Photovoltaic photo-thermal system

Abstract

The invention discloses a photovoltaic and photo-thermal system. The system comprises a photovoltaic module, a refrigerant circulating system, a detection part and a controller, the refrigerant circulation system comprises a first heat exchanger, a second heat exchanger, a third heat exchanger and a throttling component, and the first heat exchanger is sequentially connected with the second heat exchanger and the third heat exchanger through the throttling component to form a circulation loop; one of the second heat exchanger and the third heat exchanger exchanges heat with the photovoltaic module, and the second heat exchanger is provided with a first heat transfer promoting device; the detection component is used for outputting detection parameters; the controller is connected with the detection component and used for controlling the first heat transfer promoting device based on the detection parameters. Through the mode, the working temperature of the photovoltaic module can be reduced, so that the utilization rate of solar energy is improved, and flexible configuration of the heat exchange amount of each heat exchanger in the system can be realized.

Description

Technical Field

[0001] The present application relates to the field of thermal management technology, and in particular to a photovoltaic thermal system. Background Art

[0002] As the most accessible and widely distributed renewable energy, solar energy has attracted more and more attention. With the innovation of materials and technologies, the technology of using photovoltaic modules to generate electricity has gradually emerged. However, the operating temperature of photovoltaic modules increases and the power generation efficiency decreases, resulting in low solar energy utilization. The power generation efficiency of photovoltaic modules is generally around 20%, and the remaining 80% of the energy is dissipated in the environment in the form of waste heat, which will cause the operating temperature of photovoltaic modules to increase and waste resources. Summary of the invention

[0003] The main technical problem solved by the present application is to provide a photovoltaic thermal system that can reduce the operating temperature of photovoltaic components to improve the utilization rate of solar energy and realize flexible configuration of the heat exchange capacity of each heat exchanger in the system.

[0004] In order to solve the above technical problems, the present application provides a photovoltaic thermal system, which includes a photovoltaic component, a refrigerant circulation system, a detection component and a controller; the refrigerant circulation system includes a first heat exchanger, a second heat exchanger, a third heat exchanger and a throttling component, the first heat exchanger is connected to the second heat exchanger and the third heat exchanger in sequence through the throttling component to form a circulation loop; one of the second heat exchanger and the third heat exchanger exchanges heat with the photovoltaic component, and the second heat exchanger is provided with a first heat transfer promotion device; the detection component is used to output detection parameters; the controller is connected to the detection component, and is used to control the first heat transfer promotion device based on the detection parameters.

[0005] The detection parameter is at least partially used to characterize the light intensity, and the controller is used to control the first heat transfer promoting device based on the light intensity characterized by the detection parameter.

[0006] Among them, the detection component includes a temperature sensor, which is arranged between the first input end of one of the second heat exchanger and the third heat exchanger and the photovoltaic component. The temperature sensor is used to detect the temperature of the heat exchange medium flowing into the first input end, and the temperature is used to characterize the light intensity.

[0007] The detection component also includes a power generation detection component for detecting the power generation of the photovoltaic module, and the power generation is used to characterize the light intensity.

[0008] Among them, the detection component includes a temperature sensor and a power generation detection component for detecting the power generation of the photovoltaic component; the temperature sensor is arranged between the first input end of one of the second heat exchanger and the third heat exchanger and the photovoltaic component, and is used to detect the temperature of the heat exchange medium flowing into the first input end; the controller is used to calculate the light intensity based on the temperature and the power generation.

[0009] The controller is used to control the first heat transfer promoting device based on a target driving parameter, wherein the target driving parameter is determined by light intensity.

[0010] Wherein, the second heat exchanger comprises an air source heat exchanger using air as a heat source, the first heat transfer promoting device is a fan, and the target driving parameter is a target rotation speed of the fan.

[0011] The controller is used to control the first heat transfer promotion device so that the actual driving parameters of the first heat transfer promotion device approach the target driving parameters.

[0012] 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 the first heating mode in response to the light intensity being not less than the first light intensity threshold, wherein when the second heat exchanger is heat-exchanging with the photovoltaic component, the first heat transfer promotion device is activated, and when the third heat exchanger is heat-exchanging with the photovoltaic component, the first heat transfer promotion device is turned off; the controller is configured to switch to the second heating mode in response to the light intensity being less than the second light intensity threshold, wherein when the second heat exchanger is heat-exchanging with the photovoltaic component, the first heat transfer promotion device is turned off, and when the third heat exchanger is heat-exchanging with the photovoltaic component, the first heat transfer promotion device is activated; the controller is configured to switch to the 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 heat transfer promotion device is activated, and the thermal promotion efficiency of the first heat transfer promotion device in the third heating mode is between the thermal promotion efficiency in the first heating mode and the second heating mode; wherein the first light intensity threshold is greater than the second light intensity threshold.

[0013] Wherein, the third heat exchanger is provided with a second heat transfer promoting device.

[0014] Among them, in the first heating mode, when the second heat exchanger exchanges heat with the photovoltaic component, the second heat transfer promotion device is started, and when the third heat exchanger exchanges heat with the photovoltaic component, the second heat transfer promotion device is turned off; in the second heating mode, when the second heat exchanger exchanges heat with the photovoltaic component, the second heat transfer promotion device is turned off, and when the third heat exchanger exchanges heat with the photovoltaic component, the second heat transfer promotion device is started; in the third heating mode, both the first heat transfer promotion device and the second heat transfer promotion device are started.

[0015] 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.

