Irradiance detection method and device, pvt heat pump system and storage medium

Abstract

The present disclosure provides a kind of irradiance detection method and device, PVT heat pump system and storage medium.The irradiance detection method includes: in the case where photovoltaic photothermal PVT component accesses heat pump system, the flow rate of heat transfer working medium, the first heat transfer working medium temperature at the outlet of PVT component, the second heat transfer working medium temperature at the inlet of PVT component, the surface temperature of PVT component and ambient temperature are obtained;According to the flow rate of heat transfer working medium, the first heat transfer working medium temperature, the second heat transfer working medium temperature, the surface temperature and ambient temperature, determine the first irradiance.

Description

Technical Field

[0001] This disclosure relates to the field of photovoltaic thermal (PVT) heat pump systems, and particularly to an irradiance detection method and apparatus, a PVT heat pump system, and a storage medium. Background Technology

[0002] In solar heat pump systems, PVT module-heat pump systems have attracted widespread attention due to their simultaneous power generation and heating functions. PVT modules absorb solar radiation to generate both electricity and heat. The heat generated by the PVT modules is used to directly heat the water in the heat storage tank, or to heat the refrigerant and then exchange heat between the refrigerant and the heat storage tank. A water pump, consuming relatively little electricity, removes the heat from the PVT panels to generate heat, thereby improving the overall energy efficiency of the system.

[0003] In solar energy systems, irradiance is a crucial system parameter, indispensable for user interaction, system operation and maintenance, strategy execution, and power generation prediction. Users can read irradiance as a key criterion for deciding whether to activate the system for power generation and heating that day; maintenance personnel can use the relationship between irradiance and power generation to detect faults, determine if components are dirty, or have microcracks or hot spots requiring replacement; irradiance can also be used as input to optimize the Maximum Power Point Tracking (MPPT) algorithm, helping the algorithm determine the direction of optimization calculations when irradiance changes, improving optimization efficiency and reducing power generation loss; long-term collection of system irradiance data can also establish a local database, refine the irradiance prediction model, and thus predict future irradiance, enabling power generation and heating prediction. In systems with energy storage, strategies can be used for energy dispatching, determining whether to store generated electricity in batteries or power heat pumps. Therefore, irradiance measurement is extremely important in solar energy systems.

[0004] Currently, irradiance measurement mainly relies on stand-alone irradiance meters, which are typically installed outside the system to collect solar irradiance data in real time. Summary of the Invention

[0005] The inventors noted that in related technologies, irradiation equipment used to measure irradiance is usually installed externally to the system. However, this approach has the following problems: first, the irradiation equipment, as an external device, increases the overall system cost; second, the installation location of the irradiation equipment may differ spatially from the PVT components, leading to deviations between the measured data and the actual irradiance received by the components; and third, the system integration is low, which is not conducive to the miniaturization and intelligent development of the equipment.

[0006] Accordingly, this disclosure provides an irradiance detection method that determines irradiance by collecting data on the flow rate of the heat exchange medium, the change in the temperature of the heat exchange medium, the surface temperature of the PVT component, and the ambient temperature, thereby achieving accurate, economical, and efficient measurement of irradiance without the need for an irradiation meter.

[0007] In a first aspect of this disclosure, an irradiance detection method is provided, executed by an irradiance detection device, comprising: acquiring, with a PVT module connected to a heat pump system, a heat exchanger flow rate, a first heat exchanger temperature at the outlet of the PVT module, a second heat exchanger temperature at the inlet of the PVT module, a surface temperature of the PVT module, and an ambient temperature. A first irradiance is determined based on the heat exchanger flow rate, the first heat exchanger temperature, the second heat exchanger temperature, the surface temperature, and the ambient temperature.

[0008] In some embodiments, the first irradiance is positively correlated with the heat exchange medium flow rate, the difference between the first and second heat exchange medium temperatures, and the difference between the surface temperature and the ambient temperature.

[0009] In some embodiments, the first irradiance includes: calculating the difference between the temperatures of a first heat exchange medium and a second heat exchange medium to obtain a first temperature difference; calculating the difference between the surface temperature and the ambient temperature to obtain a second temperature difference; determining a first intermediate value based on the specific heat capacity of the heat exchange medium, the flow rate of the heat exchange medium, and the first temperature difference; determining a second intermediate value based on a predetermined environmental dissipation coefficient, the surface area of ​​the PVT module, and the second temperature difference; determining a third intermediate value based on a predetermined short-circuit current temperature coefficient, the surface temperature, a predetermined temperature value, a predetermined photoelectric conversion efficiency corresponding to the predetermined temperature value, and the surface area of ​​the PVT module; and obtaining the first irradiance based on the first, second, and third intermediate values.

[0010] In some embodiments, obtaining the first irradiance based on the first intermediate value, the second intermediate value, and the third intermediate value includes: calculating the sum of the first intermediate value and the second intermediate value to obtain a fourth intermediate value; and calculating the ratio of the fourth intermediate value to the third intermediate value to obtain the first irradiance.

[0011] In some embodiments, determining the first intermediate value based on the specific heat capacity of the heat exchange medium, the flow rate of the heat exchange medium, and the first temperature difference includes: calculating the product of the specific heat capacity of the heat exchange medium, the flow rate of the heat exchange medium, and the first temperature difference to obtain the first intermediate value.

[0012] In some embodiments, determining the second intermediate value based on a predetermined environmental dissipation coefficient, the surface area of ​​the PVT component, and the second temperature difference includes: calculating the product of the predetermined environmental dissipation coefficient, the surface area of ​​the PVT component, and the second temperature difference to obtain the second intermediate value.

