A coupling heat exchange system of PV / T and dual-source heat pump

Abstract

The application discloses a PV / T and double-source heat pump coupled heat exchange system, and relates to the technical field of solar energy and air energy complementary coupling. The system comprises a double-source heat pump unit, a solar heat supply unit, a user-side heat supply unit and an electric control unit, and can realize the collaborative operation of photovoltaic power generation, light heat utilization and heat pump heating and refrigeration. The application can switch the PV / T heat source and the air heat source to guarantee heating in winter, and can supply refrigeration and domestic hot water in the non-heating season. Meanwhile, the application can target to reduce the temperature of the PV / T collector to improve the photoelectric efficiency, and can store, transmit or use the electric energy generated by the PV / T collector. The application can significantly improve the COP value of the heat pump and the power generation efficiency of the PV / T collector, and improve the overall conversion and use efficiency of solar energy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solar energy and air energy complementary coupling, in particular to a PV / T and double-source heat pump coupled heat exchange system. BACKGROUND

[0002] With the development of new energy technology, solar energy as a clean and renewable energy, its comprehensive utilization efficiency is concerned. Photovoltaic-thermal (PV / T) integrated components can simultaneously realize photovoltaic power generation and heat collection, but in practical application, the photoelectric conversion efficiency of PV / T components will decrease significantly with the increase of their temperature, how to effectively use the heat generated by PV / T components and reduce their temperature to improve the power generation efficiency has become a key problem in the industry.

[0003] The existing heat pump system mostly uses single air source or water source, the heating efficiency (COP) of air source heat pump is greatly reduced in low temperature environment, and even cannot be stable operation; water source heat pump is limited by water source conditions, and the application scene is limited. At the same time, the existing coupling system of PV / T and heat pump mostly exists the problems of inflexible heat source switching, low energy comprehensive utilization efficiency, unable to consider multiple demands of heating, refrigeration and domestic hot water, etc., and it is difficult to realize the optimal energy allocation in different seasons and different working conditions.

[0004] Therefore, it is urgent to design a heat exchange system which can realize the efficient coupling of PV / T and double-source heat pump, can flexibly switch heat source, can consider the demands of heating, refrigeration, domestic hot water supply and PV / T cooling and heat dissipation, and can improve the energy comprehensive utilization efficiency. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art, and provides a PV / T and double-source heat pump coupled heat exchange system, which realizes the collaborative operation of photovoltaic power generation, heat utilization, heat pump heating and refrigeration, improves the COP value of heat pump by flexibly switching heat source, reduces the temperature of PV / T components to improve the photoelectric conversion efficiency, considers the supply of domestic hot water, and improves the overall conversion and use efficiency of solar energy.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] A PV / T and double-source heat pump coupled heat exchange system, comprising:

[0008] The double-source heat pump unit comprises a water-side branch, an air-side branch, a heat pump main line, a first refrigeration branch, a second refrigeration branch, the fifth electromagnetic valve, the second expansion valve, the water-side evaporator / condenser, and the eighth electromagnetic valve are sequentially arranged on the water-side branch, the fourth electromagnetic valve, the first expansion valve, the air-side evaporator / condenser, and the sixth electromagnetic valve are sequentially arranged on the air-side branch, the four-way reversing valve is arranged on the heat pump main line, the seventh electromagnetic valve is arranged on the first refrigeration branch, the ninth electromagnetic valve is arranged on the second refrigeration branch, the D port of the four-way reversing valve is connected with the exhaust end of the compressor, the suction end of the compressor is connected with the S port of the four-way reversing valve, one end of the seventh electromagnetic valve is connected with the pipeline between the water-side evaporator / condenser and the eighth electromagnetic valve, and the other end of the seventh electromagnetic valve is connected with the pipeline between the first expansion valve and the fourth electromagnetic valve, one end of the ninth electromagnetic valve is connected with the E port of the four-way reversing valve, and the other end of the ninth electromagnetic valve is connected with the pipeline between the water-side evaporator / condenser and the second expansion valve, and the C port of the four-way reversing valve is connected with the sixth electromagnetic valve and the eighth electromagnetic valve.

