Air conditioning system and control method thereof

Abstract

The application discloses an air conditioning system and a control method thereof. The control method of the air conditioning system comprises the following steps: monitoring a current indoor temperature value of a room; if the current indoor temperature value deviates from a corresponding design temperature and is within a corresponding comfort temperature range, calculating a change rate of the indoor temperature value; meanwhile, predicting a future indoor temperature value of the room; if the future indoor temperature value is determined to exceed the corresponding comfort range of the room within a preset time based on the change rate of the indoor temperature value, calculating a thermal inertia response time; multiplying the change rate of the indoor temperature value by the thermal inertia response time to obtain a response temperature difference value; finding the earliest temperature node in the future indoor temperature value, which is superimposed with the corresponding response temperature difference value and exceeds the corresponding comfort temperature range of the room, and performing corresponding control on a corresponding valve of the air conditioner when the indoor temperature value reaches the temperature node. The application can effectively utilize thermal inertia, perform control in advance and avoid control delay caused by thermal inertia.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioner control, in particular to a control method of an air conditioner system capable of eliminating the influence of thermal inertia. BACKGROUND

[0002] The existing air conditioner system usually controls various valves according to the indoor environment temperature and the outdoor environment temperature, but the building actually has certain thermal inertia, and the existing air conditioner system does not process the thermal inertia effect of the building, resulting in a certain delay in reaching the corresponding temperature of the indoor temperature.

[0003] Especially for the radiant air conditioner system, the radiant air conditioner system uses water as the refrigerant carrier and performs radiation heat transfer through the uniformly close capillary tube seat or water disc pipe buried in the building. Since the heat conduction of the radiant air conditioner system needs to pass through the building and then exchange heat with the indoor air, the thermal inertia of the radiant air conditioner system is large.

[0004] In the existing radiant air conditioner system, if the conventional way is adopted to directly control the simple opening or closing of the water distributor and collector valves, due to the large thermal inertia of the system, the system has high delay and large temperature change range. If the conventional PID control is adopted, although the gradual increase or decrease control of the temperature can be realized, the PID control is slow, especially for large inertia systems, which has the disadvantages of slow adjustment and long adjustment period. The parameter setting easily leads to integral saturation phenomenon, so that the final adjustment mode becomes on-off control mode.

[0005] Therefore, how to perform early control, eliminate the interference of thermal inertia on temperature accurate control, and reduce the target temperature change range is a difficult problem to be solved at present. SUMMARY

[0006] In order to solve the technical problem of the influence of thermal inertia caused by the building on the temperature control of the air conditioner system in the prior art, the present application provides an air conditioner system and a control method thereof.

[0007] The control method of the air conditioner system provided by the present application comprises:

[0008] monitoring the current indoor temperature value of the room;

[0009] if the current indoor temperature value of the room deviates from the corresponding design temperature and is within the corresponding comfort temperature range of the room, calculating the change rate of the corresponding indoor temperature value of the room, and simultaneously predicting the future indoor temperature value of the room through the corresponding load prediction model of the room;

[0010] If it is determined that the future indoor temperature value will exceed the corresponding comfort range of the room within the preset time based on the rate of change of the indoor temperature value, a thermal inertia response time corresponding to the future indoor temperature value is calculated according to the operating parameters of the air conditioner;

[0011] The rate of change of the indoor temperature value is multiplied by the thermal inertia response time to obtain a response temperature difference value;

[0012] The earliest temperature node in the future indoor temperature value at which the influence of the corresponding response temperature difference value exceeds the corresponding comfort temperature range of the room is found, and the corresponding valve of the air conditioner is controlled accordingly when the indoor temperature value reaches the temperature node.

[0013] Further, if the current indoor temperature value of the room is greater than the corresponding design temperature and less than or equal to the maximum value of the corresponding comfort temperature range, the rate of change of the indoor temperature value is determined. If the rate of change of the indoor temperature value is greater than 0, it is determined that the future indoor temperature value will be greater than the maximum value of the corresponding comfort range of the room within the preset time, otherwise it is determined that the future indoor temperature value will not exceed the corresponding comfort range of the room within the preset time.

[0014] Further, when the air conditioner is in cooling mode, if the current indoor temperature value of the room is greater than the corresponding design temperature and less than or equal to the maximum value of the corresponding comfort temperature range, if it is determined that the future indoor temperature value will not exceed the corresponding comfort range of the room within the preset time, it is determined whether the absolute value of the rate of change of the indoor temperature value is greater than the absolute value of the preset rate. If yes, the corresponding valve is controlled to be closed or closed small, otherwise the current indoor temperature value is continuously monitored. If the current indoor temperature value is greater than the maximum value of the adjustment temperature range of the room, the corresponding valve is controlled to be opened or opened large, otherwise the corresponding valve is controlled to be closed or closed small.

[0015] Further, when the air conditioner is in heating mode, if the current indoor temperature value of the room is greater than the corresponding design temperature and less than or equal to the maximum value of the corresponding comfort temperature range, if it is determined that the future indoor temperature value will not exceed the corresponding comfort range of the room within the preset time, it is determined whether the absolute value of the rate of change of the indoor temperature value is greater than the absolute value of the preset rate. If yes, the corresponding valve is controlled to be opened or opened large, otherwise the current indoor temperature value is continuously monitored. If the current indoor temperature value is greater than the maximum value of the adjustment temperature range of the room, the corresponding valve is controlled to be closed or closed small, otherwise the corresponding valve is controlled to be opened or opened large.

[0016] Further, if the current indoor temperature value of the room is less than the corresponding design temperature and greater than or equal to the minimum value of the corresponding comfort temperature range, the rate of change of the indoor temperature value is determined. If the rate of change of the indoor temperature value is less than 0, it is determined that the future indoor temperature value will be less than the minimum value of the comfort range of the room within a preset time, otherwise it is determined that the future indoor temperature value will not exceed the comfort range of the room within a preset time.

