Heat pump system, control method of heat pump system, and storage medium

Abstract

The invention relates to a heat pump system, a control method of the heat pump system and a storage medium. The heat pump system comprises a main control module, a heat pump air conditioning unit, N photovoltaic photo-thermal assemblies arranged in parallel, N sub-control modules arranged corresponding to the N photovoltaic photo-thermal assemblies, N detection modules and N switch modules. The heat pump air conditioning unit comprises an evaporator, a compressor, a condenser and an electronic expansion valve which are sequentially connected in series, and the refrigerant input end of each photovoltaic photo-thermal assembly communicates with a first refrigerant pipeline between the condenser and the electronic expansion valve. The refrigerant output end of each photovoltaic photo-thermal assembly communicates with the second refrigerant pipeline between the evaporator and the compressor. And each sub-control module, each detection module and each switch module are electrically connected with the main control module. In this way, the flow of the refrigerant flowing through all the photovoltaic photo-thermal assemblies can be accurately controlled through the main control module, and the overall heat exchange effect of the photovoltaic photo-thermal assemblies is improved.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a heat pump system, a control method for the heat pump system, and a storage medium. Background Technology

[0002] Photovoltaic-Thermal (PVT) modules are a type of module that integrates photovoltaic power generation and solar thermal energy. To improve the power generation efficiency and waste heat utilization rate of PVT modules, current technologies typically combine PVT modules with heat pump air conditioning units. This allows the refrigerant in the heat pump air conditioning unit to remove excess heat from the back of the PVT module.

[0003] However, when multiple PVT modules are used simultaneously, the overall heat exchange performance of these modules will be poor if the refrigerant flowing into each module cannot be precisely controlled due to the varying heat exchange capacities of each module. Therefore, improving the overall heat exchange performance of PVT modules has become an urgent technical problem to be solved. Summary of the Invention

[0004] This application provides a heat pump system, a control method for the heat pump system, and a storage medium to solve the problem of poor overall heat exchange performance when multiple PVT components are used simultaneously in the prior art.

[0005] In a first aspect, embodiments of this application provide a heat pump system, the heat pump system comprising: a main control module, a heat pump air conditioning unit, N photovoltaic thermal modules arranged in parallel, and N sub-control modules, N detection modules and N switch modules arranged corresponding to the N photovoltaic thermal modules, each photovoltaic thermal module being respectively arranged with one sub-control module, one detection module and one switch module, where N is any integer greater than 1; The heat pump air conditioning unit includes an evaporator, a compressor, a condenser, and an electronic expansion valve connected in series. The refrigerant input end of each photovoltaic thermal module is connected to a first refrigerant pipeline between the condenser and the electronic expansion valve, and the refrigerant output end of each photovoltaic thermal module is connected to a second refrigerant pipeline between the evaporator and the compressor. Each of the sub-control modules is electrically connected to its corresponding photovoltaic thermal module. Each of the sub-control modules, detection modules, and switch modules is electrically connected to the main control module. The main control module is used to acquire the power generation of each photovoltaic thermal module collected by each of the sub-control modules and the detection data of each photovoltaic thermal module collected by each of the detection modules. Based on the power generation of each photovoltaic thermal module and the detection data of each photovoltaic thermal module, the main control module controls the opening degree of the switch module corresponding to each photovoltaic thermal module.

[0006] Optionally, each of the detection modules includes a first temperature detection unit; Each of the first temperature detection units is respectively set at the refrigerant input terminal of the corresponding photovoltaic thermal module, and each of the first temperature detection units is used to collect the first temperature value of the refrigerant flowing into each of the photovoltaic thermal modules. Each of the first temperature detection units is electrically connected to the main control module. The main control module is used to control the opening degree of the switch module corresponding to each photovoltaic thermal module based on the power generation of each photovoltaic thermal module and the first temperature value of the refrigerant flowing into each photovoltaic thermal module.

[0007] Optionally, each of the detection modules further includes a second temperature detection unit; Each of the second temperature detection units is respectively set at the refrigerant output terminal of the corresponding photovoltaic thermal module, and each of the second temperature detection units is used to collect the second temperature value of the refrigerant flowing out of each photovoltaic thermal module. Each of the second temperature detection units is electrically connected to the main control module. The main control module is used to control the opening degree of the switch module corresponding to each photovoltaic thermal module based on the power generation of each photovoltaic thermal module and the second temperature value of the refrigerant flowing out of each photovoltaic thermal module.

[0008] Optionally, the heat pump system further includes a refrigerant pump, which is connected in series between the refrigerant input terminal of each photovoltaic thermal module and the first refrigerant pipeline, and each detection module further includes a pressure detection unit; Each of the pressure detection units is located at the refrigerant input end of its corresponding photovoltaic thermal module; Each of the pressure detection units is electrically connected to the main control module, which controls the operating frequency of the refrigerant pump based on the pressure values ​​collected by each pressure detection unit.