[0013] In some embodiments, determining the third intermediate value based on a predetermined short-circuit current temperature coefficient, surface temperature, a predetermined temperature value, a predetermined photoelectric conversion efficiency corresponding to the predetermined temperature value, and the surface area of ​​the PVT module includes: calculating the difference between the surface temperature and the predetermined temperature value to obtain a fifth intermediate value; calculating the product of the predetermined short-circuit current temperature coefficient and the fifth intermediate value to obtain a sixth intermediate value; calculating the difference between the predetermined photoelectric conversion efficiency and the sixth intermediate value to obtain a seventh intermediate value; calculating the difference between the predetermined parameter value and the seventh intermediate value to obtain an eighth intermediate value; and calculating the product of the eighth intermediate value and the surface area of ​​the PVT module to obtain a third intermediate value.

[0014] In some embodiments, when the PVT module is not connected to a heat pump system, the surface temperature of the PVT module and the ambient temperature are acquired. A second irradiance is determined based on the surface temperature and the ambient temperature.

[0015] In some embodiments, the second irradiance is positively correlated with the difference between the surface temperature and the ambient temperature.

[0016] In some embodiments, determining the second irradiance includes: calculating the difference between the surface temperature and the ambient temperature to obtain a third temperature difference; determining a ninth intermediate value based on a predetermined ambient dissipation coefficient and the third temperature difference; determining a tenth intermediate value based on a predetermined short-circuit current temperature coefficient, the surface temperature, a predetermined temperature value, and a predetermined photoelectric conversion efficiency corresponding to the predetermined temperature value; and obtaining the second irradiance based on the ninth and tenth intermediate values.

[0017] In some embodiments, obtaining the second irradiance based on the ninth intermediate value and the tenth intermediate value includes: calculating the ratio of the ninth intermediate value and the tenth intermediate value to obtain the second irradiance.

[0018] In some embodiments, determining the ninth intermediate value based on a predetermined environmental dissipation coefficient and a third temperature difference includes: calculating the product of the predetermined environmental dissipation coefficient and the third temperature difference to obtain the ninth intermediate value.

[0019] In some embodiments, determining the tenth intermediate value based on a predetermined short-circuit current temperature coefficient, surface temperature, a predetermined temperature value, and a predetermined photoelectric conversion efficiency corresponding to the predetermined temperature value includes: calculating the difference between the surface temperature and the predetermined temperature value to obtain an eleventh intermediate value; calculating the product of the predetermined short-circuit current temperature coefficient and the eleventh intermediate value to obtain a twelfth intermediate value; calculating the difference between the predetermined photoelectric conversion efficiency and the twelfth intermediate value to obtain a thirteenth intermediate value; and calculating the difference between a predetermined parameter value and the thirteenth intermediate value to obtain the tenth intermediate value.

[0020] In a second aspect of this disclosure, an irradiance detection device is provided, comprising: a memory configured to store instructions; and a processor coupled to the memory, the processor being configured to execute the method described in any of the above embodiments based on the instructions stored in the memory.

[0021] In a third aspect of this disclosure, a PVT heat pump system is provided, comprising: the irradiance detection device described in the above embodiments; a heat pump system including a heat storage tank, a circulation pump, and a heat pump connected in series by a heat exchange medium pipeline, wherein a first control valve is provided at the outlet of the heat pump, and a second control valve is provided at the inlet of the heat pump; a PVT branch including a PVT assembly, a third control valve disposed at the outlet of the PVT assembly, and a fourth control valve disposed at the inlet of the PVT assembly, wherein a first end of the PVT branch is connected to the heat exchange medium pipeline between the first control valve and the inlet of the heat storage tank, and a second end of the PVT branch is connected to the heat exchange medium pipeline between the second control valve and the circulation pump; a flow rate sensor configured to detect the flow rate of the heat exchange medium; a first temperature acquisition device configured to acquire the first heat exchange medium temperature at the outlet of the PVT assembly; a second temperature acquisition device configured to acquire the second heat exchange medium temperature at the inlet of the PVT assembly; a third temperature acquisition device configured to acquire the surface temperature of the PVT assembly; and a fourth temperature acquisition device configured to acquire the ambient temperature.

[0022] In some embodiments, the PVT assembly is connected to the heat pump system when the third and fourth control valves are open and the first and second control valves are closed. When the first and second control valves are open and the third and fourth control valves are closed, the PVT assembly is not connected to the heat pump system.

[0023] In some embodiments, the third temperature acquisition device includes a temperature sensor or an infrared temperature detection device.

[0024] According to a fourth aspect of the present disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions that, when executed by a processor, implement the method as described in any of the above embodiments.

[0025] According to a fifth aspect of the present disclosure, a computer program product is provided, including computer instructions, wherein when executed by a processor, the computer instructions implement the method as described in any of the above embodiments.

[0026] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic flowchart of an embodiment of the irradiance detection method disclosed herein.

[0029] Figure 2 This is a schematic flowchart of an irradiance detection method according to another embodiment of the present disclosure.

[0030] Figure 3 This is a schematic diagram of the structure of an irradiance detection device according to an embodiment of the present disclosure.

[0031] Figure 4 This is a schematic diagram of the structure of a PVT heat pump system according to an embodiment of the present disclosure.

[0032] Figure 5 This is a schematic diagram of the structure of a PVT heat pump system according to another embodiment of the present disclosure. Detailed Implementation

[0033] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0034] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure.

[0035] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0036] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0037] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0039] Figure 1 This is a schematic flowchart of an irradiance detection method according to an embodiment of the present disclosure. In some embodiments, the following irradiance detection method is performed by an irradiance detection device, including steps 101-102.

[0040] In step 101, when the PVT module is connected to the heat pump system, the heat exchange medium flow rate, the first heat exchange medium temperature at the outlet of the PVT module, the second heat exchange medium temperature at the inlet of the PVT module, the surface temperature of the PVT module, and the ambient temperature are obtained.