[0009] The solar heat supply unit comprises a PV / T heat collector, a PV / T circulating pump, and a first electromagnetic valve, and the PV / T heat collector, the first electromagnetic valve, the water-side evaporator / condenser, and the PV / T circulating pump are sequentially connected in a loop.

[0010] Further, the double-source heat pump unit further comprises a heat pump heat supply branch, and the heat pump heat supply branch is sequentially provided with a heat supply side condenser / evaporator and a tenth electromagnetic valve, the heat source side inlet of the heat supply side condenser / evaporator is connected with the E port of the four-way reversing valve, and the outlet of the tenth electromagnetic valve is connected with the fourth electromagnetic valve and the fifth electromagnetic valve.

[0011] Further, the user-side heat supply unit comprises a user heat supply main line, a user heat supply branch, and an air energy water tank heating branch, the user heat supply main line is sequentially provided with a conversion water tank, a heating circulating pump, and an eleventh electromagnetic valve, the user heat supply branch is provided with a user heat supply end, the air energy water tank heating branch is provided with a twelfth electromagnetic valve, the eleventh electromagnetic valve is connected with the heat taking side inlet of the heat supply side condenser / evaporator, the heat taking side outlet of the heat supply side condenser / evaporator is connected with the user heat supply end and the twelfth electromagnetic valve, and the user heat supply end and the twelfth electromagnetic valve are connected with the inlet of the conversion water tank.

[0012] Further, the solar heat supply unit further comprises an air-cooled heat dissipation branch, and the air-cooled heat dissipation branch is sequentially provided with a PV / T heat dissipation device and a second electromagnetic valve, the second electromagnetic valve is connected with the outlet of the PV / T heat collector, and the outlet of the PV / T heat dissipation device is connected with the inlet of the PV / T circulating pump.

[0013] Further, the solar heat supply unit further comprises a solar water tank heating branch, and the solar water tank heating branch is provided with a third electromagnetic valve, the inlet of the third electromagnetic valve is connected with the outlet of the PV / T heat collector, the outlet of the third electromagnetic valve is connected with the inlet of the twelfth electromagnetic valve, and the conversion water tank and the PV / T circulating pump are further connected through a water supplement pipeline.

[0014] Further, the user side heat supply unit further comprises a domestic hot water pipeline, one end of the domestic hot water pipeline is connected with a tap water source, the other end of the domestic hot water pipeline is connected with a user domestic hot water end, a twelfth manual valve, a spiral coil and a thirteenth manual valve are sequentially arranged on the domestic hot water pipeline, and the spiral coil is arranged in the conversion water tank.

[0015] Further, the electric control unit comprises a PLC controller, a battery pack, a charging controller, a bidirectional inverter, a circuit breaker and a grid-connected inverter, the power grid is electrically connected with the PLC controller through the circuit breaker and the grid-connected inverter, the photovoltaic power generation part of the PV / T collector is connected with the battery pack through the charging controller, the battery pack is connected with the PLC controller through the bidirectional inverter, and the PLC controller is electrically connected with each electrical equipment.

[0016] Further, a first manual valve is arranged at the outlet of the PV / T collector, the outlet of the first manual valve is connected with a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve respectively, and a third manual valve is arranged between the water side evaporator / condenser and the PV / T circulating pump.

[0017] Further, a fourth manual valve is arranged on the water supplement pipeline.

[0018] Further, a fifth manual valve is arranged between the conversion water tank and the heating circulating pump, a sixth manual valve and a seventh manual valve are sequentially arranged between the twelfth electromagnetic valve and the conversion water tank, an eighth manual valve is arranged at the outlet of the heating side condenser / evaporator, a ninth manual valve is arranged between the eighth manual valve and the user heating end, a tenth manual valve is arranged at the outlet of the user heating end, the outlet of the tenth manual valve is connected with the inlet of the seventh manual valve, and an eleventh manual valve is arranged between the eighth manual valve and the twelfth electromagnetic valve.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] 1. The present application integrates photovoltaic power generation, energy storage and light heat collection and conversion functions, realizes the collaborative work and automatic switching of the water side (PV / T heat source) and the air side heat source through the double-source heat pump unit, preferentially uses the PV / T heat source with higher and more stable temperature, significantly improves the average COP value of the heat pump, and solves the problems of low efficiency and unstable operation of the single heat source heat pump under extreme working conditions.

