Photovoltaic-thermal system

Abstract

Disclosed in the present application is a photovoltaic-thermal system, comprising a photovoltaic module, a refrigerant circulation system, a detection component and a controller, wherein the refrigerant circulation system comprises a first heat exchanger, a second heat exchanger, a third heat exchanger, a first control valve, and a second control valve, the first heat exchanger being connected to the second heat exchanger via the first control valve to form a first circulation loop, the first heat exchanger being connected to the third heat exchanger via the second control valve to form a second circulation loop, and the third heat exchanger exchanging heat with the photovoltaic module; the detection component is configured to output detection parameters; and the controller is connected to the detection component, and is configured to control the opening degrees of the first control valve and the second control valve on the basis of the detection parameters. In this way, the present application can reduce the operating temperature of the photovoltaic module, thereby improving the utilization efficiency of solar energy, and can also realize flexible allocation of heat exchange rates among the heat exchangers in the system.

Description

Photovoltaic photothermal system

[0001] The present application claims priority to the Chinese patent application No. 2024111353458, filed on August 16, 2024, and entitled "Photovoltaic photothermal system", which is incorporated by reference in its entirety.

TECHNICAL FIELD

[0002] The present application relates to the technical field of thermal management, in particular to a photovoltaic photothermal system.

BACKGROUND

[0003] Solar energy, as the most accessible and most widely distributed renewable energy, has attracted more and more attention. With the innovation of materials and technology, the technology of using photovoltaic modules for power generation has gradually emerged. However, the working temperature of photovoltaic modules increases, and the power generation efficiency decreases, resulting in low utilization rate of solar energy. The power generation efficiency of photovoltaic modules is generally about 20%, and the remaining 80% of energy is dissipated in the environment in the form of waste heat, which also causes the working temperature of photovoltaic modules to rise and wastes resources.

SUMMARY

[0004] The technical problem solved by the present application is to provide a photovoltaic photothermal system that can reduce the working temperature of photovoltaic modules to improve the utilization rate of solar energy and achieve flexible configuration of the heat exchange capacity of each heat exchanger in the system.

[0005] To solve the above technical problem, the present application provides a photovoltaic photothermal system, which comprises a photovoltaic module, a refrigerant circulation system, a detection component and a controller. The refrigerant circulation system comprises a first heat exchanger, a second heat exchanger, a third heat exchanger, a first control valve and a second control valve. The first heat exchanger is connected with the second heat exchanger through the first control valve and forms a first circulation loop. The first heat exchanger is connected with the third heat exchanger through the second control valve and forms a second circulation loop. The third heat exchanger exchanges heat with the photovoltaic module. The detection component is used to output a detection parameter. The controller is connected with the detection component and is used to control the opening degree of the first control valve and the second control valve based on the detection parameter.

[0006] Among them, the detection parameter is at least partially used to represent the light intensity, and the controller is used to control the opening degree of the first control valve and the second control valve based on the light intensity represented by the detection parameter.

[0007] Among them, the detection component comprises a first temperature sensor arranged between the first input end of the third heat exchanger and the photovoltaic module. The first temperature sensor is used to detect the first temperature of the heat exchange medium flowing into the first input end of the third heat exchanger. The first temperature is used to represent the light intensity.

[0008] Among them, the detection component further comprises a power generation amount detection component for detecting the power generation amount of the photovoltaic module. The power generation amount is used to represent the light intensity.

[0009] The detection component comprises a first temperature sensor arranged between the first input end of the third heat exchanger and the photovoltaic module, and a power generation amount detection component for detecting the power generation amount of the photovoltaic module; the first temperature sensor is used for detecting the first temperature of the heat exchange medium flowing into the first input end of the third heat exchanger; the controller is used for calculating the light intensity based on the first temperature and the power generation amount.

[0010] The detection component further comprises a second temperature sensor arranged between the first output end of the third heat exchanger and the photovoltaic module, and the second temperature sensor is used for detecting the second temperature of the heat exchange medium flowing out of the second output end of the third heat exchanger; the controller is used for calculating the light intensity based on the first temperature, the second temperature and the power generation amount.

[0011] The controller is used for controlling the opening degree of the second control valve based on the target heat exchange amount of the third heat exchanger, and controlling the opening degree of the first control valve based on the opening degree of the second control valve; wherein the target heat exchange amount is determined by the light intensity.

[0012] The controller is used for determining the target heat exchange amount of the third heat exchanger based on the light intensity and the heat load of the first heat exchanger.

[0013] The controller controls the opening degree of the second control valve so that the actual heat exchange amount of the third heat exchanger approaches the target heat exchange amount; the detection component comprises a first temperature sensor arranged between the first input end of the third heat exchanger and the photovoltaic module, and a second temperature sensor arranged between the first output end of the third heat exchanger and the photovoltaic module, and the temperature difference output by the first temperature sensor and the second temperature sensor is used to represent the actual heat exchange amount.

[0014] The controller controls the opening degree of the second control valve so that the actual heat exchange amount of the third heat exchanger approaches the target heat exchange amount, comprising: increasing the opening degree of the second control valve in response to the target heat exchange amount being greater than the actual heat exchange amount; and / or, decreasing the opening degree of the second control valve in response to the target heat exchange amount being less than the actual heat exchange amount.

[0015] The controller is used for increasing or decreasing the opening degree of the first control valve based on the opening degree of the second control valve and the supercooling degree of the second heat exchanger.

[0016] The photovoltaic-thermal system is provided with a first light intensity threshold value and a second light intensity threshold value, the controller is configured to switch to a first heating mode in response to the light intensity being not less than the first light intensity threshold value, wherein the first control valve is closed and the second control valve is opened; the controller is configured to switch to a second heating mode in response to the light intensity being less than the second light intensity threshold value, wherein the first control valve is opened and the second control valve is closed; the controller is configured to switch to a third heating mode in response to the light intensity being between the first light intensity threshold value and the second light intensity threshold value, wherein the first control valve and the second control valve are both opened; and the first light intensity threshold value is greater than the second light intensity threshold value.

[0017] The controller is configured to adjust the first light intensity threshold value and / or the second light intensity threshold value based on the heat load of the first heat exchanger.

[0018] The input end of the second heat exchanger is connected with the output end of the first heat exchanger through the first control valve, and the output end of the second heat exchanger is connected with the input end of the first heat exchanger; the second input end of the third heat exchanger is connected with the output end of the first heat exchanger through the second control valve, and the second output end of the third heat exchanger is connected with the input end of the first heat exchanger.