[0009] Secondly, embodiments of this application also provide a control method for a heat pump system, applied to the heat pump system described in the first aspect, the method comprising: The power generation of each photovoltaic and solar thermal module is collected by each sub-control module and the detection data of each photovoltaic and solar thermal module is collected by each detection module. Based on the power generation of each photovoltaic and solar thermal module and the detection data of each photovoltaic and solar thermal module, the opening degree of the switch module corresponding to each photovoltaic and solar thermal module is controlled.

[0010] Optionally, controlling the opening degree of the switching module corresponding to each photovoltaic thermal module based on the power generation of each photovoltaic thermal module and the detection data of each photovoltaic thermal module includes: When the power generation of each photovoltaic and solar thermal module is uniform, the first temperature value of the refrigerant flowing into each photovoltaic and solar thermal module is obtained, wherein the first temperature value is obtained based on the first temperature detection unit set at the refrigerant input end of each photovoltaic and solar thermal module. Based on the first temperature value, the opening degree of the switch module corresponding to each photovoltaic and solar thermal module is adjusted so that the temperature of the refrigerant flowing into each photovoltaic and solar thermal module tends to be consistent.

[0011] Optionally, controlling the opening degree of the switching module corresponding to each photovoltaic thermal module based on the power generation of each photovoltaic thermal module and the detection data of each photovoltaic thermal module further includes: When the power generation of each photovoltaic and solar thermal module is uneven, a second temperature value of the refrigerant flowing out of each photovoltaic and solar thermal module is obtained, wherein the second temperature value is obtained based on the second temperature detection unit set at the refrigerant output end of each photovoltaic and solar thermal module; Compare the second temperature value with a preset temperature threshold; The opening degree of the switch module corresponding to the photovoltaic thermal module whose second temperature value is less than the preset temperature threshold is reduced until the second temperature value is greater than or equal to the preset temperature threshold.

[0012] Optionally, controlling the opening degree of the switching module corresponding to each photovoltaic thermal module based on the power generation of each photovoltaic thermal module and the detection data of each photovoltaic thermal module further includes: The power generation of each photovoltaic and solar thermal module is compared with a preset power threshold. The switching module corresponding to the photovoltaic thermal module whose power generation is less than the preset power threshold is turned off.

[0013] Optionally, the heat pump system further includes a refrigerant pump, and each of the detection modules further includes a pressure detection unit; the method further includes: The pressure values ​​collected by each pressure detection unit are obtained, and a comprehensive pressure value is determined based on the pressure values ​​collected by each pressure detection unit. If the overall pressure value is less than a preset pressure threshold, increase the operating frequency of the refrigerant pump.

[0014] Thirdly, embodiments of this application also provide a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the control method of the heat pump system described in the second aspect.

[0015] Compared with the prior art, the technical solution provided in this application has the following advantages: The heat pump system provided in this application includes: a main control module, a heat pump air conditioning unit, N photovoltaic thermal modules connected in parallel, and N sub-control modules, N detection modules, and N switch modules corresponding to the N photovoltaic thermal modules. Each photovoltaic thermal module is respectively associated with one sub-control module, one detection module, and one switch module, where N is any integer greater than 1. The heat pump air conditioning unit includes an evaporator, a compressor, a condenser, and an electronic expansion valve connected in series. The refrigerant input terminal of each photovoltaic thermal module is connected to the condenser and the electronic expansion valve. The first refrigerant pipeline is connected, and the refrigerant output terminal of each photovoltaic thermal module is connected to the second refrigerant pipeline between the evaporator and the compressor. Each sub-control module is electrically connected to its corresponding photovoltaic thermal module. Each sub-control module, each detection module, and each switch module are electrically connected to the main control module. The main control module is used to acquire the power generation of each photovoltaic thermal module collected by each sub-control module and the detection data of each photovoltaic thermal module collected by each detection module, and to control the opening degree of the switch module corresponding to each photovoltaic thermal module based on the power generation of each photovoltaic thermal module and the detection data of each photovoltaic thermal module. In this way, when multiple photovoltaic (PV) thermal modules are used simultaneously, the heat exchange capacity and heat exchange status of each PV thermal module can be determined based on its power generation and detection data. This allows for control of the opening degree of the corresponding switch module for each PV thermal module, thereby enabling precise control of the flow rate of the refrigerant through each PV thermal module and improving the overall heat exchange effect of the PV thermal modules. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0019] Figure 1 A structural block diagram of a heat pump system provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a heat pump system provided in an embodiment of this application; Figure 3 A schematic flowchart illustrating a control method for a heat pump system provided in an embodiment of this application; Figure 4 This is a flowchart illustrating another control method for a heat pump system provided in an embodiment of this application.

