Method and system for controlling air conditioning refrigeration outlet water temperature

Abstract

The present application discloses a method and system for controlling the outlet temperature of air conditioner refrigeration water, comprising: obtaining calculation data of all air-conditioned rooms corresponding to each room type for each room type; calculating the PMV value of each air-conditioned room based on the calculation data for each air-conditioned room for each room type; calculating the overall PMV value based on the preset weight corresponding to each room type and the PMV values ​​of all air-conditioned rooms; calculating the outlet temperature of air conditioner chilled water based on the overall PMV value, and sending the outlet temperature of air conditioner chilled water to a control device, so that the control device controls the outlet temperature of air conditioner refrigeration water in each air-conditioned room based on the outlet temperature of air conditioner chilled water and constraint conditions, wherein the constraint conditions are pre-constructed according to a functional relationship. Thus, the control strategy based on PMV value and weight calculation can provide high-precision and high-efficiency regulation for the air conditioner, and has strong adaptability and energy-saving effects.

Description

Technical Field

[0001] The present application relates to the field of air-conditioning energy-saving technology, and in particular to a method and system for controlling the outlet temperature of air-conditioning refrigeration water. Background Art

[0002] Water-cooled air conditioning systems, due to their low price, low noise, and high comfort, have captured a significant share of the air conditioning market. These systems use water as the heat exchange medium, transferring heat between end users and the air conditioner. However, as the chilled water outlet temperature increases, the efficiency of the refrigeration unit improves, while the cooling performance of the fan coil units decreases, resulting in a poor cooling effect and impacting user comfort. Therefore, controlling the chilled water outlet temperature while meeting user comfort requirements is a pressing issue.

[0003] In existing technologies, the control of air conditioning chilled water outlet temperature is generally for the purpose of energy saving. Generally, the air conditioning chilled water outlet temperature is controlled according to the indoor and outdoor temperature, heat (enthalpy value) or the load rate of the chiller. However, there are many shortcomings when dealing with complex environments and system status changes, resulting in the inability to provide high-precision and high-efficiency air conditioning chilled water outlet temperature control. Summary of the Invention

[0004] Based on the above-mentioned deficiencies of the prior art, the present application provides a method and system for controlling the outlet water temperature of an air conditioner refrigeration system to solve the problem of being unable to provide high-precision and high-efficiency regulation.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A first aspect of the present application provides a method for controlling the outlet temperature of refrigeration water in an air conditioner, comprising:

[0007] For each of the multiple room types, obtain calculation data for all air-conditioned rooms corresponding to the room type;

[0008] Calculating the PMV values ​​of the air-conditioned rooms according to the calculation data of the air-conditioned rooms respectively;

[0009] Calculate the overall PMV value based on the preset weight corresponding to each of the room types and the PMV values ​​of all air-conditioned rooms;

[0010] Based on the overall PMV value, the air-conditioning chilled water outlet temperature is calculated, and the air-conditioning chilled water outlet temperature is sent to the control device, so that the control device controls the air-conditioning refrigeration outlet temperature of each air-conditioned room according to the air-conditioning chilled water outlet temperature and the constraint conditions; wherein the constraint conditions are obtained by constructing according to a pre-constructed functional relationship.

[0011] Optionally, in the above-mentioned air-conditioning cooling water outlet temperature control method, calculating the PMV value of each of the plurality of air-conditioned rooms according to the calculated data of the air-conditioned rooms includes:

[0012] determining, for each of the plurality of air-conditioned rooms, clothing surface area coefficients according to clothing thermal resistance in the calculated data of the air-conditioned rooms;

[0013] Calculating the clothing surface temperature according to the clothing surface area coefficient and the human metabolic rate, effective mechanical power, clothing thermal resistance, average radiation temperature, convection heat transfer coefficient, and air temperature in the calculation data;

[0014] determining a convection heat transfer coefficient according to the clothing surface temperature and the air temperature;

[0015] Based on the wind speed, relative humidity and the human metabolic rate, the air temperature, the average radiation temperature, the clothing thermal resistance, the clothing surface area coefficient, and the clothing surface temperature in the calculation data, the PMV value of the air-conditioned room is calculated using a PMV calculation function.

[0016] Optionally, in the above-mentioned air-conditioning cooling water outlet temperature control method, calculating the overall PMV value according to the preset weight corresponding to each of the room types and the PMV values ​​of all air-conditioned rooms includes:

[0017] Obtain the number of rooms corresponding to each room type and the weight corresponding to each air-conditioned room;

[0018] Calculating an overall weight based on the weight corresponding to each of the air-conditioned rooms, the number of rooms, and the preset weight corresponding to each of the room types;

[0019] The overall PMV value is calculated based on the overall weight and the PMV values ​​of all air-conditioned rooms.

