Solar photovoltaic-photothermal coupling air source heat pump defrosting system and method

Abstract

The application provides a solar photovoltaic photo-thermal coupling air source heat pump defrosting system and method, wherein the solar photovoltaic photo-thermal coupling air source heat pump defrosting method comprises the following steps: obtaining the water temperature in a heat storage water tank in a solar photo-thermal assembly; and based on the water temperature and a defrosting signal output by an air source heat pump unit, controlling the air source heat pump unit to take heat from the heat storage water tank for defrosting. The method uses the heat storage of photo-thermal to provide heat for the defrosting of the air source heat pump unit, avoids the influence of the defrosting process of the air source heat pump unit on the heating, hot water supply and drying process, improves the stability of the whole process of the air source heat pump unit for heating, hot water supply and drying, effectively improves the defrosting efficiency of the air source heat pump unit, effectively improves the utilization rate of renewable energy, and has high practicability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of defrosting control, and particularly relates to a solar photovoltaic-photothermal coupled air source heat pump defrosting system and method. BACKGROUND

[0002] The air source heat pump is an energy-saving device for making heat flow from a low-level heat source to a high-level heat source by using high-level energy, and can meet the needs of heating, hot water supply and drying, and is widely used in the construction industry in recent years. However, the air source heat pump unit has the problem of frosting during the heating process, especially at night, which seriously affects the working efficiency of the air source heat pump. Therefore, how to efficiently defrost the air source heat pump unit has become a key problem to be solved.

[0003] In the related art, the air source heat pump unit usually adopts the reverse defrosting method for defrosting, that is, the controller controls the orderly operation of the electric control four-way valve, the compressor, the evaporator and the circulating pump, and the heating, valve stopping, defrosting and valve stopping are alternately performed, during which the controller records the last heating time and the immediately following defrosting time, and determines the next heating time by using the optimal defrosting time obtained by experiment.

[0004] However, although the reverse defrosting method can obtain a good energy efficiency ratio by adjusting the heating operation period, the defrosting time and the defrosting time, it will affect the temperature change of heating, hot water supply and drying, resulting in low stability of the air source heat pump heating, hot water supply and drying process, and low defrosting efficiency. SUMMARY

[0005] The present application provides a solar photovoltaic-photothermal coupled air source heat pump defrosting system and method to solve the defects of low stability of the air source heat pump heating, hot water supply and drying process and low defrosting efficiency caused by the reverse defrosting of the air source heat pump unit in the prior art, and to achieve the purpose of improving the stability of the air source heat pump heating, hot water supply and drying process and the defrosting efficiency by combining the solar photovoltaic-photothermal technology.

[0006] The present application provides a solar photovoltaic-photothermal coupled air source heat pump defrosting system, comprising: a solar photovoltaic panel, a solar photothermal assembly, an air source heat pump unit and a controller, the solar photovoltaic panel and the solar photothermal assembly are connected to the air source heat pump unit respectively, the solar photothermal assembly comprises a heat generating subassembly and a heat storage water tank, the heat generating subassembly is connected to the heat storage water tank, the heat storage water tank is connected to the air source heat pump unit through a first pipeline, a first electromagnetic valve is arranged on the first pipeline, a water temperature detector is arranged in the heat storage water tank, and the controller is connected to the first electromagnetic valve, the water temperature detector and the air source heat pump unit respectively; wherein:

[0007] The solar photovoltaic panel is used for generating electricity to drive the air source heat pump machine;

[0008] The heat generating subassembly is used for recycling target solar energy when the solar photovoltaic panel generates electricity and converting the target solar energy into target heat energy;

[0009] The heat storage water tank is used for storing the target heat energy generated by the heat generating subassembly in water;

[0010] The water temperature detector is used for monitoring the water temperature in the heat storage water tank and sending the water temperature to the controller;

[0011] The controller is used for controlling to open the first electromagnetic valve based on the water temperature and the defrosting signal output by the air source heat pump unit;

[0012] The air source heat pump unit is used for taking heat from the heat storage water tank to defrost when the first electromagnetic valve is opened.

[0013] According to the solar photovoltaic light heat coupling air source heat pump defrosting system provided by the application, the heat pipe is connected with the circulating water pump, and the circulating water pump is connected with the heat storage water tank.

[0014] The heat pipe recycles target solar energy when the solar photovoltaic panel generates electricity and converts the target solar energy into target heat energy, and the target heat energy is stored into the heat storage water tank under the action of the circulating water pump.

[0015] According to the solar photovoltaic light heat coupling air source heat pump defrosting system provided by the application, the air source heat pump unit is connected with the indoor through a second pipeline, the end of the second pipeline is provided with a second electromagnetic valve, and the controller is connected with the second electromagnetic valve.

[0016] The controller is used for controlling to open the first electromagnetic valve and close the second electromagnetic valve based on the water temperature and the defrosting signal output by the air source heat pump unit, and is used for controlling to close the first electromagnetic valve and open the second electromagnetic valve when the defrosting operation reaches the preset defrosting end condition;

[0017] The air source heat pump unit is used for taking heat from the heat storage water tank to defrost when the first electromagnetic valve is opened and the second electromagnetic valve is closed, and is used for supplying heat to the indoor when the first electromagnetic valve is closed and the second electromagnetic valve is opened.

[0018] The application further provides a solar photovoltaic light heat coupling air source heat pump defrosting method applied to the solar photovoltaic light heat coupling air source heat pump defrosting system.

[0019] Obtain the water temperature in the hot water storage tank of the solar thermal component;

[0020] Based on the water temperature and the defrost signal output by the air source heat pump unit, the air source heat pump unit is controlled to take heat from the hot water storage tank for defrosting.