[0041] In some embodiments, the flow rate of the heat exchange medium is detected by a flow rate sensor, the temperature of the first heat exchange medium at the outlet of the PVT module is collected by a first temperature acquisition device, the temperature of the second heat exchange medium at the inlet of the PVT module is collected by a second temperature acquisition device, the surface temperature of the PVT module is collected by a third temperature acquisition device, and the ambient temperature is collected by a fourth temperature acquisition device.

[0042] For example, the first temperature acquisition device is a temperature sensor, the second temperature acquisition device is a temperature sensor, the third temperature acquisition device is a temperature sensor or an infrared temperature detection device, and the fourth temperature acquisition device is a temperature sensor.

[0043] In step 102, the first irradiance is determined based on the heat exchange medium flow rate, the first heat exchange medium temperature, the second heat exchange medium temperature, the surface temperature, and the ambient temperature.

[0044] Therefore, without the need for an irradiation meter, accurate and efficient measurement of the first irradiance of a PVT module connected to a heat pump system can be achieved by detecting the flow rate of the heat exchange medium, the temperature of the first heat exchange medium at the outlet of the PVT module, the temperature of the second heat exchange medium at the inlet of the PVT module, the surface temperature of the PVT module, and the ambient temperature.

[0045] In some embodiments, the first irradiance is positively correlated with the heat exchange medium flow rate, the difference between the first and second heat exchange medium temperatures, and the difference between the surface temperature and the ambient temperature.

[0046] For example, when the flow rate of the heat exchange medium increases, the first irradiance increases; when the flow rate of the heat exchange medium decreases, the first irradiance decreases.

[0047] For example, when the difference between the temperatures of the first and second heat exchange media increases, the first irradiance increases; when the difference between the temperatures of the first and second heat exchange media decreases, the first irradiance decreases.

[0048] For example, when the difference between the surface temperature of the PVT module and the ambient temperature increases, the first irradiance increases; when the difference between the surface temperature of the PVT module and the ambient temperature decreases, the first irradiance decreases.

[0049] Therefore, the first irradiance can be qualitatively analyzed based on the heat exchange medium flow rate, the difference between the first and second heat exchange medium temperatures, or the difference between the surface temperature and the ambient temperature.

[0050] In some embodiments, the step of determining the first irradiance based on the heat exchange medium flow rate, the first heat exchange medium temperature, the second heat exchange medium temperature, the surface temperature, and the ambient temperature includes steps S11-S16.

[0051] In step S11, the difference between the temperature of the first heat exchange medium and the temperature of the second heat exchange medium is calculated to obtain the first temperature difference.

[0052] For example, the temperature of the first heat exchange medium at the outlet of the PVT module is The temperature of the second heat exchange medium at the inlet of the PVT module is ,calculate and The difference is used to obtain the first temperature difference.

[0053] In step S12, the difference between the surface temperature and the ambient temperature is calculated to obtain the second temperature difference.

[0054] For example, the surface temperature of a PVT module is The ambient temperature is ,calculate and The difference is used to obtain the second temperature difference.

[0055] In step S13, a first intermediate value is determined based on the specific heat capacity of the heat exchange medium, the flow rate of the heat exchange medium, and the first temperature difference.

[0056] In some embodiments, the product of the specific heat capacity of the heat exchange medium, the flow rate of the heat exchange medium, and the first temperature difference is calculated to obtain a first intermediate value.

[0057] For example, the formula for calculating the first intermediate value is shown in formula (1).

[0058] First intermediate value = (1).

[0059] In formula (1), c The specific heat capacity of the heat exchange medium.v The heat exchange medium flow rate, The temperature of the first heat exchange medium at the outlet of the PVT module. This is the temperature of the second heat exchange medium at the inlet of the PVT module.

[0060] According to formula (1), the first intermediate value is related to the first heat exchange medium temperature at the outlet of the PVT module. and the temperature of the second heat exchange medium at the inlet of the PVT module The difference is proportional, so the first intermediate value can reflect the heat power carried away by the heat exchange medium from the back plate of the PVT module.

[0061] It should be noted here that the specific heat capacity of the heat exchange medium... c The heat absorbed or released by a unit mass of heat exchange medium for every 1 degree Celsius change is used to characterize the heat absorbed or released by the heat exchange medium. By calculating the product of the specific heat capacity of the heat exchange medium, the flow rate of the heat exchange medium, and the first temperature difference, the heat power carried away by the heat exchange medium from the backsheet of the PVT module can be accurately calculated.

[0062] In step S14, a second intermediate value is determined based on a predetermined environmental dissipation coefficient, the surface area of ​​the PVT component, and the second temperature difference.

[0063] In some embodiments, a second intermediate value is obtained by calculating the product of a predetermined environmental dissipation coefficient, the surface area of ​​the PVT component, and the second temperature difference.

[0064] For example, the formula for calculating the second intermediate value is shown in formula (2).

[0065] Second intermediate value = (2).

[0066] In formula (2), h The predetermined environmental dissipation factor, S The surface area of ​​the PVT component. The surface temperature of the PVT module. The ambient temperature.

[0067] According to formula (2), the second intermediate value is related to the surface temperature of the PVT module. and ambient temperature The difference is proportional, and thus the second intermediate value can reflect the heat power dissipated by the PVT module to the environment.

[0068] It should be noted that by calculating the heat dissipation to the environment, the influence of the environment on the heat power of the PVT module can be corrected, thereby eliminating the calculation error caused by environmental heat dissipation.

[0069] In step S15, a third intermediate value is determined based on the predetermined short-circuit current temperature coefficient, surface temperature, predetermined temperature value, predetermined photoelectric conversion efficiency corresponding to the predetermined temperature value, and surface area of ​​the PVT module.

