within a preset range, start the detection cycle; according to the water temperature at the beginning and the end of the detection cycle, calculate the water temperature change rate of the chilled water outlet temperature of the unit. Based on this, a more accurate water temperature change rate of the chilled water outlet temperature can be calculated.

[0095] When judging whether the operating state of the unit meets the preset water temperature change requirement based on the water temperature change rate, the preset water temperature change rate is calculated according to the detection period; wherein, the preset water temperature change rate △T0 = b / detection period, and b is the preset difference. Judge whether the water temperature change rate of the chilled water outlet temperature is less than or equal to the preset water temperature change rate. If so, determine that the water temperature change rate meets the preset water temperature change requirement. If not, determine that the water temperature change rate does not meet the preset water temperature change requirement. If not, adjust the water temperature change rate, specifically including: if not, reduce the operating frequency of the unit to adjust the water temperature change rate. In this way, the water temperature of the unit can be kept as stable as possible, and the high requirements of the efficient machine room for water temperature stability can be met.

[0096] The following examples are given below:

[0097] Assume that the current load of the unit is 100%, the specified chilled water outlet temperature set by the unit is 7℃, the approaching water temperature judgment temperature difference T0 is 3℃, and the actual chilled water temperature is 9℃. At this time, the actual water temperature difference is 2℃≤3℃, which has reached the approaching water temperature judgment requirement. At this time, it will enter the water temperature change rate monitoring stage. On this basis, it is further assumed that the detection cycle of the unit is 20s, the water temperature at the beginning of the detection cycle is 9℃, and the water temperature at the end of the detection time is 9.5℃. At this time, the water temperature change rate △T=(9.5-9) / 20=0.025℃ / s. In terms of △T0 calculation, according to the calculation that the water temperature change cannot exceed 0.3℃ when reaching the specified water temperature, the water temperature change rate △T0=(7-6.7) / 20=0.015℃ / s. At this time, △T>△T0, the current operating load of the unit will be reduced, and the load will be reduced to 95% before calculation and monitoring.

[0098] This embodiment proposes three intelligent adaptive control schemes based on the problems of startup loading time, load control, and unit energy efficiency control under different loads encountered during the automatic operation of the unit, which comprehensively ensures that the functions of intelligent loading time regulation, stable load output, and energy-saving and high efficiency of full-load conditions can be achieved during the entire operation of the unit. This embodiment meets different requirements for fast loading time by intelligently adjusting the unit loading control parameters; continuously adjusts the opening of the system electronic expansion valve according to the current operating status, thereby meeting the operating energy efficiency requirements of the unit under different operating conditions and achieving efficient and stable operation of the unit; and timely adjusts the water temperature change rate during the operation of the unit to improve the water temperature stability of the unit.

[0099] Example 2

[0100] Corresponds to Figure 1 The unit load control method described above, this embodiment provides a unit load control device, such as Figure 6 The structural block diagram of the unit load control device shown in FIG. 1 includes:

[0101] The first adjustment module 10 is used to determine whether the total time required for the unit to start up and run to full load frequency meets the preset time requirement according to the actual operating frequency and loading parameters of the unit after the unit is started, and adjust the loading parameters if it does not meet the preset time requirement;

[0102] The second adjustment module 20 is used to detect the water temperature change rate of the chilled water outlet temperature of the unit, and judge whether the unit operation state meets the preset water temperature change requirement according to the water temperature change rate, and adjust the water temperature change rate if it does not meet the requirement.

[0103] The above device also includes:

[0104] The third adjustment module 30 is used to obtain the unit COP and determine whether the unit COP meets the preset performance requirements; if not, adjust the opening of the unit's electronic expansion valve; if the opening of the electronic expansion valve is to be reduced, determine whether to continue adjusting or stop adjusting according to the change in evaporation temperature.

[0105] The first adjustment module 10 starts to execute its action when the unit is started, the second adjustment module 20 starts to execute its action when the temperature difference between the chilled water outlet temperature of the unit and the preset water temperature is within a preset range, and the third adjustment module 30 can execute its work during the startup and operation of the unit.

[0106] This embodiment further provides an air conditioning device, wherein the air conditioning device includes the unit load control device introduced above.