[0019] The refrigerant circulation system further comprises a compressor, and the output end of the second heat exchanger and the second output end of the third heat exchanger are both connected with the input end of the first heat exchanger through the compressor, wherein the connection of the compressor with at least two of the first heat exchanger, the second heat exchanger and the third heat exchanger is realized by using a multi-way valve.

[0020] At least one of the first control valve and the second control valve is any one of an expansion valve, a throttle valve and a capillary tube.

[0021] The photovoltaic-thermal system further comprises at least one of a photovoltaic-side pump body, a heat storage device and an electric energy conversion circuit, the photovoltaic-side pump body is arranged between the photovoltaic module and the third heat exchanger and is used to drive the flow of a heat exchange medium between the photovoltaic module and the third heat exchanger; the heat storage device is arranged between the photovoltaic module and the third heat exchanger; and the electric energy conversion circuit is electrically connected with the photovoltaic module and the controller and is used to convert the electric energy output by the photovoltaic module into alternating current.

[0022] The photovoltaic module further comprises a heat collector; or the third heat exchanger is a fluorine cooling plate heat collector.

[0023] The second heat exchanger is an air source heat exchanger taking air as a heat source.

[0024] The third heat exchanger is a medium source heat exchanger taking a heat exchange medium as a heat source.

[0025] The second heat exchanger and the first control valve are multiple groups; the first heat exchanger is connected with the second heat exchanger in the same group through the first control valve of each group, forming multiple first circulation loops; or the number of the second heat exchanger is multiple, and the multiple second heat exchangers are connected in series, and the first heat exchanger is connected with the series sequence formed by the multiple second heat exchangers through the first control valve.

[0026] The beneficial effects of the present application are: different from the prior art, the third heat exchanger in the photovoltaic and light heat system provided by the present application exchanges heat with the photovoltaic module, so as to utilize the heat generated by the photovoltaic module, reduce the temperature of the photovoltaic module, and improve the power generation of the photovoltaic module, so as to improve the utilization rate of solar energy. Further, by setting the detection component, the opening of the first control valve and the second control valve is controlled according to the detection parameter of the detection component, and then the amount of refrigerant entering the second heat exchanger and the third heat exchanger is controlled, so as to realize flexible distribution of the heat exchange amount of each heat exchanger. BRIEF DESCRIPTION OF DRAWINGS

[0027] Fig. 1 is a structural schematic diagram of an embodiment of the photovoltaic and light heat system provided by the present application;

[0028] Fig. 2 is a structural schematic diagram of another embodiment of the photovoltaic and light heat system provided by the present application;

[0029] Fig. 3 is a schematic diagram of an embodiment of the connection mode of the compressor 27 and the third heat exchanger 23 and the second heat exchanger 22;

[0030] Fig. 4 is a schematic diagram of another embodiment of the connection mode of the compressor 27 and the third heat exchanger 23 and the second heat exchanger 22;

[0031] Fig. 5 is a flowchart of an embodiment of the control method of the photovoltaic and light heat system provided by the present application;

[0032] Fig. 6 is a schematic diagram of the framework structure of an embodiment of the electronic device provided by the present application;

[0033] Fig. 7 is a schematic diagram of the framework structure of an embodiment of the computer readable storage medium provided by the present application.

DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] It should be noted that the terms "first", "second", and the like in the description of embodiments of the present application are used only for the purpose of description, and should not be construed as indicating or implying that a relative importance or a specific number of the technical features indicated. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features.

[0036] In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly and specifically limited. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components, if the specific posture (as shown in the drawings) changes, the directional indications also change accordingly. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0037] In this document, the term "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily mutually exclusive or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] Please refer to FIG. 1, which is a structural schematic diagram of an embodiment of a photovoltaic-photothermal system provided by the present application.

[0039] In an embodiment, the photovoltaic-photothermal system 100 includes a photovoltaic assembly 1, a refrigerant circulation system 2, a detection component 3 and a controller 4. The photovoltaic assembly 1 can also be referred to as a PVT assembly, and the photovoltaic assembly 1 can generate electricity using solar energy. Specifically, the photovoltaic assembly 1 can include a heat collector, and a heat exchange medium can flow in the heat collector to absorb heat on the photovoltaic assembly 1. The heat collector can be a flat plate heat exchanger, which is in contact with the back of a conventional photovoltaic panel through a certain processing method, such as welding, and the flat plate heat exchanger has a heat exchange medium flowing therein. The heat collector collects heat generated by the photovoltaic panel through the flowing heat exchange medium. In a specific embodiment, the flat plate heat exchanger can include a water cooling plate containing a pipeline, and the heat exchange medium can flow in the pipeline to absorb heat of the photovoltaic panel.

[0040] The refrigerant circulation system 2 comprises a first heat exchanger 21, a second heat exchanger 22, a third heat exchanger 23, a first control valve 24 and a second control valve 25. The first heat exchanger 21 is connected with the second heat exchanger 22 through the first control valve 24 and forms a first circulation loop. The first heat exchanger 21 is connected with the third heat exchanger 23 through the second control valve 25 and forms a second circulation loop. The third heat exchanger 23 exchanges heat with the photovoltaic module 1. Specifically, the input end of the second heat exchanger 22 is connected with the output end of the first heat exchanger 21 through the first control valve 24, and the output end of the second heat exchanger 22 is connected with the input end of the first heat exchanger 21. The second input end of the third heat exchanger 23 is connected with the output end of the first heat exchanger 21 through the second control valve 25, and the second output end of the third heat exchanger 23 is connected with the input end of the first heat exchanger 21. The first input end and the first output end of the third heat exchanger 23 are connected with the photovoltaic module 1.

[0041] Through the first circulation loop, the second heat exchanger 22 can transfer heat from a heat source to the first heat exchanger 21. The heat source can be an air source, a water source, a ground source, etc. Through the second circulation loop, the third heat exchanger 23 can transfer heat from the photovoltaic module 1 to the first heat exchanger 21. The first heat exchanger 21 can transfer the received heat to a use object that needs heat. The heat from the photovoltaic module 1 can be transferred to the third heat exchanger 23 through a heat exchange medium. The heat exchange medium can circulate between the photovoltaic module 1 and the third heat exchanger 23 to achieve heat transfer.