[0021] According to a solar photovoltaic-thermal coupled air source heat pump defrosting method provided by the present invention, obtaining the water temperature in the hot water storage tank in the solar thermal assembly includes:

[0022] Based on the capacity of the air source heat pump unit, determine the volume of water in the hot water storage tank in the solar thermal component;

[0023] When the volume of water is placed in the hot water storage tank, the water temperature in the hot water storage tank is obtained.

[0024] According to a solar photovoltaic-thermal coupled air source heat pump defrosting method provided by the present invention, based on the water temperature and the defrost signal output by the air source heat pump unit, the air source heat pump unit is controlled to extract heat from the hot water storage tank for defrosting, comprising:

[0025] When it is determined that the water temperature is greater than the preset water temperature threshold, based on the defrost signal output by the air source heat pump unit, the first solenoid valve connecting the solar thermal component and the air source heat pump unit is controlled to open and the second solenoid valve connecting the air source heat pump unit and the indoor room is closed.

[0026] According to a solar photovoltaic-thermal coupled air source heat pump defrosting method provided by the present invention, after controlling the air source heat pump unit to extract heat from the hot water storage tank for defrosting, the method further comprises:

[0027] When it is determined that the water temperature in the heat storage tank is less than or equal to a preset water temperature threshold, the first solenoid valve connecting the solar thermal component and the air source heat pump unit is controlled to close and the second solenoid valve connecting the air source heat pump unit and the indoor space is opened.

[0028] According to a solar photovoltaic-thermal coupled air source heat pump defrosting method provided by the present invention, after controlling the air source heat pump unit to extract heat from the hot water storage tank for defrosting, the method further comprises:

[0029] When it is determined that the defrost operation reaches the preset defrost end condition, the first solenoid valve connecting the solar thermal component and the air source heat pump unit is controlled to close and the second solenoid valve connecting the air source heat pump unit and the indoor unit is opened.

[0030] The present invention also provides a solar photovoltaic and thermal coupled air source heat pump defrosting device, comprising:

[0031] An acquisition module is configured to acquire a water temperature in a heat storage water tank in a solar photovoltaic-thermal coupling air source heat pump system;

[0032] A defrosting module is configured to control the air source heat pump unit to take heat from the heat storage water tank for defrosting based on the water temperature and a defrosting signal output by the air source heat pump unit.

[0033] The application further provides an electronic device, which comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the solar photovoltaic-thermal coupling air source heat pump defrosting method when executing the program.

[0034] The application further provides a non-transitory computer readable storage medium, which stores a computer program, and the computer program implements the solar photovoltaic-thermal coupling air source heat pump defrosting method when executed by a processor.

[0035] The solar photovoltaic-thermal coupling air source heat pump defrosting system and method provided by the application, wherein the solar photovoltaic-thermal coupling air source heat pump defrosting method first acquires a water temperature in a heat storage water tank in a solar photovoltaic-thermal coupling air source heat pump system, and then controls the air source heat pump unit to take heat from the heat storage water tank for defrosting based on the water temperature and a defrosting signal output by the air source heat pump unit. In this way, the heat storage of the photothermal is used to provide heat for the defrosting of the air source heat pump unit, so that the influence of the defrosting process of the air source heat pump unit on the heating, hot water supply and drying process is avoided, the stability of the whole process of the air source heat pump unit for heating, hot water supply and drying is improved, the defrosting efficiency of the air source heat pump unit is effectively improved, the utilization rate of renewable energy is effectively improved, and the practicability is high. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0037] Figure 1 FIG. 1 is a structural schematic diagram of the solar photovoltaic-thermal coupling air source heat pump defrosting system provided by the application;

[0038] Figure 2 FIG. 2 is a flow schematic diagram of the solar photovoltaic-thermal coupling air source heat pump defrosting method provided by the application;

[0039] Figure 3 FIG. 3 is a general flow schematic diagram of the solar photovoltaic-thermal coupling air source heat pump defrosting method provided by the application;

[0040] Figure 4 is a structural schematic diagram of a solar photovoltaic and photo-thermal coupled air source heat pump defrosting device provided by the present application.

[0041] Figure 5 is a structural schematic diagram of an electronic device provided by the present application.

[0042] Reference signs:

[0043] 110: solar photovoltaic panel; 120: heat pipe; 130: heat storage water tank;

[0044] 140: electromagnetic valve; 150: electromagnetic valve; 160: water temperature detector;

[0045] 170: circulating water pump; 180: electromagnetic valve; 190: electromagnetic valve;

[0046] 1100: compressor; 1110: outdoor heat exchanger; 1120: outdoor fan;

[0047] 1130: main path expansion valve; 1140: auxiliary path expansion valve; 1150: shell and tube heat exchanger;

[0048] 1160: economizer; 1170: circulating water pump; 1180: four-way reversing valve. DETAILED DESCRIPTION

[0049] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are some 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.

[0050] Developing renewable energy-based low-carbon energy is the only way to achieve sustainable energy development. Solar photovoltaic and photo-thermal technology and air source heat pump technology, as energy-saving technologies that have attracted worldwide attention in recent years, have been widely used in the construction industry, industry, agriculture and other fields in China, meeting the demand for heating, hot water and drying, and can replace traditional heating forms such as coal, effectively reducing energy consumption and carbon emissions, and having broad application space and value.