[0070] In some embodiments, the difference between the surface temperature and a predetermined temperature value is calculated to obtain a fifth intermediate value. The product of the predetermined short-circuit current temperature coefficient and the fifth intermediate value is calculated to obtain a sixth intermediate value. The difference between the predetermined photoelectric conversion efficiency and the sixth intermediate value is calculated to obtain a seventh intermediate value. The difference between the predetermined parameter value and the seventh intermediate value is calculated to obtain an eighth intermediate value. The product of the eighth intermediate value and the surface area of ​​the PVT module is calculated to obtain a third intermediate value.

[0071] For example, the formula for calculating the third intermediate value is shown in formula (3).

[0072] Third intermediate value = (3).

[0073] In formula (3), N For the predetermined parameter value, To determine the temperature coefficient of the short-circuit current, The surface temperature of the PVT module. For the predetermined temperature value, To and The corresponding predetermined photoelectric conversion efficiency.

[0074] According to formula (3), the third intermediate value reflects the heat radiated by solar energy onto the PVT module.

[0075] For example, a predetermined temperature value The temperature is 25 degrees Celsius, and the predetermined parameter value is... N The value is 1.

[0076] It should be noted that by setting predetermined temperature and parameter values, and combining them with the predetermined short-circuit current temperature coefficient of the PVT module, the predetermined photoelectric conversion efficiency, and the surface temperature, the heat radiated by the sun onto the PVT module can be accurately obtained.

[0077] In step S16, the first irradiance is obtained based on the first intermediate value, the second intermediate value, and the third intermediate value.

[0078] In some embodiments, the sum of the first and second intermediate values ​​is calculated to obtain a fourth intermediate value. The ratio of the fourth intermediate value to the third intermediate value is calculated to obtain the first irradiance.

[0079] For example, the formula for calculating the first irradiance is shown in formula (4).

[0080] (4).

[0081] In formula (4), The initial irradiance when PVT components are connected to a heat pump system. c The specific heat capacity of the heat exchange medium. The temperature of the first heat exchange medium at the outlet of the PVT module. This refers to the temperature of the second heat exchange medium at the inlet of the PVT module. h The predetermined environmental dissipation factor, S The surface area of ​​the PVT component. The surface temperature of the PVT module. For ambient temperature, N For the predetermined parameter value, To determine the temperature coefficient of the short-circuit current, For the predetermined temperature value, To and The corresponding predetermined photoelectric conversion efficiency.

[0082] In some embodiments, a predetermined parameter value is set. N =1, the predetermined temperature value If the value is 25, then the formula for calculating the first irradiance is shown in formula (5).

[0083] (5).

[0084] Therefore, without the need for an irradiation meter, an accurate first irradiance can be obtained simply by measuring the relevant parameters.

[0085] For example, the first irradiance calculated based on formula (5) and the irradiance actually measured by the meteorological station are shown in Table 1.

[0086] Table 1 Comparison of the first irradiance with the measured values ​​at the meteorological station.

[0087]

[0088] As can be seen from Table 1, the first irradiance calculated based on formula (5) is highly consistent with the irradiance value actually measured by the meteorological station. The absolute and relative errors of the two are both within a small range, which verifies the accuracy and reliability of the first irradiance calculated based on formula (5).

[0089] Therefore, without the need for an irradiation meter, the first irradiance of a PVT module can be obtained by calculating the heat power carried away by the heat exchange medium from the backsheet of the PVT module, the heat power dissipated by the PVT module to the environment, and the heat radiated by solar energy onto the PVT module.

[0090] Figure 2This is a schematic flowchart of an irradiance detection method according to another embodiment of the present disclosure. In some embodiments, the following irradiance detection method is performed by an irradiance detection device, including steps 201-202.

[0091] In step 201, when the PVT module is not connected to the heat pump system, the surface temperature of the PVT module and the ambient temperature are obtained.

[0092] In some embodiments, the surface temperature of the PVT component is acquired by a third temperature acquisition device, and the ambient temperature is acquired by a fourth temperature acquisition device.

[0093] For example, the third temperature acquisition device is a temperature sensor or an infrared temperature detection device, and the fourth temperature acquisition device is a temperature sensor.

[0094] In step 202, the second irradiance is determined based on the surface temperature of the PVT component and the ambient temperature.

[0095] Therefore, without the need for an irradiation meter, accurate and efficient measurement of the second irradiance can be achieved by detecting the surface temperature of the PVT module and the ambient temperature, even when the PVT module is not connected to a heat pump system.

[0096] In some embodiments, the second irradiance is positively correlated with the difference between the surface temperature of the PVT module and the ambient temperature.

[0097] For example, when the difference between the surface temperature of the PVT module and the ambient temperature increases, the second irradiance increases; when the difference between the surface temperature of the PVT module and the ambient temperature decreases, the second irradiance decreases.

[0098] Therefore, the second irradiance can be qualitatively analyzed based on the difference between the surface temperature of the PVT module and the ambient temperature.

[0099] In some embodiments, the step of determining the second irradiance based on the surface temperature of the PVT component and the ambient temperature includes steps S21-S24.

[0100] In step S21, the difference between the surface temperature and the ambient temperature is calculated to obtain the third temperature difference.

[0101] For example, when the PVT module is not connected to the heat pump system, the surface temperature of the PVT module is The ambient temperature is ,calculate and The difference is used to obtain the third temperature difference.

[0102] In step S22, the ninth intermediate value is determined based on the predetermined environmental dissipation coefficient and the third temperature difference.

[0103] In some embodiments, the product of a predetermined environmental dissipation coefficient and a third temperature difference is calculated to obtain a ninth intermediate value.

[0104] For example, the formula for calculating the ninth intermediate value is shown in formula (6).

[0105] Ninth Intermediate Value = (6).

[0106] In formula (6), h The predetermined environmental dissipation factor, The surface temperature of the PVT module. The ambient temperature.

[0107] According to formula (6), the ninth intermediate value is related to the surface temperature of the PVT module. and ambient temperature The difference is proportional. Therefore, the ninth intermediate value can reflect the heat power dissipated by the PVT module to the environment when the PVT module is not connected to the heat pump system.