[0016] The refrigerant circulation system further includes a compressor, and the first heat exchanger is connected to the third heat exchanger via the compressor, wherein the connection between the compressor and the first heat exchanger and the third heat exchanger is achieved by using a multi-way valve.

[0017] Among them, the photovoltaic thermal system also includes at least one of a heat storage device and an electric energy conversion circuit, the heat storage device is arranged between one of the second heat exchanger and the third heat exchanger and the photovoltaic component; the electric energy conversion circuit is electrically connected to the photovoltaic component and the controller, and is used to convert the electric energy output by the photovoltaic component into alternating current.

[0018] Wherein, the photovoltaic module also includes a collector; or, the third heat exchanger is a fluorine cold plate collector.

[0019] Among them, the second heat exchanger is an air source heat exchanger using air as a heat source.

[0020] Among them, the third heat exchanger is a medium source heat exchanger using a heat exchange medium as a heat source.

[0021] The throttling component is one of an expansion valve, a stop valve, and a capillary tube.

[0022] Wherein, when the second heat exchanger exchanges heat with the photovoltaic component, there are multiple third heat exchangers; wherein, multiple third heat exchangers are connected in series to form a series sequence, and the first heat exchanger is sequentially connected to the second heat exchanger and the series sequence through a throttling component; or, multiple third heat exchangers are connected in parallel to form a parallel sequence, and the first heat exchanger is sequentially connected to the second heat exchanger and the parallel sequence through a throttling component; when the third heat exchanger exchanges heat with the photovoltaic component, there are multiple second heat exchangers; wherein, multiple second heat exchangers are connected in series to form a series sequence, and the first heat exchanger is sequentially connected to the series sequence and the third heat exchanger through a throttling component; or, multiple second heat exchangers are connected in parallel to form a parallel sequence, and the first heat exchanger is sequentially connected to the parallel sequence and the third heat exchanger through a throttling component; or, there are multiple throttling components, each second heat exchanger and a throttling component form a heat exchange branch, and the first heat exchanger is connected to the third heat exchanger through each heat exchange branch respectively.

[0023] The beneficial effect of the present application is that, different from the prior art, one of the second heat exchanger and the third heat exchanger in the photovoltaic thermal system provided by the present application performs heat exchange with the photovoltaic module to utilize the heat generated by the photovoltaic module, which can reduce the temperature of the photovoltaic module and increase the power generation of the photovoltaic module, thereby improving the utilization rate of solar energy. Furthermore, by setting a detection component, according to the detection parameters of the detection component, the first heat transfer promotion device is controlled, and then the amount of heat source entering the second heat exchanger is controlled to control the heat exchange of the second heat exchanger. Since the first heat exchanger is connected to the second heat exchanger and the third heat exchanger in sequence through the throttling component, the heat exchange of the third heat exchanger can be further controlled according to the heat exchange of the second heat exchanger. In this way, the flexible distribution of the heat exchange of each heat exchanger can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1It is a structural schematic diagram of an implementation scheme of a photovoltaic thermal system provided by the present application;

[0025] Figure 2 It is a flow chart of an implementation method of a photovoltaic thermal system control method provided by the present application;

[0026] Figure 3 It is a schematic diagram of the framework structure of an embodiment of an electronic device provided by the present application;

[0027] Figure 4 It is a schematic diagram of the framework structure of an implementation scheme of a computer-readable storage medium provided in this application. DETAILED DESCRIPTION

[0028] The following is a clear and complete description of the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] It should be noted that in the embodiments of the present application, there are descriptions involving "first", "second", etc., which are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0030] In the description of the application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically limited. In the embodiment of the present application, all directional indications (such as up, down, left, right, front, back ...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their deformations are intended to cover non-exclusive inclusions. For example, the process, method, system, product or equipment comprising a series of steps or units is not limited to the steps or units listed, but optionally also includes the steps or units not listed, or optionally also includes other steps or units inherent to these processes, methods, products or equipment.

[0031] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] See also Figure 1 , Figure 1 It is a structural schematic diagram of an embodiment of a photovoltaic thermal system provided in this application.

[0033] In one embodiment, the photovoltaic thermal system 100 includes a photovoltaic module 1, a refrigerant circulation system 2, a detection component 3 and a controller 4. The photovoltaic module 1 can also be called a PVT module, and the photovoltaic module 1 can generate electricity using solar energy. Specifically, the photovoltaic module 1 may include a collector, which collects heat from the photovoltaic module 1, and a heat exchange medium can flow in the collector to absorb the heat of the photovoltaic module 1. The collector can be a flat plate heat exchanger, which is in contact with the back of a traditional photovoltaic panel through a certain processing method, and a heat exchange medium flows in the flat plate heat exchanger. The collector collects the heat generated by the photovoltaic panel through the flowing heat exchange medium. In a specific embodiment, the collector may include a water-cooled plate, which contains a pipeline, and the heat exchange medium can flow in the pipeline to absorb the heat of the photovoltaic panel.

[0034] The refrigerant circulation system 2 includes a first heat exchanger 21, a second heat exchanger 22, a third heat exchanger 23 and a throttling component 24. The first heat exchanger 21 is connected to the second heat exchanger 22 and the third heat exchanger 23 in sequence through the throttling component 24 to form a circulation loop; one of the second heat exchanger 22 and the third heat exchanger 23 exchanges heat with the photovoltaic component 1, and the second heat exchanger 22 is provided with a first heat transfer promoting device 25.

