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, and a throttling component, the first heat exchanger being 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 exchanges heat with the photovoltaic module, and the second heat exchanger is provided with a first heat transfer enhancement device; the detection component is configured to output detection parameters; and the controller is connected to the measurement component, and is configured to control the first heat transfer enhancement device 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. 2024111345273, 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 can cause the working temperature of photovoltaic modules to rise and waste 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 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, and forms 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 to output a detection parameter. The controller is connected with the detection component and is used to control the first heat transfer promoting device 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 first heat transfer promoting device based on the light intensity represented by the detection parameter.

[0007] Among them, the detection component comprises a temperature sensor, 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 module, 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 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, and the power generation amount is used to represent the light intensity.

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

[0010] The controller is used for controlling the first heat transfer promoting device based on the target driving parameter, wherein the target driving parameter is determined by the light intensity.

[0011] The second heat exchanger includes an air source heat exchanger taking air as the heat source, and the first heat transfer promoting device is a fan, and the target driving parameter is the target rotating speed of the fan.

[0012] The controller is used for controlling the first heat transfer promoting device, so that the actual driving parameter of the first heat transfer promoting device approaches the target driving parameter.

[0013] The photovoltaic thermal system is provided with a first light intensity threshold value and a second light intensity threshold value, the controller is set to switch to the first heat supply mode in response to the light intensity being not less than the first light intensity threshold value, wherein the first heat transfer promoting device is started when the second heat exchanger exchanges heat with the photovoltaic module, and the first heat transfer promoting device is closed when the third heat exchanger exchanges heat with the photovoltaic module; the controller is set to switch to the second heat supply mode in response to the light intensity being less than the second light intensity threshold value, wherein the first heat transfer promoting device is closed when the second heat exchanger exchanges heat with the photovoltaic module, and the first heat transfer promoting device is started when the third heat exchanger exchanges heat with the photovoltaic module; the controller is set to switch to the third heat supply 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 heat transfer promoting device is started, and the heat promoting efficiency of the first heat transfer promoting device in the third heat supply mode is between the heat promoting efficiencies in the first heat supply mode and the second heat supply mode; wherein the first light intensity threshold value is greater than the second light intensity threshold value.

[0014] The third heat exchanger is provided with a second heat transfer promoting device.

[0015] In the first heat supply mode, the second heat transfer promoting device is started when the second heat exchanger exchanges heat with the photovoltaic module, and the second heat transfer promoting device is closed when the third heat exchanger exchanges heat with the photovoltaic module; in the second heat supply mode, the second heat transfer promoting device is closed when the second heat exchanger exchanges heat with the photovoltaic module, and the second heat transfer promoting device is started when the third heat exchanger exchanges heat with the photovoltaic module; in the third heat supply mode, the first heat transfer promoting device and the second heat transfer promoting device are both started.

[0016] 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.

[0017] The refrigerant circulation system further comprises a compressor, and the first heat exchanger is connected to the third heat exchanger through the compressor.

[0018] The photovoltaic light heat system further comprises 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 module, and the electric energy conversion circuit is electrically connected to the photovoltaic module and the controller and is used to convert electric energy output by the photovoltaic module into alternating current.

[0019] The photovoltaic module further comprises a heat collector, or the third heat exchanger is a fluorine cooling plate heat collector.

[0020] The second heat exchanger is an air source heat exchanger using air as a heat source.

[0021] The third heat exchanger is a medium source heat exchanger using a heat exchange medium as a heat source.

[0022] The throttling component is one of an expansion valve, a stop valve and a capillary tube.

[0023] When the second heat exchanger exchanges heat with the photovoltaic module, the third heat exchanger has a plurality of third heat exchangers; the plurality of third heat exchangers are connected in series with each other to form a series sequence, and the first heat exchanger is connected to the series sequence through the throttling component in sequence; or the plurality of third heat exchangers are connected in parallel with each other to form a parallel sequence, and the first heat exchanger is connected to the parallel sequence through the throttling component in sequence; when the third heat exchanger exchanges heat with the photovoltaic module, the second heat exchanger has a plurality of second heat exchangers; the plurality of second heat exchangers are connected in series with each other to form a series sequence, and the first heat exchanger is connected to the series sequence through the throttling component in sequence; or the plurality of second heat exchangers are connected in parallel with each other to form a parallel sequence, and the first heat exchanger is connected to the parallel sequence through the throttling component in sequence; or the throttling component has a plurality of 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.