[0020] Optionally, in the above-mentioned air-conditioning refrigeration outlet water temperature control method, the air-conditioning chilled water outlet temperature is calculated based on the overall PMV value, including:

[0021] Obtain the inverse relationship between the PMV value and the target air conditioning chilled water outlet temperature;

[0022] According to the inverse relationship, a functional relationship between the PMV value and the target air-conditioning chilled water outlet temperature is constructed;

[0023] The air-conditioning chilled water outlet temperature is calculated based on the overall PMV value using the functional relationship.

[0024] Optionally, in the above-mentioned method for controlling the outlet temperature of air-conditioning refrigeration water, after sending the outlet temperature of the air-conditioning chilled water to the control device, the method further includes:

[0025] Get the customized delay time;

[0026] Determine whether the delay time is greater than a preset threshold;

[0027] If the delay time is greater than the preset threshold, returning to execute the calculation data of all air-conditioned rooms corresponding to each room type respectively;

[0028] If the delay time is not greater than the preset threshold, the process periodically returns to execute the process of obtaining the calculation data of all air-conditioned rooms corresponding to each room type.

[0029] A second aspect of the present application provides a control system for air conditioning refrigeration water outlet temperature, comprising:

[0030] A data acquisition unit, configured to acquire, for each of a plurality of room types, calculation data of all air-conditioned rooms corresponding to the room type;

[0031] a first calculating unit, configured to calculate the PMV value of each of the plurality of air-conditioned rooms according to the calculation data of the air-conditioned rooms;

[0032] A second calculation unit is used to calculate the overall PMV value according to the preset weight corresponding to each of the room types and the PMV values ​​of all air-conditioned rooms;

[0033] The third calculation unit is used to calculate the air-conditioning chilled water outlet temperature based on the overall PMV value, and send the air-conditioning chilled water outlet temperature to the control device, so that the control device controls the air-conditioning refrigeration outlet temperature of each air-conditioned room according to the air-conditioning chilled water outlet temperature and the constraint conditions; wherein the constraint conditions are obtained by constructing according to a pre-constructed functional relationship.

[0034] Optionally, in the above-mentioned air-conditioning cooling water outlet temperature control system, the first calculation unit includes:

[0035] a first determining unit, configured to determine, for each of the plurality of air-conditioned rooms, a clothing surface area coefficient according to clothing thermal resistance in the calculated data of the air-conditioned rooms;

[0036] a fourth calculation unit, configured to calculate the surface temperature of the clothing according to the clothing surface area coefficient and the human metabolic rate, effective mechanical power, clothing thermal resistance, mean radiation temperature, convection heat transfer coefficient, and air temperature in the calculation data;

[0037] a second determining unit, configured to determine a convection heat transfer coefficient according to the clothing surface temperature and the air temperature;

[0038] The fifth calculation unit is used to calculate the PMV value of the air-conditioned room using a PMV calculation function based on the wind speed, relative humidity and the human metabolic rate, the air temperature, the average radiation temperature, the clothing thermal resistance, the clothing surface area coefficient, and the clothing surface temperature in the calculation data.

[0039] Optionally, in the above-mentioned air-conditioning cooling water outlet temperature control system, the second calculation unit includes:

[0040] an acquiring unit, configured to acquire the number of rooms corresponding to each of the room types and the weight corresponding to each of the air-conditioned rooms;

[0041] a sixth calculation unit, configured to calculate an overall weight based on the weight corresponding to each of the air-conditioned rooms, the number of rooms, and the preset weight corresponding to each of the room types;

[0042] The seventh calculation unit is used to calculate the overall PMV value according to the overall weight and the PMV values ​​of all air-conditioned rooms.

[0043] Optionally, in the above-mentioned air-conditioning cooling water outlet temperature control system, the third calculation unit includes:

[0044] A relationship acquisition unit, used to acquire an inverse relationship between the PMV value and the target air-conditioning chilled water outlet temperature;

[0045] A construction unit, configured to construct a functional relationship between the PMV value and the target air-conditioning chilled water outlet temperature according to the inverse relationship;

[0046] An eighth calculation unit is configured to calculate the air-conditioning chilled water outlet temperature using the functional relationship according to the overall PMV value.

[0047] Optionally, the above-mentioned air-conditioning cooling water outlet temperature control system further includes:

[0048] Time acquisition unit, used to obtain customized delay time;

[0049] A judging unit, configured to judge whether the delay time is greater than a preset threshold;

[0050] A first execution unit is configured to return to executing the step of obtaining calculation data of all air-conditioned rooms corresponding to each room type if the delay time is greater than a preset threshold;

[0051] The second execution unit is configured to periodically return to execute the step of obtaining the calculation data of all air-conditioned rooms corresponding to each room type if the delay time is not greater than a preset threshold.