[0035] Among them, the heat exchanger that performs heat exchange with the photovoltaic component 1 can be a medium source heat exchanger with a heat exchange medium as a heat source, and the heat exchange medium can be at least one of water, liquid sodium, heat transfer liquid, ethylene glycol, etc. In a specific embodiment, the heat exchange medium is a mixture of water and ethylene glycol. The medium source heat exchanger can transfer the heat of the photovoltaic component 1 to the first heat exchanger 21. The heat exchanger that does not perform heat exchange with the photovoltaic component 1 transfers the heat of other heat sources to the first heat exchanger 21. Other heat sources may include air sources, water sources, ground sources, etc. In a specific embodiment, other heat sources may be air sources, and the heat exchanger that does not perform heat exchange with the photovoltaic component 1 is an air source heat exchanger. It can be understood that the photovoltaic thermal system 100 may include one or more heat exchangers that do not perform heat exchange with the photovoltaic component 1, and multiple heat exchangers may use the same or different heat sources. The throttling component may be one of an expansion valve, a stop valve, a throttle valve, and a capillary.

[0036] In one embodiment, the second heat exchanger 22 can perform heat exchange with the photovoltaic assembly 1, in which case the second heat exchanger 22 is a medium source heat exchanger, and the third heat exchanger 23 is an air source heat exchanger. The first heat transfer promotion device 25 can be a device capable of controlling the heat exchange amount of the medium source heat exchanger, for example, the first heat transfer promotion device 25 can be a pump, and the amount of the heat exchange medium can be controlled by the pump to control the heat exchange amount of the medium source heat exchanger.

[0037] In another embodiment, the third heat exchanger 23 may also perform heat exchange with the photovoltaic assembly 1, in which case the third heat exchanger 23 is a medium source heat exchanger and the second heat exchanger 22 is an air source heat exchanger. The first heat transfer promotion device 25 may be a device capable of controlling the heat exchange amount of the air source heat exchanger, for example, the first heat transfer promotion device 25 may be a fan, and the amount of air may be controlled by the fan to control the heat exchange amount of the medium source heat exchanger.

[0038] In one embodiment, the second heat exchanger 22 performs heat exchange with the photovoltaic module 1, and the heat exchanger that does not perform heat exchange with the photovoltaic module 1 is the third heat exchanger 23, and the number of the third heat exchangers 23 can be multiple. In a specific embodiment, multiple third heat exchangers 23 can be connected in series to form a series sequence, and the first heat exchanger 21 is connected to the second heat exchanger 22 and the series sequence in sequence through the throttling component 24. Specifically, the output end of the first heat exchanger 21 is connected to an input end of the second heat exchanger 22 through the throttling component 24, and an output end of the second heat exchanger 22 is connected to the input end of the third heat exchanger 23 located at one end of the series sequence, and the output end of the third heat exchanger 23 located at the other end of the series sequence is connected to the input end of the first heat exchanger 21.

[0039] In another specific embodiment, a plurality of third heat exchangers 23 may be connected in parallel to form a parallel sequence, and the first heat exchanger 21 is sequentially connected to the second heat exchanger 22 and the parallel sequence through a throttling component 24. Specifically, the output end of the first heat exchanger 21 is connected to an input end of the second heat exchanger 22 through the throttling component 24, and an output end of the second heat exchanger 22 is connected to the input end of each third heat exchanger 23 constituting the parallel sequence, and the input end of each third heat exchanger 23 is connected to the input end of the first heat exchanger 21.

[0040] In one embodiment, the third heat exchanger 23 performs heat exchange with the photovoltaic module 1, and the heat exchanger that does not perform heat exchange with the photovoltaic module 1 is the second heat exchanger 22, and the number of the second heat exchangers 22 can be multiple. In a specific embodiment, multiple second heat exchangers 22 are connected in series to form a series sequence, and the first heat exchanger is sequentially connected to the series sequence and the third heat exchanger 23 through a throttling component 24. Specifically, the output end of the first heat exchanger 21 is connected to the input end of the second heat exchanger 22 at one end of the series sequence through the throttling component 24, and the output end of the second heat exchanger 22 at the other end of the series sequence is connected to an input end of the third heat exchanger 23, and an output end of the third heat exchanger 23 is connected to the input end of the first heat exchanger 21.

[0041] In another specific embodiment, a plurality of second heat exchangers 22 are connected in parallel to form a parallel sequence, and the first heat exchanger 21 is sequentially connected to the parallel sequence and the third heat exchanger 23 through a throttling component 24. Specifically, the output end of the first heat exchanger 21 is connected to the input end of each second heat exchanger 22 constituting the parallel sequence through a throttling component 24, the output end of each second heat exchanger 22 is connected to an input end of the third heat exchanger 23, and an output end of the third heat exchanger 23 is connected to the input end of the first heat exchanger 21. In the above embodiments, the number of throttling components can be 1.

[0042] In other specific embodiments, there are multiple throttling components 24, each second heat exchanger 22 and a throttling component 24 form a heat exchange branch, and the first heat exchanger 21 is connected to the third heat exchanger 23 through each heat exchange branch. Specifically, the output end of the first heat exchanger 21 is connected to the input end of the second heat exchanger 22 of the same heat exchange path through each throttling component 24, the output end of the second heat exchanger 22 of the same heat exchange path is connected to an input end of the third heat exchanger 23, and an output end of the third heat exchanger 23 is connected to the input end of the first heat exchanger 21.