[0051] Solar photovoltaic thermal systems primarily consist of two components: a photovoltaic unit and a solar thermal unit. The solar thermal unit cools the solar cells, improving photoelectric conversion efficiency while also storing excess heat to meet domestic hot water and heating needs. However, due to regional variations in solar energy resources across my country, the stability of this solar photovoltaic thermal system for heating, hot water, and drying is poor. Furthermore, air-source heat pumps are susceptible to frost during heating, hot water, and drying, particularly at night. Furthermore, reverse defrosting can cause fluctuations in heating, hot water, and drying temperatures.

[0052] Therefore, based on the key issues of the above solar photovoltaic thermal system and air source heat pump, in order to maximize the application of renewable resources and improve the stability of air source heat pump heating, hot water supply and drying, the present invention provides a solar photovoltaic thermal coupled air source heat pump defrosting system and defrosting method. Figure 1-Figure 5 The present invention describes a solar photovoltaic and thermal coupled air source heat pump defrosting system and a defrosting method.

[0053] Reference Figure 1 , is a structural diagram of the solar photovoltaic thermal coupled air source heat pump defrosting system provided by the present invention, such as Figure 1 As shown, the solar photovoltaic thermal coupled air source heat pump defrosting system 100 includes: a solar photovoltaic panel 110, a solar thermal component ( Figure 1 Not shown), air source heat pump unit ( Figure 1 Not shown) and the controller ( Figure 1 (not shown), the solar photovoltaic panel 110 and the solar thermal component constitute a solar photovoltaic thermal unit, and the solar photovoltaic panel 110 and the solar thermal component are respectively connected to the air source heat pump unit, the solar thermal component includes a heat generating subassembly and a hot water storage tank 130, the heat generating subassembly is connected to the hot water storage tank 130, the hot water storage tank 130 is connected to the air source heat pump unit through a first pipe, a first solenoid valve is provided on the first pipe, the first solenoid valve can be a solenoid valve 140 and a solenoid valve 150, the first pipe can include a pipe where the solenoid valve 140 is located and a pipe where the solenoid valve 150 is located; a water temperature detector 160 is provided in the hot water storage tank 130, and a controller is respectively connected to the solenoid valve 140, the solenoid valve 150, the water temperature detector 160 and the air source heat pump unit; wherein:

[0054] Solar photovoltaic panels 110 are used to generate electricity to drive air source heat pumps; for example, Figure 1 As shown, the direct current (DC) generated by the solar photovoltaic panel 110 drives the air source heat pump unit to operate. However, when the direct current (DC) power generation is insufficient, the alternating current (AC) from the city grid can be inverted into direct current (DC) to drive the air source heat pump unit.

[0055] A heat production subassembly is used to recover target solar energy when the solar photovoltaic panel 110 generates electricity and convert the target solar energy into target heat energy; since the direct current generated when the sunlight shines on the solar photovoltaic panel 110 is used as the power supply, this is photovoltaic power generation, and part of the solar energy will be converted into direct current through photovoltaic conversion, and the other part of the solar energy will be recovered as heat energy to be utilized, so the target solar energy here can be the excess solar energy recovered at the same time of photovoltaic power generation.

[0056] A heat storage water tank 130 is used to store the target heat energy generated by the heat production subassembly in water;

[0057] A water temperature detector 160 is used to monitor the water temperature in the heat storage water tank 130 and send the water temperature to the controller; for example, the water temperature detector 160 can be at least one temperature sensor and is arranged at a corresponding temperature monitoring point position in the heat storage water tank 130;

[0058] A controller is used to control the opening of the electromagnetic valve 140 and the electromagnetic valve 150 based on the water temperature in the heat storage water tank 130 and the defrost signal output by the air source heat pump unit;

[0059] An air source heat pump unit is used to take heat from the heat storage water tank 130 for defrosting when the electromagnetic valve 140 and the electromagnetic valve 150 are both opened.

[0060] Optionally, the heat production subassembly includes a heat pipe 120 and a circulating water pump 170, the heat pipe 120 is connected with the circulating water pump 170, and the circulating water pump 170 is connected with the heat storage water tank 130, wherein:

[0061] The heat pipe 120 recovers the target solar energy when the solar photovoltaic panel 110 generates electricity and converts the target solar energy into target heat energy, and the target heat energy is stored in the heat storage water tank 130 under the action of the circulating water pump 170. Here, the number of heat pipes 120 can be multiple and arranged in an array on the solar photovoltaic panel 110, so that the solar heat assembly stores the target heat energy in the heat storage water tank 130 by using the heat circulation mechanism to convert the target solar energy into the target heat energy through the array heat pipe.

[0062] Optionally, the air source heat pump unit is connected with the indoor through a second pipeline, the end of the second pipeline is provided with a second electromagnetic valve, the second electromagnetic valve can be an electromagnetic valve 180 and an electromagnetic valve 190, and the second pipeline can include a pipeline where the electromagnetic valve 180 is located and a pipeline where the electromagnetic valve 190 is located; the controller is connected with the electromagnetic valve 180 and the electromagnetic valve 190; as Figure 1 shown, the electromagnetic valve 180 and the electromagnetic valve 190 are also respectively connected with a heat supply end, so that the heat supply to the indoor can continue after the defrosting operation is completed, so as to continue to meet the needs of heating, hot water supply, drying and the like.

[0063] The controller is configured to control opening of the electromagnetic valve 140 and the electromagnetic valve 150 and closing of the electromagnetic valve 180 and the electromagnetic valve 190 based on the water temperature and a defrost signal output by the air source heat pump unit, and to control closing of the electromagnetic valve 140 and the electromagnetic valve 150 and opening of the electromagnetic valve 180 and the electromagnetic valve 190 when the defrost operation reaches a preset defrost end condition.