[0017] Further, when the air conditioner is in cooling mode, if the current indoor temperature value of the room is less than the corresponding design temperature and greater than or equal to the minimum value of the corresponding comfort temperature range, if it is determined that the future indoor temperature value will not exceed the comfort range of the room within a preset time, it is determined whether the absolute value of the rate of change of the indoor temperature value is greater than the absolute value of the preset rate. If yes, the corresponding valve is controlled to open or open wide, otherwise, the current indoor temperature value is continuously monitored. If the current indoor temperature value is less than the minimum value of the adjustment temperature range of the room, the corresponding valve is controlled to close or close small, otherwise the corresponding valve is controlled to open or open wide.

[0018] Further, when the air conditioner is in cooling mode, if the current indoor temperature value of the room is less than the corresponding design temperature and greater than or equal to the minimum value of the corresponding comfort temperature range, if it is determined that the future indoor temperature value will not exceed the comfort range of the room within a preset time, it is determined whether the absolute value of the rate of change of the indoor temperature value is greater than the absolute value of the preset rate. If yes, the corresponding valve is controlled to open or open wide, otherwise, the current indoor temperature value is continuously monitored. If the current indoor temperature value is less than the minimum value of the adjustment temperature range of the room, the corresponding valve is controlled to close or close small, otherwise the corresponding valve is controlled to open or open wide.

[0019] Further, if the air conditioner is in cooling mode and it is determined that the future indoor temperature value will be greater than the maximum value of the comfort temperature range of the room within a preset time,

[0020] The future indoor temperature value is found according to the inequality Tc-tk*tx>T0+Δt1, which has a greater influence than the maximum value of the comfort temperature range of the room. When the indoor temperature value reaches the temperature node, the corresponding valve is controlled to open or open wide.

[0021] The Tc is the future indoor temperature value, tk is the rate of change of the indoor temperature value of the corresponding room, tx is the thermal inertia response time corresponding to the future indoor temperature value, T0 is the design temperature of the corresponding room, and Δt1 is the absolute value of the difference between the maximum value of the comfort temperature range of the corresponding room and the design temperature of the room.

[0022] Further, if the air conditioner is in cooling mode, and it is determined that the future indoor temperature value will be less than the minimum value of the comfort range of the room within a preset time;

[0023] The earliest temperature node in which the influence of the superimposed response temperature difference in the future indoor temperature value is less than the minimum value of the comfort temperature range of the room is found according to the inequality Tc-tk*tx

[0024] The Tc is the future indoor temperature value, tk is the change rate of the indoor temperature value of the corresponding room, tx is the thermal inertia response time corresponding to the future indoor temperature value, T0 is the design temperature of the corresponding room, and Δt1 is the absolute value of the difference between the minimum value of the comfort temperature range of the corresponding room temperature and the design temperature of the room.

[0025] Further, if the air conditioner is in heating mode, and it is determined that the future indoor temperature value will be greater than the maximum value of the comfort range of the room within a preset time;

[0026] The earliest temperature node in which the influence of the superimposed response temperature difference in the future indoor temperature value is greater than the maximum value of the comfort temperature range of the room is found according to the inequality Tc-tk*tx

[0027] The Tc is the future indoor temperature value, tk is the change rate of the indoor temperature value of the corresponding room, tx is the thermal inertia response time corresponding to the future indoor temperature value, T0 is the design temperature of the corresponding room, and Δt1 is the absolute value of the difference between the minimum value of the comfort temperature range of the corresponding room temperature and the design temperature of the room.

[0028] Further, if the air conditioner is in heating mode, and it is determined that the future indoor temperature value will be less than the minimum value of the comfort range of the room within a preset time;

[0029] The earliest temperature node in which the influence of the superimposed response temperature difference in the future indoor temperature value is less than the minimum value of the comfort temperature range of the room is found according to the inequality Tc-tk*tx

[0030] The Tc is the future indoor temperature value, tk is the change rate of the indoor temperature value of the corresponding room, tx is the thermal inertia response time corresponding to the future indoor temperature value, T0 is the design temperature of the corresponding room, and Δt1 is the absolute value of the difference between the minimum value of the comfort temperature range of the corresponding room temperature and the design temperature of the room.

[0031] Further, before judging whether the current indoor temperature value of the room meets the design temperature corresponding to the room, it is judged whether the current indoor temperature value exceeds the corresponding comfort temperature range, if yes, the corresponding valve of the air conditioner is directly controlled accordingly, otherwise, it is judged whether the current indoor temperature value of the room meets the design temperature corresponding to the room.

[0032] Further, when the air conditioner is in cooling mode, before judging whether the current indoor temperature value of the room meets the design temperature corresponding to the room, if the current indoor temperature value is greater than the maximum value of the corresponding comfort temperature range, the corresponding valve of the air conditioner is controlled to open or open widely, if the current indoor temperature value is less than the minimum value of the corresponding comfort temperature range, the corresponding valve of the air conditioner is controlled to close or close narrowly.

[0033] Further, when the air conditioner is in heating mode, before judging whether the current indoor temperature value of the room meets the design temperature corresponding to the room, if the current indoor temperature value is greater than the maximum value of the corresponding comfort temperature range, the corresponding valve of the air conditioner is controlled to close or close narrowly, if the current indoor temperature value is less than the minimum value of the corresponding comfort temperature range, the corresponding valve of the air conditioner is controlled to open or open widely.

[0034] Further, the thermal inertia response time is calculated by the formula t x = At g + BT c + C; wherein t x is the thermal inertia response time, t g is the chilled water supply temperature of the air conditioner, T c is the future indoor temperature value, and A, B and C are coefficients.

[0035] Further, the corresponding comfort temperature range of the room is calculated by the formula ; wherein PMV is a comfort index, M is a human metabolic rate, t r is the average skin temperature of a human body in a comfortable state, Ta is the current indoor temperature value of the room where the human body is located, and t cl is the thermal resistance of the clothes worn by the human body.

[0036] Further, the load prediction model corresponding to the room includes an external wall heat transfer model, a roof radiation heat transfer model, an indoor air heat exchange model, an internal wall heat transfer model and a floor heat exchange model.

[0037] The air conditioning system provided by the application comprises a controller, and the controller controls the air conditioner by using the air conditioning control method described above.