[0042] In an embodiment, the second heat exchanger 22 can be an air source heat exchanger using air as a heat source, and the third heat exchanger 23 can be a medium source heat exchanger using a heat exchange medium as a heat source. The heat exchange medium can be at least one of water, liquid sodium, heat conduction liquid, ethylene glycol, etc. In an embodiment, the heat exchange medium is a mixture of water and ethylene glycol. It can be understood that the photovoltaic thermal system 100 can comprise one or more second heat exchangers 22. Multiple second heat exchangers 22 can use the same or different heat sources. If the photovoltaic thermal system 100 comprises multiple second heat exchangers 22, the multiple second heat exchangers 22 can be connected in parallel or in series.

[0043] In an embodiment, the multiple second heat exchangers 22 are connected in parallel. Specifically, the number of second heat exchangers 22 and first control valves 24 is multiple groups. Each group comprises one second heat exchanger 22 and one first control valve 24. The first heat exchanger 21 is connected with the second heat exchanger 22 in the same group through the first control valve 24 of each group, forming multiple first circulation loops. The first control valve 24 of each group can control the amount of refrigerant entering the second heat exchanger 22 in the same group. It can be understood that in each first circulation loop, the input end of the second heat exchanger 22 is connected with the output end of the first heat exchanger 21 through the first control valve 24, and the output end of the second heat exchanger 22 is connected with the input end of the first heat exchanger 21.

[0044] In another embodiment, the plurality of second heat exchangers 22 are connected in series, and the first heat exchanger 21 is connected to the series of the plurality of second heat exchangers 22 through a first control valve 24. Specifically, the input end of one of the plurality of second heat exchangers 22 at one end of the series is connected to the output end of the first heat exchanger 21 through the first control valve 24, and the output end of another of the plurality of second heat exchangers 22 at the other end of the series is connected to the input end of the first heat exchanger 21. The first control valve 24 and the second control valve 25 can be any one of an expansion valve, a throttle valve, a capillary, and a stop valve. Understandably, the first control valve 24 and the second control valve 25 can be the same or different. For example, both of them are expansion valves, or one of them is an expansion valve and the other is a throttle valve.

[0045] The detection component 3 is configured to output a detection parameter, which can represent at least one of the light intensity and the heat. In an embodiment, part of the detection parameters can represent the light intensity. Correspondingly, the detection component 3 comprises a light intensity detection component configured to detect a parameter representing the light intensity, which includes but is not limited to a luminometer, a light meter, a temperature sensor, a power generation detection component, etc., and the power generation detection component includes but is not limited to a generator set test device, a generator test bench, a power generation tester, etc.

[0046] In a specific embodiment, the detection component 3 comprises a first temperature sensor 31, which can be arranged between the first input end of the third heat exchanger 23 and the photovoltaic module 1, and is configured to detect a first temperature of the heat exchange medium flowing into the first input end of the third heat exchanger 23, which can be used to represent the light intensity.

[0047] In another specific embodiment, the detection component 3 comprises a power generation detection component configured to detect the power generation of the photovoltaic module 1, which can be used to represent the light intensity. The power generation detection component can be connected to the photovoltaic module 1 to determine the power generation of the photovoltaic module 1.

[0048] In other specific embodiments, the detection component 3 can comprise the first temperature sensor 31 and the power generation detection component. The controller 4 can calculate the light intensity based on the first temperature detected by the first temperature sensor 31 and the power generation detected by the power generation detection component.

[0049] The controller 4 is connected to the detection component 3 and is configured to control the opening degrees of the first control valve 24 and the second control valve 25 based on the detection parameter output by the detection component 3. Specifically, the greater the opening degree of the first control valve 24, the greater the heat exchange amount of the second heat exchanger 22; the greater the opening degree of the second control valve 25, the greater the heat exchange amount of the third heat exchanger 23.

[0050] In an embodiment, the detection parameter is used at least partially to represent the light intensity, and the controller 4 can control the opening degree of the first control valve 24 and the second control valve 25 based on the light intensity represented by the detection parameter. When the light intensity increases, the photovoltaic module 1 generates more heat, and the third heat exchanger 23 in heat exchange with the photovoltaic module 1 can exchange more heat, so the opening degree of the second control valve 25 can be increased to increase the flow of refrigerant through the second control valve 25 to increase the heat exchange amount of the third heat exchanger 23; conversely, if the light intensity decreases, the opening degree of the second control valve 25 can be decreased. The opening degree of the first control valve 24 can be adjusted based on the opening degree of the second control valve 25, for example, in the case that the heat load of the first heat exchanger 21 is fixed, the opening degree of the second control valve 25 is increased, and the opening degree of the first control valve 24 is decreased; conversely, the opening degree of the second control valve 25 is decreased, and the opening degree of the first control valve 24 is increased. In the case that the heat load of the first heat exchanger 21 changes, the opening degree of the second control valve 25 can be determined based on the light intensity first to determine the actual heat exchange amount of the third heat exchanger 23, and then the target heat exchange amount of the second heat exchanger 22 can be determined based on the heat load of the first heat exchanger 21 and the actual heat exchange amount of the third heat exchanger 23, and the opening degree of the first control valve 24 can be adjusted according to the target heat exchange amount of the second heat exchanger 22.

[0051] Since the photovoltaic module 1 generates 0.4% less power for each 1℃ increase in operating temperature, and the photovoltaic module 1 generally generates about 20% power, the remaining 80% of the energy is dissipated in the form of waste heat in the environment, which also causes the operating temperature of the photovoltaic module 1 to increase and wastes energy. The third heat exchanger 23 in the photovoltaic-thermal system 100 provided by the above-mentioned method is in heat exchange with the photovoltaic module 1 to utilize the heat generated by the photovoltaic module 1, which can reduce the temperature of the photovoltaic module 1, increase the power generation of the photovoltaic module 1, and thus improve the utilization rate of solar energy. Further, by providing the detection component 3, the opening degrees of the first control valve 24 and the second control valve 25 are controlled according to the detection parameter of the detection component 3, and the amount of refrigerant entering the second heat exchanger and the third heat exchanger is controlled, so that the heat exchange amounts of the heat exchangers are flexibly distributed. In an embodiment, the heat exchange amount of the heat exchanger with better performance can be preferentially ensured to meet the requirements, so that the performance of the photovoltaic-thermal system can be improved.

[0052] In an embodiment, the heat exchange amount of the third heat exchanger 23 (the heat of the photovoltaic module 1) can be preferentially ensured, and the heat exchange amount of the second heat exchanger 22 (the heat of other heat sources) can be supplemented. For example, the controller 4 controls the opening degrees of the first control valve 24 and the second control valve 25 based on the light intensity represented by the detection parameter, including: the controller 4 controls the opening degree of the second control valve 25 based on the target heat exchange amount of the third heat exchanger 23, and controls the opening degree of the first control valve 24 based on the opening degree of the second control valve 25.