[0020] Explanation of reference numerals in the attached figures: 100. Heat pump air conditioning unit; 200. Photovoltaic thermal module; 300. Sub-control module; 400. Detection module; 500. Switch module; 110. Evaporator; 120. Compressor; 130. Condenser; 140. Electronic expansion valve; 410. First temperature detection unit; 420. Second temperature detection unit; 600. Refrigerant pump; 430. Pressure detection unit. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0023] To address the problem of poor overall heat exchange performance when multiple PVT components are used simultaneously in the prior art, this application provides a heat pump system, a control method for the heat pump system, and a storage medium that can improve the overall heat exchange performance of PVT components.

[0024] See Figure 1 and Figure 2 , Figure 1 This is a structural block diagram of a heat pump system provided in an embodiment of this application. Figure 2 This is a schematic diagram of a heat pump system provided as an embodiment of this application. Figure 1 and Figure 2 As shown, the heat pump system includes: a main control module (not shown in the figure), a heat pump air conditioning unit 100, N photovoltaic thermal modules 200 arranged in parallel, and N sub-control modules 300, N detection modules 400 and N switch modules 500 arranged corresponding to the N photovoltaic thermal modules 200. Each photovoltaic thermal module 200 is respectively arranged with one sub-control module 300, one detection module 400 and one switch module 500, and N is any integer greater than 1. The heat pump air conditioning unit 100 includes an evaporator 110, a compressor 120, a condenser 130 and an electronic expansion valve 140 connected in series. The refrigerant input end of each photovoltaic thermal module 200 is connected to the first refrigerant pipeline between the condenser 130 and the electronic expansion valve 140, and the refrigerant output end of each photovoltaic thermal module 200 is connected to the second refrigerant pipeline between the evaporator 110 and the compressor 120. Each sub-control module 300 is electrically connected to its corresponding photovoltaic thermal module 200. Each sub-control module 300, each detection module 400, and each switch module 500 are electrically connected to the main control module. The main control module is used to acquire the power generation of each photovoltaic thermal module 200 collected by each sub-control module 300 and the detection data of each photovoltaic thermal module 200 collected by each detection module 400, and to control the opening degree of the switch module 500 corresponding to each photovoltaic thermal module 200 based on the power generation of each photovoltaic thermal module 200 and the detection data of each photovoltaic thermal module 200.

[0025] Specifically, the aforementioned main control module can be a control module integrated into the heat pump air conditioning unit 100, or it can be a control module independent of the heat pump air conditioning unit 100. This application embodiment does not impose specific limitations. The aforementioned photovoltaic-thermal module 200 (i.e., PVT module) can include a photovoltaic power generation unit and a solar thermal unit. The photovoltaic power generation unit is used to convert solar energy into electrical energy; the solar thermal unit is used to convert solar energy into heat energy for use by the heat pump air conditioning unit 100. The aforementioned sub-control module 300 can be used to consume the electrical energy generated by the corresponding photovoltaic-thermal module 200 and monitor the power generation parameters of the photovoltaic-thermal module 200 to obtain the power generation capacity of the photovoltaic-thermal module 200. Here, power generation capacity refers to the electrical energy generated per unit time, which indirectly reflects the heat exchange capacity of the photovoltaic-thermal module 200. The higher the power generation capacity, the stronger the heat exchange capacity of the photovoltaic-thermal module 200; the lower the power generation capacity, the weaker the heat exchange capacity of the photovoltaic-thermal module 200. Compared to monitoring irradiance and power generation, heat pump systems offer faster response times and lower engineering costs. The aforementioned detection module 400 may include components such as a temperature detection unit and a pressure detection unit 430, primarily used to detect parameters such as the temperature and pressure of the refrigerant flowing into or out of each photovoltaic thermal module 200. The aforementioned switching module 500 may include switching elements such as expansion valves and solenoid valves.

[0026] It should be noted that the photovoltaic thermal module 200, the sub-control module 300, the detection module 400, and the switch module 500 are configured in a one-to-one correspondence, meaning that each photovoltaic thermal module 200 is associated with one sub-control module 300, one detection module 400, and one switch module 500. In this way, the main control module can acquire the power generation data of each photovoltaic thermal module 200 collected by each sub-control module 300 and the detection data of each photovoltaic thermal module 200 collected by each detection module 400. Based on the power generation data and detection data of each photovoltaic thermal module 200, the main control module can control the opening degree of the switch module 500 corresponding to each photovoltaic thermal module 200, thereby achieving independent control of each photovoltaic thermal module 200.