[0107] Example 3

[0108] This embodiment provides an electronic device, which is used in a method for controlling load of a unit. The electronic device includes: at least one processor; and a memory connected to the at least one processor in communication; wherein:

[0109] The memory stores instructions that can be executed by the one processor, and the instructions are executed by the at least one processor so that the at least one processor can achieve: after the unit is started, based on the actual operating frequency and loading parameters of the unit, determine whether the total time required for the unit to run from startup to full load frequency meets the preset time requirements, and if not, adjust the loading parameters; obtain the unit COP to determine whether the unit COP meets the preset performance requirements; if not, adjust the opening of the electronic expansion valve of the unit; if the opening of the electronic expansion valve is to be reduced, determine whether to continue adjusting or stop adjusting according to the change in evaporation temperature.

[0110] Example 4

[0111] The embodiment of the present invention provides a software, which is used to execute the technical solutions described in the above embodiment and preferred implementation manner.

[0112] An embodiment of the present invention provides a non-volatile computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions can execute the unit load control method in any of the above method embodiments.

[0113] The above-mentioned software is stored in the above-mentioned storage medium, which includes but is not limited to: a CD, a floppy disk, a hard disk, an erasable memory, etc.

[0114] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0115] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0116] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0117] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0118] The above product can execute the method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to the method provided by the embodiment of the present invention.

[0119] The electronic devices of the embodiments of the present invention exist in various forms, including but not limited to:

[0120] (1) Mobile communication devices: These devices are characterized by their mobile communication functions and their main purpose is to provide voice and data communications. These terminals include: smart phones (such as iPhone), multimedia phones, functional phones, and low-end phones.

[0121] (2) Ultra-mobile personal computer devices: These devices fall into the category of personal computers, have computing and processing capabilities, and generally also have mobile Internet access features. These terminals include: PDA, MID and UMPC devices, such as iPad.

[0122] (3) Portable entertainment devices: These devices can display and play multimedia content. They include audio and video players (such as iPods), handheld game consoles, e-books, as well as smart toys and portable car navigation devices.

[0123] (4) Server: A device that provides computing services. The server consists of a processor, hard disk, memory, device bus, etc. The server is similar to the general computer architecture, but because it needs to provide highly reliable services, it has higher requirements in terms of processing power, stability, reliability, security, scalability, manageability, etc.

[0124] (5) Other electronic devices with data interaction functions, such as televisions, large-screen cars, etc.

[0125] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0126] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling unit load, characterized in that: The method comprises: After the unit is started, according to the actual operating frequency and loading parameters of the unit, it is determined whether the total time required for the unit to start and run to full load frequency meets the preset time requirements, and if not, the loading parameters are adjusted; The COP of the unit is obtained to determine whether the COP of the unit meets the preset performance requirements; if not, the opening of the electronic expansion valve of the unit is adjusted; if the opening of the electronic expansion valve is reduced, whether to continue adjusting or stop adjusting is determined according to the change of the evaporation temperature.

2. The method according to claim 1, characterized in that According to the actual operating frequency and loading parameters of the unit, determine whether the total time required for the unit to start and run to full load frequency meets the preset time requirements, including: The total time required for the computer unit to start and run to full load frequency based on the actual operating frequency and loading parameters of the unit; Determine whether the total duration is less than or equal to a preset time. If so, determine that the total duration meets the preset time requirement. If not, determine that the total duration does not meet the preset time requirement.

3. The method according to claim 2, characterized in that According to the actual operating frequency and loading parameters of the unit, the total time required for the computer unit to start and run to full load frequency includes: According to the actual operating frequency and loading parameters of the unit, the time T1 required for the computer unit to run from the actual operating frequency to the full load frequency; The total duration is obtained by adding T1 to the time T2 from the start of the unit to the time when the unit is loaded to the actual operating frequency.

4. The method according to claim 3, characterized in that According to the actual operating frequency and loading parameters of the unit, the time T1 required for the computer unit to run from the actual operating frequency to the full load frequency is realized by the following formula: T1=a*(Q0-Q1) / V1; V1=f1 / t1; The loading parameters include loading frequency and loading cycle, f1 is the loading frequency, t1 is the loading cycle, V1 is the loading rate, a is the proportionality coefficient, Q0 is the full load frequency, and Q1 is the actual operating frequency.