[0052] The present application provides a method for controlling the outlet temperature of air-conditioning refrigeration water. First, for each of multiple room types, calculation data for all air-conditioned rooms corresponding to the room type is obtained. Second, for each of the multiple air-conditioned rooms, the PMV value of the air-conditioned room is calculated based on the calculation data of the air-conditioned room. Then, based on the preset weight corresponding to each room type and the PMV values ​​of all air-conditioned rooms, an overall PMV value is calculated. Finally, based on the overall PMV value, the outlet temperature of the air-conditioning chilled water is calculated, and the outlet temperature of the air-conditioning chilled water is sent to a control device, so that the control device controls the outlet temperature of the air-conditioning refrigeration water in each air-conditioned room based on the outlet temperature of the air-conditioning chilled water and a constraint condition, wherein the constraint condition is pre-constructed based on a functional relationship. Thus, the control strategy based on the calculation of the PMV value and weight can provide high-precision and high-efficiency regulation for the air-conditioning, and can make the air-conditioning system more efficient and comfortable, while having strong adaptability and energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0054] Figure 1 A flow chart of a method for controlling the outlet water temperature of an air conditioner provided in an embodiment of the present application;

[0055] Figure 2 A flowchart of a method for calculating PMV provided in another embodiment of the present application;

[0056] Figure 3 A flowchart of a method for calculating an overall PMV is provided for another embodiment of the present application;

[0057] Figure 4 A flow chart of a method for calculating the outlet temperature of chilled water in an air conditioner according to another embodiment of the present application;

[0058] Figure 5 A schematic diagram of the structure of a linear function provided in an embodiment of the present application;

[0059] Figure 6 A schematic structural diagram of a control system for air-conditioning refrigeration outlet water temperature provided in another embodiment of the present application. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0061] In this application, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0062] The present application provides a method for controlling the outlet water temperature of an air conditioner. Figure 1 As shown, the specific steps include:

[0063] S101. For each of multiple room types, obtain calculation data of all air-conditioned rooms corresponding to the room type.

[0064] It is understandable that in order to meet the requirements of air-conditioning control for different room types, it is necessary to obtain the calculation data of all air-conditioned rooms corresponding to multiple room types, so that the PMV value can be calculated based on the calculation data. Then, as the PMV value changes, the air-conditioning chilled water outlet temperature value can be dynamically set to achieve the purpose of energy saving while ensuring user comfort.

[0065] For example, room types can include merchandise store type, discussion room type, etc. All air-conditioned rooms corresponding to a room type refer to all air-conditioned rooms in a room. Calculation data refers to data that can be used to calculate PMV values.

[0066] S102 : Calculate the PMV values ​​of the air-conditioned rooms according to the calculation data of the air-conditioned rooms, respectively.

[0067] Specifically, PMV (Predicted Mean Vote) is an index used to measure the thermal comfort of people in an air-conditioned room under a specific environment. Therefore, the PMV value of the air-conditioned room is calculated based on the obtained calculation data of the air-conditioned room. The calculation data may include air temperature, humidity, etc. required to calculate the PMV value.

[0068] Optionally, in another embodiment of the present application, a specific implementation of step S102 is as follows: Figure 2 As shown, the following steps are included:

[0069] S201 : Determine, for each of a plurality of air-conditioned rooms, a clothing surface area coefficient based on clothing thermal resistance in calculation data of the air-conditioned rooms.

[0070] Specifically, the clothing surface coefficient f cl The formula for determining is:

[0071]

[0072] Among them, I cl is the thermal resistance of clothing, in units of square meters Kelvin per watt (m2·K / W), obtained through calculation and conversion using a calculation program. cl The surface area coefficient of clothing is I cl Function of the thermal resistance of the garment.

[0073] S202. Calculate the clothing surface temperature based on the clothing surface area coefficient and the human metabolic rate, effective mechanical power, clothing thermal resistance, average radiation temperature, convection heat transfer coefficient, and air temperature in the calculation data.

[0074] Specifically, the clothing surface temperature t cl The calculation formula is:

[0075]

[0076] Where M is the metabolic rate of the human body, W is the effective mechanical power (usually zero), I cl is the thermal resistance of clothing, is the mean radiation temperature, h c is the convective heat transfer coefficient, t a is the air temperature. It should be noted that the clothing surface temperature t is calculated using the calculation data through the calculation program. cl . t cl The surface temperature of the clothing is I cl Function of the thermal resistance of the garment.

[0077] S203. Determine the convection heat transfer coefficient according to the clothing surface temperature and the air temperature.

[0078] Specifically, the convective heat transfer coefficient h c The formula for determining is:

[0079]

[0080] Among them, t cl is the surface temperature of clothing, t a is the air temperature, v ar is the relative wind speed. h c is the convective heat transfer coefficient, is the wind speed v a function.

[0081] S204. Calculate the PMV value of the air-conditioned room using a PMV calculation function based on the calculated data of wind speed, relative humidity, human metabolic rate, air temperature, average radiation temperature, clothing thermal resistance, clothing surface area coefficient, and clothing surface temperature.

[0082] Specifically, the calculation formula of the PMV value is:

[0083]

[0084] Among them, P a is the water vapor partial pressure, which can be calculated from the air temperature and relative humidity, M is the human metabolic rate, W is the effective mechanical power (usually zero), I cl is the thermal resistance of clothing, is the mean radiation temperature, h c is the convective heat transfer coefficient, t a is the air temperature. The above parameters are all indoor parameters.