[0027] In this way, when multiple photovoltaic thermal modules 200 are used simultaneously, the heat exchange capacity and heat exchange status of each photovoltaic thermal module 200 can be determined based on the power generation and detection data of each photovoltaic thermal module 200. This allows for the control of the opening degree of the corresponding switch module 500 for each photovoltaic thermal module 200, thereby enabling precise control of the flow rate of the refrigerant flowing through each photovoltaic thermal module 200 and improving the overall heat exchange effect of the photovoltaic thermal modules 200.

[0028] In an optional embodiment, each detection module 400 includes a first temperature detection unit 410; Each first temperature detection unit 410 is respectively set at the refrigerant input end of its corresponding photovoltaic thermal module 200, and each first temperature detection unit 410 is used to collect the first temperature value of the refrigerant flowing into each photovoltaic thermal module 200. Each first temperature detection unit 410 is electrically connected to the main control module. The main control module is used to control the opening degree of the switch module 500 corresponding to each photovoltaic thermal module 200 based on the power generation of each photovoltaic thermal module 200 and the first temperature value of the refrigerant flowing into each photovoltaic thermal module 200.

[0029] Specifically, each photovoltaic thermal module 200 is equipped with a first temperature detection unit 410 at the refrigerant input end. Each first temperature detection unit 410 is used to collect the first temperature value of the refrigerant flowing into each photovoltaic thermal module 200.

[0030] In this way, the main control module can control the opening degree of the switch module 500 corresponding to each photovoltaic (PV) thermal module 200 based on the power generation of each PV thermal module 200 and the corresponding first temperature value of each PV thermal module 200. Specifically, when the power generation of each PV thermal module 200 is uniform (i.e., the heat exchange capacity of each PV thermal module 200 is basically the same), the first temperature value of the refrigerant flowing into each PV thermal module 200 is obtained. Then, the first temperature values ​​of the refrigerant flowing into each PV thermal module 200 are compared. When the first temperature values ​​of the refrigerant flowing into each PV thermal module 200 are inconsistent, the opening degree of the switch module 500 corresponding to each PV thermal module 200 is dynamically adjusted according to the first temperature values ​​of the refrigerant flowing into each PV thermal module 200, so that the temperature of the refrigerant flowing into each PV thermal module 200 tends to be uniform. This effectively solves the problem of significant differences in the temperature of the refrigerant flowing into each photovoltaic thermal module 200 when the pipelines of each photovoltaic thermal module 200 are connected in parallel, due to pipeline length and other external factors. This ensures that the temperature of the refrigerant flowing into each photovoltaic thermal module 200 is basically consistent, effectively improving the uniformity of heat exchange of the refrigerant inside each photovoltaic thermal module.

[0031] In an optional embodiment, each detection module 400 further includes a second temperature detection unit 420; Each second temperature detection unit 420 is respectively set at the refrigerant output end of its corresponding photovoltaic thermal module 200, and each second temperature detection unit 420 is used to collect the second temperature value of the refrigerant flowing out of each photovoltaic thermal module 200. Each second temperature detection unit 420 is electrically connected to the main control module. The main control module is used to control the opening degree of the switch module 500 corresponding to each photovoltaic thermal module 200 based on the power generation of each photovoltaic thermal module 200 and the second temperature value of the refrigerant flowing out of each photovoltaic thermal module 200.

[0032] Specifically, each photovoltaic thermal module 200 is equipped with a second temperature detection unit 420 at the refrigerant output end. Each second temperature detection unit 420 is used to collect the second temperature value of the refrigerant flowing out of each photovoltaic thermal module 200.

[0033] In this way, the main control module can also control the opening degree of the switch module 500 corresponding to each photovoltaic (PV) thermal module 200 based on the power generation of each PV thermal module 200 and the corresponding second temperature value of each PV thermal module 200. Specifically, when the power generation of each PV thermal module 200 is uneven (i.e., the heat exchange capacity of each PV thermal module 200 is inconsistent), the second temperature value of the refrigerant flowing out of each PV thermal module 200 is obtained, and then compared with a preset temperature threshold (i.e., the critical temperature at which the refrigerant changes from a liquid to a gaseous state). If there are PV thermal modules 200 whose second temperature value is lower than the preset temperature threshold, it indicates that the internal refrigerant of this part of the PV thermal module 200 has not reached the target vaporization state and needs further heat exchange. Therefore, the opening degree of the switch module 500 corresponding to this part of the PV thermal module 200 can be reduced until their second temperature value of the flowing out refrigerant is greater than or equal to the preset temperature threshold. The preset temperature threshold here can be determined by the type of refrigerant. In this way, the opening degree of the switch module 500 corresponding to the photovoltaic thermal module 200 whose internal refrigerant has not reached the target vaporization state can be reduced, thereby reducing the flow rate of the internal refrigerant in these photovoltaic thermal modules 200, so that the internal refrigerant reaches the target vaporization state as much as possible when flowing out of the photovoltaic thermal module 200.