[0043] The detection component 3 is used to output detection parameters, and the detection parameters can characterize at least one of light intensity and heat. In one embodiment, some of the detection parameters can characterize light intensity. Correspondingly, the detection component 3 includes a light intensity detection component for detecting parameters characterizing light intensity, and the light intensity detection component includes but is not limited to a photometer, a light meter, a temperature sensor, a power generation detection component, etc. The power generation detection component includes but is not limited to a generator set test equipment, a generator test bench, a power generation tester, etc.

[0044] In a specific embodiment, the detection component 3 includes a temperature sensor, which can be arranged between the first input end of one of the second heat exchanger 22 and the third heat exchanger 23 and the photovoltaic module 1, and the temperature sensor is used to detect the temperature of the heat exchange medium flowing into the first input end, and the temperature is used to characterize the light intensity. In one embodiment, the second heat exchanger 22 performs heat exchange with the photovoltaic module 1, and the temperature sensor can be arranged between the first input end of the second heat exchanger 22 and the photovoltaic module 1, and is used to detect the temperature of the heat exchange medium flowing into the first input end of the second heat exchanger 22. In another embodiment, the third heat exchanger 23 performs heat exchange with the photovoltaic module 1, and the temperature sensor can be arranged between the first input end of the third heat exchanger 23 and the photovoltaic module 1, and is used to detect the temperature of the heat exchange medium flowing into the first input end of the third heat exchanger 23.

[0045] In another specific embodiment, the detection component 3 includes a power generation detection component for detecting the power generation of the photovoltaic component 1, and the power generation can be used to characterize the light intensity. The power generation detection component can be connected to the photovoltaic component 1 to determine the power generation of the photovoltaic component 1.

[0046] In other specific embodiments, the detection component 3 may include a temperature sensor and a power generation detection component. The controller 4 can calculate the light intensity through the temperature detected by the temperature sensor and the power generation detected by the power generation detection component. Specifically, a large amount of temperature, power generation and light intensity data can be used to fit the light intensity function. After the temperature and power generation are detected, the two are substituted into the light intensity function to obtain the light intensity. Among them, the light intensity function can be obtained by fitting N groups of data using a data fitting method. The data fitting method includes but is not limited to polynomial fitting, least squares method, interpolation method, curve fitting, non-parametric fitting and Bayesian fitting. Each group of data in the N groups of data includes a temperature, a power generation and a light intensity, and N is at least greater than 2.

[0047] The controller 4 is connected to the detection component 3 and is used to control the first heat transfer promoting device 25 based on the detection parameters. In one embodiment, the detection parameters are at least partially used to characterize the light intensity, and the controller 4 is specifically used to control the first heat transfer promoting device 25 based on the light intensity characterized by the detection parameters.

[0048] In a specific embodiment, the third heat exchanger 23 performs heat exchange with the photovoltaic assembly 1, and the controller 4 can determine the target driving parameter of the first heat transfer promotion device 25 based on the light intensity, and then control the first heat transfer promotion device 25 based on the target driving parameter, so that the actual driving parameter of the first heat transfer promotion device approaches the target driving parameter. The greater the light intensity, the smaller the target driving parameter.

[0049] Since the power generation efficiency of the photovoltaic module 1 decreases by 0.4% for every 1°C increase in the working temperature of the photovoltaic module 1; the power generation efficiency of the photovoltaic module 1 is generally about 20%, and the remaining 80% of the energy is dissipated in the environment in the form of waste heat, which will also cause the working temperature of the photovoltaic module 1 to increase and waste energy. In the above manner, one of the second heat exchanger and the third heat exchanger in the photovoltaic thermal system performs heat exchange with the photovoltaic module, which can utilize the heat generated by the photovoltaic module, reduce the temperature of the photovoltaic module, and increase the power generation of the photovoltaic module, thereby improving the utilization rate of solar energy. Further, by setting a detection component, according to the detection parameters of the detection component, the first heat transfer promotion device is controlled, and then the amount of heat source entering the second heat exchanger is controlled to control the heat exchange of the second heat exchanger. Since the first heat exchanger is connected to the second heat exchanger and the third heat exchanger in sequence through the throttling component, the heat exchange of the third heat exchanger can be further controlled according to the heat exchange of the second heat exchanger, so that the flexible allocation of the heat exchange of each heat exchanger can be achieved. In one embodiment, the heat exchange of the heat exchanger with better performance can be preferentially guaranteed to meet the requirements, thereby improving the performance of the photovoltaic thermal system.

[0050] In one embodiment, the third heat exchanger 23 is a medium source heat exchanger, and performs heat exchange with the photovoltaic module 1, the second heat exchanger 22 is an air source heat exchanger with air as a heat source, the first heat transfer promotion device 25 is a fan, the target driving parameter is the target speed of the fan, and the detection component 3 includes a temperature sensor. The controller 4 can obtain the target speed by looking up the speed table according to the temperature of the temperature sensor, and adjust the actual speed of the fan according to the target speed so that the actual speed approaches the target speed, and control the heat exchange of the air source heat exchanger by controlling the speed of the fan.

[0051] The tachometer may be obtained through testing and simulation, and the tachometer may represent the relationship between the target speed and the first temperature, or the tachometer may represent the relationship between the target speed and the first temperature and the heat load of the first heat exchanger.