[0038] Further, the air conditioning system is a radiant air conditioning system.

[0039] The present application is based on load prediction technology, combined with a simplified grey box model (load prediction model) in the room, which can accurately predict the indoor temperature value at a certain time in the future, and determine the reasonable range of indoor temperature based on the thermal comfort PMV index, and fit the thermal inertia delay time mathematical model based on historical data, and calculate the thermal inertia response time. The change rate of the indoor temperature value before the current indoor temperature value is combined to determine the size, and the control of the corresponding valve is performed in advance, such as the on-off control of the valve of the water distributor and the water collector. The present application can effectively reduce the indoor temperature change range and has a leading control effect, effectively avoiding the problems of slow system response and low indoor comfort caused by large thermal inertia. BRIEF DESCRIPTION OF DRAWINGS

[0040] The present application will be described in further detail below in conjunction with the embodiments and drawings, in which:

[0041] Figure 1 is the overall flowchart of an embodiment of the present application.

[0042] Figure 2 is the control flowchart of the refrigeration mode of an embodiment of the present application.

[0043] Figure 3 is the load prediction model of an embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to make the technical problems to be solved by the present application, the technical solutions and the beneficial effects more clearly understood, the present application will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0045] Therefore, one feature indicated in the specification will be used to explain one feature of one embodiment of the present application, and it is not implied that each embodiment of the present application must have the explained feature. In addition, it should be noted that the present specification describes many features. Although certain features can be combined together to show possible system designs, these features can also be used in other combinations that are not explicitly described. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0046] The control method of the air conditioning system of the present application mainly aims at predicting the influence of thermal inertia and thus performing control in advance to avoid fluctuations in the target temperature in a large range and improve the control accuracy of the air conditioner on the target air conditioner.

[0047] As shown in Figure 1 in one embodiment, the control method of the air conditioning system of the present application includes the following main steps.

[0048] Monitor the current indoor temperature value Ti of the room.

[0049] If the current indoor temperature value Ti of the room deviates from the corresponding design temperature T0, and is within the corresponding comfort temperature range [T0-Δt1, T0+Δt1] of the room, i.e., Ti≠T0, T0-Δt1≤Ti≤T0+Δt1, the change rate tk of the corresponding indoor temperature value of the room is calculated; at the same time, the future indoor temperature value Tc of the room is predicted through the corresponding load prediction model of the room.

[0050] If it is determined based on the change rate of the indoor temperature value that the future indoor temperature value will exceed the corresponding comfort range of the room within a preset time, the thermal inertia response time corresponding to the future indoor temperature value is calculated according to the operating parameters of the air conditioner.

[0051] The change rate of the indoor temperature value is multiplied by the thermal inertia response time to obtain a response temperature difference value.

[0052] The earliest temperature node in the future indoor temperature value at which the influence of superimposing the corresponding response temperature difference value exceeds the corresponding comfort temperature range of the room is found, and the corresponding valve of the air conditioner is controlled when the indoor temperature value reaches the temperature node.

[0053] The present application considers the influence of thermal inertia when the room is within the comfort temperature range, and if it is determined that the future indoor temperature value superimposes the corresponding response temperature difference value and exceeds the corresponding comfort temperature range of the room (for example, greater than the maximum value of the comfort temperature range or less than the minimum value of the comfort temperature), the present application finds the earliest temperature node in the predicted future indoor temperature value, at which the indoor temperature value is still within the comfort temperature range, but if no control measures are taken, the indoor temperature value will exceed the comfort temperature range due to the influence of thermal inertia, so control measures are taken at this temperature node to stabilize the indoor temperature value within the comfort temperature range and avoid excessive changes in the indoor temperature value due to the influence of thermal inertia.

[0054] The design temperature of the room of the present application refers to a temperature that is designed according to the conditions of the building and is comfortable for the human body, for example, for some buildings, the design temperature of the room in summer is 26℃, and the design temperature of the room in winter is 20℃. When the temperature value in the room reaches the corresponding design temperature in the corresponding season, the temperature of the room reaches a temperature that is comfortable for the human body. The examples here are only to make the invention concept of the present application clearer, and for actual application, different rooms have different design temperatures due to different building materials and interior decorations.

[0055] When the indoor temperature is based on a fixed comfortable temperature value, there are some temperature deviations up and down, and the whole is also comfortable for human body feeling. Thus the comfort temperature range of the room of the present application refers to a temperature range fluctuating up and down around the design temperature of the room as the comfort temperature range calculated by some established comfort indexes based on the design temperature.

[0056] In a specific embodiment, the comfort range can be obtained by the PWV index, and whether the air temperature in the room is in the comfort space of human body is judged by the PMV index. The first level standard of PMV is between ±0.5, i.e. PMV=0.5 or -0.5. The second level standard of PMV is between ±1, i.e. PMV=1 or -1. The calculation formula of the PMV index is:

[0057]

[0058] In the above formula, M is the metabolic rate of human body; t r is the average temperature of human body skin in the comfortable state; Ta is the ambient temperature of human body, and tcl is the thermal resistance of clothing.

[0059] The present application can predict the load of the room at a certain time in the future and the future indoor temperature value of the room by the load prediction model corresponding to the room, calculate the inertia buffer time based on the linear regression equation of thermal inertia, and thus perform the advanced response control of the radiation system, adjust the valve opening and closing by the characteristics of thermal inertia, and achieve the purpose of adjusting the indoor temperature. Meanwhile, the temperature in the room can be dynamically adjusted by the PMV comfort evaluation index, so that each room is always in the comfort zone.

[0060] In an embodiment, when the air conditioning system of the present application is a radiation air conditioning system, the thermal inertia response time of the present application is calculated by the formula t x =At g +BT c +C. t x is the thermal inertia response time, t g is the chilled water supply temperature of the air conditioner, T c is the future indoor temperature value, and A, B and C are coefficients.