[0064] The air source heat pump unit is configured to take heat from the heat storage water tank 130 for defrosting when the electromagnetic valve 140 and the electromagnetic valve 150 are both open and the electromagnetic valve 180 and the electromagnetic valve 190 are both closed, and to supply heat to the indoor for heating when the electromagnetic valve 140 and the electromagnetic valve 150 are both closed and the electromagnetic valve 180 and the electromagnetic valve 190 are both open.

[0065] It should be noted that the air source heat pump unit includes a compressor 1100, an outdoor heat exchanger 1110, an outdoor fan 1120, a main path expansion valve 1130, an auxiliary path expansion valve 1140, a shell-and-tube heat exchanger 1150, an economizer 1160, a circulating water pump 1170, a four-way reversing valve 1180, an electromagnetic valve 180, and an electromagnetic valve 190, and the working principle thereof includes that the compressor 1100 works to generate high-temperature and high-pressure refrigerant, the refrigerant is sent to the shell-and-tube heat exchanger 1150 via the four-way reversing valve 1180 to achieve the purpose of transferring heat to the water loop, further, the refrigerant reaching the shell-and-tube heat exchanger 1150 is divided into two paths, one path of the refrigerant is throttled by the auxiliary path expansion valve 1140 and then sent to the gas supplement port of the compressor 1100 after heat exchange with another path of the refrigerant in the economizer 1160 to achieve the purpose of gas supplement, and the other path of the refrigerant is throttled by the main path expansion valve 1130 and then enters the outdoor heat exchanger 1110, and after convective heat exchange by the outdoor fan 1120, the other path of the refrigerant absorbs outdoor air heat and evaporates into gaseous refrigerant, the gaseous refrigerant flows through the four-way reversing valve 1180 along the refrigerant pipeline and then enters the suction port of the compressor 1110, and the heat in the outdoor air is finally transferred to the water in the heat storage water tank 130 by the working mode of the compressor 1110.

[0066] Optionally, as shown in Figure 1 It should be noted that the air source heat pump unit includes a compressor 1100, an outdoor heat exchanger 1110, an outdoor fan 1120, a main path expansion valve 1130, an auxiliary path expansion valve 1140, a shell-and-tube heat exchanger 1150, an economizer 1160, a circulating water pump 1170, a four-way reversing valve 1180, an electromagnetic valve 180, and an electromagnetic valve 190, and the working principle thereof includes that the compressor 1100 works to generate high-temperature and high-pressure refrigerant, the refrigerant is sent to the shell-and-tube heat exchanger 1150 via the four-way reversing valve 1180 to achieve the purpose of transferring heat to the water loop, further, the refrigerant reaching the shell-and-tube heat exchanger 1150 is divided into two paths, one path of the refrigerant is throttled by the auxiliary path expansion valve 1140 and then sent to the gas supplement port of the compressor 1100 after heat exchange with another path of the refrigerant in the economizer 1160 to achieve the purpose of gas supplement, and the other path of the refrigerant is throttled by the main path expansion valve 1130 and then enters the outdoor heat exchanger 1110, and after convective heat exchange by the outdoor fan 1120, the other path of the refrigerant absorbs outdoor air heat and evaporates into gaseous refrigerant, the gaseous refrigerant flows through the four-way reversing valve 1180 along the refrigerant pipeline and then enters the suction port of the compressor 1110, and the heat in the outdoor air is finally transferred to the water in the heat storage water tank 130 by the working mode of the compressor 1110.

[0067] It should be noted that the specific functions of the solar photovoltaic-thermal coupled air source heat pump defrosting system can be mutually checked with the following solar photovoltaic-thermal coupled air source heat pump defrosting method embodiments. Moreover, the execution subject of the following method embodiments can be the controller in the above-mentioned solar photovoltaic-thermal coupled air source heat pump defrosting system. That is, the following method embodiments are described by taking the execution subject as the controller as an example.

[0068] Figure 2 An example of a flowchart of a solar photovoltaic-thermal coupled air source heat pump defrosting method is shown in Figure 2 As shown in the figure, the solar photovoltaic-thermal coupled air source heat pump defrosting method comprises the following steps:

[0069] Step 210, obtaining the water temperature in the heat storage water tank in the solar photovoltaic-thermal assembly.

[0070] Specifically, when the solar photovoltaic panel 110 drives the air source heat pump unit to operate, and the heat generation subassembly of the solar photovoltaic-thermal assembly converts the recovered excess solar energy into target heat energy, the target heat energy enters the heat storage water tank 130 under the action of the circulating water pump 170, thereby increasing the temperature of the water in the heat storage water tank 130. In this process, the water temperature detector 160 in the heat storage water tank 130 can detect the temperature of the water in real time and send the detected water temperature to the controller in real time.

[0071] Step 220, based on the water temperature and the defrosting signal output by the air source heat pump unit, controlling the air source heat pump unit to take heat from the heat storage water tank for defrosting.

[0072] Specifically, while the controller receives the water temperature sent by the water temperature detector 160 in real time, it also monitors whether the air source heat pump unit outputs a defrosting signal. When the controller monitors that the air source heat pump unit outputs a defrosting signal, it can control the air source heat pump unit to take heat from the heat storage water tank for defrosting based on the water temperature in the heat storage water tank 130. That is, the air source heat pump unit defrosting at this time takes heat from the heat storage water tank 130.