[0053] Specifically, the controller 4 can obtain a target heat exchange amount of the third heat exchanger 23 based on the light intensity, and control the opening degree of the second control valve 25 based on the target heat exchange amount, so that after adjusting the opening degree of the second control valve 25, the actual heat exchange amount of the third heat exchanger 23 approaches the target heat exchange amount. The target heat exchange amount of the third heat exchanger 23 is related to the light intensity, and a relationship formula or a relationship table of the target heat exchange amount of the third heat exchanger 23 and the light intensity can be established in advance. Then, according to the relationship and the currently determined light intensity, the current target heat exchange amount of the third heat exchanger 23 is obtained. In an embodiment, the greater the light intensity, the greater the target heat exchange amount.

[0054] In a specific embodiment, the target heat exchange amount of the third heat exchanger 23 is also related to the heat load of the first heat exchanger 21, and the controller 4 can determine the target heat exchange amount of the third heat exchanger 23 based on the light intensity and the heat load of the first heat exchanger. The greater the heat load, the greater the target heat exchange amount. Specifically, a relationship table of the target heat exchange amount of the third heat exchanger 23 and the light intensity and the heat load of the first heat exchanger 21 can be set in advance, and the controller 4 can look up the table to obtain the target heat exchange amount of the third heat exchanger 23.

[0055] When the opening degree of the second control valve 25 is determined, the opening degree of the first control valve 24 can be controlled based on the opening degree of the second control valve 25. When the opening degree of the second control valve 25 is determined and the actual heat exchange amount of the third heat exchanger 23 is determined, the target heat exchange amount of the second heat exchanger 22 can be obtained according to the difference between the heat load of the first heat exchanger 21 and the actual heat exchange amount of the third heat exchanger 23, and the opening degree of the first control valve 24 is adjusted according to the target heat exchange amount of the second heat exchanger 22.

[0056] In a specific embodiment, the opening degree of the first control valve 24 is also related to the supercooling degree of the second heat exchanger 22, and the controller 4 can increase or decrease the opening degree of the first control valve 24 based on the opening degree of the second control valve 25 and the supercooling degree of the second heat exchanger 22. For example, after the opening degree of the second control valve 25 is determined, the opening degree of the first control valve 24 is increased in response to the current supercooling degree being greater than the target supercooling degree, and the opening degree of the first control valve 24 is decreased in response to the current supercooling degree being less than the target supercooling degree. The target supercooling degree can be set in advance, for example, a relationship table of the target heat exchange amount of the second heat exchanger 22 and the target supercooling degree can be set, and the target supercooling degree is obtained by looking up the table according to the target heat exchange amount of the second heat exchanger 22.

[0057] In the above embodiments, if the detection component 3 includes the first temperature sensor 31, the first temperature detected by the first temperature sensor 31 can be used to represent the light intensity; if the detection component 3 includes the power generation detection component, the power generation detected by the power generation detection component can be used to represent the light intensity; if the detection component 3 includes the first temperature sensor 31 and the power generation detection component, the controller can calculate the light intensity based on the first temperature and the power generation. Specifically, the first temperature and the power generation can be substituted into a first light intensity function to obtain the light intensity; the first light intensity function can be fitted by using a large amount of first temperature, power generation, and light intensity data. For example, N sets of data can be obtained, each set of data including a first temperature, a power generation, and a light intensity, N being at least greater than 2, and the first light intensity function can be fitted by using the N sets of data in a data fitting manner. The data fitting manner includes but is not limited to polynomial fitting, least squares method, interpolation method, curve fitting, non-parametric fitting, and Bayesian fitting.

[0058] Please continue to refer to FIG. 1. In an embodiment, the detection component 3 further includes a second temperature sensor 32 in addition to the first temperature sensor 31 and the power generation detection component. The second temperature sensor 32 is arranged between the first output end of the third heat exchanger 23 and the photovoltaic module 1, and is used to detect the second temperature of the heat exchange medium flowing out of the second output end of the third heat exchanger 23.

[0059] The light intensity can be calculated based on the first temperature, the second temperature, and the power generation. Specifically, the first temperature, the second temperature, and the power generation can be substituted into a second light intensity function to obtain the light intensity; the second light intensity function can be fitted by using a large amount of first temperature, second temperature, power generation, and light intensity data. For example, M sets of data can be obtained, each set of data including a first temperature, a second temperature, a power generation, and a light intensity, M being at least greater than 2, and the second light intensity function can be fitted by using the M sets of data in a data fitting manner. Similarly, the data fitting manner includes but is not limited to polynomial fitting, least squares method, interpolation method, curve fitting, non-parametric fitting, and Bayesian fitting.

[0060] The controller 4 controls the opening degree of the second control valve 25 based on the target heat exchange amount of the third heat exchanger 23, including: controlling the opening degree of the second control valve 25 to make the actual heat exchange amount of the third heat exchanger 23 approach the target heat exchange amount. The actual heat exchange amount can be determined based on the difference between the first temperature and the second temperature. Specifically, in response to the target heat exchange amount being greater than the actual heat exchange amount, the opening degree of the second control valve 25 is increased; in response to the target heat exchange amount being less than the actual heat exchange amount, the opening degree of the second control valve 25 is decreased.

[0061] In one embodiment, the target heat exchange amount and the actual heat exchange amount are represented by the temperature difference between the first temperature and the second temperature. According to the first current temperature output by the first temperature sensor 31, the target temperature difference is obtained from a preset table, and the actual temperature difference between the first current temperature and the second current temperature output by the second temperature sensor 32 is obtained. In response to the target temperature difference being greater than the actual temperature difference, the opening of the second control valve 25 is increased. In response to the target temperature difference being less than the actual temperature difference, the opening of the second control valve 25 is decreased. In this embodiment, the preset table represents the relationship between the first temperature and the target temperature difference.

[0062] In other embodiments, the target temperature difference is also affected by the heat load of the first heat exchanger 21. In this case, the preset table can represent the relationship between the first temperature, the heat load of the first heat exchanger 21, and the target temperature difference. As shown in Table 1, Δt1 to Δt15 represent different target temperature differences, Q1 to Q4 represent different heat loads of the first heat exchanger 21, and t1 to t7 represent different first temperatures. Δt1 to Δt15, Q1 to Q4, and t1 to t7 all increase in turn. As the first temperature increases, the target temperature difference increases. As the heat load increases, the target temperature difference increases. Understandably, each target temperature difference in Table 1 represents the temperature difference within a certain first temperature range or a certain heat load range. As shown in Table 1, when the heat load is Q1, the first temperature difference is t1, t2, or t3, and the target temperature difference is Δt1. Similarly, when the first temperature is t1, the heat load is Q1, Q2, Q3, or Q4, and the target temperature difference is Δt1.