[0021] 2. Through the coupling of the PV / T collector, the heat pump system and the heat dissipation device, the PV / T collector is cooled and dissipated in different seasons and different working conditions, the temperature of the PV / T collector is effectively reduced, the photoelectric conversion efficiency is greatly improved, the waste heat of the PV / T collector is fully utilized for heating and heating domestic hot water, and the comprehensive utilization efficiency of solar energy is improved.

[0022] 3. The system can meet the heating demand in heating season and the cooling demand in non-heating season, and ensure the stable supply of domestic hot water throughout the year, realizing "one machine with multiple uses", adapting to different user demands, and having wide application scenarios.

[0023] 4. The electric control unit realizes automatic control of the system, and realizes the storage, grid connection or self-use of electric energy in combination with the energy storage module, reduces the dependence on commercial power, and further improves the economy and flexibility of energy utilization. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structure schematic view of a PV / T and double-source heat pump coupled heat exchange system of the present application;

[0025] Figure 2 It is a control principle diagram of a PV / T and double-source heat pump coupled heat exchange system of the present application;

[0026] In the figure: 1-PV / T collector, 2-PV / T circulating pump, 3-PV / T heat dissipation device, 4-first electromagnetic valve, 5-second electromagnetic valve, 6-third electromagnetic valve, 7-first manual valve, 8-second manual valve, 9-third manual valve, 10-water side evaporator / condenser, 11-air side evaporator / condenser, 12-heating side condenser / evaporator, 13-compressor, 14-four-way reversing valve, 15-first expansion valve, 16-second expansion valve, 17-fourth electromagnetic valve, 18-fifth electromagnetic valve, 19-sixth electromagnetic valve, 20-seventh electromagnetic valve, 21-eighth electromagnetic valve, 22-ninth electromagnetic valve, 23-tenth electromagnetic valve, 24-switching water tank, 25-fourth manual valve, 26-fifth manual valve, 27-heating circulating pump, 28-eleventh electromagnetic valve, 29-twelfth electromagnetic valve, 30-sixth manual valve, 31-seventh manual valve, 32-eighth manual valve, 33-ninth manual valve, 34-tenth manual valve, 35-eleventh manual valve, 36-twelfth manual valve, 37-thirteenth manual valve, 38-spiral coil, 39-user heating end, 40-user domestic hot water end, 41-PLC controller, 42-battery pack, 43-charging controller, 44-bidirectional inverter, 45-circuit breaker, 46-grid-connected inverter. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] Please refer to Figure 1 and 2The application provides a PV / T and double-source heat pump coupled heat exchange system, which comprises:

[0029] The double-source heat pump unit comprises a water side branch, an air side branch, a heat pump main line, a first refrigeration branch and a second refrigeration branch.

[0030] The solar heat supply unit comprises a PV / T heat collector 1, a PV / T circulating pump 2 and a first electromagnetic valve 4.

[0031] Specifically, the double-source heat pump unit further comprises a heat pump heat supply branch, wherein the heat pump heat supply branch is sequentially provided with a heat supply side condenser / evaporator 12 and a tenth electromagnetic valve 23.

[0032] Specifically, the user side heat supply unit comprises a user heat supply main line, a user heat supply branch and an air energy water tank heating branch.

[0033] In the embodiment, the user heat supply end 39 is at least one of a floor heating coil, a radiator and a fan coil.

[0034] Specifically, the solar heating unit further comprises a wind-cooled heat dissipation branch, and the wind-cooled heat dissipation branch is sequentially provided with the PV / T heat dissipation device 3 and the second electromagnetic valve 5, the second electromagnetic valve 5 is connected with the outlet of the PV / T collector 1, and the outlet of the PV / T heat dissipation device 3 is connected with the inlet of the PV / T circulating pump 2.

[0035] In the embodiment, the PV / T heat dissipation device 3 is a wind-cooled radiator (for example, a finned radiator).