[0085] S103: Calculate the overall PMV value based on the preset weight corresponding to each room type and the PMV values ​​of all air-conditioned rooms.

[0086] It's important to note that each room type has a different weight, and therefore has a different impact on the overall PMV. For example, the comfort level of larger or frequently used rooms has a greater impact on the overall PMV. Therefore, it's necessary to first determine the preset weights for each room type. These weights can be set based on the room's area, frequency of use, number of people, or other relevant factors. The overall PMV value is then calculated using a weighted average method, combining the preset weights for each room type and the PMV values ​​of all air-conditioned rooms.

[0087] Optionally, in another embodiment of the present application, a specific implementation of step S103 is as follows: Figure 3 As shown, the following steps are included:

[0088] S301: Obtain the number of rooms corresponding to each room type and the weight corresponding to each air-conditioned room.

[0089] Specifically, in order to reasonably evaluate and optimize the energy efficiency and comfort of the air-conditioning system in a building or facility and formulate a more accurate air-conditioning control strategy, it is necessary to obtain in advance the number of rooms corresponding to each room type and the weight corresponding to each air-conditioned room.

[0090] S302: Calculate the overall weight based on the weight corresponding to each air-conditioned room, the number of rooms, and the preset weight corresponding to each room type.

[0091] Specifically, the calculation formula for the overall weight is:

[0092]

[0093] Where n is the number of rooms, α i is the thermal comfort weight of the i-th room.

[0094] S303: Calculate the overall PMV value based on the overall weight and the PMV values ​​of all air-conditioned rooms.

[0095] Specifically, the calculation formula for the overall PMV value is:

[0096]

[0097] in, is the overall weight, n is the number of rooms, α i is the thermal comfort weight of the i-th room, PMV i is the PMV value of the i-th room.

[0098] S104. Calculate the air conditioning chilled water outlet temperature based on the overall PMV value, and send the air conditioning chilled water outlet temperature to the control device, so that the control device controls the air conditioning refrigeration outlet temperature of each air-conditioned room according to the air conditioning chilled water outlet temperature and the constraint condition.

[0099] It should be noted that in this embodiment of the application, the air conditioner chilled water outlet temperature is calculated based on the overall PMV value using the thermal comfort model PMV. Once the required chilled water outlet temperature for each air-conditioned room is calculated, the control system will receive this temperature value. Based on this, the control device will initiate the following control strategy:

[0100] Monitor the actual PMV value in the room: Use the temperature and humidity sensors in the room to monitor the changes in the PMV value in real time.

[0101] Adjust the chilled water temperature: Based on real-time monitoring data, the control device automatically adjusts the chilled water outlet temperature to keep the PMV value in the room as close to the target value as possible.

[0102] Consider constraints: such as the maximum chilled water temperature of the air-conditioning system, energy efficiency requirements, air-conditioning load, and other constraints to ensure that the control process is carried out under the constraints.

[0103] The control device will control the chilled water temperature in each air-conditioned room based on the above calculation results. The control strategy may include:

[0104] PID control (Proportional-Integral-Derivative control): Real-time adjustment of chilled water temperature to reduce PMV error.

[0105] Fuzzy control: When the system complexity is high or the environment changes greatly, fuzzy control can provide more flexible adjustment.

[0106] Multi-loop control: If there are multiple air-conditioned rooms, each room may have different chilled water temperature requirements. The control system can adopt a distributed control strategy to adjust it room by room.

[0107] The constraints are constructed based on pre-constructed functional relationships.

[0108] Specifically, the purpose of setting upper and lower temperature limits is: the chilled water outlet temperature usually ranges from 7 to 12°C. Below 7°C, the chiller may malfunction, mainly to protect the chiller equipment. Above 12°C, the cooling effect becomes very poor, defeating the purpose of starting the chiller. Therefore, the purpose of setting upper and lower limits is to ensure that the chiller operates under safe and stable conditions. The purpose of setting PMV upper and lower limits is: the PMV calculation results represent +3 hot, +2 warm, +1 slightly warm, 0 moderate, -1 slightly cool, -2 cool, and -3 cold. The purpose of setting upper and lower limits is to select appropriate upper and lower limits to avoid the problem of people feeling hot and cold and to ensure a certain level of comfort, which is the purpose of the constraints.

[0109] Specifically, the constraints are: 下限 ≤T≤t 上限 , PMV 舒适度下限 ≤PMV 整体 ≤PMV 舒适度上限 .

[0110] in:

[0111] t 下限 The lower limit of the outlet temperature of the chilled water of the air conditioner is in degrees Celsius (℃). 上限 The upper limit of the outlet temperature of the air-conditioning chilled water is in degrees Celsius (℃). 舒适度下限 The lower limit of the thermal comfort level of the human body. Below this lower limit, the body feels cold. 舒适度上限The upper limit of the human body's sense of thermal comfort. Above this limit, the body feels hotter. For rooms with high comfort requirements, the upper and lower limits are relatively small to maintain a certain level of comfort. For rooms with low comfort requirements, the upper and lower limits can be set larger.