[0024] The beneficial effects of the present application are: different from the prior art, one of the second heat exchanger and the third heat exchanger in the photovoltaic and photo-thermal 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 arranging the detection component, the amount of heat source entering the second heat exchanger is controlled according to the detection parameter of the detection component, so as to control the heat exchange amount of the second heat exchanger. Since the first heat exchanger is connected to the second heat exchanger and the third heat exchanger in turn through the throttling component, the heat exchange amount of the third heat exchanger can be further controlled according to the heat exchange amount of the second heat exchanger. In this way, the flexible distribution of the heat exchange amount of each heat exchanger can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is a structural schematic diagram of an embodiment of the photovoltaic and photo-thermal system provided by the present application;

[0026] Fig. 2 is a flow schematic diagram of an embodiment of the control method of the photovoltaic and photo-thermal system provided by the present application;

[0027] Fig. 3 is a schematic diagram of the framework structure of an embodiment of the electronic device provided by the present application;

[0028] Fig. 4 is a schematic diagram of the framework structure of an embodiment of the computer readable storage medium provided by the present application. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to 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.

[0030] It should be noted that the description of "first", "second" and the like in the embodiments of the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first", "second" can explicitly or implicitly include at least one of the features.

[0031] In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly and specifically limited. All directional references, such as up, down, left, right, front, back, etc., used in the application embodiments described herein are in relation to the specific embodiment as shown in the figures and are used to describe the relative location relationship, movement condition, etc. between the components, and if the specific posture changes, the directional references will also change accordingly. In addition, the terms "comprising" and "having" 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 that are not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0032] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The occurrence of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments 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.

[0033] Please refer to FIG. 1, which is a structural schematic diagram of an embodiment of a photovoltaic-photothermal system provided by the application.

[0034] 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 heat on the photovoltaic assembly 1 can be collected by the heat collector, and a heat exchange medium can flow in the heat collector to absorb the heat of 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, and the flat plate heat exchanger has a heat exchange medium flowing therein. The heat collector collects the heat generated by the photovoltaic panel through the flowing heat exchange medium. In a specific embodiment, the heat collector can include a water cooling plate, and the water cooling plate contains a pipeline, and the heat exchange medium can flow in the pipeline to absorb the heat of the photovoltaic panel.

[0035] 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, and forms a circulation loop; one of the second heat exchanger 22 and the third heat exchanger 23 exchanges heat with the photovoltaic assembly 1, and the second heat exchanger 22 is provided with a first heat transfer promoting device 25.

[0036] The heat exchanger in heat exchange with the photovoltaic module 1 can be a medium source heat exchanger taking a heat medium as a heat source. The heat medium can be at least one of water, liquid sodium, heat-conducting liquid, ethylene glycol, etc. In a specific embodiment, the heat medium is a mixture of water and ethylene glycol. The medium source heat exchanger can transfer the heat of the photovoltaic module 1 to the first heat exchanger 21. The heat exchanger not in heat exchange with the photovoltaic module 1 is a heat exchanger transferring the heat of other heat sources to the first heat exchanger 21. The other heat sources can include air source, water source, ground source, etc. In a specific embodiment, the other heat sources can be air source, and the heat exchanger not in heat exchange with the photovoltaic module 1 is an air source heat exchanger. It can be understood that the photovoltaic and thermal system 100 can include one or more heat exchangers not in heat exchange with the photovoltaic module 1, and the multiple heat exchangers can take the same or different heat sources. The throttling component can be one of an expansion valve, a stop valve, a throttle valve, and a capillary tube.

[0037] In an embodiment, the second heat exchanger 22 can be in heat exchange with the photovoltaic module 1, and in this 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 promoting 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 promoting device 25 can be a pump, and the amount of heat medium is controlled by the pump to control the heat exchange amount of the medium source heat exchanger.