[0063] Table 1 Relationship between first temperature, heat load of first heat exchanger 21, and target temperature difference

[0064] In one embodiment, the third heat exchanger 23 can be a medium source heat exchanger, and the second heat exchanger 22 can be an air source heat exchanger. The medium source heat exchanger is superior to the air source heat exchanger. By setting the target temperature difference and adjusting the opening of the second control valve 25 based on the target temperature difference and the actual temperature difference, the actual heat exchange amount of the third heat exchanger 23 can be close to the target heat exchange amount, so as to preferentially ensure the heat exchange amount of the third heat exchanger 23. Then, the opening of the first control valve 24 is adjusted to adjust the heat exchange amount of the second heat exchanger 22, so that the heat exchange amount of the third heat exchanger 23 and the heat exchange amount of the second heat exchanger 22 together meet the heat load of the first heat exchanger 21. By performing heat exchange amount distribution, the performance of the heat exchanger with better performance in the refrigerant circulation system is preferentially ensured to be optimal, so as to ensure that the performance of the refrigerant circulation system is optimal.

[0065] In an embodiment, the photovoltaic and photo-thermal system 100 is provided with a first light intensity threshold value and a second light intensity threshold value, the photovoltaic and photo-thermal system 100 is configured to include three working modes, the detection parameter is used at least in part to characterize the light intensity, the controller 4 is configured to switch to the first heating mode in response to the light intensity being not less than the first light intensity threshold value, in the first heating mode, the first control valve 24 is closed and the second control valve 25 is opened; switch to the second heating mode in response to the light intensity being less than the second light intensity threshold value, in the second heating mode, the first control valve 24 is opened and the second control valve 25 is closed; the controller is configured to switch to the third heating mode in response to the light intensity being between the first light intensity threshold value and the second light intensity threshold value, in the third heating mode, the first control valve 24 and the second control valve 25 are both opened; wherein the first light intensity threshold value is greater than the second light intensity threshold value.

[0066] It can be understood that after obtaining the detection parameter, the controller 4 can first determine the working mode of the photovoltaic and photo-thermal system 100 according to the light intensity characterized by the detection parameter, and enter the corresponding working mode by adjusting the opening and closing of the first control valve 24 and the second control valve 25. If the photovoltaic and photo-thermal system 100 is controlled to be in the third working mode, the opening degree of the first control valve 24 and the second control valve 25 can be further controlled based on the light intensity characterized by the detection parameter. The determination method of the light intensity is described above and will not be repeated here.

[0067] The first light intensity threshold value and / or the second light intensity threshold value can be set as needed, in an embodiment, the first light intensity threshold value and / or the second light intensity threshold value can be adjusted based on the heat load of the first heat exchanger 21, the greater the heat load of the first heat exchanger 21, the greater the first light intensity threshold value and / or the second light intensity threshold value. In a specific embodiment, when the heat load of the first heat exchanger 21 increases, the first light intensity threshold value and the second light intensity threshold value both increase.

[0068] Please refer to FIG. 1 and FIG. 2, FIG. 2 is a structural schematic diagram of another embodiment of the photovoltaic and photo-thermal system provided by the present application.

[0069] The refrigerant circulation system 2 can further include a compressor 27, the output end of the second heat exchanger 22 and the second output end of the third heat exchanger 23 are both connected to the input end of the first heat exchanger 21 through the compressor 27, wherein the connection of the compressor 27 with at least two of the first heat exchanger 21, the second heat exchanger 22 and the third heat exchanger 23 is realized by using a multi-way valve 26. The multi-way valve 26 can be a two-way valve, a three-way valve or a four-way valve, in a specific embodiment, a four-way valve can be used. The compressor 27 can process the gaseous refrigerant flowing out of the second heat exchanger 22 or the third heat exchanger 23 into a high-temperature and high-pressure state and deliver it to the first heat exchanger 21.

[0070] The connection mode of the compressor 27 and the second heat exchanger 22 and the third heat exchanger 23 includes that one of the second output end of the third heat exchanger 23 and the output end of the second heat exchanger 22 is connected to the gas inlet of the compressor 27, and the other is connected to the gas inlet of the compressor 27 through the first connection end pair of the multi-way valve 26, or the second output end of the third heat exchanger 23 and the output end of the second heat exchanger 22 are both connected to the gas inlet of the compressor 27 through the first connection end pair of the multi-way valve 26. The connection mode of the compressor 27 and the first heat exchanger 21 includes that the gas outlet of the compressor 27 is connected to the input end of the first heat exchanger 21 through the second connection end pair of the multi-way valve 26.

[0071] Please refer to FIG. 2 and FIG. 3, and FIG. 3 is a schematic diagram of an embodiment of the connection mode of the compressor 27 and the third heat exchanger 23 and the second heat exchanger 22.

[0072] The second output end of the third heat exchanger 23 is directly connected to the gas inlet of the compressor 27, and the output end of the second heat exchanger 22 is connected to the first port 261 of the multi-way valve 26. The first port 261 of the multi-way valve 26 and the second port 262 of the multi-way valve 26 are in communication, and the first port 261 of the multi-way valve 26 and the second port 262 of the multi-way valve 26 form the first connection end pair. The second port 262 of the multi-way valve 26 is connected to the gas inlet of the compressor 27, and the output end of the second heat exchanger 22 outputs refrigerant to the gas inlet of the compressor 27 through the first port 261 of the multi-way valve 26 and the second port 262 of the multi-way valve 26. The third port 263 of the multi-way valve 26 is connected to the gas outlet of the compressor 27, the third port 263 of the multi-way valve 26 and the fourth port 264 of the multi-way valve 26 are in communication, and the third port 263 and the fourth port 264 form the second connection end pair. The fourth port 264 is connected to the input end of the first heat exchanger 21, and the refrigerant processed by the compressor 27 flows to the input end of the first heat exchanger 21 through the third port 263 of the multi-way valve 26 and the fourth port 264 of the multi-way valve 26.

[0073] Please refer to FIG. 2 and FIG. 4, and FIG. 4 is a schematic diagram of another embodiment of the connection mode of the compressor 27 and the third heat exchanger 23 and the second heat exchanger 22.