[0108] In step S23, the tenth intermediate value is determined based on the predetermined short-circuit current temperature coefficient, surface temperature, predetermined temperature value, and predetermined photoelectric conversion efficiency corresponding to the predetermined temperature value.

[0109] In some embodiments, the difference between the surface temperature and a predetermined temperature value is calculated to obtain an eleventh intermediate value. The product of the predetermined short-circuit current temperature coefficient and the eleventh intermediate value is calculated to obtain a twelfth intermediate value. The difference between the predetermined photoelectric conversion efficiency and the twelfth intermediate value is calculated to obtain a thirteenth intermediate value. The difference between the predetermined parameter value and the thirteenth intermediate value is calculated to obtain a tenth intermediate value.

[0110] The formula for calculating the tenth intermediate value is shown in formula (7).

[0111] The tenth intermediate value = (7).

[0112] In formula (7), N For the predetermined parameter value, To determine the temperature coefficient of the short-circuit current, The surface temperature of the PVT module. For the predetermined temperature value, To and The corresponding predetermined photoelectric conversion efficiency.

[0113] According to formula (7), the tenth intermediate value reflects the heat situation of solar radiation on the PVT module.

[0114] For example, the predetermined temperature value is 25 degrees Celsius, and the predetermined parameter value is 1.

[0115] Therefore, by using predetermined temperature and parameter values, and combining them with the predetermined short-circuit current temperature coefficient of the PVT module, the predetermined photoelectric conversion efficiency and surface temperature can be accurately obtained to measure the heat radiated by the sun onto the PVT module.

[0116] In step S24, the second irradiance is obtained based on the ninth intermediate value and the tenth intermediate value.

[0117] It should be noted that the second irradiance is obtained by calculating the ratio of the heat power dissipated by the PVT module to the heat radiated by the sun onto the PVT module.

[0118] For example, the formula for calculating the second irradiance is shown in formula (8).

[0119] (8).

[0120] Since the numerator and denominator of formula (8) have the same parameter S Therefore, the parameters can be... S Simplify by elimination. That is, the second irradiance can be obtained by calculating the ratio of the ninth intermediate value to the tenth intermediate value.

[0121] For example, the formula for calculating the second irradiance is shown in formula (9).

[0122] (9).

[0123] In formula (9), This is the second irradiance when the PVT module is not connected to the heat pump system. h The predetermined environmental dissipation factor, The surface temperature of the PVT module. For ambient temperature, N For the predetermined parameter value, To determine the temperature coefficient of the short-circuit current, For the predetermined temperature value, To and The corresponding predetermined photoelectric conversion efficiency.

[0124] Therefore, without the need for an irradiation meter, an accurate second irradiance can be obtained simply by measuring the relevant parameters.

[0125] In some embodiments, a predetermined parameter value is set. N =1, the predetermined temperature value If the value is 25, then the formula for calculating the second irradiance is shown in formula (10).

[0126] (10).

[0127] Therefore, without the need for an irradiation meter, the second irradiance of the PVT module when it is not connected to a heat pump system can be accurately calculated by utilizing the heat power dissipated by the PVT module to the environment and the heat radiated by solar energy onto the PVT module.

[0128] Figure 3 This is a schematic diagram of the structure of an irradiance detection device according to an embodiment of the present disclosure.

[0129] like Figure 3 As shown, the irradiance detection device 30 can be represented in the form of a general-purpose computing device. The irradiance detection device 30 includes a memory 31, a processor 32, and a bus 33 connecting different system components.

[0130] The memory 31 may include, for example, system memory, non-volatile storage media, etc. System memory may store, for example, an operating system, application programs, a boot loader, and other programs. System memory may include volatile storage media, such as random access memory (RAM) and / or cache memory. Non-volatile storage media may store, for example, instructions for a corresponding embodiment of at least one irradiance detection method being executed. Non-volatile storage media include, but are not limited to, disk storage, optical storage, flash memory, etc.

[0131] Processor 32 can be implemented using a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic devices, discrete hardware components such as discrete gates or transistors. Accordingly, each module, such as the acquisition module, calculation module, and adjustment module, can be implemented by executing instructions in the central processing unit (CPU) running memory to perform the corresponding steps, or by implementing dedicated circuitry to perform the corresponding steps.

[0132] For example, processor 32 is configured for memory-based instruction execution implementation such as Figure 1-2 The method involved in any of the embodiments.

[0133] Bus 33 can use any of the various bus architectures. For example, bus architectures include, but are not limited to, the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MCA) bus, and the Peripheral Component Interconnect (PCI) bus.

[0134] The interfaces 34, 35, and 36 of the irradiance detection device 30, as well as the memory 31 and processor 32, can be connected via bus 33. Input / output interface 34 provides a connection interface for input / output devices such as monitors, mice, and keyboards. Network interface 35 provides a connection interface for various networked devices. Storage interface 36 provides a connection interface for external storage devices such as floppy disks, USB flash drives, and SD cards.

[0135] Various aspects of this disclosure are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus, and computer program products according to embodiments of this disclosure. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations thereof, can be implemented by computer-readable program instructions.

[0136] These computer-readable program instructions are provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable device to produce a machine, such that execution of the instructions by the processor produces means for implementing the functions specified in one or more boxes of the flowchart and / or block diagram.

[0137] These computer-readable program instructions may also be stored in a computer-readable storage medium. These instructions cause a computer to work in a particular manner to produce an article of manufacture, including instructions that implement the functions specified in one or more boxes in a flowchart and / or block diagram.

[0138] This disclosure may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects.

[0139] This disclosure also provides a computer-readable storage medium storing computer instructions that, when executed by a processor, implement... Figure 1-2 The method involved in any of the embodiments.