[0038] In another embodiment, the third heat exchanger 23 can also be in heat exchange with the photovoltaic module 1, and in this 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 promoting device 25 can be a device capable of controlling the heat exchange amount of the air source heat exchanger, for example, the first heat transfer promoting device 25 can be a fan, and the amount of air is controlled by the fan to control the heat exchange amount of the medium source heat exchanger.

[0039] In an embodiment, the second heat exchanger 22 is in heat exchange with the photovoltaic module 1, and in this case, the heat exchanger not in heat exchange with the photovoltaic module 1 is the third heat exchanger 23, and the number of the third heat exchanger 23 can be multiple. In a specific embodiment, the 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 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, an output end of the second heat exchanger 22 is connected to an input end of the third heat exchanger 23 at one end of the series sequence, and an output end of the third heat exchanger 23 at the other end of the series sequence is connected to an input end of the first heat exchanger 21.

[0040] In another embodiment, the plurality of third heat exchangers 23 are connected in parallel to form a parallel sequence, and the first heat exchanger 21 is connected to the parallel sequence and the third heat exchanger 23 in turn through the 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 parallel sequence through the throttling component 24, the output end of the second heat exchanger 22 at the other end of the parallel sequence is connected to the input end of the third heat exchanger 23, and the output end of the third heat exchanger 23 is connected to the input end of the first heat exchanger 21.

[0041] In an embodiment, the third heat exchanger 23 exchanges heat with the photovoltaic module 1, and the second heat exchanger 22 that does not exchange heat with the photovoltaic module 1 is provided in multiple numbers. In a specific embodiment, the plurality of second heat exchangers 22 are connected in series to form a series sequence, and the first heat exchanger is connected to the series sequence and the third heat exchanger 23 in turn through the 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, the output end of the second heat exchanger 22 at the other end of the series sequence is connected to the input end of the third heat exchanger 23, and the output end of the third heat exchanger 23 is connected to the input end of the first heat exchanger 21.

[0042] In another embodiment, the plurality of second heat exchangers 22 are connected in parallel to form a parallel sequence, and the first heat exchanger 21 is connected to the parallel sequence and the third heat exchanger 23 in turn through the 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 in the parallel sequence through the throttling component 24, the output end of each second heat exchanger 22 is connected to the input end of the third heat exchanger 23, and the 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 one.

[0043] In other embodiments, the throttling component 24 has multiple numbers, 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 in the same heat exchange branch through the throttling component 24, the output end of the second heat exchanger 22 in the same heat exchange branch is connected to the input end of the third heat exchanger 23, and the output end of the third heat exchanger 23 is connected to the input end of the first heat exchanger 21.

[0044] The detecting component 3 is configured to output a detecting parameter, which can represent at least one of the light intensity and the heat. In an embodiment, part of the detecting parameters can represent the light intensity. Correspondingly, the detecting component 3 comprises a light intensity detecting component configured to detect a parameter representing the light intensity, which can include but is not limited to a light meter, a light detector, a temperature sensor, a power generation detecting component, and the like, and the power generation detecting component can include but is not limited to a generator set testing device, a generator testing bench, a power generation tester, and the like.

[0045] In an embodiment, the detecting component 3 comprises 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 is configured to detect the temperature of the heat exchange medium flowing into the first input end, which can represent the light intensity. In an embodiment, the second heat exchanger 22 exchanges heat 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 configured 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 exchanges heat 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 configured to detect the temperature of the heat exchange medium flowing into the first input end of the third heat exchanger 23.

[0046] In another embodiment, the detecting component 3 comprises a power generation detecting component configured to detect the power generation of the photovoltaic module 1, which can represent the light intensity. The power generation detecting component can be connected to the photovoltaic module 1 to determine the power generation of the photovoltaic module 1.