[0061] In one embodiment, if the current indoor temperature value of the room is greater than the corresponding design temperature and less than or equal to the maximum value of the corresponding comfort temperature range, it is necessary to determine the rate of change of the indoor temperature value. If the rate of change of the indoor temperature value is greater than 0, it indicates that the temperature is rising at this time, and it is determined that the future indoor temperature value will be greater than the maximum value of the corresponding comfort range of the room within a preset time, i.e., the air conditioning system needs to be controlled in advance. If the rate of change of the indoor temperature value is less than or equal to 0, it indicates that the temperature in the room remains unchanged or is decreasing, and it is determined that the future indoor temperature value will not exceed the corresponding comfort range of the room within a preset time, so the air conditioning system does not need to be controlled in advance.

[0062] In a further embodiment, when the air conditioner is in cooling mode, if the current indoor temperature value of the room is greater than the corresponding design temperature and less than or equal to the maximum value of the corresponding comfort temperature range, if it is determined that the future indoor temperature value will not exceed the corresponding comfort range of the room within a preset time, i.e., the temperature in the room is decreasing at this time, it is determined whether the absolute value of the rate of change of the indoor temperature value is greater than the absolute value of the preset rate. If it is greater than the absolute value of the preset rate, the corresponding valve is controlled to be closed or smaller. If it is less than or equal to the absolute value of the preset rate, the current indoor temperature value is continuously monitored (the current indoor temperature value still satisfies being greater than the corresponding design temperature and less than or equal to the maximum value of the corresponding comfort temperature range). If the current indoor temperature value is greater than the maximum value of the adjustment temperature range of the room, it indicates that the temperature in the room is decreasing slowly, and the corresponding valve is controlled to be opened or larger. If the current indoor temperature value is less than or equal to the maximum value of the adjustment temperature range of the room, the corresponding valve is controlled to be closed or smaller.

[0063] In another further embodiment, when the air conditioner is in heating mode, if the current indoor temperature value of the room is greater than the corresponding design temperature and less than or equal to the maximum value of the corresponding comfort temperature range, if it is determined that the future indoor temperature value will not exceed the corresponding comfort range of the room within a preset time, i.e., the temperature in the room is decreasing at this time, it is determined whether the absolute value of the rate of change of the indoor temperature value is greater than the absolute value of the preset rate. If it is greater than the absolute value of the preset rate, it indicates that the temperature is decreasing relatively fast, and the corresponding valve is controlled to be opened or larger. If the absolute value of the rate of change of the indoor temperature value is less than or equal to the absolute value of the preset rate, the current indoor temperature value is continuously monitored (the current indoor temperature value still satisfies being greater than the corresponding design temperature and less than or equal to the maximum value of the corresponding comfort temperature range). If the current indoor temperature value is greater than the maximum value of the adjustment temperature range of the room, the corresponding valve is controlled to be closed or smaller. If the current indoor temperature value is less than or equal to the maximum value of the adjustment temperature range of the room, the corresponding valve is controlled to be opened or larger.

[0064] In another aspect, if the current indoor temperature value of the room is less than the corresponding design temperature, while greater than or equal to the minimum value of the corresponding comfort temperature range, the rate of change of the indoor temperature value is also determined. If the rate of change of the indoor temperature value is less than 0, it indicates that the temperature is still falling, and it is determined that the future indoor temperature value will be less than the minimum value of the corresponding comfort range of the room within a preset time, and early control is needed. If the rate of change of the indoor temperature value is greater than or equal to 0, it indicates that the temperature is rising or remaining unchanged, and it is determined that the future indoor temperature value will not exceed the corresponding comfort range of the room within a preset time.

[0065] In a further embodiment, when the air conditioner is in cooling mode, if the current indoor temperature value of the room is less than the corresponding design temperature, while greater than or equal to the minimum value of the corresponding comfort temperature range, if it is determined that the future indoor temperature value will not exceed the corresponding comfort range of the room within a preset time, i.e. the rate of change of the indoor temperature value is greater than or equal to 0, it is further determined whether the absolute value of the rate of change of the indoor temperature value is greater than the absolute value of the preset rate. If yes, the corresponding valve is controlled to open or open more, otherwise, the current indoor temperature value is continuously monitored (at this time, the current indoor temperature value still satisfies less than the corresponding design temperature, while greater than or equal to the minimum value of the corresponding comfort temperature range), if the current indoor temperature value is less than the minimum value of the adjustment temperature range of the room, the corresponding valve is controlled to close or close less, otherwise the corresponding valve is controlled to open or open more.

[0066] Similarly, when the air conditioner is in heating mode, if the current indoor temperature value of the room is less than the corresponding design temperature, while greater than or equal to the minimum value of the corresponding comfort temperature range, if it is determined that the future indoor temperature value will not exceed the corresponding comfort range of the room within a preset time, it is determined whether the absolute value of the rate of change of the indoor temperature value is greater than the absolute value of the preset rate. If yes, it indicates that the temperature rises faster, and the corresponding valve is controlled to close or close less, otherwise, the current indoor temperature value is continuously monitored (at this time, the current indoor temperature value still satisfies less than the corresponding design temperature, while greater than or equal to the minimum value of the corresponding comfort temperature range), if the current indoor temperature value is less than the minimum value of the adjustment temperature range of the room, the corresponding valve is controlled to open or open more, otherwise the corresponding valve is controlled to close or close less.

[0067] The present application does not limit the specific value of the preset time in the above steps. In fact, in the control process of the air conditioning system, the indoor temperature value will fluctuate, and generally within a fluctuation period, or more precisely within the time range of a wave crest or a wave trough, whether it will cause the current indoor temperature value to exceed the comfort temperature range, if so, early control is needed.

[0068] In one embodiment, if the air conditioner is in cooling mode, and it is determined that the future indoor temperature value will be greater than the maximum value of the comfort temperature range of the corresponding room within a preset time; that is, the current indoor temperature value is greater than the design temperature, and is less than or equal to the maximum value of the comfort temperature range. The rate of change of the indoor temperature value is greater than 0. According to the inequality Tc-tk*tx>T0+Δt1, the earliest temperature node at which the influence of the superimposed response temperature difference in the future indoor temperature value is greater than the maximum value of the comfort temperature range of the room is found, and the corresponding valve is controlled to be opened or opened wide when the indoor temperature value reaches the temperature node.