[0140] This disclosure also provides a computer program product, including computer instructions, wherein the computer instructions, when executed by a processor, implement as follows: Figure 1-2 The method involved in any of the embodiments.

[0141] Figure 4 This is a schematic diagram of the structure of a PVT heat pump system according to an embodiment of the present disclosure.

[0142] like Figure 4 As shown, the PVT heat pump system includes an irradiance detection device 410, a heat pump system 420, a PVT branch 430, a first temperature acquisition device 441, a second temperature acquisition device 442, a third temperature acquisition device 443, a fourth temperature acquisition device 444, and a flow rate sensor 445.

[0143] Irradiance detection device 410 is Figure 3 The irradiance detection device shown in any of the embodiments. For example, the irradiance detection device 410 is used to collect data from the first temperature acquisition device 441, the second temperature acquisition device 442, the third temperature acquisition device 443, the fourth temperature acquisition device 444, and the flow rate sensor 445.

[0144] The heat pump system 420 includes a heat pump 421, a heat storage tank 422, and a circulating pump 423 connected in series by heat exchange working fluid pipelines. A first control valve 431 is provided at the outlet of the heat pump 421, and a second control valve 432 is provided at the inlet of the heat pump.

[0145] PVT branch 430 includes PVT assembly 424, a third control valve 433 disposed at the outlet of PVT assembly 424, and a fourth control valve 434 disposed at the inlet of PVT assembly. The first end of PVT branch 430 is connected to the heat exchange medium pipeline between the first control valve 431 and the inlet of the heat storage tank 422, and the second end of PVT branch 430 is connected to the heat exchange medium pipeline between the second control valve 432 and the circulating pump 423.

[0146] The first temperature acquisition device 441 is configured to acquire the temperature of the first heat exchange medium at the outlet of the PVT component 424. For example, the first temperature acquisition device 441 is a temperature sensor.

[0147] The second temperature acquisition device 442 is configured to acquire the temperature of the second heat exchange medium at the inlet of the PVT component 424. For example, the second temperature acquisition device 442 is a temperature sensor.

[0148] The third temperature acquisition device 443 is configured to acquire the surface temperature of the PVT component 424.

[0149] In some embodiments, the third temperature acquisition device 443 includes a temperature sensor or an infrared temperature detection device.

[0150] It should be noted that the infrared temperature detection device can perform non-contact temperature distribution measurement on the surface of the PVT component 424, thereby more accurately estimating the irradiance distribution. This further improves measurement accuracy, making it particularly suitable for irradiance measurement under non-uniform irradiance environments, thus enhancing the system's adaptability to complex lighting conditions.

[0151] The fourth temperature acquisition device 444 is configured to acquire ambient temperature. For example, the fourth temperature acquisition device 444 is a temperature sensor.

[0152] The flow rate sensor 445 is configured to detect the flow rate of the heat exchange medium.

[0153] Therefore, by collecting data on the heat exchange medium flow rate, the first heat exchange medium temperature, the second heat exchange medium temperature, the surface temperature of the PVT module 424, and the ambient temperature, the first irradiance when the PVT module 424 is connected to the heat pump system 420 can be determined. And by collecting data on the surface temperature of the PVT module 424 and the ambient temperature, the second irradiance when the PVT module 424 is not connected to the heat pump system 420 can be determined.

[0154] When the irradiance detection device 410 controls the third control valve 433 and the fourth control valve 434 to open, and controls the first control valve 431 and the second control valve 432 to close, the PVT assembly 424 is connected to the heat pump system. The circulating pump 423 extracts the heat exchange medium from the heat storage tank 422 and circulates it through the PVT assembly 424 for heating. Simultaneously, the first temperature acquisition device 441 and the second temperature acquisition device 442 at the inlet and outlet of the PVT assembly 424 measure the temperature of the heat exchange medium at the outlet and inlet of the PVT assembly 424, respectively. The flow rate sensor 445 measures the flow rate of the heat exchange medium, the third temperature acquisition device 443 acquires the surface temperature of the PVT assembly 424, and the fourth temperature acquisition device 444 acquires the ambient temperature. These data are collected by the irradiance detection device 410 and used to calculate the first irradiance at this time.

[0155] When the irradiance detection device 410 controls the first control valve 431 and the second control valve 432 to open, and controls the third control valve 433 and the fourth control valve 434 to close, the PVT component 424 is not connected to the heat pump system. At this time, the heat pump 421 circulates and heats the heat exchange medium in the heat storage box. At the same time, the third temperature acquisition device 443 acquires the surface temperature of the PVT component 424, and the fourth temperature acquisition device 444 acquires the ambient temperature. These data are acquired by the irradiance detection device 410 and used to calculate the second irradiance at this time.

[0156] Therefore, the irradiance detection device 410 can control the PVT module 424 to connect to the heat pump system 420, thereby calculating the irradiance of the PVT module 424 in different modes.

[0157] In some embodiments, such as Figure 4 As shown, the PVT heat pump system also includes an outlet pipe 446, which is connected to the user side and controlled by the user. When it is necessary to use the heated heat exchange medium, the outlet pipe 446 can be opened.

[0158] In some embodiments, such as Figure 4 As shown, the PVT heat pump system also includes a fifth control valve 435. When the heat storage tank 422 needs to be filled with unheated heat exchange medium, the irradiance detection device 410 controls the fifth control valve 435 to open, so as to add unheated heat exchange medium to the heat storage tank 422.

[0159] Figure 5 This is a schematic diagram of the structure of a PVT heat pump system according to another embodiment of the present disclosure.

[0160] like Figure 5 As shown, the PVT heat pump system includes a temperature sampling module 510, a valve control circuit module 520, a peripheral communication module 530, and an MCU module 540.