[0036] Specifically, the solar heating unit further comprises a solar water tank heating branch, and the solar water tank heating branch is provided with the third electromagnetic valve 6, the inlet of the third electromagnetic valve 6 is connected with the outlet of the PV / T collector 1, the outlet of the third electromagnetic valve 6 is connected with the inlet of the twelfth electromagnetic valve 29, and the conversion water tank 24 and the PV / T circulating pump 2 are further connected through a water supplement pipeline.

[0037] Specifically, the user-side heating unit further comprises a domestic hot water pipeline, one end of the domestic hot water pipeline is connected with a tap water source, the other end of the domestic hot water pipeline is connected with a user domestic hot water end 40, the domestic hot water pipeline is sequentially provided with the twelfth manual valve 36, the spiral coil 38 and the thirteenth manual valve 37, and the spiral coil 38 is arranged in the conversion water tank 24.

[0038] In the embodiment, the user domestic hot water end 40 is at least one of a shower faucet, a wash basin faucet and a kitchen sink faucet.

[0039] Specifically, the system further comprises an electric control unit, which comprises a PLC controller 41, a battery pack 42, a charging controller 43, a bidirectional inverter 44, a circuit breaker 45, a grid-connected inverter 46, the power grid is electrically connected with the PLC controller 41 through the circuit breaker 45 and the grid-connected inverter 46, the photovoltaic power generation part of the PV / T collector 1 is connected with the battery pack 42 through the charging controller 43, the battery pack 42 is connected with the PLC controller 41 through the bidirectional inverter 44, the PLC controller 41 is electrically connected with each electric device respectively, and automatic control of system operation is realized. The electric devices include the PV / T circulating pump 2, the heating circulating pump 27, the first to twelfth electromagnetic valves 29 and the compressor 13. In the system, the battery pack 42 serves as a main power supply to supply power to the electric devices of the system, and the remaining electric energy can be connected to the power grid through the grid-connected inverter 46 to realize flexible distribution and efficient utilization of electric energy; the power grid serves as a backup power supply to ensure stable operation of the system when the battery power supply is insufficient or fails.

[0040] Optionally, in some preferred embodiments, five temperature sensors T1-T5 are arranged to detect the temperatures of the outlet of the PV / T collector 1, the outlet of the water-side evaporator / condenser 10, the inside of the conversion water tank 24, the inlet of the user heating end 39 and the inlet of the user domestic hot water end 40 respectively, and each temperature sensor is electrically connected with the PLC controller 41.

[0041] Optionally, in some preferred embodiments, a first manual valve 7 is arranged at the outlet of the PV / T collector 1, the outlet of the first manual valve 7 is connected with the first solenoid valve 4, the second solenoid valve 5 and the third solenoid valve 6 respectively, and a third manual valve 9 is arranged between the water-side evaporator / condenser 10 and the PV / T circulating pump 2.

[0042] Optionally, in some preferred embodiments, a fourth manual valve 25 is arranged on the water supply pipeline.

[0043] Optionally, in some preferred embodiments, a fifth manual valve 26 is arranged between the conversion water tank 24 and the heating circulating pump 27, a sixth manual valve 30 and a seventh manual valve 31 are sequentially arranged between the twelfth solenoid valve 29 and the conversion water tank 24, an eighth manual valve 32 is arranged at the heat extraction side outlet of the heat supply-side condenser / evaporator 12, a ninth manual valve 33 is arranged between the eighth manual valve 32 and the user heat supply end 39, a tenth manual valve 34 is arranged at the outlet of the user heat supply end 39, the outlet of the tenth manual valve 34 is connected with the inlet of the seventh manual valve 31, and an eleventh manual valve 35 is arranged between the eighth manual valve 32 and the twelfth solenoid valve 29.