[0052] In a specific embodiment, the speed table is shown in Table 1, which represents the relationship between the target speed and the first temperature and the heat load of the first heat exchanger. RPM1 to RPM5 represent different target speeds, Q1 to Q4 represent different heat loads of the first heat exchanger 21, t1 to t7 represent different temperatures, Q1 to Q4 and t1 to t7 increase in sequence, and the target speed decreases as the temperature increases. When the temperature is fixed, if the heat exchange of the medium source heat exchanger has not reached the optimum, the target speed decreases as the heat load increases; if the heat exchange of the medium source heat exchanger has reached the optimum, the heat load increases and the target speed can increase. It can be understood that each target speed in Table 1 represents the speed within a certain temperature range or a certain heat load range. As shown in Table 1, when the heat load is Q1, the temperature difference is t1, t2 or t3, the target speed is RPM1; similarly, when the temperature is t1, the heat load is Q1, Q2, Q3 or Q4, the target speed is RPM1.

[0053] Table 1 Tachometer

[0054]

[0055] In one embodiment, the photovoltaic thermal system 100 is provided with a first light intensity threshold and a second light intensity threshold. The photovoltaic thermal system 100 is configured to include three working modes. The detection parameters are at least partially used 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. In the first heating mode, when the second heat exchanger 22 is heat-exchanging with the photovoltaic component 1, the first heat transfer promoting device 25 is started, and when the third heat exchanger 23 is heat-exchanging with the photovoltaic component 1, the first heat transfer promoting device 25 is turned off.

[0056] The controller 4 is configured to switch to a second heating mode in response to the light intensity being less than a second light intensity threshold. In the second heating mode, when the second heat exchanger 22 is heat-exchanging with the photovoltaic component 1, the first heat transfer promoting device 25 is turned off, and when the third heat exchanger 23 is heat-exchanging with the photovoltaic component 1, the first heat transfer promoting device 25 is started.

[0057] The controller 4 is configured to switch to the third heating mode in response to the light intensity being between the first light intensity threshold and the second light intensity threshold. In the third heating mode, the first heat transfer promotion device 25 is started, and the heat promotion efficiency of the first heat transfer promotion device 25 in the third heating mode is between the heat promotion efficiencies in the first heating mode and the second heating mode. Taking the first heat transfer promotion device 25 as a fan as an example, the heat promotion efficiency is related to the rotation speed of the fan, and the greater the fan rotation speed, the greater the heat promotion efficiency; taking the first heat transfer promotion device 25 as a pump as an example, the heat promotion efficiency is related to the delivery rate of the pump, and the greater the delivery rate, the greater the heat promotion efficiency. Among them, the first light intensity threshold is greater than the second light intensity threshold.

[0058] Please continue reading Figure 1 In one embodiment, the third heat exchanger 23 is provided with a second heat transfer promotion device 26. In the first heating mode, when the second heat exchanger 22 is heat-exchanging with the photovoltaic component 1, the second heat transfer promotion device 26 is turned off, and when the third heat exchanger 23 is heat-exchanging with the photovoltaic component 1, the second heat transfer promotion device 26 is started; in the second heating mode, when the second heat exchanger 22 is heat-exchanging with the photovoltaic component 1, the second heat transfer promotion device 26 is started, and when the third heat exchanger 23 is heat-exchanging with the photovoltaic component 1, the second heat transfer promotion device 26 is turned off; in the third heating mode, both the first heat transfer promotion device 25 and the second heat transfer promotion device 26 are started.

[0059] It can be understood that after obtaining the detection parameters, the controller 4 can first determine the working mode of the photovoltaic thermal system 100 according to the light intensity represented by the detection parameters, and enter the corresponding working mode by adjusting the start and stop of the first heat transfer promotion device 25 and the second heat transfer promotion device 26. If the photovoltaic thermal system 100 is controlled to be in the third working mode, the first heat transfer promotion device 25 can be further controlled based on the light intensity represented by the detection parameters to control the heat exchange of the second heat exchanger 22 and the third heat exchanger 23. Please refer to the above description for the determination method of the light intensity, which will not be repeated here.

[0060] Among them, the first illumination intensity threshold and / or the second illumination intensity threshold can be set as needed. In one embodiment, the first illumination intensity threshold and / or the second illumination intensity threshold 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 illumination intensity and / or the second illumination intensity threshold. In a specific embodiment, as the heat load of the first heat exchanger 21 increases, both the first illumination intensity and the second illumination intensity threshold increase.

[0061] In a specific embodiment, considering that the working fluid flowing out of the first heat exchanger 21 will all become an overheated state after passing through the medium source heat exchanger first, and then there is basically no heat exchange after flowing into the air source heat exchanger, the system performance is poor, so the second heat exchanger 22 is set as an air source heat exchanger, and the third heat exchanger 23 is set in the medium source heat exchanger, and the third heat exchanger 23 exchanges heat with the photovoltaic component 1. The first heat transfer promotion device 25 is a fan, and the second heat transfer promotion device 26 is a pump. The pump can be set between the first output end of the third heat exchanger 23 and the photovoltaic component 1. In the first heating mode, the fan is turned off and the pump is started, mainly transferring the heat generated by the photovoltaic component 1 to the first heat exchanger 21. In the second heating mode, the fan is turned on and the pump is turned off, mainly transferring the heat in the air to the first heat exchanger 21. In the third heating mode, the fan and the pump are both turned on to transfer the heat generated by the photovoltaic component 1 and the heat in the air to the first heat exchanger 21.

[0062] Please continue reading Figure 1 In one embodiment, the refrigeration cycle system 2 also includes a compressor 27, and the first heat exchanger 21 is connected to the third heat exchanger 23 through the compressor 27, wherein the connection between the compressor 27 and the first heat exchanger 21 and the third heat exchanger 23 is achieved by using a multi-way valve 28.