[0047] In other embodiments, the detecting component 3 can comprise a temperature sensor and a power generation detecting component. The controller 4 can calculate the light intensity based on the temperature detected by the temperature sensor and the power generation detected by the power generation detecting component. Specifically, a light intensity function can be fitted by a large number of temperature, power generation, and light intensity data, and then the temperature and the power generation are substituted into the light intensity function to obtain the light intensity after the temperature and the power generation are detected. The light intensity function can be fitted by N sets of data by a data fitting method, which can include but is not limited to a polynomial fitting, a least square method, an interpolation method, a curve fitting, a non-parametric fitting, and a Bayesian fitting. Each set of data in the N sets of data comprises a temperature, a power generation, and a light intensity, and N is at least greater than 2.

[0048] The controller 4 is connected to the detecting component 3 and is configured to control the first heat transfer promoting device 25 based on the detecting parameter. In an embodiment, the detecting parameter at least partially represents the light intensity, and the controller 4 is specifically configured to control the first heat transfer promoting device 25 based on the light intensity represented by the detecting parameter.

[0049] In one embodiment, the third heat exchanger 23 exchanges heat with the photovoltaic module 1, and the controller 4 can determine a target driving parameter of the first heat transfer promoting device 25 based on the light intensity, and control the first heat transfer promoting device 25 based on the target driving parameter, so that the actual driving parameter of the first heat transfer promoting device approaches the target driving parameter. Wherein, the greater the light intensity, the smaller the target driving parameter.

[0050] Since the photovoltaic module 1 generates 0.4% less power for every 1℃ increase in operating temperature, and the photovoltaic module 1 generally generates about 20% of the 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 rise and wastes energy. In the above manner, one of the second heat exchanger and the third heat exchanger in the photovoltaic-thermal system exchanges heat with the photovoltaic module, which can utilize the heat generated by the photovoltaic module, reduce the temperature of the photovoltaic module, increase the power generation of the photovoltaic module, and thus improve the utilization rate of solar energy. Further, by providing a detection component, the amount of heat source entering the second heat exchanger is controlled by controlling the first heat transfer promoting device according to the detection parameter of the detection component, so as to control the heat exchange amount 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 amount of the third heat exchanger can be further controlled according to the heat exchange amount of the second heat exchanger, so that the heat exchange amounts of the heat exchangers can be flexibly distributed. In one embodiment, the heat exchange amount of the heat exchanger with better performance can be preferentially guaranteed to meet the requirements, so that the performance of the photovoltaic-thermal system can be improved.

[0051] In one embodiment, the third heat exchanger 23 is a medium source heat exchanger and exchanges heat with the photovoltaic module 1, the second heat exchanger 22 is an air source heat exchanger with air as the heat source, the first heat transfer promoting device 25 is a fan, the target driving parameter is the target rotating speed of the fan, and the detection component 3 includes a temperature sensor. The controller 4 can obtain the target rotating speed from a rotating speed table according to the temperature of the temperature sensor, and adjust the actual rotating speed of the fan according to the target rotating speed, so that the actual rotating speed approaches the target rotating speed, and the heat exchange amount of the air source heat exchanger is controlled by controlling the rotating speed of the fan.

[0052] Wherein, the rotating speed table can be obtained by testing and simulation, and the rotating speed table can represent the relationship between the target rotating speed and the first temperature, or the rotating speed table can represent the relationship between the target rotating speed and the first temperature and the heat load of the first heat exchanger.

[0053] In a specific embodiment, the speed table is shown in Table 1, which represents the relationship between the target speed and the first temperature, 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, t1 to t7 are sequentially increased, and the target speed decreases as the temperature increases. When the temperature is fixed, if the heat exchange capacity of the medium source heat exchanger does not reach the optimum, the target speed decreases as the heat load increases; if the heat exchange capacity 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 within a certain heat load range. As shown in Table 1, when the heat load is Q1, the temperature difference is t1, t2 or t3, and the target speed is RPM1. Similarly, when the temperature is t1, the heat load is Q1, Q2, Q3 or Q4, and the target speed is RPM1.

[0054] Table 1: Speed table

[0055] In an embodiment, the photovoltaic photo-thermal system 100 is provided with a first light intensity threshold and a second light intensity threshold, and the photovoltaic photo-thermal system 100 is configured to include three working modes. The detection parameter is at least partially used to represent the light intensity, and 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, the first heat transfer promoting device 25 is started when the second heat exchanger 22 exchanges heat with the photovoltaic module 1, and the first heat transfer promoting device 25 is closed when the third heat exchanger 23 exchanges heat with the photovoltaic module 1.