[0112] The control device generally refers to a chiller. For example, if the actual outlet water temperature is 7°C and the setpoint is also 7°C, when the setpoint changes to 8°C, the controller adjusts the compressor load to change the outlet water temperature, raising the actual outlet water temperature by 8°C (this takes time, not instantaneously).

[0113] Optionally, in another embodiment of the present application, a specific implementation method of calculating the outlet temperature of the air-conditioning chilled water based on the overall PMV value in step S104 is as follows: Figure 4 As shown, the following steps are included:

[0114] S401: Obtain an inverse relationship between the PMV value and the target air-conditioning chilled water outlet temperature.

[0115] It is understandable that in air conditioning and refrigeration systems, when PMV 整体 In PMV 舒适度下限 When the corresponding air conditioning chilled water outlet temperature T value should be t 上限 , at this time if PMV 整体 Gradually increase, the T value can be appropriately reduced to ensure user comfort. Similarly, when PMV 整体 In PMV 舒适度上限 When the corresponding air conditioning chilled water outlet temperature T value should be t 下限 At this time, if the overall PMV value gradually decreases, the T value can be appropriately increased to save energy. Therefore, it can be obtained that the relationship between the PMV value and the target air conditioning chilled water outlet temperature is inversely proportional.

[0116] S402: Construct a functional relationship between the PMV value and the target air-conditioning chilled water outlet temperature based on an inverse proportional relationship.

[0117] Specifically, through the inverse relationship, the functional relationship between the PMV value and the target air conditioning chilled water outlet temperature is constructed as a monotonically decreasing function, that is, T=f(PMV 整体 ).

[0118] S403. Calculate the chilled water outlet temperature of the air conditioner using a functional relationship based on the overall PMV value.

[0119] Specifically, substitute the overall PMV value into the functional relationship T=f(PMV 整体 ) is solved to obtain the air conditioning chilled water outlet temperature.

[0120] Optionally, after the air conditioner chilled water outlet temperature is sent to the control device, that is, after executing step S104, the frequency of calculating the air conditioner chilled water outlet temperature may be controlled to reduce the computational burden, improve the operating efficiency of the system, avoid system overreaction or oscillation, maintain system stability, save energy and improve efficiency, and reduce unnecessary energy consumption. Therefore, another embodiment of the present application provides a method for calculating the frequency, comprising the following steps:

[0121] Get the custom delay time.

[0122] Optionally, the delay time ranges from 5 to 60 minutes, and of course it can also be other time thresholds, which can be specifically set according to needs.

[0123] Determine whether the delay time is greater than a preset threshold.

[0124] It should be noted that if the air conditioning is controlled too frequently, the temperature cannot remain stable, which is detrimental to the safe operation of the equipment and system. Therefore, a delay time can be set to control the temperature. In other words, it is determined whether the delay time is greater than a preset threshold. If the delay time is greater than the preset threshold, the chilled water outlet temperature set point T (°C) needs to be calculated in real time, and therefore it is necessary to immediately return to step S101. If the delay time is not greater than the preset threshold, the chilled water outlet temperature set point T (°C) can be calculated at corresponding intervals, that is, the execution of step S101 is periodically returned.

[0125] For ease of understanding, the control process of the air conditioning refrigeration outlet water temperature of this application can be described below using a specific application scenario. This application scenario takes a large project in Beijing as an example to illustrate the implementation method of this control method in an actual project.

[0126] The control method is built into the integrated energy management and control platform. Received telesignaling signals and telemetered values ​​are transmitted via wired communication from the field equipment control cabinet to the industrial gateway, which then transmits them to the integrated energy management and control platform via wired or wireless communication. The integrated energy management and control platform analyzes and calculates the data and issues control commands to the PLC or DCC control cabinet for control, or directly to the local equipment for control.

[0127] This application scenario uses the following formula to calculate the PMV value of each room in the commercial complex:

[0128]

[0129]

[0130]

[0131]

[0132] Methods for obtaining or setting parameters:

[0133] t a Air temperature: obtained through the room indoor temperature and humidity sensor, in degrees Celsius (℃).

[0134] RH air relative humidity: obtained through the room indoor temperature and humidity sensor, the unit is percentage (%).

[0135] Mean radiant temperature: equal to the air temperature, expressed in degrees Celsius (℃).

[0136] v a Wind speed: Considering the indoor scene of commercial complexes, combined with the provisions of the national standard "GB / T 28591-2012 Wind Force Level", set v a The wind speed is 0.1m / s.

[0137] M human metabolic rate: Considering the sales and shopping scenarios in commercial complexes, and in accordance with the provisions of the national standard "GB / T 18049-2017 Ergonomics of thermal environments - Analysis, measurement and interpretation of thermal comfort by calculating PMV and PPD indices and local thermal comfort criteria", the M human metabolic rate is set to 1.4met.