[0034] In an optional embodiment, the heat pump system further includes a refrigerant pump 600, which is connected in series between the refrigerant input terminal of each photovoltaic thermal module 200 and the first refrigerant pipeline. Each detection module 400 also includes a pressure detection unit 430. Each pressure detection unit 430 is located at the refrigerant input end of its corresponding photovoltaic thermal module 200; Each pressure detection unit 430 is electrically connected to the main control module, which controls the operating frequency of the refrigerant pump 600 based on the pressure values ​​collected by each pressure detection unit 430.

[0035] Specifically, the aforementioned refrigerant pump 600 is connected in series between the refrigerant inlet of each photovoltaic thermal module 200 and the first refrigerant pipeline. The refrigerant pump 600 can provide the power required for the refrigerant to flow into each photovoltaic thermal module 200. Each photovoltaic thermal module 200 is equipped with a pressure detection unit 430 at its refrigerant inlet, and each pressure detection unit 430 is used to collect the pressure value at the refrigerant inlet of each photovoltaic thermal module 200.

[0036] In this way, the main control module can control the operating frequency of the refrigerant pump 600 based on the pressure values ​​collected by each pressure detection unit 430. Specifically, the main control module can acquire the pressure values ​​collected by each pressure detection unit 430 and calculate the average value of the pressure values ​​collected by each pressure detection unit 430 to determine the comprehensive pressure value in the parallel pipeline. Then, the comprehensive pressure value is compared with a preset pressure threshold. If the comprehensive pressure value is less than the preset pressure threshold, the operating frequency of the refrigerant pump 600 is increased to pressurize the parallel pipeline, thereby ensuring that the pressure value in the parallel pipeline reaches the preset pressure threshold, so that the refrigerant can flow smoothly in each photovoltaic thermal module 200.

[0037] See Figure 3 , Figure 3 This is a flowchart illustrating a control method for a heat pump system provided in an embodiment of this application. This control method can be applied to the heat pump system in any of the foregoing embodiments, and may include the following steps: Step S301: Obtain the power generation of each photovoltaic and solar thermal module collected by each sub-control module and the detection data of each photovoltaic and solar thermal module collected by each detection module.

[0038] Specifically, the aforementioned power generation can be calculated by the sub-control module based on the monitored voltage and current values ​​of each photovoltaic (PV) thermal module and then output to the main control module. When the heat pump system is running, the PV thermal modules simultaneously generate and heat. The power generation is primarily affected by changes in irradiance, which are further reflected in changes in the voltage and current values ​​of the PV modules. Changes in power generation are more sensitive than changes in heat generation; therefore, this application selects the power generation of the PV thermal modules as the monitoring value to control the operation of the heat pump system. In this way, changes in irradiance are converted into changes in power generation. By comparing the power generation, the heat exchange effect of each PV thermal module can be adjusted. Compared to monitoring irradiance, the heat pump system has a faster response speed and lower engineering costs.

[0039] The aforementioned detection data may include the temperature of the refrigerant flowing into the photovoltaic thermal module, the pressure of the refrigerant flowing into the module, and the temperature of the refrigerant flowing out of the module. This detection data can be collected by detection modules (such as various sensors) installed at the refrigerant input and output ends of the photovoltaic thermal module.

[0040] Step S302: Based on the power generation of each photovoltaic and solar thermal module and the detection data of each photovoltaic and solar thermal module, control the opening degree of the corresponding switch module of each photovoltaic and solar thermal module.

[0041] After acquiring the power generation data of each photovoltaic (PV) thermal module from the sub-control modules and the detection data from the detection modules, the main control module can determine the heat exchange capacity of each PV thermal module based on its power generation and its heat exchange status based on the detection data. This allows for precise control of the refrigerant flow through each PV thermal module, thus improving the overall heat exchange performance.

[0042] In an optional embodiment, step S302, controlling the opening degree of the switching module corresponding to each photovoltaic thermal module based on the power generation of each photovoltaic thermal module and the detection data of each photovoltaic thermal module, includes: Under the condition that the power generation of each photovoltaic and solar thermal module is uniform, the first temperature value of the refrigerant flowing into each photovoltaic and solar thermal module is obtained, wherein the first temperature value is obtained based on the first temperature detection unit set at the refrigerant input end of each photovoltaic and solar thermal module. Based on the first temperature value, the opening degree of the corresponding switch module of each photovoltaic and solar thermal module is adjusted so that the temperature of the refrigerant flowing into each photovoltaic and solar thermal module tends to be consistent.