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

[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 promoting device 25 is started, and the heat promoting efficiency of the first heat transfer promoting device 25 in the third heating mode is between the heat promoting efficiency in the first heating mode and the heat promoting efficiency in the second heating mode. Taking the fan as an example, the heat promoting efficiency is related to the speed of the fan, and the greater the speed of the fan, the greater the heat promoting efficiency. Taking the pump as an example, the heat promoting efficiency is related to the delivery rate of the pump, and the greater the delivery rate, the greater the heat promoting efficiency. The first light intensity threshold is greater than the second light intensity threshold.

[0058] Please continue to refer to FIG. 1, in an embodiment, the third heat exchanger 23 is provided with a second heat transfer promoting device 26, in the first heat supply mode, when the second heat exchanger 22 exchanges heat with the photovoltaic module 1, the second heat transfer promoting device 26 is closed, when the third heat exchanger 23 exchanges heat with the photovoltaic module 1, the second heat transfer promoting device 26 is started; in the second heat supply mode, when the second heat exchanger 22 exchanges heat with the photovoltaic module 1, the second heat transfer promoting device 26 is started, when the third heat exchanger 23 exchanges heat with the photovoltaic module 1, the second heat transfer promoting device 26 is closed; in the third heat supply mode, the first heat transfer promoting device 25 and the second heat transfer promoting device 26 are both started.

[0059] It can be understood that after obtaining the detection parameter, the controller 4 can first determine the working mode of the photovoltaic thermal system 100 according to the light intensity represented by the detection parameter, and enter the corresponding working mode by adjusting the starting and closing of the first heat transfer promoting device 25 and the second heat transfer promoting device 26. If the photovoltaic thermal system 100 is controlled to be in the third working mode, the first heat transfer promoting device 25 can be further controlled based on the light intensity represented by the detection parameter to control the heat exchange amount of the second heat exchanger 22 and the third heat exchanger 23. The determination method of the light intensity is described above and will not be repeated here.

[0060] The first light intensity threshold and / or the second light intensity threshold can be set as needed, in an embodiment, the first light intensity threshold and / or the second light 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 light intensity threshold and / or the second light intensity threshold. In a specific embodiment, when the heat load of the first heat exchanger 21 increases, the first light intensity threshold and the second light intensity threshold both increase.

[0061] In a specific embodiment, considering that the working medium flowing out of the first heat exchanger 21 will all become superheated after exchanging heat with the medium source heat exchanger, and then there is basically no heat exchange amount 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 module 1. The first heat transfer promoting device 25 is a fan, and the second heat transfer promoting device 26 is a pump. The pump can be arranged between the first output end of the third heat exchanger 23 and the photovoltaic module 1. In the first heat supply mode, the fan is closed and the pump is started, mainly transferring the heat generated by the photovoltaic module 1 to the first heat exchanger 21. In the second heat supply mode, the fan is opened and the pump is closed, mainly transferring the heat in the air to the first heat exchanger 21. In the third heat supply mode, the fan and the pump are both opened, transferring the heat generated by the photovoltaic module 1 and the heat in the air to the first heat exchanger 21.

[0062] Please continue to refer to FIG. 1, in an embodiment, the refrigerant circulation system 2 further comprises a compressor 27, the first heat exchanger 21 is connected with 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 realized 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 with the output end of the second heat exchanger 22, and the second output end of the third heat exchanger 23 is connected with 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 with the first port 281 of the multi-way valve 28, the first port 281 of the multi-way valve 28 and the second port 282 of the multi-way valve 28 are in communication, the second port 282 of the multi-way valve 28 and the gas inlet of the compressor 27 are connected, and the working medium output through the second output end of the third heat exchanger 23 flows to the gas 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 and the gas outlet of the compressor 27 are connected, the third port 283 of the multi-way valve 28 and the fourth port 284 of the multi-way valve 28 are in communication, and the fourth port 284 is connected with 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 of the multi-way valve 28 and the fourth port 284 of the multi-way valve 28. Wherein, the working medium can be a refrigerant.