[0073] It should be noted that the air source heat pump unit can be pre-set with conditions for entering the defrosting mode, which can include but is not limited to the temperature of the discharge pipe falling to the lowest temperature value, the outdoor environment temperature being lower than the pre-set temperature value, the air pressure difference between the inlet and outlet of the finned tube disc air side being greater than the pre-set air pressure difference, and the high and low pressure ratio of the compressor not satisfying the pre-set ratio. When the air source heat pump unit satisfies the above-mentioned pre-set conditions, it can spontaneously trigger the generation of a defrosting signal, thereby entering the defrosting mode.

[0074] The solar photovoltaic-thermal coupled air-source heat pump defrosting method provided by the present invention first obtains the water temperature in the hot water storage tank of the solar thermal assembly. Then, based on the water temperature and the defrost signal output by the air-source heat pump unit, the air-source heat pump unit is controlled to draw heat from the hot water storage tank for defrosting. This method utilizes the stored heat of solar thermal to provide heat for defrosting the air-source heat pump unit, preventing the defrosting process of the air-source heat pump unit from affecting the heating, hot water supply, and drying processes. This method not only improves the stability of the heating, hot water supply, and drying processes of the air-source heat pump unit, but also effectively increases the defrosting efficiency of the air-source heat pump unit. It also effectively increases the utilization rate of renewable energy, and is highly practical.

[0075] Optionally, the specific implementation process of step 210 may include:

[0076] First, based on the capacity of the air source heat pump unit, the volume of water in the hot water storage tank of the solar thermal component is determined; then, when the volume of water is placed in the hot water storage tank, the water temperature in the hot water storage tank is obtained.

[0077] Specifically, the controller can first estimate the heat Qf required for defrosting the air source heat pump unit based on the capacity of the air source heat pump unit, and then further determine the volume V of water in the hot water storage tank 130, that is, the capacity of the hot water storage tank 130, based on the required heat Qf.

[0078] It should be noted that, in order to ensure the stability and reliability of the defrosting operation, the water volume V and the required heat Qf are designed here considering the most unfavorable frosting situation of the air source heat pump unit. That is, when estimating the heat Qf required for defrosting the air source heat pump unit, the estimation is made according to the most unfavorable frosting situation of the air source heat pump unit. For example, 30% of the maximum capacity of the air source heat pump unit is determined as the heat Qf required for defrosting the air source heat pump unit. It can be seen from this that when the capacity of the air source heat pump unit is larger, the heat Qf required for defrosting is also greater. Further, when the heat Qf required for defrosting is determined, the controller can calculate the volume V of the water in the hot water storage tank 130 based on formula (1), and when it is determined that the volume of water contained in the hot water storage tank 130 reaches V, the controller can receive the water temperature detected by the water temperature detector 160 in the hot water storage tank 130 in real time.

[0079]

[0080] In formula (1), c is the specific heat capacity of water and its value is 4.2×10 3 J / (kg·℃); ρ is the density of water and its value is 1g / cm 3 , Th is the maximum temperature of the water in the hot water storage tank 130.

[0081] The solar photovoltaic-photothermal coupled air source heat pump defrosting method provided by the application, the controller determines the volume of water in the heat storage water tank based on the capacity of the air source heat pump unit, and determines that the volume of water is placed in the heat storage water tank, and the water temperature in the heat storage water tank is obtained, so that the required amount of water in the heat storage water tank is determined in combination with the capacity of the air source heat pump unit, thereby ensuring the accuracy and reliability of the defrosting operation, and laying a foundation for subsequent improvement of the defrosting efficiency.

[0082] Optionally, the specific implementation process of step 220 can include:

[0083] When it is determined that the water temperature is greater than the preset water temperature threshold, the defrosting signal output by the air source heat pump unit is used to control the first electromagnetic valve connected between the solar photothermal component and the air source heat pump unit to be opened and the second electromagnetic valve connected between the air source heat pump unit and the indoor to be closed.

[0084] The preset water temperature threshold is used to represent that the heat in the heat storage water tank 130 is too low and insufficient for defrosting, for example, the preset water temperature threshold can be 5℃; and the defrosting signal is used to represent that the air source heat pump unit enters the defrosting mode.

[0085] Specifically, during the operation of the solar photovoltaic panel 110, the solar photothermal component and the air source heat pump unit, the controller can receive the water temperature in the heat storage water tank 130 in real time when the volume of water in the heat storage water tank 130 reaches V, and can judge the received water temperature and the preset water temperature threshold. When it is determined that the received water temperature is greater than the preset water temperature threshold, it can be considered that the water temperature in the heat storage water tank 130 is sufficient for defrosting, and at this time the controller can control the electromagnetic valve 140 and the electromagnetic valve 150 connected between the solar photothermal component and the air source heat pump unit to be opened and the electromagnetic valve 180 and the electromagnetic valve 190 connected between the air source heat pump unit and the indoor to be closed based on the defrosting signal output by the air source heat pump unit, so that the air source heat pump unit takes heat from the heat storage water tank 130 for defrosting.

[0086] The solar photovoltaic-photothermal coupled air source heat pump defrosting method provided by the application, the controller monitors that the water temperature in the heat storage water tank is greater than the preset water temperature threshold, and controls the air source heat pump unit to take heat from the heat storage water tank, so that the solar photovoltaic panel can provide power generation efficiency, and the air source heat pump unit can also provide a stable heat source for defrosting, thereby improving the efficiency of the air source heat pump unit for defrosting.

[0087] Optionally, after step 210, the method can further include:

[0088] When it is determined that the water temperature in the heat storage water tank is less than or equal to the preset water temperature threshold, the first electromagnetic valve connected between the solar photothermal component and the air source heat pump unit is controlled to be closed and the second electromagnetic valve connected between the air source heat pump unit and the indoor is controlled to be opened.