[0161] When the PVT heat pump system starts up, the MCU module 540 acts as the system's judgment and control center, completing the task of summarizing data information and calculating the current irradiance. In addition, the MCU module 540 controls the other modules and equipment within the system.

[0162] Specifically, the MCU module 540 performs AD conversion on the data in the temperature sampling module 510, controls the signals of the first control valve 431, the second control valve 432, the third control valve 433, the fourth control valve 434, and the fifth control valve 435 in the valve control circuit module 520, acquires data from the heat pump 421, the flow rate sensor 445, and the fourth temperature acquisition device 444 in the peripheral communication module 530, and monitors and controls the status of the system.

[0163] In some embodiments, an operational amplifier circuit is used to acquire the temperatures at the inlet and outlet of the PVT component 424 and the surface temperature of the PVT component 424. R2 is a temperature-sensing resistor; its 3.3V power supply is isolated by the L1 coil and filtered by capacitor C3 and resistor R3 to provide a stable voltage. Then, resistors R2 and R1 form a voltage divider. As the resistance of R2 changes with the inlet and outlet temperatures of the heat exchange medium and the surface temperature of the PVT component 424, the voltage across resistor R1 also changes. Capacitors C1 and C2 are used for decoupling and bypassing, respectively, to remove high- and low-frequency interference. The voltage signal is transmitted to the MCU module 540 via operational amplifier U1, where it is converted to a temperature value after AD conversion and data processing for subsequent irradiance calculation.

[0164] Depending on the specific scenario and strategy requirements, the MCU module 540 outputs control signals through a GPIO port (not shown), which are then boosted by the isolation module 521 and output to capacitors C4, C5, and C6 to stabilize the voltage at the input terminals of relays K1, K2, and K3. When the PVT component 424 is not connected to the heat pump system 420, the MCU module 540 outputs a high level, maintaining a high voltage at capacitor C4 and a low voltage at capacitors C5 and C6 through the isolation module 521. This causes relays K1 to close and K2 and K3 to open, forming a loop between the first control valve 431, the second control valve 432, and the AC power grid. This completes the power supply to open the first control valve 431 and the second control valve 432, thereby forming a loop between the heat storage tank 422, the circulating pump 423, and the heat pump 421, enabling the heat pump 421 to heat the heat exchange medium.

[0165] When the PVT component 424 is connected to the heat pump system 420, the MCU module 540 outputs a high level, which maintains a high voltage on capacitor C5 and a low voltage on capacitors C4 and C6 through the isolation module 521, causing relay K2 to close and K1 and K3 to open. The third control valve 433 and the fourth control valve 434 form a circuit with the AC power grid, completing the power supply to open the third control valve 433 and the fourth control valve 434, thereby connecting the PVT component 424 to the heat pump system and realizing the heating of the heat exchange medium by the PVT component 424.

[0166] When the thermal storage tank 422 needs to be filled with unheated heat exchange medium, the MCU module 540 outputs a high level, the isolation module 521 maintains the high voltage of capacitor C6, causing the relay K3 to close, and the fifth control valve 435 forms a circuit with the AC power grid, completing the power supply to open the fifth control valve 435, thereby realizing the addition of heat exchange medium into the thermal storage tank 422.

[0167] In some embodiments, the peripheral communication module 530 collects the heat exchange medium flow rate measured by the flow rate sensor 445 and the ambient temperature measured by the fourth temperature acquisition device 444 via the communication circuit 531 for use in irradiance calculation. Furthermore, the peripheral communication module 530 can also monitor the data of the heat pump 421, determine its operating status, and thus control the on / off operation of the heat pump 421 by issuing commands.

[0168] In the above embodiments, by integrating multiple sensors and main control circuits, the measurement of solar irradiance under different operating conditions is realized, avoiding the use of external irradiance meters and improving system integration and economy.

[0169] By implementing the above embodiments of this disclosure, the following beneficial effects can be obtained.

[0170] (1) Utilizing the temperature rise effect generated by the heat exchange medium flowing across the back of the PVT module when it is connected to the heat pump system, the temperature change of the heat exchange medium is measured by a temperature acquisition device, and the heat collection power is calculated by combining the heat exchange medium flow rate, ambient temperature and other parameters, thereby deriving the solar irradiance value. At the same time, when the PVT module is not connected to the heat pump system, its surface temperature is measured by a temperature acquisition device to further estimate the irradiance.

[0171] (2) This disclosure avoids the use of external irradiation meters, improves the overall integration of the system, reduces equipment costs, and improves the consistency between the measurement results and the actual irradiation received by the PVT components, thereby achieving accurate, economical and efficient irradiance measurement technology.

[0172] In some embodiments, the functional units described above may be implemented as general-purpose processors, programmable logic controllers (PLCs), digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof for performing the functions described herein.