[0043] Specifically, the main control module can obtain the first temperature value of the refrigerant flowing into each photovoltaic (PV) thermal module when the power generation of each PV thermal module is uniform (i.e., the heat exchange capacity of each PV thermal module is basically the same). Then, it compares these first temperatures. When the first temperatures are inconsistent, the module dynamically adjusts the opening of the corresponding switch module for each PV thermal module based on these temperatures to ensure the refrigerant temperature flowing into each PV thermal module is consistent. This effectively solves the problem of significant differences in refrigerant temperature when the pipelines of PV thermal modules are connected in parallel, due to pipeline length and other external factors. It ensures that the refrigerant temperature flowing into each PV thermal module is basically consistent, effectively improving the uniformity of heat exchange within each PV thermal module.

[0044] In an optional embodiment, step S302, controlling the opening degree of the switching module corresponding to each photovoltaic thermal module based on the power generation of each photovoltaic thermal module and the detection data of each photovoltaic thermal module, further includes: When the power generation of each photovoltaic and solar thermal module is uneven, the second temperature value of the refrigerant flowing out of each photovoltaic and solar thermal module is obtained. The second temperature value is obtained based on the second temperature detection unit set at the refrigerant output end of each photovoltaic and solar thermal module. Compare the second temperature value with a preset temperature threshold; The opening degree of the switch module corresponding to the photovoltaic thermal module whose second temperature value is less than the preset temperature threshold is reduced until the second temperature value is greater than or equal to the preset temperature threshold.

[0045] Specifically, when the power generation of each photovoltaic (PV) thermal module is uneven (i.e., the heat exchange capacity of each PV thermal module is inconsistent), the main control module can obtain the second temperature value of the refrigerant flowing out of each PV thermal module, and then compare the second temperature value of the refrigerant flowing out of each PV thermal module with a preset temperature threshold (i.e., the critical temperature at which the refrigerant changes from a liquid to a gaseous state). If there are PV thermal modules with a second temperature value lower than the preset temperature threshold, it indicates that the internal refrigerant of these PV thermal modules has not reached the target vaporization state and further heat exchange is required. Therefore, the opening degree of the switch module corresponding to these PV thermal modules can be reduced until their second temperature value of the flowing out refrigerant is greater than or equal to the preset temperature threshold. The preset temperature threshold can be determined by the type of refrigerant.

[0046] In this way, the opening degree of the switch module corresponding to the photovoltaic and solar thermal module whose internal refrigerant has not reached the target vaporization state can be reduced, thereby reducing the flow rate of the internal refrigerant in these photovoltaic and solar thermal modules, so that the internal refrigerant reaches the target vaporization state as much as possible when flowing out of the photovoltaic and solar thermal module.

[0047] In an optional embodiment, step S302, controlling the opening degree of the switching module corresponding to each photovoltaic thermal module based on the power generation of each photovoltaic thermal module and the detection data of each photovoltaic thermal module, further includes: The power generation of each photovoltaic and solar thermal module is compared with a preset power threshold. Turn off the switching modules corresponding to photovoltaic thermal modules whose power generation is less than the preset power threshold.

[0048] Specifically, the aforementioned preset power threshold can be determined based on the performance parameters of the photovoltaic thermal module. For example, if the maximum power generation of the photovoltaic thermal module is only 300W, then the preset power threshold can be 280W or 270W as a reference value. If it does not meet the standard, it indicates that there is an abnormality in the photovoltaic thermal module.

[0049] The main control module can also compare the power generation of each photovoltaic thermal module with a preset power threshold. If there is a photovoltaic thermal module whose power generation is less than the preset power threshold, it indicates that there is an abnormality in this part of the photovoltaic thermal module. At this time, the switch module corresponding to the photovoltaic thermal module whose power generation is less than the preset power threshold can be turned off, thereby improving the stability and overall performance of the heat pump system.

[0050] In an optional embodiment, the heat pump system further includes a refrigerant pump, and each detection module further includes a pressure detection unit; the control method of the heat pump system further includes: The pressure values ​​collected by each pressure detection unit are obtained, and the overall pressure value is determined based on the pressure values ​​collected by each pressure detection unit. If the overall pressure value is less than the preset pressure threshold, increase the operating frequency of the refrigerant pump.

[0051] Specifically, the main control module can control the operating frequency of the refrigerant pump based on the pressure values ​​collected by each pressure detection unit. Specifically, the main control module can acquire the pressure values ​​collected by each pressure detection unit and calculate the average value to determine the overall pressure value in the parallel pipeline. This overall pressure value is then compared with a preset pressure threshold. This preset pressure threshold can be set according to actual needs and is not specifically limited here. If the overall pressure value is less than the preset pressure threshold, the operating frequency of the refrigerant pump is increased to pressurize the parallel pipeline, thereby ensuring that the pressure value in the parallel pipeline reaches the preset pressure threshold, allowing the refrigerant to flow smoothly within each photovoltaic thermal module.