[0065] Please continue to refer to FIG. 1, in an embodiment, the photovoltaic-thermal system 100 can further comprise 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 with the photovoltaic module 1 and the controller 4, and is used for converting the electric energy output by the photovoltaic module 1 into alternating current, and the electric energy conversion circuit 5 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 with the electric energy conversion circuit 5 to measure the power generation amount.

[0066] In an embodiment, the photovoltaic photo-thermal system 100 further comprises a usage-side pump 7 and a usage object 6, the first heat exchanger 21 is used to transfer the heat exchange amount of the second heat exchanger 22 and the third heat exchanger 23 to the usage object 6, the usage-side pump 7 is arranged between the first heat exchanger 21 and the usage object 6, and is used to drive the flow of fluid between the first heat exchanger 21 and the usage object 6.

[0067] In other embodiments, the third heat exchanger 23 in the above-mentioned embodiments can also be a fluorine cold plate collector, which is used to collect the 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.

[0068] In a specific embodiment, as shown in FIG. 1, the first output end of the first heat exchanger 21 is connected with one end of the throttling component 24, the other end of the throttling component 24 is connected with the input end of the second heat exchanger 22, the output end of the second heat exchanger 22 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 gas inlet of the compressor 27 through the multi-way valve 28, the gas outlet of the compressor 27 is connected with 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 with 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 promoting 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 with the usage object 6, and form a circulation loop, and the usage-side pump is arranged between the first heat exchanger 21 and the usage object 6.

[0069] When the photovoltaic-thermal system 100 is in the first heat supply mode, the liquid refrigerant flows out through the first output end of the first heat exchanger 21, becomes two-phase state after passing through the throttling component 24, flows into the second heat exchanger 22 through the input end of the second heat exchanger 22, the first heat transfer promoting device 25 does not operate, the refrigerant can absorb a small amount of heat, still in two-phase state enters the third heat exchanger 23 through the second input end of the third heat exchanger 23, the second heat transfer promoting device 26 operates, so that the heat of the photovoltaic module 1 is brought into the third heat exchanger 23 through the heat exchange medium to exchange heat with the refrigerant, the refrigerant becomes gaseous state after absorbing the heat of the photovoltaic module 1 in the third heat exchanger 23, enters the four-way valve through the second output end of the third heat exchanger 23, enters the gas 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 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, becomes liquid state after the high-temperature and high-pressure refrigerant in the first heat exchanger 21 transfers heat to the water, and flows out from the first output end of the first heat exchanger 21. The water absorbing heat after the high-temperature and high-pressure refrigerant in the first heat exchanger 21 transfers heat to the water is transferred to the user 6 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 again 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 heat supply mode, the liquid refrigerant flows out through the first output end of the first heat exchanger 21, becomes two-phase state after passing through the throttling component 24, flows into the second heat exchanger 22 through the input end of the second heat exchanger 22, the first heat transfer promoting device 25 operates, the refrigerant can absorb a large amount of heat in the air, becomes saturated state or gaseous state and enters the third heat exchanger 23, the second heat transfer promoting device 26 does not operate, the refrigerant can absorb a small amount of heat or no heat in the third heat exchanger 23, the refrigerant in saturated state or gaseous state enters the four-way valve through the second output end of the third heat exchanger 23, enters the gas 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 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, becomes liquid state after the high-temperature and high-pressure refrigerant in the first heat exchanger 21 transfers heat to the water, and flows out from the first output end of the first heat exchanger 21.

[0071] When the photovoltaic and photo-thermal system 100 is in the third heat supply mode, the liquid refrigerant first enters the second heat exchanger 22, the first heat transfer promoting device 25 operates, and 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 promoting device 26 also operates, so that the heat of the photovoltaic module 1 is brought to the third heat exchanger 23 through the heat exchange medium to exchange heat with the refrigerant. The refrigerant becomes gaseous after absorbing the heat of the photovoltaic module 1 in the third heat exchanger 23, and the gaseous refrigerant is output through the second output end of the third heat exchanger 23 and enters the four-way valve. The high-temperature and high-pressure refrigerant is output from the outlet of the compressor 27, and the high-temperature and high-pressure refrigerant becomes liquid 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.