[0089] Specifically, since the air source heat pump unit can only take heat from the heat storage water tank 130 for defrosting when the water temperature in the heat storage water tank 130 is greater than the preset water temperature threshold, in order to ensure that the water temperature in the heat storage water tank 130 can be normally used for defrosting, the controller can also continue to receive the water temperature in the heat storage water tank 130 in real time and judge with the preset water temperature threshold during the process of the air source heat pump unit taking heat from the heat storage water tank 130 for defrosting. If it is determined that the received water temperature is less than or equal to the preset water temperature threshold, it means that the heat in the heat storage water tank 130 is not enough and the temperature is too low at this time, and if the heat continues to be taken, it will cause icing, so the heat cannot be taken from the heat storage water tank 130. Based on this, the controller can control to close the electromagnetic valve 140 and the electromagnetic valve 150 connected between the solar photothermal component and the air source heat pump unit, and open the electromagnetic valve 180 and the electromagnetic valve 190 connected between the air source heat pump unit and the indoor, so that the air source heat pump unit continues to take heat from the indoor for defrosting, thereby ensuring the stability and continuity of the entire defrosting operation process.

[0090] It should be noted that during the process of the air source heat pump unit taking heat from the heat storage water tank 130, although continuous heat taking will cause the water temperature in the heat storage water tank 130 to decrease until it is less than or equal to the preset water temperature threshold, and the solar photovoltaic panel, the solar photovoltaic component or the heat storage water tank 130 fails, or encounters an extreme frosting working condition, which will also cause the water temperature in the heat storage water tank 130 to be less than or equal to the preset water temperature threshold. Therefore, in order to ensure the smooth execution of the defrosting operation, the defrosting operation can be continued until the defrosting ends by combining the heat taking from the indoor.

[0091] The solar photovoltaic-photothermal coupled air source heat pump unit defrosting method provided by the application, when the controller monitors that the water temperature in the heat storage water tank is less than or equal to the preset water temperature threshold during the process of the air source heat pump unit taking heat from the heat storage water tank for defrosting, the air source heat pump unit is controlled to take heat from the indoor to continue to complete the defrosting operation. In this way, by combining the solar photothermal heat storage and indoor heat taking, the reliable stability and flexible efficiency of the entire air source heat pump unit heating process are effectively ensured, thereby further improving the efficiency of the air source heat pump unit defrosting.

[0092] Optionally, after step 220, the method further comprises:

[0093] When it is determined that the defrosting operation reaches the preset defrosting end condition, the first electromagnetic valve connected between the solar photothermal component and the air source heat pump unit is controlled to be closed, and the second electromagnetic valve connected between the air source heat pump unit and the indoor is opened.

[0094] Specifically, during the defrost operation of the air source heat pump, the controller can also monitor whether the defrost operation reaches the preset defrost operation end conditions. The defrost operation end conditions may include but are not limited to the set defrost time, the exhaust pipe temperature rises to the first preset temperature maximum value, and the exhaust pipe temperature of the outdoor heat exchanger 190 rises to the second preset temperature maximum value. For example, when the cumulative defrost time of the air source heat pump unit reaches the set defrost time, the defrost operation end instruction can be automatically triggered. At this time, based on the defrost operation end instruction, the controller controls the closing of the solenoid valve 140 and the solenoid valve 150 connecting the solar thermal component and the air source heat pump unit and the opening of the solenoid valve 180 and the solenoid valve 190 connecting the air source heat pump unit and the indoor room, so that the indoor room continues to be stably supplied with heat after the defrost operation is completed.

[0095] It should be noted that during the entire defrost process of the air-source heat pump unit, if the water temperature in the hot water storage tank 130 remains above the preset water temperature threshold, the heat required for the entire defrost process will be derived entirely from the hot water storage tank 130. In this case, when the defrost operation reaches the preset defrost termination condition, the controller will control the closing of solenoid valves 140 and 150 and the opening of solenoid valves 180 and 190, allowing the air-source heat pump unit to continue supplying heat after the defrost is completed, thereby achieving the goal of undisturbed indoor temperature during the defrost process. If the water temperature in the hot water storage tank 130 is initially above the preset water temperature threshold, as the air-source heat pump unit continues to draw heat, the heat collection from the hot water storage tank 130 may be terminated and replaced by heat collection from the indoor room. In other words, the heat required for the entire defrost process comes from both the hot water storage tank 130 and the indoor room. This ensures the continuity and stability of the entire defrost process.

[0096] The solar photovoltaic-thermal coupled air source heat pump defrosting method provided by the present invention, when the controller determines that the defrosting operation has reached the preset defrosting end condition, controls the end of the defrosting operation and continues to supply heat to the room, thereby effectively solving the problem of the air source heat pump unit lowering the indoor temperature during defrosting, and improving the stability of the entire defrosting and heating process of the air source heat pump unit, thereby also improving the reliability and stability of the entire solar photovoltaic-thermal coupled air source heat pump defrosting system.

[0097] Reference Figure 3 , which is the overall flow chart of the solar photovoltaic thermal coupled air source heat pump defrosting method provided by the present invention, such as Figure 3 As shown, the solar photovoltaic thermal coupled air source heat pump defrosting method includes the following steps:

[0098] Step 310 : The controller obtains the water temperature Ts in the hot water storage tank 130 in real time through the water temperature detector 160 .