[0063] Taking the heat exchange between the third heat exchanger 23 and the photovoltaic module 1 as an example, the second input end of the third heat exchanger 23 is connected to the output end of the second heat exchanger 22, and the second output end of the third heat exchanger 23 is connected to the compressor 27 through the multi-way valve 28. The multi-way valve 28 can be a two-way valve, a three-way valve or a four-way valve.

[0064] In a specific embodiment, the multi-way valve 28 is a four-way valve, the second output end of the third heat exchanger 23 is connected to the first port 281 of the multi-way valve 28, the first port 281 of the multi-way valve 28 is communicated with the second port 282 of the multi-way valve 28, the second port 282 of the multi-way valve 28 is connected to the air inlet of the compressor 27, and the working medium output through the second output end of the third heat exchanger 23 flows to the air inlet of the compressor 27 through the first port 281 of the multi-way valve 28 and the second port 282 of the multi-way valve 28. The third port 283 of the multi-way valve 28 is connected to the air outlet of the compressor 27, the third port 283 of the multi-way valve 28 is communicated with the fourth port 284, and the fourth port 284 is connected to the first heat exchanger 21; the working medium processed by the compressor 27 flows to the first heat exchanger 21 through the third port 283 and the fourth port 284 of the multi-way valve 28. The working medium may be a refrigerant.

[0065] Please continue reading Figure 1In one embodiment, the photovoltaic thermal system 100 may further include at least one of a heat storage device (not shown in the figure) and an electric energy conversion circuit 5. The heat storage device is arranged between one of the second heat exchanger 22 and the third heat exchanger 23 and the photovoltaic module 1. If the second heat exchanger 22 exchanges heat with the photovoltaic module 1, the heat storage device is arranged between the second heat exchanger 22 and the photovoltaic module 1; if the third heat exchanger 23 exchanges heat with the photovoltaic module 1, the heat storage device is arranged between the third heat exchanger 23 and the photovoltaic module 1. When the detection component is a temperature sensor, the heat storage device is arranged between the photovoltaic module 1 and the temperature sensor. The electric energy conversion circuit 5 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. The electric energy conversion circuit 5 may be an inverter. If the detection component 3 includes a power generation detection component, the power generation detection component may be connected to the electric energy conversion circuit 5 to measure the power generation.

[0066] In one embodiment, the photovoltaic thermal system 100 also includes a user-side pump body 7 and a user object 6, the first heat exchanger 21 is used to transfer the heat exchange of the second heat exchanger 22 and the third heat exchanger 23 to the user object 6, and the user-side pump body 7 is arranged between the first heat exchanger 21 and the user object 6, and is used to drive the flow of fluid between the first heat exchanger 21 and the user object 6.

[0067] In other embodiments, the third heat exchanger 23 in the above embodiment may also be a fluorine cold plate heat collector, which is used to collect heat from the photovoltaic module 1. In this case, there is no need to set up the third heat exchanger 23 and the heat collector. The flowing medium in the fluorine cold plate heat collector may be a refrigerant.

[0068] In a specific embodiment, Figure 1 As shown, the first output end of the first heat exchanger 21 is connected to one end of the throttling component 24, the other end of the throttling component 24 is connected to the input end of the second heat exchanger 22, the output end of the second heat exchanger 22 is connected to the second input end of the third heat exchanger 23, the second output end of the third heat exchanger 23 is connected to the air inlet of the compressor 27 via the multi-way valve 28, and the air outlet of the compressor 27 is connected to the first 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 to the photovoltaic module 1, the detection component is arranged between the first input end of the third heat exchanger 23 and the photovoltaic module 1, and the second heat transfer promotion device is 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 to the user object 6 to form a circulation loop, and the user-side pump body is arranged between the first heat exchanger 21 and the user object 6.

[0069] When the photovoltaic thermal system 100 is in the first heating mode, the liquid refrigerant flows out through the first output end of the first heat exchanger 21, becomes a two-phase state after passing through the throttling component 24, and flows into the second heat exchanger 22 through the input end of the second heat exchanger 22. The first heat transfer promotion device 25 does not operate, and the refrigerant can absorb a small amount of heat and still enter the third heat exchanger 23 in a two-phase state through the second input end of the third heat exchanger 23. The second heat transfer promotion device 26 operates, so that the heat of the photovoltaic module 1 is brought to the third heat exchanger 23 through the heat exchange medium and is combined with the system. The refrigerant exchanges heat. After absorbing the heat of the photovoltaic module 1 in the third heat exchanger 23, the refrigerant becomes gaseous, enters the four-way valve through the second output end of the third heat exchanger 23, and enters the air inlet of the compressor 27 through the first port and the second port of the four-way valve. The high-temperature and high-pressure refrigerant discharged from the air 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. After the high-temperature and high-pressure refrigerant transfers heat to water in the first heat exchanger 21, it becomes liquid and flows out from the first output end of the first heat exchanger 21. After the high-temperature and high-pressure refrigerant transfers heat to water in the first heat exchanger 21, the water that absorbs the heat is transferred to the user 6 through the user-side pump body 7. After the heat exchange medium absorbs the heat of the photovoltaic module 1, it 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.