[0074] The second output end of the third heat exchanger 23 and the output end of the second heat exchanger 22 are connected to the first port 261 of the multi-way valve 26, the first port 261 of the multi-way valve 26 and the second port 262 of the multi-way valve 26 are communicated, the first port 261 of the multi-way valve 26 and the second port 262 of the multi-way valve 26 form a first connection end pair, the second port 262 of the multi-way valve 26 is connected to the gas inlet of the compressor 27, and the refrigerant output by the second output end of the third heat exchanger 23 and the output end of the second heat exchanger 22 is mixed and then flows to the gas inlet of the compressor 27 through the first port 261 of the multi-way valve 26 and the second port 262 of the multi-way valve 26. The third port 263 of the multi-way valve 26 is connected to the gas outlet of the compressor 27, the third port 263 of the multi-way valve 26 and the fourth port 264 of the multi-way valve 26 are communicated, and the fourth port 264 is connected to the input end of the first heat exchanger 21; the refrigerant processed by the compressor 27 flows to the input end of the first heat exchanger 21 through the third port 263 of the multi-way valve 26 and the fourth port 264 of the multi-way valve 26.

[0075] Please continue to refer to FIG. 2, in an embodiment, the photovoltaic-thermal system 100 can further comprise at least one of a photovoltaic-side pump 5, a heat storage device (not shown in the figure), an electric energy conversion circuit 6, and a fan 28, the photovoltaic-side pump 5 is arranged between the photovoltaic module 1 and the third heat exchanger 23, and is used to drive the flow of the heat exchange medium between the photovoltaic module 1 and the third heat exchanger 23, in an embodiment, the photovoltaic-side pump 5 is arranged between the first output end of the third heat exchanger 23 and the photovoltaic module 1. The heat storage device is arranged between the photovoltaic module 1 and the third heat exchanger 23, in a specific embodiment, the heat storage device can be arranged between the photovoltaic module 1 and the first input end of the third heat exchanger 23. If the detection component 3 is the first temperature sensor 31, the heat storage device can be arranged between the photovoltaic module 1 and the first temperature sensor 31. When the second heat exchanger 22 is an air source heat exchanger, the photovoltaic-thermal system 100 can further comprise the fan 28, and the fan 28 is used to drive the flow of air. The electric energy conversion circuit 6 is electrically connected to the photovoltaic module 1 and the controller 4, and is used to convert the electric energy output by the photovoltaic module 1 into alternating current, and the electric energy conversion circuit 6 can be an inverter. If the detection component 3 comprises a power generation amount detection component, the power generation amount detection component can be connected to the electric energy conversion circuit 6 to measure the electric energy.

[0076] In an embodiment, the photovoltaic-thermal system 100 further comprises a use-side pump 7 and a use object 8, and the use object 8 is an object that uses heat. The first heat exchanger 21 can transfer the heat exchange amount of the third heat exchanger 23 and the second heat exchanger 22 to the use object 8, and the use-side pump 7 is arranged between the first heat exchanger 21 and the use object 8, and is used to drive the flow of the fluid between the first heat exchanger 21 and the use object 8.

[0077] In other embodiments, the third heat exchanger 23 in the above embodiments can also be a fluorine cold plate collector for collecting heat on the photovoltaic module 1. At this time, there is no need to set the third heat exchanger 23 and the collector. Among them, the flow medium in the fluorine cold plate collector can be refrigerant.

[0078] In a specific embodiment, as shown in FIG. 2, the photovoltaic light heat system 100 includes a photovoltaic module 1, a detection component 3, a controller 4, a photovoltaic side pump body 5, an electrical energy conversion circuit 6, a use side pump body 7, a use object 8, a first heat exchanger 21, a second heat exchanger 22, a third heat exchanger 23, a first control valve 24, a second control valve 25, a multi-way valve 26, a compressor 27, and a fan 28. Among them, the detection component 3 is a first temperature sensor 31 and a second temperature sensor 32, and the multi-way valve 26 is a four-way valve.

[0079] The first heat exchanger 21 and the third heat exchanger 23 include two input ends and two output ends. The first output end of the first heat exchanger 21 is connected with the first control valve 24 and the second control valve 25. The first control valve 24 is connected with the input end of the second heat exchanger 22. The second control valve 25 is connected with the second input end of the third heat exchanger 23. The second output end of the third heat exchanger 23 is connected with the air inlet of the compressor. The output end of the second heat exchanger 22 is connected with the first port of the four-way valve. The first port of the four-way valve is in communication with the second port. The second port of the four-way valve is connected with the air inlet of the compressor. The air outlet of the compressor is connected with the third port of the four-way valve. The third port is in communication with the fourth port. The fourth port of the four-way valve is connected with the first input end of the first heat exchanger 21. The first input end, the first output end of the third heat exchanger 23 and the photovoltaic module 1 are connected and form a circulation loop. The first temperature sensor 31 is arranged between the first input end of the third heat exchanger 23 and the photovoltaic module 1. The second temperature sensor 32 and the photovoltaic side pump body 5 are arranged between the first output end of the third heat exchanger 23 and the photovoltaic module 1. The second input end and the second output end of the first heat exchanger 21 are connected with the use object 8 and form a circulation loop. The use side pump body 7 is arranged between the first heat exchanger 21 and the use object 8.

[0080] When the photovoltaic and photo-thermal system 100 is in the first heat supply mode, the first control valve 24 is closed, the second control valve 25 is opened, the fan 28 is closed, the liquid refrigerant flows out through the first output end of the first heat exchanger 21, becomes a low-temperature and low-pressure two-phase state after passing through the second control valve 25, enters the third heat exchanger 23 through the second input end of the third heat exchanger 23, the photovoltaic side pump body 5 operates, so that the heat of the photovoltaic module 1 is taken to the third heat exchanger 23 through the heat exchange medium, and the refrigerant becomes a gaseous state after absorbing the heat of the photovoltaic module 1 in the third heat exchanger 23, flows to the gas inlet of the compressor 27 through the second output end of the third heat exchanger 23, the high-temperature and high-pressure refrigerant is discharged from the gas outlet of the compressor 27, reaches the first input end of the first heat exchanger 21 through the third port and the fourth port of the four-way valve, and becomes a liquid state after transferring heat to the water in the first heat exchanger 21. The water absorbing heat is output through the second output end of the first heat exchanger 21, and is transmitted to the use object 8 through the use side pump body 7. The heat exchange medium absorbs the heat of the photovoltaic module 1, enters the third heat exchanger 23 through the first input end of the third heat exchanger 23, and flows to the photovoltaic module 1 again through the first output end of the third heat exchanger 23 after heat exchange with the refrigerant in the third heat exchanger 23.

