A refrigerant-based double-tank heat collection heating system and operation method

Abstract

The present invention relates to a double-water-tank heat collection and heating system based on refrigerant and an operation method, wherein the double-water-tank heat collection and heating system comprises a PVT heat collection system and a heat pump heat supply and heating system; the PVT heat collection system comprises a PVT heat collector module, a heat collection module and a refrigerant circulation module; the refrigerant circulation module is connected to the heat collection module through the PVT heat collector module; the heat pump heat supply and heating system comprises a PVT heat collector module, a refrigerant temperature reduction and pressure reduction module, an air-cooled heat exchange module, a heat release module and a refrigeration module; the refrigerant temperature reduction and pressure reduction module is connected to the heat release module through the PVT heat collector module or the air-cooled heat exchange module; the refrigerant temperature reduction and pressure reduction module is also connected to the refrigeration module. The beneficial effects of the present invention are: the present invention can meet the needs of users for hot water at any time throughout the year and cooling in summer, and also solves the freezing problem that may occur in the heat collector in winter.

Description

Technical Field

[0001] The invention relates to the field of solar energy utilization, and more specifically, to a refrigerant-based double-water-tank heat collection and heating system and an operating method. Background Art

[0002] Photovoltaic-thermal integration technology (i.e. PVT technology) absorbs photovoltaic waste heat through heat exchangers to reduce photovoltaic temperature and improve photovoltaic power generation efficiency. At the same time, the heat absorbed by the heat exchanger is used for domestic heating or hot water to achieve combined heat and power. Compared with traditional flat-plate collectors and photovoltaics, this technology has a higher solar energy utilization rate per unit area and more flexible utilization methods, so this technology has gradually received attention from the industry. There are many types of PVT technologies, most of which are used to produce domestic hot water, including water-based PVT collector technology and PVT heat pump technology.

[0003] If the water-based PVT heat collection technology adopts the traditional copper tube and tube sheet technology, the heat exchange efficiency is low; if an aluminum alloy heat exchanger is used, such as a blown plate, micro-channel, etc., although the heat exchange efficiency is high, the water-based medium will corrode the aluminum alloy heat exchanger and the service life is short; in addition, there is also the problem of antifreeze in winter.

[0004] PVT heat pump technology has high heat production efficiency, but the heat demand in summer is small, the heat pump operation time is short, and the power generation efficiency in other periods will be less than or equal to traditional photovoltaics, and the annual power generation gain is limited; if the heat pump operation time is extended by increasing the volume of the water tank, although the power generation efficiency will increase, there will be problems such as the water tank heating time is too long and users cannot use heat at any time, and the system power consumption will exceed the system photovoltaic power generation, and the proportion of renewable energy will decrease. The demand for cooling in summer is large, and the existing technology is to match an additional air conditioner, which increases capital costs and occupies a limited usable area. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a double-tank heat collection heating system based on refrigerant and an operating method. The technical solution is as follows:

[0006] In a first aspect, a refrigerant-based double-tank heat collection and heating system is provided, comprising: a PVT heat collection system, a heat pump heat supply and heating system;

[0007] The PVT heat collection system includes a PVT heat collector module, a heat collection module and a refrigerant circulation module; the refrigerant circulation module is connected to the heat collection module through the PVT heat collector module;

[0008] The heat pump heating system includes a PVT collector module, a refrigerant cooling and pressure reduction module, an air-cooled heat exchange module, a heat release module and a refrigeration module; the refrigerant cooling and pressure reduction module is connected to the heat release module through the PVT collector module or the air-cooled heat exchange module; the refrigerant cooling and pressure reduction module is also connected to the refrigeration module.

[0009] Preferably, the PVT collector module in the PVT collector system comprises: a first PVT collector and a second PVT collector arranged in parallel up and down, and the first PVT collector and the second PVT collector are connected to each other.