[0069] wherein Tc is the future indoor temperature value, tk is the rate of change of the indoor temperature value of the corresponding room, tx is the thermal inertia response time corresponding to the future indoor temperature value, T0 is the design temperature of the corresponding room, and Δt1 is the absolute value of the difference between the maximum value of the comfort temperature range of the corresponding room temperature and the design temperature of the room.

[0070] In one embodiment, if the air conditioner is in cooling mode, and it is determined that the future indoor temperature value will be less than the minimum value of the comfort temperature range of the corresponding room within a preset time; that is, the current indoor temperature value is less than the design temperature, and is greater than or equal to the minimum value of the comfort temperature range. The rate of change of the indoor temperature value is less than 0, and the temperature in the room is still decreasing. According to the inequality Tc-tk*tx

[0071] wherein Tc is the future indoor temperature value, tk is the rate of change of the indoor temperature value of the corresponding room, tx is the thermal inertia response time corresponding to the future indoor temperature value, T0 is the design temperature of the corresponding room, and Δt1 is the absolute value of the difference between the minimum value of the comfort temperature range of the corresponding room temperature and the design temperature of the room.

[0072] In one embodiment, if the air conditioner is in heating mode, and it is determined that the future indoor temperature value will be greater than the maximum value of the comfort temperature range of the corresponding room within a preset time; according to the inequality Tc-tk*tx>T0+Δt1, the earliest temperature node at which the influence of the superimposed response temperature difference in the future indoor temperature value is greater than the maximum value of the comfort temperature range of the room is found, and the corresponding valve is controlled to be closed or closed small when the indoor temperature value reaches the temperature node.

[0073] wherein Tc is the future indoor temperature value, tk is the rate of change of the indoor temperature value of the corresponding room, tx is the thermal inertia response time corresponding to the future indoor temperature value, T0 is the design temperature of the corresponding room, and Δt1 is the absolute value of the difference between the minimum value of the comfort temperature range of the corresponding room temperature and the design temperature of the room.

[0074] In one embodiment, if the air conditioner is in heating mode, and it is determined that the future indoor temperature value will be less than the minimum value of the comfort temperature range of the room within a preset time, the earliest temperature node in which the influence of the superimposed response temperature difference on the future indoor temperature value is less than the minimum value of the comfort temperature range of the room is found according to the inequality Tc-tk*tx

[0075] wherein Tc is the future indoor temperature value, tk is the change rate of the indoor temperature value of the corresponding room, tx is the thermal inertia response time corresponding to the future indoor temperature value, T0 is the design temperature of the corresponding room, and Δt1 is the absolute value of the difference between the minimum value of the comfort temperature range of the corresponding room and the design temperature of the room.

[0076] In the above steps, the present application needs to calculate the thermal inertia response time corresponding to the future indoor temperature value. Since the future indoor temperature value predicted by the load prediction model corresponding to the room is not a single value, but a plurality of future indoor temperature values corresponding to a plurality of time nodes, in order to reduce the calculation amount, the time interval of each time node can be adjusted, or the prediction time is shortened, for example, only the future indoor temperature value within the next two hours is predicted, and the time interval between each future indoor temperature value is 15 minutes. Then, under the condition of keeping the current control unchanged, the earliest future indoor temperature value is calculated from the earliest future indoor temperature value, until the earliest future indoor temperature value which is superimposed with the thermal inertia influence and causes the subsequent indoor temperature value to exceed the comfort temperature range is found as the temperature node, and the valve of the air conditioner is controlled accordingly when the temperature node arrives, thereby effectively utilizing the thermal inertia and avoiding the adverse effects of thermal inertia on the indoor temperature value.

[0077] In a further embodiment, before determining whether the current indoor temperature value of the room meets the design temperature corresponding to the room, it can be determined whether the current indoor temperature value exceeds the corresponding comfort temperature range, for example, the current indoor temperature value is greater than the maximum value of the comfort temperature range, or the current indoor temperature value is less than the minimum value of the comfort temperature range. If it is any one of the two cases, the corresponding valve of the air conditioner is directly controlled accordingly, otherwise the step of determining whether the current indoor temperature value of the room meets the design temperature corresponding to the room is entered.

[0078] When the air conditioner is in cooling mode, before determining whether the current indoor temperature value of the room meets the design temperature corresponding to the room, if the current indoor temperature value is greater than the maximum value of the corresponding comfort temperature range, the corresponding valve of the air conditioner is controlled to open or open wide; if the current indoor temperature value is less than the minimum value of the corresponding comfort temperature range, the corresponding valve of the air conditioner is controlled to close or close small.

[0079] When the air conditioner is in the heating mode, before determining whether the current indoor temperature value of the room meets the designed temperature corresponding to the room, if the current indoor temperature value is greater than the maximum value of the corresponding comfort temperature range, control the corresponding valve of the air conditioner to close or reduce its opening; if the current indoor temperature value is less than the minimum value of the corresponding comfort temperature range, control the corresponding valve of the air conditioner to open or increase its opening.

[0080] As Figure 2 shown, the following takes the cooling mode of the radiant air-conditioning system as an example to illustrate the process of the present invention.

[0081] Monitor the current indoor temperature value Ti of the room, and at the same time predict the future indoor temperature value Tc, and calculate the change rate tk of the indoor temperature value. The order of predicting the future indoor temperature value and calculating the change rate can be swapped without affecting the final control result.

[0082] Judge whether the current indoor temperature value exceeds the maximum value of the comfort temperature range. If Ti>T0+△t1 is satisfied, control the actuator to open. If not, continue to judge whether the current indoor temperature value exceeds the minimum value of the comfort temperature range. If Ti<T0-△t1 is satisfied, control the actuator to close. The order of judging the maximum and minimum values of the current indoor temperature value and the comfort temperature range can be swapped arbitrarily without affecting the final control result.