[0052] As an optional embodiment, the control flow of the heat pump system provided in this application embodiment can be as follows: Figure 4As shown. Specifically, when the heat pump system operates, the PVT module will generate electricity and heat simultaneously. The power generation part is mainly affected by irradiance, which is further reflected in the changes in the voltage and current of the PVT module. The change in the power generation part is more sensitive than that in the heat generation part. Therefore, the power generation power of the PVT module is selected as the monitoring value to control the operation of the heat pump system. In the case of the same PVT module, the characterized parameters are basically the same, and the displayed power generation power is basically the same. When the power generation power of one PVT module is not equal to that of the other PVT modules, it indicates that there is a change in the irradiance of this PVT module. When P1 = min{P1, P2, P3, P4...} (where Pi represents the power generation power of the i-th PVT module), it indicates that the irradiance of the PVT module corresponding to P1 is relatively low. At this time, the heat exchange capacity of the PVT module corresponding to P1 is relatively low. To improve the heat exchange capacity of the PVT module corresponding to P1, the outlet temperature T_out of P1 (i.e., the second temperature value in the above text) can be monitored and compared with the preset value T_ref. This preset value T_ref is related to the type of refrigerant selected and is the critical value from liquid to gas at a certain pressure. When T_out < T_ref, it indicates that the refrigerant has not reached the target vaporization state inside the PVT module corresponding to P1. At this time, the flow rate of the refrigerant inside the PVT module corresponding to P1 needs to be reduced, and the opening of the expansion valve (i.e., the switch module in the above text) needs to be reduced. On the contrary, the opening of the expansion valve needs to be increased. This situation also applies to the case when the PVT module is shaded.

[0053] When P1 = P2 = P3..., it indicates that the irradiance received by each PVT module is relatively consistent, and the heat exchange capacity of each PVT module is also basically the same. At this time, the temperature values at the inlets of each PVT module (i.e., the refrigerant inlet ends in the above text) need to be monitored. Since there is also an influence of temperature in the pipeline during parallel connection, the temperatures of T_in1 and T_inN are inconsistent. When the temperature of T_in1 is higher than the inlet temperatures of other PVT modules (i.e., the first temperature value in the above text), it indicates that the refrigerant has absorbed a part of the heat when entering the PVT module corresponding to T_in1. At this time, when the PVT module corresponding to T_in1 exchanges heat, the opening of the expansion valve can be adjusted to increase the flow rate of the refrigerant to compensate for the absorbed heat.

[0054] When P1 < P_ref, it indicates that the power generation of the PVT module corresponding to P1 is abnormal, and the expansion valve needs to be closed. To better match the pressures of each parallel part, the pressures at the inlets of the expansion valves of each PVT module are monitored. When the comprehensive pressure value M < M_ref, it indicates that the pressure in the parallel pipeline is insufficient. At this time, the frequency of the refrigerant pump needs to be adjusted to increase the pressure. The operation of the refrigerant pump is synchronously linked with the compressor of the heat pump to maintain the stability of the entire heat pump system.

[0055] The heat pump system in this application, by connecting multiple PVT modules in parallel and monitoring each PVT module, converts changes in irradiance into changes in photovoltaic power. On the one hand, it solves the problem of irradiance monitoring based on photovoltaic power consumption, reducing engineering costs; on the other hand, by utilizing the rapid response of power generation, it adjusts the flow rate and temperature of the refrigerant entering each PVT module in real time, improving the heat exchange efficiency of the PVT modules. Furthermore, by externalizing the control section of the heat pump system, it reduces the complexity of heat pump system control and allows for rapid matching with heat pump air conditioning units of different performance levels, improving engineering feasibility.

[0056] In addition, embodiments of this application also provide a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the control method of the heat pump system as provided in any of the foregoing method embodiments.

[0057] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0058] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software plus a general-purpose hardware platform, or of course, using hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0059] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0060] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A heat pump system, characterized in that, The heat pump system includes: a main control module, a heat pump air conditioning unit, N photovoltaic thermal modules arranged in parallel, and N sub-control modules, N detection modules and N switch modules arranged corresponding to the N photovoltaic thermal modules. Each photovoltaic thermal module is respectively arranged with one sub-control module, one detection module and one switch module, and N is any integer greater than 1. The heat pump air conditioning unit includes an evaporator, a compressor, a condenser, and an electronic expansion valve connected in series. The refrigerant input end of each photovoltaic thermal module is connected to a first refrigerant pipeline between the condenser and the electronic expansion valve, and the refrigerant output end of each photovoltaic thermal module is connected to a second refrigerant pipeline between the evaporator and the compressor. Each of the sub-control modules is electrically connected to its corresponding photovoltaic thermal module. Each of the sub-control modules, detection modules, and switch modules is electrically connected to the main control module. The main control module is used to acquire the power generation of each photovoltaic thermal module collected by each of the sub-control modules and the detection data of each photovoltaic thermal module collected by each of the detection modules. Based on the power generation of each photovoltaic thermal module and the detection data of each photovoltaic thermal module, the main control module controls the opening degree of the switch module corresponding to each photovoltaic thermal module.