[0081] When the photovoltaic and photo-thermal system 100 is in the second heat supply mode, the first control valve 24 is opened, the second control valve 25 is closed, the fan 28 is opened, and the photovoltaic side pump body 5 is closed. The liquid refrigerant flows out through the first output end of the first heat exchanger 21, becomes a low-temperature and low-pressure two-phase state after passing through the first control valve 24, enters the second heat exchanger 22 through the input end of the second heat exchanger 22, and the fan 28 operates, so that the refrigerant becomes a gaseous state after absorbing the heat in the air, flows to the first port of the four-way valve through the output end of the second heat exchanger 22, enters the gas inlet of the compressor 27 through the first port and the second port of the four-way valve, and the high-temperature and high-pressure refrigerant is discharged from the gas outlet of the compressor 27, reaches the first input end of the first heat exchanger 21 through the third port and the fourth port of the four-way valve, and becomes a liquid state after transferring heat to the water in the first heat exchanger 21. The water absorbing heat is output through the second output end of the first heat exchanger 21, and is transmitted to the use object 8 through the use side pump body 7.

[0082] When the photovoltaic and photo-thermal system 100 is in the third heat supply mode, the first control valve 24, the second control valve 25, the fan 28 and the photovoltaic side pump body 5 are opened, the liquid refrigerant flows out from the first output end of the first heat exchanger 21, a part of the refrigerant becomes a low-temperature and low-pressure two-phase state after passing through the second control valve 25, enters the third heat exchanger 23 through the second input end of the third heat exchanger 23, and the photovoltaic side pump body 5 operates to make the heat of the photovoltaic module 1 carried to the third heat exchanger 23 through the heat exchange medium to exchange heat with the refrigerant, the refrigerant becomes a gaseous state after absorbing the heat of the photovoltaic module 1 in the third heat exchanger 23, and flows to the gas inlet of the compressor 27 through the second output end of the third heat exchanger 23; another part of the refrigerant becomes a low-temperature and low-pressure two-phase state after passing through the first control valve 24, enters the second heat exchanger 22 through the input end of the second heat exchanger 22, and the refrigerant becomes a gaseous state after absorbing the heat in the air in the second heat exchanger 22, flows to the first port of the four-way valve through the output end of the second heat exchanger 22, and enters the gas inlet of the compressor 27 through the first port and the second port of the four-way valve; the gaseous refrigerant flowing out of the third heat exchanger 23 and the second heat exchanger 22 is processed by the compressor 27, and high-temperature and high-pressure refrigerant is discharged from the gas outlet, the high-temperature and high-pressure refrigerant reaches the first input end of the first heat exchanger 21 through the third port and the fourth port of the four-way valve, and the high-temperature and high-pressure refrigerant becomes a liquid state after transferring heat to the water in the first heat exchanger 21 and flows out from the first output end of the first heat exchanger 21. The water absorbing heat in the first heat exchanger 21 is output through the second output end of the first heat exchanger 21 and is transmitted to the use object 8 through the use side pump body 7. The heat exchange medium absorbing the heat of the photovoltaic module 1 enters the third heat exchanger 23 through the first input end of the third heat exchanger 23, exchanges heat with the refrigerant in the third heat exchanger 23, and then flows to the photovoltaic module 1 through the first output end of the third heat exchanger 23 to absorb heat.

[0083] Referring to FIG. 5, FIG. 5 is a flowchart of an embodiment of the control method of the photovoltaic and photo-thermal system provided in the present application, and the method comprises:

[0084] S51: receiving a detection parameter output by a detection component in the photovoltaic and photo-thermal system.

[0085] S52: controlling the opening degree of the first control valve and the second control valve based on the detection parameter.

[0086] In the present application, the photovoltaic and photo-thermal system is any one of the photovoltaic and photo-thermal systems provided in the above embodiments. The detection parameter is at least partially used to represent the light intensity. The opening degree of the first control valve and the second control valve is controlled based on the light intensity represented by the detection parameter. Specifically, the target heat exchange amount of the third heat exchanger can be determined based on the light intensity, and the actual heat exchange amount of the third heat exchanger is controlled to approach the target heat exchange amount by adjusting the opening degree of the second control valve. Then, the opening degree of the first control valve is controlled based on the opening degree of the second control valve.

[0087] The embodiment can be performed by the controller in the photovoltaic and photo-thermal system, and the specific process of each step in the embodiment can refer to the specific process performed by the controller described above, which will not be repeated here. It can be understood that the embodiment can also be performed by another device.

[0088] Referring to FIG. 6, FIG. 6 is a schematic diagram of a framework structure of an embodiment of the electronic device provided in the present application.

[0089] The electronic device 60 includes a memory 601 and a processor 602, the memory 601 stores program instructions, and the processor 602 is configured to execute the program instructions stored in the memory 601 to implement the steps of any of the embodiments of the control method of the photovoltaic and photo-thermal system described above. In a specific implementation scenario, the electronic device 60 can include but is not limited to a microcomputer, a server, and in addition, the electronic device 60 can also include a notebook computer, a tablet computer and other mobile devices, which are not limited herein. In a specific embodiment, the electronic device 60 can include a controller in the photovoltaic and photo-thermal system.

[0090] Specifically, the processor 602 is configured to control itself and the memory 601 to implement the steps of any of the embodiments of the method described above. The processor 602 can also be referred to as a CPU (Central Processing Unit, central processing unit). The processor 602 can be an integrated circuit chip with processing capability. The processor 602 can also be a general-purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. In addition, the processor 602 can be implemented by an integrated circuit chip together.

[0091] Referring to FIG. 7, FIG. 7 is a schematic diagram of a framework structure of an embodiment of the computer-readable storage medium provided in the present application.

[0092] The computer-readable storage medium 70 stores program instructions 71, and the program instructions 71 are executed by the processor to implement the steps of any of the embodiments of the control method of the photovoltaic and photo-thermal system described above.

[0093] The computer readable storage medium 70 can specifically be a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store a computer program, or can be a server storing the computer program, which can send the stored computer program to other devices for running, or can run the stored computer program by itself.