[0070] When the photovoltaic thermal system 100 is in the second heating mode, the liquid refrigerant flows out through the first output end of the first heat exchanger 21, becomes a two-phase state after passing through the throttling component 24, and flows into the second heat exchanger 22 through the input end of the second heat exchanger 22. The first heat transfer promotion device 25 is running, and the refrigerant can absorb a large amount of heat in the air and become a saturated state or a gaseous state to enter the third heat exchanger 23. The second heat transfer promotion device 26 is not running, and the refrigerant can absorb a small amount of heat or no heat in the third heat exchanger 23. The saturated or gaseous refrigerant enters the four-way valve through the second output end of the third heat exchanger 23, and enters the air inlet of the compressor 27 through the first port and the second port of the four-way valve. The high-temperature and high-pressure refrigerant discharged from the air 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. After the high-temperature and high-pressure refrigerant transfers heat to water in the first heat exchanger 21, it becomes liquid and flows out from the first output end of the first heat exchanger 21.

[0071] When the photovoltaic thermal system 100 is in the third heating mode, the liquid refrigerant first enters the second heat exchanger 22, and the first heat transfer promotion device 25 is running. The refrigerant can absorb a large amount of heat in the air. At this time, the refrigerant cannot become saturated or gaseous. The refrigerant then enters the third heat exchanger 23, and the second heat transfer promotion device 26 is also running, so that the heat of the photovoltaic component 1 is brought to the third heat exchanger 23 through the heat exchange medium to exchange heat with the refrigerant. After the refrigerant absorbs the heat of the photovoltaic component 1 in the third heat exchanger 23, it becomes gaseous. The gaseous refrigerant is output through the second output end of the third heat exchanger 23 and enters the four-way valve, and enters the compressor 27 through the four-way valve for processing. The air outlet of the compressor 27 outputs high-temperature and high-pressure refrigerant. After the high-temperature and high-pressure refrigerant transfers heat to water in the first heat exchanger 21, it becomes liquid and flows out from the first output end of the first heat exchanger 21.

[0072] See also Figure 2 , Figure 2 1 is a flow chart of an embodiment of a control method for a photovoltaic thermal system provided by the present application, the method comprising:

[0073] S21: receiving detection parameters output by detection components in the photovoltaic thermal system.

[0074] S22: Control the first heat transfer promoting device based on the detected parameters.

[0075] The photovoltaic thermal system is a photovoltaic thermal system provided by any of the above embodiments. The detection parameter is at least partially used to characterize the light intensity. The target driving parameter can be determined based on the light intensity, and then the first heat transfer promotion device is controlled based on the target driving parameter so that the actual driving parameter of the first heat transfer promotion device approaches the target driving parameter.

[0076] This embodiment can be executed by a controller in a photovoltaic thermal system. For the specific process of each step in this embodiment, please refer to the specific process executed by the aforementioned controller, which will not be repeated here. It can be understood that this embodiment can also be executed by other devices.

[0077] See also Figure 3 , Figure 3 It is a schematic diagram of the framework structure of an embodiment of an electronic device provided in the present application.

[0078] The electronic device 30 includes a memory 31 and a processor 32. The memory 31 stores program instructions. The processor 32 is used to execute the program instructions stored in the memory 31 to implement the steps of any of the above-mentioned photovoltaic thermal system control method implementation methods. In a specific implementation scenario, the electronic device 30 may include but is not limited to: a microcomputer, a server, and in addition, the electronic device 30 may also include a mobile device such as a laptop computer and a tablet computer, which is not limited here. In a specific implementation, the electronic device 30 may include a controller in a photovoltaic thermal system.

[0079] Specifically, the processor 32 is used to control itself and the memory 31 to implement the steps of any of the above-mentioned method implementation methods. The processor 32 can also be called a CPU (Central Processing Unit). The processor 32 may be an integrated circuit chip with signal processing capabilities. The processor 32 can also be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field-programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. In addition, the processor 32 can be implemented by an integrated circuit chip.

[0080] See also Figure 4 , Figure 4 It is a schematic diagram of the framework structure of an implementation scheme of a computer-readable storage medium provided in this application.

[0081] The computer-readable storage medium 40 stores program instructions 41 , and when the program instructions 41 are executed by the processor, they are used to implement the steps of any of the above-mentioned photovoltaic thermal system control method implementation methods.

[0082] The computer-readable storage medium 40 may specifically be a medium that can store computer programs, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, or may be a server that stores the computer program. The server may send the stored computer program to other devices for execution, or may also execute the stored computer program itself.

[0083] If the technical solution of this application involves personal information, the product using the technical solution of this application has clearly informed the personal information processing rules and obtained the individual's voluntary consent before processing the personal information. If the technical solution of this application involves sensitive personal information, the product using the technical solution of this application has obtained the individual's separate consent before processing the sensitive personal information, and at the same time meets the "explicit consent" requirement. For example, on personal information collection devices such as cameras, clear and prominent signs are set to inform that the personal information collection scope has been entered and personal information will be collected. If the individual voluntarily enters the collection scope, it is deemed that he or she agrees to the collection of his or her personal information; or on the device that processes personal information, the personal information processing rules are notified by obvious signs / information, and the individual's authorization is obtained through pop-up information or by asking the individual to upload his or her personal information; among them, the personal information processing rules may include information such as the personal information processor, the purpose of personal information processing, the processing method, and the type of personal information processed.

[0084] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A photovoltaic thermal system, characterized in that: include: Photovoltaic panels; A refrigerant circulation system, the refrigerant circulation system comprising a first heat exchanger, a second heat exchanger, a third heat exchanger and a throttling component, the first heat exchanger is sequentially connected to the second heat exchanger and the third heat exchanger via the throttling component to form a circulation loop; one of the second heat exchanger and the third heat exchanger performs heat exchange with the photovoltaic assembly, and the second heat exchanger is provided with a first heat transfer promoting device; A detection component, used for outputting detection parameters; A controller is connected to the detection component and is used to control the first heat transfer promoting device based on the detection parameters.