[0044] Working principle of the PV / T and dual-source heat pump coupled heat exchange system of the present application:

[0045] Through arranging temperature sensors T1 (detecting the outlet temperature of the PV / T collector 1), T2 (detecting the heat source side outlet temperature of the water-side evaporator / condenser 10) and T3 (detecting the internal temperature of the conversion water tank 24), the data of each temperature sensor is transmitted to the PLC controller 41 as the basis for working condition switching, and the temperature threshold values of each temperature sensor can be set by the PLC controller 41. The PV / T and dual-source heat pump coupled heat exchange system of the present application is divided into winter heating working condition and non-heating season working condition (including refrigeration demand and no refrigeration demand) according to seasonal demand and user use scenarios, and the specific operation process is as follows:

[0046] I. Non-heating season working condition

[0047] The core goal of this working condition is to ensure stable supply of domestic hot water (T3 meets the standard), and at the same time, the temperature of the PV / T collector 1 is reduced through heat dissipation to improve the photoelectric conversion efficiency, and according to whether the user has refrigeration demand, the working condition is divided into the following two scenarios:

[0048] 1. Non-heating season without refrigeration demand: The core task of the system is to cool and dissipate heat for the PV / T collector 1, which can be divided into two heat dissipation modes, and can be operated independently or cooperatively: ① Heat pump assisted heat dissipation mode: close the fourth solenoid valve 17, the fifth solenoid valve 18, the eighth solenoid valve 21, and the tenth solenoid valve 23, open the sixth solenoid valve 19, the seventh solenoid valve 20, and the ninth solenoid valve 22, the dual-source heat pump unit forms an independent refrigeration cycle, absorbs the heat energy of the PV / T collector 1 through the water-side evaporator / condenser 10, and then dissipates the heat energy to the outdoor through the air-side evaporator / condenser 11 to realize the cooling of the PV / T; ② Cooperative heat dissipation mode: simultaneously start the above-mentioned heat pump assisted heat dissipation mode and the air-cooled heat dissipation branch (open the second solenoid valve 5 and start the PV / T heat dissipation device 3), further improve the heat dissipation efficiency and ensure that the temperature of the PV / T collector 1 is stable in the high-efficiency power generation interval. In this process, the temperature T3 of the conversion water tank 24 is always guaranteed to meet the requirements of domestic hot water, and the conversion water tank 24 is continuously supplied with heat energy through the solar water tank heating branch. In the domestic hot water pipeline, the twelfth manual valve 36 and the thirteenth manual valve 37 are kept open, and the tap water is heated by the spiral coil 38 (placed in the conversion water tank 24) and then delivered to the user's domestic hot water end 40.

[0049] 2. Non-heating season with refrigeration demand: At this time, the PV / T heat dissipation and the heat pump refrigeration are independently operated, and the specific actions are as follows: for PV / T heat dissipation, open the second solenoid valve 5, the second manual valve 8 is in the open state, start the PV / T circulating pump 2 and the PV / T heat dissipation device 3, and cool the PV / T collector 1 by air cooling to ensure the photoelectric conversion efficiency, and in this process, the PV / T system is not associated with the heat pump system; for refrigeration, close the fifth solenoid valve 18, the seventh solenoid valve 20, the eighth solenoid valve 21, and the ninth solenoid valve 22, open the fourth solenoid valve 17, the sixth solenoid valve 19, and the tenth solenoid valve 23, open the eleventh solenoid valve 28 and the twelfth solenoid valve 29, and close the third solenoid valve 6, the dual-source heat pump unit switches to refrigeration mode, absorbs indoor heat through the air-side evaporator / condenser 11, realizes water air conditioning type cooling after heat exchange, and delivers the cooling capacity to the indoor through the user heating end 39.

[0050] II. Winter heating condition

[0051] The core goal of this condition is to ensure the user's heating demand, while giving priority to the use of heat energy generated by the PV / T collector 1, and considering the improvement of PV / T photoelectric conversion efficiency and reasonable allocation of energy, the specific operation logic is divided into the following scenarios:

[0052] 1. PV / T heat source available scenario (T1≥40℃ and T2≥20℃): PLC controller 41 issues instructions, and the system performs the following actions: close the fourth solenoid valve 17, the ninth solenoid valve 22, open the fifth solenoid valve 18, the eighth solenoid valve 21, the tenth solenoid valve 23; start the PV / T circulating pump 2, open the first solenoid valve 4, and keep the first manual valve and the third manual valve in the open state, so that the water side branch of the dual-source heat pump unit is connected, and the system switches to the water source heat pump operation mode; start the heating circulating pump 27 synchronously, open the eleventh solenoid valve 28 and the twelfth solenoid valve 29, and keep the fifth manual valve 26, the sixth manual valve 30, the seventh manual valve 31, the eighth manual valve 32, the ninth manual valve 33, the tenth manual valve 34, and the eleventh manual valve 35 in the open state, so that the user heating main circuit and the air energy water tank heating branch are connected. At this time, the heat energy generated by the PV / T collector 1 is transported to the water side evaporator / condenser 10 through the circulating pipeline, the dual-source heat pump absorbs the heat energy, and then completes heat exchange through the four-way valve 14 and the heating side condenser / evaporator 12. The heat energy after heat exchange is transported to the user heating end 39 through the user heating branch to realize heating; at the same time, the PV / T collector 1 maintains a low temperature due to the continuous removal of heat energy, effectively improving the photoelectric conversion efficiency.

[0053] 2. PV / T heat source unavailable scenario (T2<20℃): To ensure the stability of heating, the system switches to the air source heat pump mode, and the specific actions are as follows: close the fifth solenoid valve 18, the eighth solenoid valve 21, and the ninth solenoid valve 22, and stop the PV / T circulating pump 2; open the fourth solenoid valve 17, the sixth solenoid valve 19, and the tenth solenoid valve 23 to connect the air side branch of the dual-source heat pump unit; keep the heating circulating pump 27 running and the eleventh solenoid valve 28 and the twelfth solenoid valve 29 open. At this time, the system absorbs heat energy from the air through the air side evaporator / condenser 11, and then transports it to the user heating end 39 after heat exchange to ensure continuous and stable heating in low temperature environment.

[0054] 3. PV / T heat direct supply scenario (T1≥60℃): When the heat energy generated by the PV / T collector 1 is sufficient, the system switches to the direct supply mode to improve energy utilization efficiency, and the specific actions are as follows: open the third solenoid valve 6, keep the fourth manual valve 25 in the open state, start the PV / T circulating pump 2, and close the heat pump related heating branch; the heat energy of the PV / T collector 1 is directly transported to the user heating end 39 through the communication pipeline of the solar water tank heating branch and the user heating branch to realize direct supply heating, reducing the energy consumption of the heat pump.

[0055] 4. Winter non-heating period: The system prioritizes to ensure that the temperature T3 of the conversion water tank 24 reaches the daily hot water use requirements of users (such as 45-55℃), and through the opening of the third electromagnetic valve 6, the heat energy of the PV / T collector 1 is transported to the conversion water tank 24 to provide a heat source for hot water preparation. If the temperature of the PV / T collector 1 is still too high (affecting the photoelectric conversion efficiency), the second electromagnetic valve 5 is opened, and the second manual valve 8 is kept in an open state, the air-cooled heat dissipation branch is started, and the PV / T collector 1 is cooled by the PV / T heat dissipation device 3. At the same time, the electrical energy generated by the PV / T collector 1 is stored in the battery pack 42 through the charging controller 43, and the remaining electrical energy can be connected to the power grid through the grid-connected inverter 46, or directly supplied to the electrical equipment in the system through the bidirectional inverter 44, reducing the dependence on the power grid.

[0056] The whole system is automatically controlled by the electric control unit, the battery pack 42 is used as the main power supply to supply power to various electrical equipment, and the power grid is used as the backup power supply to automatically switch in when the battery power supply is insufficient or fails, ensuring the stable operation of the system; at the same time, the PLC controller 41 can automatically complete the working condition switching and component start-stop according to the temperature sensor feedback data and user preset requirements, realizing the optimal configuration of energy.

Claims

1. A heat exchange system coupled with PV / T and dual-source heat pump, characterized in that, Comprise: Double source heat pump unit, including water side branch, air side branch, heat pump main line, first refrigeration branch, second refrigeration branch, water side branch is sequentially provided with fifth solenoid valve, second expansion valve, water side evaporator / condenser, eighth solen valve, air side branch is sequentially provided with fourth solenoid valve, first expansion valve, air side evaporator / condenser, sixth solenoid valve, heat pump main line is provided with four-way reversing valve, first refrigeration branch is provided with seventh solenoid valve, second refrigeration branch is provided with ninth solenoid valve, the D port of four-way reversing valve is connected with compressor exhaust end, the suction end of compressor is connected with the S port of four-way reversing valve, one end of seventh solenoid valve is connected with the pipeline between water side evaporator / condenser and eighth solenoid valve, the other end is connected with the pipeline between first expansion valve and fourth solenoid valve, one end of ninth solenoid valve is connected with the E port of four-way reversing valve, the other end is connected with the pipeline between water side evaporator / condenser and second expansion valve, the C port of four-way reversing valve is connected with sixth solenoid valve and eighth solenoid valve respectively; Solar heating unit, including PV / T collector, PV / T circulating pump, first solenoid valve, PV / T collector, first solenoid valve, water side evaporator / condenser, PV / T circulating pump circuit connection in proper order.