[0072] Please refer to FIG. 2, which is a flowchart of an embodiment of the control method of the photovoltaic and photo-thermal system provided in the present application. The method comprises:

[0073] S21: receiving a detection parameter output by a detection component in the photovoltaic and photo-thermal system.

[0074] S22: controlling the first heat transfer promoting device based on the detection parameter.

[0075] In the embodiment, the photovoltaic and photo-thermal system is any of the photovoltaic and photo-thermal systems provided in the foregoing embodiments. The detection parameter at least partially represents the light intensity. The target driving parameter can be determined based on the light intensity, and the first heat transfer promoting device is controlled based on the target driving parameter, so that the actual driving parameter of the first heat transfer promoting device approaches the target driving parameter.

[0076] The embodiment can be executed by a controller in the photovoltaic and photo-thermal system. For the specific process of each step in the embodiment, please refer to the specific process executed by the controller described above, which will not be repeated here. It can be understood that the embodiment can also be executed by another device.

[0077] Please refer to FIG. 3, which is a schematic diagram of the framework structure of an embodiment of the electronic device provided in the present application.

[0078] The electronic device 30 comprises a memory 31 and a processor 32. The memory 31 stores program instructions, and the processor 32 is configured to execute the program instructions stored in the memory 31 to implement the steps of any of the control method embodiments of the photovoltaic and photo-thermal system described above. In a specific implementation scenario, the electronic device 30 can include but is not limited to a microcomputer, a server, and in addition, the electronic device 30 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 30 can include a controller in the photovoltaic and photo-thermal system.

[0079] Specifically, the processor 32 is configured to control itself and the memory 31 to implement the steps of any of the above-mentioned method embodiments. The processor 32 can also be referred to as a CPU (Central Processing Unit). The processor 32 can be an integrated circuit chip having a processing capability of signals. The processor 32 can also be a general processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component. The general processor can be a microprocessor or the processor can also be any conventional processor or the like. In addition, the processor 32 can be jointly implemented by integrated circuit chips.

[0080] Referring to FIG. 4, FIG. 4 is a schematic diagram of a framework structure of an embodiment of the computer readable storage medium provided in the present application.

[0081] The computer readable storage medium 40 stores program instructions 41, which, when executed by a processor, are configured to implement the steps of any of the above-mentioned control method embodiments of the photovoltaic and photo-thermal system.

[0082] The computer readable storage medium 40 can specifically be a U disk, a mobile hard disk, a ROM (Read-Only Memory), a RAM (Random Access Memory), a magnetic disk or an optical disk or the like medium capable of storing a computer program, or can also be a server storing the computer program, which can send the stored computer program to other devices for running or can also run the stored computer program by itself.

[0083] If the technical solutions of the present application involve personal information, the product applying the technical solutions 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 solutions of the present application involve sensitive personal information, the product applying the technical solutions 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 it has entered the personal information collection range and will collect personal information. If the individual voluntarily enters the collection range, it is considered to agree to collect 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 his / her personal information. The personal information processing rules can include personal information processor, personal information processing purpose, processing method and personal information type, etc.

[0084] 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, is 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 system, comprising: a photovoltaic module; a 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 connected to the second heat exchanger and the third heat exchanger in sequence through the throttling component, and forms 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; a detection component for outputting a detection parameter; a controller connected to the detection component, for controlling the first heat transfer promoting device based on the detection parameter.

2. The system of claim 1, wherein, The detection parameter is used at least partially to represent the light intensity, and the controller is used to control the first heat transfer promoting device based on the light intensity represented by the detection parameter.

3. The system of claim 2, wherein, The detection component comprises a temperature sensor arranged between a first input end of one of the second heat exchanger and the third heat exchanger and the photovoltaic module, and the temperature sensor is used to detect the temperature of heat exchange medium flowing into the first input end, and the temperature is used to represent the light intensity.

4. The system of claim 2, wherein, The detection component comprises a power generation detection component for detecting the power generation of the photovoltaic module, and the power generation is used to represent the light intensity.