[0138] I cl Clothing thermal resistance: Considering the comprehensive clothing of people in the air-conditioning and cooling season, combined with the provisions of the national standard "GB / T 18049-2017 Ergonomics of thermal environment - Analysis, measurement and interpretation of thermal comfort by calculating PMV and PPD index and local thermal comfort criteria", set I cl The thermal resistance of the clothing is 0.76clo. For other parameters, please refer to the description of the above embodiment.

[0139] The PMV value of each room is calculated based on the above six data values ​​of each room.

[0140] The commercial complex has a total of 134 rooms in an independent cooling area, which are functional types of stores, restaurants and toilets. The PMV weights of each room are shown in Table 1 below:

[0141] Room Type Sales Store Restaurants bathroom total Number of rooms (n) 119 11 4 134 Room Type Weight a b c 1 Weight of each room (αi) a / 119 b / 11 c / 4 /

[0142] From the above table, the overall PMV value of the commercial complex is calculated as follows:

[0143]

[0144] In this embodiment, the basis for assigning weights to PMV values ​​is the room function type, which is only an example of the requirements of this patent. Other methods for assigning weights to PMV values ​​based on various room conditions are within the scope of protection of this patent.

[0145] The functional relationship between the air conditioning chilled water outlet temperature setting value T (℃) and the overall PMV value of the commercial complex is as follows: T=f(PMV 整体商业 ).

[0146] The constraints are as follows:

[0147] t 下限 ≤T≤t 上限

[0148] PMV 舒适度下限 ≤PMV 整体 ≤PMV 舒适度上限

[0149] Function T=f(PMV 整体商业 ) is a monotonically decreasing function.

[0150] The range of the set value T (°C) of the chilled water outlet temperature of the air conditioner in this embodiment is based on the national standard "GB / T 18430.1-2007 Vapor Compression Cycle Chillers (Heat Pumps) Part 1: Chillers (Heat Pumps) for Industrial, Commercial and Similar Purposes":

[0151] 5℃≤T≤15℃

[0152] The upper and lower limits of the PMV comfort level for the commercial complex in this embodiment are based on the national standard GB / T 50785-2012 Standard for the Evaluation of Indoor Thermal and Humid Environments of Civil Buildings.

[0153] -0.5≤PMV 整体商业 ≤+0.5

[0154] In this embodiment, the function T=f(PMV overall business) is selected as a linear function, from which the functional relationship can be obtained as follows (see Figure 5 ):

[0155] T=-10×PMV 整体商业 +10

[0156] In this embodiment, the method for selecting constraints and the type of function selection are merely examples of the requirements of this patent. Other methods for selecting constraints and types of function selection are within the scope of protection of this patent.

[0157] According to PMV 整体商业 And the functional relationship: T=-10×PMV 整体商业+10, calculate the air conditioning chilled water outlet temperature set value T (℃) and output it to the corresponding control device.

[0158] The control method calculates the frequency by setting the delay time:

[0159] In this embodiment, the delay time is selected as 5 minutes, that is, the air-conditioning chilled water outlet temperature setting value T (°C) is calculated every 5 minutes.

[0160] When the delay is completed, the control method returns to the first step and loops through the calculations.

[0161] In this embodiment, the selection result of the delay time is only an example of the requirements of this patent, and the selection results of other delay times are within the scope of protection of this patent.

[0162] The present application provides a method for controlling the outlet temperature of air-conditioning refrigeration water. First, for each of multiple room types, calculation data for all air-conditioned rooms corresponding to the room type is obtained. Second, for each of the multiple air-conditioned rooms, the PMV value of the air-conditioned room is calculated based on the calculation data of the air-conditioned room. Then, based on the preset weight corresponding to each room type and the PMV values ​​of all air-conditioned rooms, an overall PMV value is calculated. Finally, based on the overall PMV value, the outlet temperature of the air-conditioning chilled water is calculated, and the outlet temperature of the air-conditioning chilled water is sent to a control device, so that the control device controls the outlet temperature of the air-conditioning refrigeration water in each air-conditioned room based on the outlet temperature of the air-conditioning chilled water and a constraint condition, wherein the constraint condition is pre-constructed based on a functional relationship. Thus, the control strategy based on the calculation of the PMV value and weight can provide high-precision and high-efficiency regulation for the air-conditioning, and can make the air-conditioning system more efficient and comfortable, while having strong adaptability and energy-saving effects.

[0163] Another embodiment of the present application provides a control system for the outlet temperature of air-conditioning cooling water, such as Figure 6 As shown, it includes the following units:

[0164] The data acquisition unit 601 is configured to acquire, for each of the multiple room types, calculation data of all air-conditioned rooms corresponding to the room type.

[0165] The first calculation unit 602 is configured to calculate the PMV values ​​of the air-conditioned rooms according to the calculation data of the air-conditioned rooms, respectively.

[0166] The second calculation unit 603 is configured to calculate an overall PMV value according to a preset weight corresponding to each room type and the PMV values ​​of all air-conditioned rooms.