2. The system according to claim 1, characterized in that The detection parameter is at least partially used to characterize light intensity, and the controller is used to control the first heat transfer facilitating device based on the light intensity characterized by the detection parameter.

3. The system according to claim 2, characterized in that The detection component includes a temperature sensor, which is arranged between the first input end of one of the second heat exchanger and the third heat exchanger and the photovoltaic component. The temperature sensor is used to detect the temperature of the heat exchange medium flowing into the first input end, and the temperature is used to characterize the light intensity.

4. The system according to claim 2, characterized in that The detection component comprises a power generation detection component for detecting the power generation of the photovoltaic assembly, and the power generation is used to characterize the light intensity.

5. The system according to claim 2, characterized in that The detection component includes a temperature sensor and a power generation detection component for detecting the power generation of the photovoltaic assembly; the temperature sensor is arranged between the first input end of one of the second heat exchanger and the third heat exchanger and the photovoltaic assembly, and is used to detect the temperature of the heat exchange medium flowing into the first input end; The controller is used to calculate the light intensity based on the temperature and the power generation.

6. The system according to claim 2, characterized in that The controller is configured to control the first heat transfer facilitating device based on a target driving parameter, wherein the target driving parameter is determined by the light intensity.

7. The system according to claim 6, characterized in that The second heat exchanger includes an air source heat exchanger using air as a heat source, the first heat transfer promotion device is a fan, and the target driving parameter is a target rotation speed of the fan.

8. The system according to claim 6, characterized in that The controller is used to control the first heat transfer facilitating device so that an actual driving parameter of the first heat transfer facilitating device approaches the target driving parameter.

9. The system according to claim 2, characterized in that 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 when the second heat exchanger is in heat exchange with the photovoltaic component, the first heat transfer promotion device is activated, and when the third heat exchanger is in heat exchange with the photovoltaic component, the first heat transfer promotion device is closed; 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 heat transfer facilitating device is turned off when the second heat exchanger is in heat exchange with the photovoltaic assembly, and the first heat transfer facilitating device is turned on when the third heat exchanger is in heat exchange with the photovoltaic assembly; The controller is configured to switch to a third heating mode in response to the illumination intensity being between the first illumination intensity threshold and the second illumination intensity threshold, wherein the first heat transfer facilitating device is activated and a heat facilitating efficiency of the first heat transfer facilitating device in the third heating mode is between heat facilitating efficiencies in the first heating mode and in the second heating mode; The first light intensity threshold is greater than the second light intensity threshold.

10. The system according to claim 9, characterized in that The third heat exchanger is provided with a second heat transfer promoting device; Wherein, in the first heating mode, when the second heat exchanger is heat-exchanging with the photovoltaic assembly, the second heat transfer promoting device is turned off, and when the third heat exchanger is heat-exchanging with the photovoltaic assembly, the second heat transfer promoting device is started; In the second heating mode, when the second heat exchanger is in heat exchange with the photovoltaic assembly, the second heat transfer facilitating device is activated, and when the third heat exchanger is in heat exchange with the photovoltaic assembly, the second heat transfer facilitating device is deactivated; In the third heating mode, both the first heat transfer facilitating device and the second heat transfer facilitating device are activated.

11. The system according to claim 9, characterized in that The controller is configured to adjust the first light intensity threshold and / or the second light intensity threshold based on a heat load of the first heat exchanger.

12. The system according to claim 1, characterized in that The refrigerant cycle system further includes a compressor, and the first heat exchanger is connected to the third heat exchanger via the compressor, wherein the connection between the compressor and the first heat exchanger and the third heat exchanger is achieved by using a multi-way valve.

13. The system according to claim 1, characterized in that The photovoltaic thermal system further comprises at least one of the following: a heat storage device, disposed between one of the second heat exchanger and the third heat exchanger and the photovoltaic assembly; An electric energy conversion circuit is electrically connected to the photovoltaic assembly and the controller, and is used for converting the electric energy output by the photovoltaic assembly into alternating current.

14. The system according to claim 1, characterized in that The photovoltaic assembly also includes a thermal collector; Alternatively, the third heat exchanger is a fluorine cold plate collector.

15. The system according to claim 1, characterized in that 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; And / or, the throttling component is one of an expansion valve, a stop valve, and a capillary tube.

16. The system according to claim 1, characterized in that When the second heat exchanger exchanges heat with the photovoltaic module, there are multiple third heat exchangers; wherein the multiple third heat exchangers are connected in series to form a series sequence, and the first heat exchanger is sequentially connected to the second heat exchanger and the series sequence through the throttling component; or, the multiple third heat exchangers are connected in parallel to form a parallel sequence, and the first heat exchanger is sequentially connected to the second heat exchanger and the parallel sequence through the throttling component; When the third heat exchanger performs heat exchange with the photovoltaic component, there are multiple second heat exchangers; wherein, the multiple second heat exchangers are connected in series to form a series sequence, and the first heat exchanger is sequentially connected to the series sequence and the third heat exchanger through the throttling component; or, the multiple second heat exchangers are connected in parallel to form a parallel sequence, and the first heat exchanger is sequentially connected to the parallel sequence and the third heat exchanger through the throttling component; or, there are multiple throttling components, each of the second heat exchangers and a throttling component form a heat exchange branch, and the first heat exchanger is respectively connected to the third heat exchanger through each of the heat exchange branches.

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