[0094] If the technical solution of the present application involves personal information, the product applying the technical solution of the present application has been explicitly informed of the personal information processing rules before processing the personal information, and has obtained the personal independent consent. If the technical solution of the present application involves sensitive personal information, the product applying the technical solution of the present application has obtained the personal independent consent before processing the sensitive personal information, and at the same time meets the requirement of "explicit consent". For example, at the personal information collection device such as camera, a clear and prominent mark is set to inform that the personal information collection range has been entered, and the personal information will be collected. If the individual voluntarily enters the collection range, it is regarded as agreeing to collect the personal information. Or, on the device for processing personal information, the personal information processing rules are informed by using obvious marks / information, and the personal authorization is obtained by means of pop-up information or asking the individual to upload the personal information by himself. The personal information processing rules can include the personal information processor, the processing purpose of personal information, the processing method, and the type of processed personal information, and the like.

[0095] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A photovoltaic-photothermal system, characterized in that, The application relates to a photovoltaic module, a refrigerant circulation system, a detection component and a controller. The application relates to a photovoltaic module, a refrigerant circulation system, a detection component and a controller. The detection parameter is used to at least partially represent the illumination intensity, and the controller is used to control the opening degrees of the first control valve and the second control valve based on the illumination intensity represented by the detection parameter. The detection component comprises a first temperature sensor arranged between a first input end of the third heat exchanger and the photovoltaic module, and the first temperature sensor is used to detect a first temperature of heat exchange medium flowing into the first input end of the third heat exchanger, and the first temperature is used to represent the illumination intensity. The detection component further comprises a power generation amount detection component used to detect a power generation amount of the photovoltaic module, and the power generation amount is used to represent the illumination intensity.

2. The system of claim 1, wherein, The detection component comprises a first temperature sensor arranged between a first input end of the third heat exchanger and the photovoltaic module, and a power generation amount detection component used to detect a power generation amount of the photovoltaic module; the first temperature sensor is used to detect a first temperature of heat exchange medium flowing into the first input end of the third heat exchanger.

3. The system of claim 2, wherein, The controller is used to calculate the illumination intensity based on the first temperature and the power generation amount.

4. The system of claim 2, wherein, The detection component further comprises a second temperature sensor arranged between a first output end of the third heat exchanger and the photovoltaic module, and the second temperature sensor is used to detect a second temperature of heat exchange medium flowing out of the second output end of the third heat exchanger.

5. The system of claim 2, wherein, The controller is used to calculate the illumination intensity based on the first temperature, the second temperature and the power generation amount. The controller is used to control the opening degree of the second control valve based on a target heat exchange amount of the third heat exchanger, and control the opening degree of the first control valve based on the opening degree of the second control valve; wherein the target heat exchange amount is determined by the illumination intensity.

6. The system of claim 5, wherein, The controller is used to determine the target heat exchange amount of the third heat exchanger based on the illumination intensity and a heat load of the first heat exchanger. The controller controls the opening degree of the second control valve so that an actual heat exchange amount of the third heat exchanger approaches the target heat exchange amount.

7. The system of claim 2, wherein, The detection component comprises a first temperature sensor arranged between a first input end of the third heat exchanger and the photovoltaic module, and a second temperature sensor arranged between a first output end of the third heat exchanger and the photovoltaic module, and a temperature difference output by the first temperature sensor and the second temperature sensor is used to represent the actual heat exchange amount.

8. The system of claim 7, wherein, The controller controls the opening degree of the second control valve so that an actual heat exchange amount of the third heat exchanger approaches the target heat exchange amount, comprising:

9. The system of claim 7, wherein, ​ ​ 10. The system of claim 9, wherein, ​ in response to the target heat exchange amount being greater than the actual heat exchange amount, increasing the opening degree of the second control valve; and / or, in response to the target heat exchange amount being less than the actual heat exchange amount, decreasing the opening degree of the second control valve.

11. The system of claim 7, wherein, The controller is configured to increase or decrease the opening degree of the first control valve based on the opening degree of the second control valve and the supercooling degree of the second heat exchanger.

12. The system of claim 2, wherein, The photovoltaic-thermal system is provided with a first light intensity threshold and a second light intensity threshold, and the controller is configured to switch to a first heating mode in response to the light intensity being not less than the first light intensity threshold, wherein the first control valve is closed and the second control valve is opened. The controller is configured to switch to a second heating mode in response to the light intensity being less than the second light intensity threshold, wherein the first control valve is opened and the second control valve is closed. The controller is configured to switch to a third heating mode in response to the light intensity being between the first light intensity threshold and the second light intensity threshold, wherein the first control valve and the second control valve are both opened. The first light intensity threshold is greater than the second light intensity threshold.

13. The system of claim 12, wherein, The controller is configured to adjust the first light intensity threshold and / or the second light intensity threshold based on the heat load of the first heat exchanger.

14. The system of claim 1, wherein, The input end of the second heat exchanger is connected to the output end of the first heat exchanger via the first control valve, and the output end of the second heat exchanger is connected to the input end of the first heat exchanger. The second input end of the third heat exchanger is connected to the output end of the first heat exchanger via the second control valve, and the second output end of the third heat exchanger is connected to the input end of the first heat exchanger.

15. The system of claim 14, wherein, The refrigerant circulation system further comprises a compressor, and the output end of the second heat exchanger and the second output end of the third heat exchanger are both connected to the input end of the first heat exchanger via the compressor, wherein the connection between the compressor and at least two of the first heat exchanger, the second heat exchanger, and the third heat exchanger is achieved by using a multi-way valve.

16. The system of claim 1, wherein, At least one of the first control valve and the second control valve is any one of an expansion valve, a throttle valve, and a capillary tube.

17. The system of claim 1, wherein, The photovoltaic-thermal system further comprises at least one of: a photovoltaic-side pump body arranged between the photovoltaic module and the third heat exchanger, for driving the flow of a heat exchange medium between the photovoltaic module and the third heat exchanger; a heat storage device arranged between the photovoltaic module and the third heat exchanger; an electric energy conversion circuit electrically connected to the photovoltaic module and the controller, for converting the electric energy output by the photovoltaic module into alternating current.

18. The system of claim 1, wherein, The photovoltaic module further comprises a heat collector; or the third heat exchanger is a fluorine cooling plate heat collector.

19. The system of claim 1, wherein, The second heat exchanger is an air source heat exchanger using air as a heat source; and / or the third heat exchanger is a medium source heat exchanger using a heat exchange medium as a heat source.

20. The system of claim 1, wherein, The second heat exchanger and the first control valve are multiple groups; the first heat exchanger is connected with the second heat exchanger in the same group through the first control valve of each group, forming multiple first circulation loops; or, The number of the second heat exchanger is multiple, and they are connected in series with each other, and the first heat exchanger is connected with the series sequence formed by the multiple second heat exchangers through the first control valve.

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