[0167] The third calculation unit 604 is configured to calculate the air conditioner chilled water outlet temperature based on the overall PMV value and transmit the air conditioner chilled water outlet temperature to the control device, so that the control device controls the air conditioner cooling water outlet temperature in each air-conditioned room based on the air conditioner chilled water outlet temperature and the constraint condition. The constraint condition is constructed based on a pre-established functional relationship.

[0168] It should be noted that the specific working process of the above modules in the embodiment of the present application can refer to steps S101 to S104 in the above method embodiment, and will not be repeated here.

[0169] Optionally, in another embodiment of the present application, in a control system for air conditioning cooling water outlet temperature, the first calculation unit 602 includes:

[0170] The first determining unit is configured to determine, for each of the plurality of air-conditioned rooms, clothing surface area coefficients according to clothing thermal resistance in the calculated data of the air-conditioned rooms.

[0171] The fourth calculation unit is used to calculate the surface temperature of the clothing according to the clothing surface area coefficient and the human metabolic rate, effective mechanical power, clothing thermal resistance, average radiation temperature, convection heat transfer coefficient and air temperature in the calculation data.

[0172] The second determining unit is used to determine the convection heat transfer coefficient according to the clothing surface temperature and the air temperature.

[0173] The fifth calculation unit is used to calculate the PMV value of the air-conditioned room using the PMV calculation function based on the wind speed, relative humidity and human metabolic rate, air temperature, average radiation temperature, clothing thermal resistance, clothing surface area coefficient, and clothing surface temperature in the calculated data.

[0174] Optionally, in another embodiment of the present application, in a control system for air conditioning cooling water outlet temperature, the second calculation unit 602 includes:

[0175] The acquisition unit is used to obtain the number of rooms corresponding to each room type and the weight corresponding to each air-conditioned room.

[0176] The sixth calculation unit is used to calculate the overall weight based on the weight corresponding to each air-conditioned room, the number of rooms and the preset weight corresponding to each room type.

[0177] The seventh calculation unit is used to calculate the overall PMV value according to the overall weight and the PMV values ​​of all air-conditioned rooms.

[0178] Optionally, in another embodiment of the present application, in a control system for air conditioning cooling water outlet temperature, the third calculation unit 603 includes:

[0179] The relationship acquisition unit is used to obtain the inverse relationship between the PMV value and the target air-conditioning chilled water outlet temperature.

[0180] The construction unit is used to construct a functional relationship between the PMV value and the target air-conditioning chilled water outlet temperature according to an inverse relationship.

[0181] The eighth calculation unit is used to calculate the air-conditioning chilled water outlet temperature using a functional relationship according to the overall PMV value.

[0182] Optionally, another embodiment of the present application provides an air conditioning cooling water outlet temperature control system, further comprising:

[0183] The time acquisition unit is used to obtain the customized delay time.

[0184] The judgment unit is used to judge whether the delay time is greater than a preset threshold.

[0185] The first execution unit is configured to return to execute calculation data of all air-conditioned rooms corresponding to each room type if the delay time is greater than a preset threshold.

[0186] The second execution unit is configured to periodically return to execute the operation for each room type if the delay time is not greater than a preset threshold value, and obtain calculation data of all air-conditioned rooms corresponding to the room type.

[0187] It should be noted that the specific working processes of the various modules provided in the above embodiments of the present application can refer to the corresponding steps in the above method embodiments, and will not be repeated here.

[0188] It should also be noted that the control system for air-conditioning refrigeration water outlet temperature provided in the embodiment of the present application has the technical effects of any of the above embodiments, and the embodiment of the present application will not be described in detail here.

[0189] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0190] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for controlling the outlet water temperature of an air conditioner, characterized in that: include: For each of the multiple room types, obtain calculation data for all air-conditioned rooms corresponding to the room type; Calculating the PMV values ​​of the air-conditioned rooms according to the calculation data of the air-conditioned rooms respectively; Calculate the overall PMV value based on the preset weight corresponding to each of the room types and the PMV values ​​of all air-conditioned rooms; Based on the overall PMV value, the air-conditioning chilled water outlet temperature is calculated, and the air-conditioning chilled water outlet temperature is sent to the control device, so that the control device controls the air-conditioning refrigeration outlet temperature of each air-conditioned room according to the air-conditioning chilled water outlet temperature and the constraint condition; wherein the constraint condition is constructed according to a pre-constructed functional relationship; the constraint condition is: t 下限 ≤T≤t 上限 , PMV 舒适度下限 ≤PMV 整体 ≤PMV 舒适度上限 ; Calculating the air-conditioning chilled water outlet temperature based on the overall PMV value includes: Obtain the inverse relationship between the PMV value and the target air conditioning chilled water outlet temperature; According to the inverse relationship, a functional relationship between the PMV value and the target air-conditioning chilled water outlet temperature is constructed; The air-conditioning chilled water outlet temperature is calculated based on the overall PMV value using the functional relationship.