2. The heat exchange system of claim 1, wherein: Double source heat pump unit further comprises heat pump heating branch, heat pump heating branch is sequentially provided with heating side condenser / evaporator, tenth solenoid valve, heating side condenser / evaporator heat source side inlet is connected with the E port of four-way reversing valve, and the outlet of tenth solenoid valve is connected with fourth solenoid valve and fifth solenoid valve respectively; Further comprising user side heating unit, including user heating main line, user heating branch, air energy water tank heating branch, user heating main line is sequentially provided with conversion water tank, heating circulating pump, eleventh solenoid valve, user heating branch is provided with user heating end, air energy water tank heating branch is provided with twelfth solenoid valve, eleventh solenoid valve is connected with heating side condenser / evaporator heat taking side inlet, and the heat taking side outlet of heating side condenser / evaporator is connected with user heating end and twelfth solenoid valve respectively, and user heating end and twelfth solenoid valve are connected with conversion water tank inlet.

3. The heat exchange system of claim 2, wherein: The solar heating unit further comprises air cooling heat dissipation branch, and the air cooling heat dissipation branch is sequentially provided with PV / T heat dissipation device and second solenoid valve, and the second solenoid valve is connected with the outlet of PV / T collector, and the outlet of PV / T heat dissipation device is connected with the inlet of PV / T circulating pump.

4. The heat exchange system of claim 3, wherein: The solar heating unit further comprises solar water tank heating branch, and the solar water tank heating branch is provided with third solenoid valve, the inlet of third solenoid valve is connected with the outlet of PV / T collector, the outlet of third solenoid valve is connected with the inlet of twelfth solenoid valve, and the conversion water tank and the PV / T circulating pump are further connected through a water supplement pipeline.

5. The heat exchange system of claim 4, wherein: The user side heating unit further comprises domestic hot water pipeline, one end of the domestic hot water pipeline is connected with a tap water source, the other end is connected with a user domestic hot water end, the domestic hot water pipeline is sequentially provided with twelfth manual valve, spiral coil and thirteenth manual valve, and the spiral coil is arranged in the conversion water tank.

6. The heat exchange system of claim 5, wherein: The electric control unit comprises a PLC controller, a battery pack, a charging controller, a bidirectional inverter, a circuit breaker, a grid-connected inverter, and a power grid, wherein the power grid is electrically connected to the PLC controller through the circuit breaker and the grid-connected inverter, the photovoltaic power generation part of the PV / T collector is connected to the battery pack through the charging controller, the battery pack is connected to the PLC controller through the bidirectional inverter, and the PLC controller is electrically connected to each electrical equipment.

7. The heat exchange system of claim 6, wherein: A first manual valve is arranged at the outlet of the PV / T collector, and the outlet of the first manual valve is connected to a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve respectively.

8. The heat exchange system of claim 7, wherein: A fourth manual valve is arranged on the water supply pipeline.

9. The heat exchange system of claim 8, wherein: A fifth manual valve is arranged between the conversion water tank and the heating circulating pump, a sixth manual valve and a seventh manual valve are sequentially arranged between the twelfth electromagnetic valve and the conversion water tank, an eighth manual valve is arranged at the outlet of the heating side condenser / evaporator, a ninth manual valve is arranged between the eighth manual valve and the user heating end, a tenth manual valve is arranged at the outlet of the user heating end, the outlet of the tenth manual valve is connected to the inlet of the seventh manual valve, and an eleventh manual valve is arranged between the eighth manual valve and the twelfth electromagnetic valve.

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