[0083] If T0+△t1≤Ti≤T0+△t1 is satisfied, then judge whether Ti is greater than T0. If satisfied, that is, T0<Ti≤T0+△t1, judge whether the temperature in the room is continuously rising, that is, judge whether tk is greater than 0. If tk>0, calculate the temperature node for advance control through the thermal inertia response time, etc., and when the corresponding temperature node arrives, control the actuator to open in advance. If tk≤0, it means that when Ti is higher than T0, the temperature in the room is decreasing or remaining unchanged. Judge whether the absolute value of the change rate tk of the indoor temperature value is greater than the absolute value of the preset rate, that is, Abs(tk*K1), K1>1. If it is greater, it means that the temperature is decreasing rapidly, then control the actuator to close. Otherwise, it means that the temperature is not decreasing rapidly. Check whether the current indoor temperature value is greater than the maximum value of the adjustment temperature range. If it is greater, open the actuator, otherwise close the actuator.

[0084] If Ti is less than T0, that is, T0-△t1≤Ti<T0, judge whether the temperature Buddha If tk is less than 0, the temperature node of the advance control is calculated through the thermal inertia response time, and when the corresponding temperature node arrives, the advance control executes the actuator to close. If tk is greater than or equal to 0, it indicates that the current indoor temperature value is below T0, and the temperature of the room is rising or unchanged. Then, it is determined whether the absolute value of the rate of change of the indoor temperature value tk is greater than the absolute value of the preset rate, that is, Abs(tk*K1), K1>1. If it is greater, it indicates that the temperature rises faster, and the actuator is opened. Otherwise, it indicates that the temperature does not rise fast, and it is determined whether the current indoor temperature value is less than the minimum value of the adjustment temperature range. If it is less, the actuator is closed. Otherwise, the actuator is opened.

[0085] If Ti is equal to T0, no control is needed.

[0086] The related principles and formulas of the load prediction model corresponding to the room of the present application are described below.

[0087] In one embodiment, the load prediction model corresponding to the room includes an external wall heat transfer model, a roof radiation heat transfer model, an indoor air heat exchange model, an internal wall heat transfer model, and a floor heat exchange model.

[0088] The load prediction model corresponding to the room needs to collect a large number of data sets for training, so as to be able to predict accurate future indoor temperature values.

[0089] Taking a radiant air conditioning system as an example, the data required for training the model includes outdoor dry bulb temperature Toa, outdoor relative humidity RHTo, indoor dry bulb temperature Tia, air dew point temperature Ti, indoor relative humidity RHi, indoor relative humidity set value RH0, cold and heat source water supply temperature Tg, cold and heat source return water temperature Th, floor surface temperature Td, room flow G, weather data, meteorological data, etc.

[0090] The meteorological data includes data that can be represented by (0, 1, 2, 3, 4, 5…) int type data, such as (no wind, light wind, wind, strong wind, typhoon…) etc.

[0091] The weather data includes data that can be represented by (0, 1, 2, 3, 4, 5, 6…) int type data, such as (sunny, cloudy, cloudy, light rain, heavy rain, light snow, heavy snow…) etc.

[0092] The data required for training the model is preprocessed first, including but not limited to filling in missing values, correcting error values, changing data formats, changing file formats, etc. The Bi-LSTM neural network model can be used for training, or other models can be used for training.

[0093] Then, the error calculation analysis is performed to obtain the training set error Δx and the test set error Δc, so as to determine whether overfitting or gradient explosion exists in the training, and if so, the model is optimized, otherwise, the load prediction model corresponding to the room is output.

[0094] The input data (such as outdoor dry bulb humidity, weather data, etc.) in a time period of ΔT from the current time to a past time are input, the load demand, water temperature and floor surface temperature in a future time period are predicted, and the load prediction result, i.e. the future indoor temperature value of the room, is output.

[0095] As shown in Figure 3 , the load prediction model of the whole room is simplified into five heat transfer models, i.e. an outer wall heat transfer model (formula 1), a roof radiation heat transfer model (formula 2), an indoor air heat exchange model (formula 3), an inner wall heat transfer model (formula 4) and a floor heat exchange model (formula 5), wherein the energy conservation equation of the whole room is as follows:

[0096]

[0097]

[0098]

[0099]

[0100]

[0101] Q s,w = αI S A w (6)

[0102] Q s,r = βI S A r (7)

[0103] Q s,i = γI s A i (8)

[0104] Q s,f = εI s A f (9)

[0105] Q s,d = acm d (t g -t h ) (10)

[0106] Q wind = m s [(h a -hs )-(rd a -rd s )] (11)

[0107] In the above formula, T O , T w , T f , T r , T a , T I are the outside surface temperature of the external wall, the inside surface temperature of the external wall, the surface temperature of the floor, the surface temperature of the radiant ceiling, the indoor air temperature (i.e. the predicted future indoor temperature value), the inside surface temperature of the internal wall, respectively, in ℃.

[0108] C w , C r , C a , C I , C f are the thermal capacity of the external wall, the thermal capacity of the radiant ceiling, the thermal capacity of the indoor air, the thermal capacity of the internal wall, the thermal capacity of the floor, respectively, in J / K.

[0109] R w,o , R w,f , R w,r , R w,a , R r,a , R I,a , R f,a , R r,i , R f,i are the thermal resistance of the external wall to outdoor air, the thermal resistance of the external wall to the radiant heat exchange with the floor, the thermal resistance of the external wall to the radiant heat exchange with the radiant ceiling, the thermal resistance of the external wall to the indoor air, the thermal resistance of the radiant floor to the indoor air, the thermal resistance of the internal wall to the indoor air, the thermal resistance of the floor to the indoor air, the thermal resistance of the internal wall to the radiant ceiling, the thermal resistance of the internal wall to the radiant heat exchange with the floor, respectively, in K / w.

[0110] Q s,w , Q s,r , Q s,i , Q s,f , Q s,r , Q s,d , Q wind , Q inter are the solar radiation heat absorbed by the external wall, the solar radiation heat of the floor system, the solar radiation heat absorbed by the internal wall, the solar radiation heat absorbed by the radiant ceiling, the cooling capacity of the radiant ceiling, the sensible heat load of the fresh air, the heat dissipation of the internal heat source, respectively, in W.