[0173] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0174] The description in this disclosure is provided for illustrative and descriptive purposes only and is not intended to be exhaustive or to limit the disclosure to its forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of this disclosure and to enable those skilled in the art to understand this disclosure and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An irradiance detection method, executed by an irradiance detection device, comprising: When a photovoltaic thermal PVT module is connected to a heat pump system, the heat exchange medium flow rate, the first heat exchange medium temperature at the outlet of the PVT module, the second heat exchange medium temperature at the inlet of the PVT module, the surface temperature of the PVT module, and the ambient temperature are obtained. The first irradiance is determined based on the heat exchange medium flow rate, the first heat exchange medium temperature, the second heat exchange medium temperature, the surface temperature, and the ambient temperature. The first irradiance is positively correlated with the flow rate of the heat exchange medium, the difference between the temperature of the first heat exchange medium and the temperature of the second heat exchange medium, and the difference between the surface temperature and the ambient temperature. Determining the first irradiance includes: Calculate the difference between the temperature of the first heat exchange medium and the temperature of the second heat exchange medium to obtain the first temperature difference; The difference between the surface temperature and the ambient temperature is calculated to obtain the second temperature difference; A first intermediate value is determined based on the specific heat capacity of the heat exchange medium, the flow rate of the heat exchange medium, and the first temperature difference, wherein the first intermediate value is obtained by calculating the product of the specific heat capacity of the heat exchange medium, the flow rate of the heat exchange medium, and the first temperature difference. A second intermediate value is determined based on a predetermined environmental dissipation coefficient, the surface area of ​​the PVT component, and the second temperature difference, wherein the second intermediate value is obtained by calculating the product of the predetermined environmental dissipation coefficient, the surface area of ​​the PVT component, and the second temperature difference; A third intermediate value is determined based on a predetermined short-circuit current temperature coefficient, the surface temperature, a predetermined temperature value, a predetermined photoelectric conversion efficiency corresponding to the predetermined temperature value, and the surface area of ​​the PVT module. A fifth intermediate value is obtained by calculating the difference between the surface temperature and the predetermined temperature value. A sixth intermediate value is obtained by multiplying the predetermined short-circuit current temperature coefficient and the fifth intermediate value. A seventh intermediate value is obtained by calculating the difference between the predetermined photoelectric conversion efficiency and the sixth intermediate value. An eighth intermediate value is obtained by calculating the difference between a predetermined parameter value and the seventh intermediate value. Finally, a third intermediate value is obtained by multiplying the eighth intermediate value and the surface area of ​​the PVT module. The first irradiance is obtained based on the first intermediate value, the second intermediate value, and the third intermediate value, wherein the sum of the first intermediate value and the second intermediate value is calculated to obtain a fourth intermediate value, and the ratio of the fourth intermediate value to the third intermediate value is calculated to obtain the first irradiance.

2. The irradiance detection method according to claim 1 further includes: When the PVT component is not connected to the heat pump system, the surface temperature of the PVT component and the ambient temperature are obtained; The second irradiance is determined based on the surface temperature and the ambient temperature.

3. The irradiance detection method according to claim 2, wherein, The second irradiance is positively correlated with the difference between the surface temperature and the ambient temperature.

4. The irradiance detection method according to claim 3, wherein, Determining the second irradiance includes: The difference between the surface temperature and the ambient temperature is calculated to obtain the third temperature difference; The ninth intermediate value is determined based on the predetermined environmental dissipation coefficient and the third temperature difference; The tenth intermediate value is determined based on the predetermined short-circuit current temperature coefficient, the surface temperature, the predetermined temperature value, and the predetermined photoelectric conversion efficiency corresponding to the predetermined temperature value. The second irradiance is obtained based on the ninth intermediate value and the tenth intermediate value.

5. The irradiance detection method according to claim 4, wherein, The step of obtaining the second irradiance based on the ninth intermediate value and the tenth intermediate value includes: The ratio of the ninth intermediate value to the tenth intermediate value is calculated to obtain the second irradiance.

6. The irradiance detection method according to claim 4, wherein, The determination of the ninth intermediate value based on the predetermined environmental dissipation coefficient and the third temperature difference includes: The ninth intermediate value is obtained by multiplying the predetermined environmental dissipation coefficient and the third temperature difference.

7. The irradiance detection method according to claim 4, wherein, The step of determining the tenth intermediate value based on the predetermined short-circuit current temperature coefficient, the surface temperature, the predetermined temperature value, and the predetermined photoelectric conversion efficiency corresponding to the predetermined temperature value includes: Calculate the difference between the surface temperature and the predetermined temperature value to obtain the eleventh intermediate value; Calculate the product of the predetermined short-circuit current temperature coefficient and the eleventh intermediate value to obtain the twelfth intermediate value; The difference between the predetermined photoelectric conversion efficiency and the twelfth intermediate value is calculated to obtain the thirteenth intermediate value; The difference between the predetermined parameter value and the thirteenth intermediate value is calculated to obtain the tenth intermediate value.

8. An irradiance detection device, comprising: The memory is configured to store instructions; A processor, coupled to a memory, configured to implement the method as described in any one of claims 1-7 based on memory-stored instruction execution.

9. A PVT heat pump system, comprising: The irradiance detection device as described in claim 8; A heat pump system includes a heat storage tank, a circulating pump, and a heat pump connected in series by heat exchange medium pipelines, wherein a first control valve is provided at the outlet of the heat pump and a second control valve is provided at the inlet of the heat pump. The PVT branch includes a PVT assembly, a third control valve disposed at the outlet of the PVT assembly, and a fourth control valve disposed at the inlet of the PVT assembly. The first end of the PVT branch is connected to the heat exchange medium pipeline between the first control valve and the inlet of the heat storage tank, and the second end of the PVT branch is connected to the heat exchange medium pipeline between the second control valve and the circulating pump. A flow rate sensor is configured to detect the flow rate of the heat exchange medium; The first temperature acquisition device is configured to acquire the temperature of the first heat exchange medium at the outlet of the PVT component. The second temperature acquisition device is configured to acquire the temperature of the second heat exchange medium at the inlet of the PVT component. The third temperature acquisition device is configured to acquire the surface temperature of the PVT module; The fourth temperature acquisition device is configured to acquire ambient temperature.

10. The PVT heat pump system according to claim 9, wherein, When the third control valve and the fourth control valve are in the open state, and the first control valve and the second control valve are in the closed state, the PVT component is connected to the heat pump system; When the first and second control valves are in the open state, and the third and fourth control valves are in the closed state, the PVT component is not connected to the heat pump system.

11. The PVT heat pump system according to claim 9 or 10, wherein, The third temperature acquisition device includes a temperature sensor or an infrared temperature detection device.

12. A computer-readable storage medium, wherein, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the irradiance detection method as described in any one of claims 1-7.

13. A computer program product comprising computer instructions, wherein the computer instructions, when executed by a processor, implement the irradiance detection method as claimed in any one of claims 1-7.

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