2. The heat pump system according to claim 1, characterized in that, Each of the aforementioned detection modules includes a first temperature detection unit; Each of the first temperature detection units is respectively set at the refrigerant input terminal of the corresponding photovoltaic thermal module, and each of the first temperature detection units is used to collect the first temperature value of the refrigerant flowing into each of the photovoltaic thermal modules. Each of the first temperature detection units is electrically connected to the main control module. The main control module is used to control the opening degree of the switch module corresponding to each photovoltaic thermal module based on the power generation of each photovoltaic thermal module and the first temperature value of the refrigerant flowing into each photovoltaic thermal module.

3. The heat pump system according to claim 2, characterized in that, Each of the aforementioned detection modules further includes a second temperature detection unit; Each of the second temperature detection units is respectively set at the refrigerant output terminal of the corresponding photovoltaic thermal module, and each of the second temperature detection units is used to collect the second temperature value of the refrigerant flowing out of each photovoltaic thermal module. Each of the second temperature detection units is electrically connected to the main control module. The main control module is used to control the opening degree of the switch module corresponding to each photovoltaic thermal module based on the power generation of each photovoltaic thermal module and the second temperature value of the refrigerant flowing out of each photovoltaic thermal module.

4. The heat pump system according to claim 3, characterized in that, The heat pump system also includes a refrigerant pump, which is connected in series between the refrigerant input terminal of each photovoltaic thermal module and the first refrigerant pipeline. Each detection module also includes a pressure detection unit. Each of the pressure detection units is located at the refrigerant input end of its corresponding photovoltaic thermal module; Each of the pressure detection units is electrically connected to the main control module, which controls the operating frequency of the refrigerant pump based on the pressure values ​​collected by each pressure detection unit.

5. A control method for a heat pump system, characterized in that, Applied to the heat pump system according to any one of claims 1-4, the method comprises: The power generation of each photovoltaic and solar thermal module is collected by each sub-control module and the detection data of each photovoltaic and solar thermal module is collected by each detection module. Based on the power generation of each photovoltaic and solar thermal module and the detection data of each photovoltaic and solar thermal module, the opening degree of the switch module corresponding to each photovoltaic and solar thermal module is controlled.

6. The method according to claim 5, characterized in that, The step of controlling the opening degree of the switch module corresponding to each photovoltaic thermal module based on the power generation of each photovoltaic thermal module and the detection data of each photovoltaic thermal module includes: When the power generation of each photovoltaic and solar thermal module is uniform, the first temperature value of the refrigerant flowing into each photovoltaic and solar thermal module is obtained, wherein the first temperature value is obtained based on the first temperature detection unit set at the refrigerant input end of each photovoltaic and solar thermal module. Based on the first temperature value, the opening degree of the switch module corresponding to each photovoltaic and solar thermal module is adjusted so that the temperature of the refrigerant flowing into each photovoltaic and solar thermal module tends to be consistent.

7. The method according to claim 5, characterized in that, The step of controlling the opening degree of the switch module corresponding to each photovoltaic thermal module based on the power generation of each photovoltaic thermal module and the detection data of each photovoltaic thermal module further includes: When the power generation of each photovoltaic and solar thermal module is uneven, a second temperature value of the refrigerant flowing out of each photovoltaic and solar thermal module is obtained, wherein the second temperature value is obtained based on the second temperature detection unit set at the refrigerant output end of each photovoltaic and solar thermal module; Compare the second temperature value with a preset temperature threshold; The opening degree of the switch module corresponding to the photovoltaic thermal module whose second temperature value is less than the preset temperature threshold is reduced until the second temperature value is greater than or equal to the preset temperature threshold.

8. The method according to claim 5, characterized in that, The step of controlling the opening degree of the switch module corresponding to each photovoltaic thermal module based on the power generation of each photovoltaic thermal module and the detection data of each photovoltaic thermal module further includes: The power generation of each photovoltaic and solar thermal module is compared with a preset power threshold. The switching module corresponding to the photovoltaic thermal module whose power generation is less than the preset power threshold is turned off.

9. The method according to claim 5, characterized in that, The heat pump system further includes a refrigerant pump, and each of the detection modules further includes a pressure detection unit; the method further includes: The pressure values ​​collected by each pressure detection unit are obtained, and a comprehensive pressure value is determined based on the pressure values ​​collected by each pressure detection unit. If the overall pressure value is less than a preset pressure threshold, increase the operating frequency of the refrigerant pump.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the control method of the heat pump system according to any one of claims 5-9.

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