[0111] α, β, γ, ε, a are the heat gain coefficient of the external wall to solar radiation, the heat gain coefficient of the radiant ceiling to solar radiation, the heat gain coefficient of the internal wall to solar radiation, the heat gain coefficient of the floor to solar radiation, the cooling coefficient of the radiant ceiling to the radiant chilled water, respectively.

[0112] A w 、A r 、A i 、A f respectively are the area of the outer wall, the area of the radiant ceiling, the area of the inner wall, the area of the floor, and the unit is m2.

[0113] c is the specific heat capacity of water, the unit is J / (kg·K), m d is the chilled water flow of the radiant panel, the unit is kg / s, t g , t h respectively are the chilled water supply temperature, the chilled water return temperature, the unit is ℃; m s is the fresh air flow, the unit is kg / h; hs, ha respectively are the supply air enthalpy, the indoor air enthalpy, the unit is kj / kg.

[0114] ds, da respectively are the supply air humidity, the indoor air humidity, the unit is kg / kg; r is the latent heat of vaporization, the unit is kj / kg.

[0115] The air conditioning system of the present application comprises a controller, wherein the controller controls the air conditioner by using the air conditioning control method of the above technical solution.

[0116] The air conditioning system of the present application includes but is not limited to a radiant air conditioning system.

[0117] If it is a radiant air conditioning system, the present application mainly performs opening or closing operation on the corresponding valve through the actuator when controlling the corresponding valve. For other types of air conditioning systems, the corresponding valve is operated according to the specific situation.

[0118] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control method of an air conditioning system, characterized by, The method comprises the following steps: monitoring a current indoor temperature value of a room; if the current indoor temperature value of the room deviates from a corresponding design temperature and is within a corresponding comfort temperature range of the room, calculating a change rate of the corresponding indoor temperature value of the room, and predicting a future indoor temperature value of the room through a corresponding load prediction model of the room; if it is determined that the future indoor temperature value will exceed the corresponding comfort temperature range of the room within a preset time based on the change rate of the indoor temperature value, calculating a thermal inertia response time corresponding to the future indoor temperature value according to an operating parameter of an air conditioner; multiplying the change rate of the indoor temperature value by the thermal inertia response time to obtain a response temperature difference value; finding the earliest temperature node in the future indoor temperature value at which the influence of the corresponding response temperature difference value exceeds the corresponding comfort temperature range of the room, and performing corresponding control on a corresponding valve of the air conditioner when the indoor temperature value reaches the temperature node.

2. The control method of the air conditioning system of claim 1, wherein, if the current indoor temperature value of the room is greater than the corresponding design temperature and is less than or equal to a maximum value of the corresponding comfort temperature range, determining the change rate of the indoor temperature value, and if the change rate of the indoor temperature value is greater than 0, determining that the future indoor temperature value will be greater than the maximum value of the corresponding comfort temperature range of the room within a preset time, otherwise, determining that the future indoor temperature value will not exceed the corresponding comfort temperature range of the room within the preset time.

3. The control method of the air conditioning system according to claim 2, wherein if the current indoor temperature value of the room is greater than the corresponding design temperature and is less than or equal to the maximum value of the corresponding comfort temperature range, and if it is determined that the future indoor temperature value will not exceed the corresponding comfort temperature range of the room within the preset time, determining whether the absolute value of the change rate of the indoor temperature value is greater than the absolute value of a preset rate, if yes, controlling the corresponding valve to be closed or closed smaller, otherwise, continuing to monitor the current indoor temperature value, if the current indoor temperature value is greater than the maximum value of the adjustment temperature range of the room, controlling the corresponding valve to be opened or opened larger, otherwise, controlling the corresponding valve to be closed or closed smaller.

4. The control method of the air conditioning system according to claim 2, wherein if the current indoor temperature value of the room is greater than the corresponding design temperature and is less than or equal to the maximum value of the corresponding comfort temperature range, and if it is determined that the future indoor temperature value will not exceed the corresponding comfort temperature range of the room within the preset time, determining whether the absolute value of the change rate of the indoor temperature value is greater than the absolute value of a preset rate, if yes, controlling the corresponding valve to be opened or opened larger, otherwise, continuing to monitor the current indoor temperature value, if the current indoor temperature value is greater than the maximum value of the adjustment temperature range of the room, controlling the corresponding valve to be closed or closed smaller, otherwise, controlling the corresponding valve to be opened or opened larger.

5. The control method of the air conditioning system according to claim 1, wherein if the current indoor temperature value of the room is less than the corresponding design temperature and is greater than or equal to a minimum value of the corresponding comfort temperature range, determining the change rate of the indoor temperature value, and if the change rate of the indoor temperature value is less than 0, determining that the future indoor temperature value will be less than the minimum value of the corresponding comfort temperature range of the room within a preset time, otherwise, determining that the future indoor temperature value will not exceed the corresponding comfort temperature range of the room within the preset time.

6. The control method of the air conditioning system according to claim 5, wherein When the air conditioner is in cooling mode, if the current indoor temperature value of a room is less than the corresponding design temperature and greater than or equal to the minimum value of the corresponding comfort temperature range, if it is determined that the future indoor temperature value will not exceed the corresponding comfort range of the room within a preset time, it is determined whether the absolute value of the change rate of the indoor temperature value is greater than the absolute value of the preset rate, if yes, the corresponding valve is controlled to open or open wide, otherwise, the current indoor temperature value is continuously monitored, if the current indoor temperature value is less than the minimum value of the adjustment temperature range of the room, the corresponding valve is controlled to close or close small, otherwise the corresponding valve is controlled to open or open wide.

7. The control method of the air conditioning system according to claim 5, wherein When the air conditioner is in cooling mode, if the current indoor temperature value of a room is less than the corresponding design temperature and greater than or equal to the minimum value of the corresponding comfort temperature range, if it is determined that the future indoor temperature value will not exceed the corresponding comfort range of the room within a preset time, it is determined whether the absolute value of the change rate of the indoor temperature value is greater than the absolute value of the preset rate, if yes, the corresponding valve is controlled to open or open wide, otherwise, the current indoor temperature value is continuously monitored, if the current indoor temperature value is less than the minimum value of the adjustment temperature range of the room, the corresponding valve is controlled to close or close small, otherwise the corresponding valve is controlled to open or open wide.