5. The system of claim 2, wherein, The detection component comprises a temperature sensor and a power generation detection component for detecting the power generation of the photovoltaic module; the temperature sensor is arranged between a first input end of one of the second heat exchanger and the third heat exchanger and the photovoltaic module, and is used to detect the temperature of 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 of claim 2, wherein, 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 the light intensity.

7. The system of claim 6, wherein, The second heat exchanger comprises an air source heat exchanger taking air as a heat source, the first heat transfer promoting device is a fan, and the target driving parameter is a target rotating speed of the fan.

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

9. The system of claim 2, wherein, The photovoltaic thermal system is provided with a first light intensity threshold value and a second light intensity threshold value, and the controller is arranged to switch to a first heat supply mode in response to the light intensity being not less than the first light intensity threshold value, wherein the first heat transfer promoting device is started when the second heat exchanger exchanges heat with the photovoltaic module, and the first heat transfer promoting device is closed when the third heat exchanger exchanges heat with the photovoltaic module; The controller is arranged to switch to a second heat supply mode in response to the light intensity being less than the second light intensity threshold value, wherein the first heat transfer promoting device is closed when the second heat exchanger exchanges heat with the photovoltaic module, and the first heat transfer promoting device is started when the third heat exchanger exchanges heat with the photovoltaic module. The controller is configured to switch to a third heat supply 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 promoting device is activated, and a heat promoting efficiency of the first heat transfer promoting device in the third heat supply mode is between heat promoting efficiencies in the first heat supply mode and the second heat supply mode. The first illumination intensity threshold is greater than the second illumination intensity threshold.

10. The system of claim 9, wherein, The third heat exchanger is provided with a second heat transfer promoting device. In the first heat supply mode, the second heat transfer promoting device is closed when the second heat exchanger exchanges heat with the photovoltaic module, and the second heat transfer promoting device is activated when the third heat exchanger exchanges heat with the photovoltaic module. In the second heat supply mode, the second heat transfer promoting device is activated when the second heat exchanger exchanges heat with the photovoltaic module, and the second heat transfer promoting device is closed when the third heat exchanger exchanges heat with the photovoltaic module. In the third heat supply mode, the first heat transfer promoting device and the second heat transfer promoting device are both activated.

11. The system of claim 9, wherein, The controller is configured to adjust the first illumination intensity threshold and / or the second illumination intensity threshold based on a heat load of the first heat exchanger.

12. The system of claim 1, wherein, The refrigerant circulation system further comprises a compressor, and the first heat exchanger is connected to the third heat exchanger through 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 of claim 1, wherein, The photovoltaic and photo-thermal system further comprises at least one of: A heat storage device arranged between one of the second heat exchanger and the third heat exchanger and the photovoltaic module; An electric energy conversion circuit electrically connected to the photovoltaic module and the controller, and configured to convert electric energy output by the photovoltaic module into alternating current.

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

15. The system of claim 1, wherein, The second heat exchanger is an air source heat exchanger using air as a heat source. The third heat exchanger is a medium source heat exchanger using a heat exchange medium as a heat source. The throttling component is one of an expansion valve, a stop valve, and a capillary tube.

16. The system of claim 1, wherein, When the second heat exchanger exchanges heat with the photovoltaic module, the third heat exchanger has a plurality of third heat exchangers; wherein the plurality of third heat exchangers are connected in series with each other to form a series sequence, and the first heat exchanger is connected to the second heat exchanger and the series sequence in sequence through the throttling component; or the plurality of third heat exchangers are connected in parallel with each other to form a parallel sequence, and the first heat exchanger is connected to the second heat exchanger and the parallel sequence in sequence through the throttling component. When the third heat exchanger exchanges heat with the photovoltaic module, the second heat exchanger has multiple; wherein multiple second heat exchangers are connected in series with each other to form a series sequence, and the first heat exchanger is connected to the series sequence and the third heat exchanger in turn through the throttling component; or multiple second heat exchangers are connected in parallel with each other to form a parallel sequence, and the first heat exchanger is connected to the parallel sequence and the third heat exchanger in turn through the throttling component; or the throttling component has multiple, and 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.

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