[0099] Step 320, when determining that the water temperature Ts is greater than the preset temperature threshold Tset, based on the defrost signal output by the air source heat pump coupled unit, control to open the electromagnetic valve 140 and the electromagnetic valve 150 and close the electromagnetic valve 180 and the electromagnetic valve 190.

[0100] Step 330, during the defrosting process, continue to obtain the water temperature Ts' in the heat storage water tank.

[0101] Step 340, determine whether the water temperature Ts' is greater than the preset temperature threshold Tset, if it is determined that the water temperature Ts' is still greater than the preset temperature threshold Tset, enter step 350; otherwise, if it is determined that the water temperature Ts' is less than or equal to the preset temperature threshold Tset, enter step 360.

[0102] Step 350, continue to control to open the electromagnetic valve 140 and the electromagnetic valve 150 and close the electromagnetic valve 180 and the electromagnetic valve 190, and enter step 370.

[0103] Step 360, control to close the electromagnetic valve 140 and the electromagnetic valve 150 and open the electromagnetic valve 180 and the electromagnetic valve 190 until it is determined that the defrosting operation reaches the preset defrosting end condition, and enter step 380.

[0104] Step 370, when it is determined that the defrosting operation reaches the preset defrosting end condition, control to close the electromagnetic valve 140 and the electromagnetic valve 150 and open the electromagnetic valve 180 and the electromagnetic valve 190, and enter step 380.

[0105] Step 380, continue to provide a stable heat source to the indoor by taking heat, and enter step 390.

[0106] Step 390, when receiving a heating end instruction, end the heating operation.

[0107] Step 340, when determining that the water temperature Ts' is less than or equal to the preset temperature threshold Tset, control to close the electromagnetic valve 140 and the electromagnetic valve 150 and open the electromagnetic valve 180 and the electromagnetic valve 190.

[0108] Step 340, when determining that the defrosting operation reaches the preset defrosting end condition, control to open the electromagnetic valve 140 and the electromagnetic valve 150 and close the electromagnetic valve 180 and the electromagnetic valve 190.

[0109] The application provides a defrosting method of a solar photovoltaic-thermal coupled air source heat pump, which is based on the water temperature in a heat storage water tank and a defrosting signal output by an air source heat pump unit to control the air source heat pump unit to take heat from the heat storage water tank for defrosting, and based on the water temperature in the heat storage water tank and a preset water temperature threshold value to determine whether to continue taking heat from the heat storage water tank for defrosting or to take heat from indoors for defrosting during the defrosting process, so as to provide heat for the defrosting of the air source heat pump unit by using the photothermal heat storage and indoor heat source, avoid the influence of the defrosting process of the air source heat pump unit on the heating, hot water supply and drying process, improve the stability of the whole process of the air source heat pump unit for heating, hot water supply and drying, and effectively improve the defrosting efficiency of the air source heat pump unit.

[0110] The solar photovoltaic-thermal coupled air source heat pump defrosting device provided by the application is described below, and the solar photovoltaic-thermal coupled air source heat pump defrosting device described below can be correspondingly referred to the solar photovoltaic-thermal coupled air source heat pump defrosting method described above.

[0111] Reference Figure 4 The structure diagram of the solar photovoltaic-thermal coupled air source heat pump defrosting device provided by the application is shown in the figure. Figure 4 The solar photovoltaic-thermal coupled air source heat pump defrosting device 400 comprises:

[0112] The obtaining module 410 is used to obtain the water temperature in the heat storage water tank of the solar photothermal assembly.

[0113] The defrosting module 420 is used to control the air source heat pump unit to take heat from the heat storage water tank for defrosting based on the water temperature and the defrosting signal output by the air source heat pump unit.

[0114] Optionally, the obtaining module 410 can be specifically used to determine the volume of water in the heat storage water tank of the solar photothermal assembly based on the capacity of the air source heat pump unit, and obtain the water temperature in the heat storage water tank in the case that the volume of water is placed in the heat storage water tank.

[0115] Optionally, the defrosting module 420 can be specifically used to control the first electromagnetic valve connected between the solar photothermal assembly and the air source heat pump unit to be opened and the second electromagnetic valve connected between the air source heat pump unit and indoors to be closed based on the defrosting signal output by the air source heat pump unit when the water temperature is greater than the preset water temperature threshold value.

[0116] Optionally, the defrosting module 420 can be further configured to control the first electromagnetic valve connected between the solar photothermal assembly and the air source heat pump unit to be closed and the second electromagnetic valve connected between the air source heat pump unit and the indoor unit to be opened when the water temperature in the heat storage water tank is less than or equal to the preset water temperature threshold.

[0117] Optionally, the device further comprises a heating module configured to control the first electromagnetic valve connected between the solar photothermal assembly and the air source heat pump unit to be closed and the second electromagnetic valve connected between the air source heat pump unit and the indoor unit to be opened when the defrosting operation reaches the preset defrosting end condition.

[0118] Figure 5 An example of a schematic diagram of the physical structure of an electronic device is shown in FIG. 5. Figure 5 As shown in FIG. 5, the electronic device 500 can include a processor 510, a communications interface 520, a memory 530, and a communications bus 540. The processor 510, the communications interface 520, and the memory 530 can communicate with each other via the communications bus 540. The processor 510 can invoke the logical instructions in the memory 530 to execute the solar photovoltaic-photothermal coupled air source heat pump defrosting method, which includes the following steps:

[0119] Obtaining the water temperature in the heat storage water tank of the solar photothermal assembly;

[0120] Based on the water temperature and the defrosting signal output by the air source heat pump unit, controlling the air source heat pump unit to take heat from the heat storage water tank for defrosting.