8. The control method of the air conditioning system according to any one of claims 1 to 7, characterized by, If the air conditioner is in cooling mode, and it is determined that the future indoor temperature value will be greater than the maximum value of the comfort temperature range of the room within a preset time; The earliest temperature node in which the influence of the superimposed response temperature difference value of the future indoor temperature value is greater than the maximum value of the comfort temperature range of the room is found according to the inequality Tc-tk*tx>T0+Δt1, when the indoor temperature value reaches the temperature node, the corresponding valve is controlled to open or open wide; The Tc is the future indoor temperature value, the tk is the change rate of the indoor temperature value of the corresponding room, the tx is the thermal inertia response time corresponding to the future indoor temperature value, the T0 is the design temperature of the corresponding room, and the Δt1 is the absolute value of the difference between the maximum value of the comfort temperature range of the corresponding room temperature and the design temperature of the room.

9. The control method of the air conditioning system according to any one of claims 1 to 7, characterized by, If the air conditioner is in cooling mode, and it is determined that the future indoor temperature value will be less than the minimum value of the comfort temperature range of the room within a preset time; The earliest temperature node in which the influence of the superimposed response temperature difference value of the future indoor temperature value is less than the minimum value of the comfort temperature range of the room is found according to the inequality Tc-tk*tx>T0+Δt1, when the indoor temperature value reaches the temperature node, the corresponding valve is controlled to open or open wide; The Tc is the future indoor temperature value, the tk is the change rate of the indoor temperature value of the corresponding room, the tx is the thermal inertia response time corresponding to the future indoor temperature value, the T0 is the design temperature of the corresponding room, and the Δt1 is the absolute value of the difference between the maximum value of the comfort temperature range of the corresponding room temperature and the design temperature of the room.

10. The control method of the air conditioning system according to any one of claims 1 to 7, characterized by, If the air conditioner is in heating mode, and it is determined that the future indoor temperature value will be greater than the maximum value of the comfort temperature range of the corresponding room within a preset time, the earliest temperature node in the future indoor temperature value in which the influence of the superimposed response temperature difference is greater than the maximum value of the comfort temperature range of the room is found according to the inequality Tc-tk*tx>T0+Δt1, and when the indoor temperature value reaches the temperature node, the corresponding valve is controlled to be closed or smaller; the Tc is the future indoor temperature value, the tk is the change rate of the indoor temperature value of the corresponding room, the tx is the thermal inertia response time corresponding to the future indoor temperature value, the T0 is the design temperature of the corresponding room, and the Δt1 is the absolute value of the difference between the minimum value of the comfort temperature range of the corresponding room temperature and the design temperature of the room.

11. The control method of the air conditioning system according to any one of claims 1 to 7, characterized by, If the air conditioner is in heating mode, and it is determined that the future indoor temperature value will be less than the minimum value of the comfort temperature range of the corresponding room within a preset time, the earliest temperature node in the future indoor temperature value in which the influence of the superimposed response temperature difference is less than the minimum value of the comfort temperature range of the room is found according to the inequality Tc-tk*tx the Tc is the future indoor temperature value, the tk is the change rate of the indoor temperature value of the corresponding room, the tx is the thermal inertia response time corresponding to the future indoor temperature value, the T0 is the design temperature of the corresponding room, and the Δt1 is the absolute value of the difference between the minimum value of the comfort temperature range of the corresponding room temperature and the design temperature of the room.

12. The control method of the air conditioning system according to claim 1, wherein Before determining whether the current indoor temperature value of the room meets the design temperature of the corresponding room, it is determined whether the current indoor temperature value exceeds the corresponding comfort temperature range, and if so, the corresponding valve of the air conditioner is directly controlled accordingly, otherwise, it is determined whether the current indoor temperature value of the room meets the design temperature of the corresponding room.

13. The control method of the air conditioning system according to claim 12, wherein When the air conditioner is in cooling mode, before determining whether the current indoor temperature value of the room meets the design temperature of the corresponding room, if the current indoor temperature value is greater than the maximum value of the corresponding comfort temperature range, the corresponding valve of the air conditioner is controlled to be opened or larger; if the current indoor temperature value is less than the minimum value of the corresponding comfort temperature range, the corresponding valve of the air conditioner is controlled to be closed or smaller.

14. The control method of the air conditioning system according to claim 12, wherein When the air conditioner is in heating mode, before determining whether the current indoor temperature value of the room meets the design temperature of the corresponding room, if the current indoor temperature value is greater than the maximum value of the corresponding comfort temperature range, the corresponding valve of the air conditioner is controlled to be closed or smaller; If the current indoor temperature value is less than the minimum value of the corresponding comfort temperature range, the corresponding valve of the air conditioner is controlled to be opened or larger.

15. The control method of the air conditioning system according to claim 1, wherein The thermal inertia response time is calculated by the formula t x = At g + BT c + C; t x is the thermal inertia response time, t g is the chilled water supply temperature of the air conditioner, T c is the future indoor temperature value, and A, B, and C are coefficients.

16. The control method of an air conditioning system according to claim 1, wherein The corresponding comfort temperature range of the room is calculated by the formula PMV is a comfort index, M is the metabolic rate of the human body; t r is the average skin temperature of the human body in a comfortable state; Ta is the current indoor temperature value of the room in which the human body is located, t cl Th is the thermal resistance of the clothing worn by the human body.

17. The control method of the air conditioning system according to claim 1, wherein The load prediction model corresponding to the room includes an external wall heat transfer model, a roof radiation heat transfer model, an indoor air heat exchange model, an internal wall heat transfer model, and a floor heat exchange model.

18. An air conditioning system comprising a controller, characterised in that, The controller controls the air conditioner by using the control method of the air conditioning system according to any one of claims 1 to 17.

19. The air conditioning system of claim 18, wherein, The air conditioning system is a radiant air conditioning system.

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