[0010] Preferably, the first PVT collector and the second PVT collector both include: a transparent protective layer, EVA glue, a photovoltaic cell, EVA glue, a back plate, a buffer layer, a collector, an insulating layer and a protective layer arranged in sequence from top to bottom, and the buffer layer is made of EVA glue or thermally conductive glue.

[0011] Preferably, the heat collector is composed of a trough-type flow channel heat exchanger, a refrigerant upper header, a refrigerant lower header and a heat exchange tube.

[0012] The groove-type flow channel heat exchanger adopts high thermal conductivity metal material; the width of the groove-type flow channel heat exchanger is more than 10mm and the height is 2-5mm; each groove-type flow channel heat exchanger is divided into multiple micro-flow channels, the flow channel width is 2-6mm, the flow channel height is 0.5-4mm, and each micro-flow channel contains micro-fins; the upper and lower ends of the groove-type flow channel heat exchanger are welded to the refrigerant upper header and the refrigerant lower header respectively; the heat exchange tubes are arranged in a serpentine manner and are fixed to the surface of the groove-type flow channel heat exchanger by welding or bonding with thermal conductive adhesive.

[0013] In a second aspect, a double-tank heat collection and heating method based on refrigerant is provided, which is performed by any double-tank heat collection and heating system based on refrigerant according to the first aspect, wherein the PVT heat collection system has a heat pipe heat collection operation mode and a refrigerant active circulation heat collection mode, and the heat pump heat supply and heating system has a solar water heating mode, an air source water heating mode and a cooling mode;

[0014] The heat pipe heat collection operation mode specifically includes the following steps:

[0015] Step 1: Close all electric valves;

[0016] Step 2: Start the heat collection circulation water pump;

[0017] The refrigerant active circulation heat collection mode specifically comprises the following steps:

[0018] Step 1, open the first electric valve, the second electric valve, the third electric valve, the fourth electric valve, and the fifth electric valve, and close the remaining electric valves;

[0019] Step 2: Turn on the refrigerant circulation pump;

[0020] The solar water heating mode specifically includes the following steps:

[0021] Step 1, open the first electric valve, the second electric valve, the third electric valve, the fourth electric valve, the tenth electric valve, the eleventh electric valve, the twelfth electric valve, the fourteenth electric valve, and the seventh electric valve, and close the remaining electric valves;

[0022] Step 2: Connect the ends a and b of the four-way reversing valve, and connect the ends c and d;

[0023] The air source hot water making mode specifically includes the following steps:

[0024] Step 1, open the first electric valve, the second electric valve, the third electric valve, the fourth electric valve, the ninth electric valve, the eleventh electric valve, the twelfth electric valve, the fourteenth electric valve, and the seventh electric valve, and close the remaining electric valves;

[0025] Step 2: Connect the ends a and b of the four-way reversing valve, and connect the ends c and d;

[0026] The cooling mode specifically comprises the following steps:

[0027] Step 1, open the sixth electric valve, the sixteenth electric valve, the fifteenth electric valve, the thirteenth electric valve, and the eighth electric valve, and close the remaining electric valves;

[0028] Step 2: Connect the ends c and b of the four-way reversing valve, and connect the ends a and d.

[0029] Preferably, the hot water supply tank is a constant temperature water tank with a specified temperature (40-60°C), and the water supply source comes from the heat collecting tank; when the hot water in the hot water supply tank is sent to the heating end, tap water is added to the water supply port of the heat collecting tank, and then the hot water on the top of the heat collecting tank is sent to the hot water supply tank; when the temperature of the hot water supply tank is lower than the specified temperature (40-60°C), the heat pump heating system will operate the solar water making mode or the air source water making mode.

[0030] Preferably, when the temperature of the hot water tank is lower than the specified temperature (40-60°C) and the current of the first PVT collector or the second PVT collector is not greater than the set value (0-1A), the heat pump heating system operates in the air source hot water making mode; when the temperature of the hot water tank is lower than the specified temperature (40-60°C) and the current of the first PVT collector and the second PVT collector are both greater than the set value (0-1A), the heat pump heating system operates in the solar hot water making mode.