[0121] In addition, the logical instructions in the memory 530 described above can be implemented in the form of a software functional unit and sold or used as an independent product. Based on this understanding, the technical solutions of the present application, in essence, or the parts that contribute to the prior art, or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the various embodiments of the present application. The aforementioned storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0122] In yet another aspect, the present application also provides a non-transitory computer readable storage medium having stored thereon a computer program, which, when executed by a processor, implements the solar photovoltaic-thermal coupled air source heat pump defrosting method provided by the above method, the method comprising:

[0123] obtaining a water temperature in a heat storage water tank in a solar photothermal assembly;

[0124] controlling the air source heat pump unit to take heat from the heat storage water tank for defrosting based on the water temperature and a defrosting signal output by the air source heat pump unit.

[0125] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, i.e., can be located in one place or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment scheme according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0126] From the above description of the embodiments, those skilled in the art can clearly understand that the embodiments can be realized by means of software plus the necessary general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions, essentially or in other words, the part that contributes to the prior art, can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0127] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A solar photovoltaic and thermal coupled air source heat pump defrosting system, characterized in that: include: A solar photovoltaic panel, a solar thermal component, an air source heat pump unit and a controller, wherein the solar photovoltaic panel and the solar thermal component are respectively connected to the air source heat pump unit, the solar thermal component includes a heat generating subassembly and a hot water storage tank, the heat generating subassembly is connected to the hot water storage tank, and the hot water storage tank is connected to the air source heat pump unit via a first pipe, the first pipe is provided with a first solenoid valve, the hot water storage tank is provided with a water temperature detector, and the controller is respectively connected to the first solenoid valve, the water temperature detector and the air source heat pump unit; wherein: The solar photovoltaic panel is used to generate electricity to drive the air source heat pump; The heat generating subassembly is used to recover target solar energy when the solar photovoltaic panel generates electricity, and convert the target solar energy into target thermal energy; the heat generating subassembly includes a heat pipe and a circulating water pump, the heat pipe is connected to the circulating water pump, and the circulating water pump is connected to the hot water storage tank; wherein: the heat pipe recovers the target solar energy when the solar photovoltaic panel generates electricity, and converts the target solar energy into target thermal energy, and the target thermal energy is stored in the hot water storage tank under the action of the circulating water pump; The heat storage tank is used to store the target heat energy generated by the heat generating subassembly in water; The water temperature detector is used to monitor the water temperature in the hot water storage tank and send the water temperature to the controller; The controller is configured to control the opening of the first solenoid valve based on the water temperature and the defrost signal output by the air source heat pump unit; The air source heat pump unit is used to take heat from the hot water storage tank for defrosting when the first solenoid valve is opened; the air source heat pump unit is connected to the indoor room through a second pipe, a second solenoid valve is provided at the end of the second pipe, and the controller is connected to the second solenoid valve; the controller is used to control the opening of the first solenoid valve and the closing of the second solenoid valve based on the water temperature and the defrost signal output by the air source heat pump unit; and is used to control the closing of the first solenoid valve and the opening of the second solenoid valve when it is determined that the defrost operation reaches a preset defrost end condition; the air source heat pump unit is used to take heat from the hot water storage tank for defrosting when the first solenoid valve is opened and the second solenoid valve is closed; and is used to provide heating to the indoor room when the first solenoid valve is closed and the second solenoid valve is opened.

2. A solar photovoltaic and thermal coupled air source heat pump defrosting method, characterized in that: The solar photovoltaic-thermal coupled air source heat pump defrosting system according to claim 1 comprises: Obtain the water temperature in the hot water storage tank of the solar thermal component; Based on the water temperature and the defrost signal output by the air source heat pump unit, the air source heat pump unit is controlled to take heat from the hot water storage tank for defrosting.

3. The solar photovoltaic-thermal coupled air source heat pump defrosting method according to claim 2, characterized in that: The method of obtaining the water temperature in the heat storage tank of the solar thermal component includes: Determine the volume of water in the hot water storage tank of the solar thermal module based on the capacity of the air source heat pump unit; When the volume of water is placed in the hot water storage tank, the water temperature in the hot water storage tank is obtained.

4. The solar photovoltaic-thermal coupled air source heat pump defrosting method according to claim 2, characterized in that: The step of controlling the air source heat pump unit to extract heat from the hot water tank for defrosting based on the water temperature and the defrost signal output by the air source heat pump unit comprises: When it is determined that the water temperature is greater than the preset water temperature threshold, based on the defrost signal output by the air source heat pump unit, the first solenoid valve connecting the solar thermal component and the air source heat pump unit is controlled to open and the second solenoid valve connecting the air source heat pump unit and the indoor room is closed.

5. The solar photovoltaic-thermal coupled air source heat pump defrosting method according to claim 2, characterized in that: After controlling the air source heat pump unit to extract heat from the hot water storage tank for defrosting, the method further includes: When it is determined that the water temperature in the heat storage tank is less than or equal to a preset water temperature threshold, the first solenoid valve connecting the solar thermal component and the air source heat pump unit is controlled to close and the second solenoid valve connecting the air source heat pump unit and the indoor space is opened.

6. The solar photovoltaic-thermal coupled air source heat pump defrosting method according to claim 2, characterized in that: After controlling the air source heat pump unit to extract heat from the hot water storage tank for defrosting, the method further includes: When it is determined that the defrost operation reaches the preset defrost end condition, the first solenoid valve connecting the solar thermal component and the air source heat pump unit is controlled to close and the second solenoid valve connecting the air source heat pump unit and the indoor unit is opened.

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