5. The method according to claim 1, characterized in that If not, the loading parameters are adjusted, including: If the total duration does not meet the preset time requirement, the loading frequency is increased and / or the loading period is decreased; wherein the loading parameters include the loading frequency and the loading period.

6. The method according to claim 1, characterized in that Determining whether the COP of the unit meets the preset performance requirements includes: Calculating a deviation between the COP of the unit and a preset COP; It is determined whether the deviation value is within a preset range. If yes, it is determined that the COP of the unit meets the preset performance requirement. If no, it is determined that the COP of the unit does not meet the preset performance requirement.

7. The method according to claim 1, characterized in that If not, adjust the opening of the unit's electronic expansion valve, including: Obtaining the evaporator end temperature difference; wherein the evaporator end temperature difference is the difference between the chilled water outlet temperature and the evaporation temperature; The opening of the electronic expansion valve is increased or decreased according to whether the temperature difference at the evaporator end is within a preset reasonable range.

8. The method according to claim 7, characterized in that According to whether the temperature difference at the evaporator end is within a preset reasonable range, increasing or decreasing the opening of the electronic expansion valve includes: If the temperature difference at the evaporator end is within a preset reasonable range, reducing the opening of the electronic expansion valve; If the temperature difference at the evaporator end is not within a preset reasonable range, the opening of the electronic expansion valve is increased.

9. The method according to claim 1, characterized in that: If the opening of the electronic expansion valve is to be reduced, determining whether to continue adjusting or stop adjusting according to the change of the evaporation temperature includes: In the process of reducing the opening of the electronic expansion valve, detecting whether the evaporation temperature changes; If the evaporation temperature decreases and exceeds a preset value, the adjustment is stopped to maintain the current opening of the electronic expansion valve; Otherwise, continue to reduce the opening of the electronic expansion valve.

10. The method according to claim 1, characterized in that The method further comprises: Detect the water temperature change rate of the chilled water outlet temperature of the unit; It is determined whether the unit operation state meets the preset water temperature change requirement according to the water temperature change rate, and if not, the water temperature change rate is adjusted.

11. The method according to claim 10, characterized in that Detect the water temperature change rate of the chilled water outlet temperature of the unit, including: When the temperature difference between the chilled water outlet temperature of the unit and the preset water temperature is within the preset range, the detection cycle is started; The water temperature change rate of the chilled water outlet temperature of the computer group is calculated according to the water temperature at the beginning and the end of the detection cycle.

12. The method according to claim 11, characterized in that Judging whether the unit operation state meets the preset water temperature change requirement according to the water temperature change rate includes: Calculate the preset water temperature change rate according to the detection period; wherein the preset water temperature change rate △T0=b / detection period, b is the preset difference; Determine whether the water temperature change rate of the chilled water outlet temperature is less than or equal to the preset water temperature change rate. If so, determine that the water temperature change rate meets the preset water temperature change requirement. If not, determine that the water temperature change rate does not meet the preset water temperature change requirement.

13. The method according to claim 10, characterized in that If not, the water temperature change rate is adjusted, including: If it is not satisfied, the operating frequency of the unit is reduced to adjust the water temperature change rate.

14. A unit load control device, characterized in that: The device comprises: The first adjustment module is used to determine whether the total time required for the unit to start up and run to full load frequency meets the preset time requirement according to the actual operating frequency and loading parameters of the unit after the unit is started, and adjust the loading parameters if it does not meet the preset time requirement; The second adjustment module is used to obtain the COP of the unit and determine whether the COP of the unit meets the preset performance requirements; if not, adjust the opening of the electronic expansion valve of the unit; if the opening of the electronic expansion valve is to be reduced, determine whether to continue or stop the adjustment according to the change of the evaporation temperature.

15. The device according to claim 14, characterized in that The device also includes: The third adjustment module is used to detect the water temperature change rate of the chilled water outlet temperature of the unit; determine whether the unit operation status meets the preset water temperature change requirement based on the water temperature change rate, and adjust the water temperature change rate if it does not meet the requirement.

16. An air conditioning device, characterized in that: The air conditioning equipment includes the unit load control device according to claim 14 or 15.

17. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 13 is implemented.

Images