2. The method according to claim 1, characterized in that Calculating the PMV values ​​of the air-conditioned rooms according to the calculation data of the air-conditioned rooms respectively includes: determining, for each of the plurality of air-conditioned rooms, clothing surface area coefficients according to clothing thermal resistance in the calculated data of the air-conditioned rooms; Calculating the clothing surface temperature according to the clothing surface area coefficient and the human metabolic rate, effective mechanical power, clothing thermal resistance, average radiation temperature, convection heat transfer coefficient, and air temperature in the calculation data; determining a convection heat transfer coefficient according to the clothing surface temperature and the air temperature; Based on the wind speed, relative humidity and the human metabolic rate, the air temperature, the average radiation temperature, the clothing thermal resistance, the clothing surface area coefficient, and the clothing surface temperature in the calculation data, the PMV value of the air-conditioned room is calculated using a PMV calculation function.

3. The method according to claim 1, characterized in that Calculating the overall PMV value based on the preset weight corresponding to each room type and the PMV values ​​of all air-conditioned rooms includes: Obtain the number of rooms corresponding to each room type and the weight corresponding to each air-conditioned room; Calculating an overall weight based on the weight corresponding to each of the air-conditioned rooms, the number of rooms, and the preset weight corresponding to each of the room types; The overall PMV value is calculated based on the overall weight and the PMV values ​​of all air-conditioned rooms.

4. The method according to claim 1, wherein After the air conditioner chilled water outlet temperature is sent to the control device, the method further includes: Get the customized delay time; Determine whether the delay time is greater than a preset threshold; If the delay time is greater than the preset threshold, returning to execute the calculation data of all air-conditioned rooms corresponding to each room type respectively; If the delay time is not greater than the preset threshold, the process periodically returns to execute the process of obtaining the calculation data of all air-conditioned rooms corresponding to each room type.

5. A control system for air conditioning refrigeration water outlet temperature, characterized in that: include: A data acquisition unit, configured to acquire, for each of a plurality of room types, calculation data of all air-conditioned rooms corresponding to the room type; a first calculating unit, configured to calculate the PMV value of each of the plurality of air-conditioned rooms according to the calculation data of the air-conditioned rooms; A second calculation unit is used to calculate the overall PMV value according to the preset weight corresponding to each of the room types and the PMV values ​​of all air-conditioned rooms; The third calculation unit is used to calculate the air-conditioning chilled water outlet temperature based on the overall PMV value, and send the air-conditioning chilled water outlet temperature to the control device, so that the control device controls the air-conditioning refrigeration outlet temperature of each air-conditioned room according to the air-conditioning chilled water outlet temperature and the constraint condition; wherein the constraint condition is constructed according to a pre-constructed functional relationship; the constraint condition is: t 下限 ≤T≤t 上限 , PMV 舒适度下限 ≤PMV 整体 ≤PMV 舒适度上限 ; Wherein, the third computing unit includes: A relationship acquisition unit, used to acquire an inverse relationship between the PMV value and the target air-conditioning chilled water outlet temperature; A construction unit, configured to construct a functional relationship between the PMV value and the target air-conditioning chilled water outlet temperature according to the inverse relationship; An eighth calculation unit is configured to calculate the air-conditioning chilled water outlet temperature using the functional relationship according to the overall PMV value.

6. The system according to claim 5, characterized in that The first computing unit includes: a first determining unit, configured to determine, for each of the plurality of air-conditioned rooms, a clothing surface area coefficient according to clothing thermal resistance in the calculated data of the air-conditioned rooms; a fourth calculation unit, configured to calculate the surface temperature of the clothing according to the clothing surface area coefficient and the human metabolic rate, effective mechanical power, clothing thermal resistance, mean radiation temperature, convection heat transfer coefficient, and air temperature in the calculation data; a second determining unit, configured to determine a convection heat transfer coefficient according to the clothing surface temperature and the air temperature; The fifth calculation unit is used to calculate the PMV value of the air-conditioned room using a PMV calculation function based on the wind speed, relative humidity and the human metabolic rate, the air temperature, the average radiation temperature, the clothing thermal resistance, the clothing surface area coefficient, and the clothing surface temperature in the calculation data.

7. The system according to claim 6, characterized in that The second computing unit includes: an acquiring unit, configured to acquire the number of rooms corresponding to each of the room types and the weight corresponding to each of the air-conditioned rooms; a sixth calculation unit, configured to calculate an overall weight based on the weight corresponding to each of the air-conditioned rooms, the number of rooms, and the preset weight corresponding to each of the room types; The seventh calculation unit is used to calculate the overall PMV value according to the overall weight and the PMV values ​​of all air-conditioned rooms.

8. The system according to claim 5, wherein: Also includes: Time acquisition unit, used to obtain customized delay time; A judging unit, configured to judge whether the delay time is greater than a preset threshold; A first execution unit is configured to return to executing the step of obtaining calculation data of all air-conditioned rooms corresponding to each room type if the delay time is greater than a preset threshold; The second execution unit is configured to periodically return to execute the step of obtaining the calculation data of all air-conditioned rooms corresponding to each room type if the delay time is not greater than a preset threshold.

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