[0031] Preferably, under summer conditions (June 21st to September 21st), when the heat pump heating system is not in the solar water heating mode, and the refrigerant upper header is more than 5°C higher than the water temperature in the lower part of the water collection tank, the PVT collector system operates the heat pipe collector operation mode until the water collection tank temperature reaches the specified temperature (40-60°C) and stops operating; when the refrigerant upper header is within 5°C higher than the water temperature in the lower part of the water collection tank, the PVT collector system does not operate; when the water supply tank temperature is the specified temperature (40-60°C) and the user has a cooling demand, the heat pump heating system operates the cooling mode.

[0032] Preferably, under non-summer conditions, when the heat pump heating system is not in solar water heating mode, and the refrigerant upper header is more than 5°C higher than the water temperature in the lower part of the water collection tank, the PVT collector system operates the refrigerant active circulation collector mode until the water collection tank temperature reaches the specified temperature (40-60°C) and stops operating; when the refrigerant upper header is within 5°C higher than the water temperature in the lower part of the water collection tank, the PVT collector system does not operate.

[0033] The beneficial effects of the present invention are as follows: the present invention includes a PVT heat collection system and a heat pump heating system. The PVT heat collection system has a heat pipe heat collection operation mode and a refrigerant active circulation heat collection mode. The heat pump heating system has a solar water heating mode, an air source water heating mode and a cooling mode. The present invention can meet the needs of users for hot water at any time throughout the year and cooling in summer, and also solves the problem of freezing of the collector in winter. The technology is used in buildings, which can greatly reduce building energy consumption and carbon emissions. It has important social and economic value and great application potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the structure of a double water tank heat collection heating system provided for this application;

[0035] Figure 2 Schematic diagram of the PVT collector structure provided for this application;

[0036] Figure 3 AA cross-sectional schematic diagram of the PVT collector provided for this application;

[0037] Figure 4 Schematic diagram of the BB section of the PVT collector provided for this application;

[0038] Description of the reference numerals: first PVT collector 1, first electric valve 2, second PVT collector 3, second electric valve 4, third electric valve 5, fourth electric valve 6, refrigerant circulation pump 7, liquid storage tank 8, fifth electric valve 9, sixth electric valve 10, seventh electric valve 11, condensing heat exchanger 12, hot water tank 13, second liquid storage tank 14, electronic expansion valve 15, eighth electric valve 16, ninth electric valve 17, tenth electric valve 18, eleventh electric valve 19, twelfth electric valve 20, air-cooled heat exchanger 21, thirteenth electric valve 22, refrigeration Agent filling port 23, gas-liquid separator 24, compressor 25, four-way reversing valve 26, fourteenth electric valve 27, fifteenth electric valve 28, guide valve 29, sixteenth electric valve 30, evaporator 31, heat exchanger 32, heat collecting tank 33, heat collecting circulating water pump 34, cold water tank 35, refrigerant upper header 36, heat exchange tube 37, collector 38, grooved flow channel heat exchanger 39, junction box 40, refrigerant lower header 41, transparent protective layer 42, EVA glue 43, photovoltaic cell 44, EVA glue 45, backboard 46, buffer layer 47, thermal insulation layer 48, protective layer 49. DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0040] Embodiment 1:

[0041] like Figure 1 As shown, the refrigerant-based double-tank thermal collection heating system includes: a PVT thermal collection system and a heat pump heating system.

[0042] The PVT collector system includes a PVT collector module, a collector module and a refrigerant circulation module; the refrigerant circulation module is connected to the collector module through the PVT collector module. The PVT collector module includes: a first PVT collector 1, a first electric valve 2, a second PVT collector 3, a second electric valve 4, a third electric valve 5, and a fourth electric valve 6. The first PVT collector 1 and the second PVT collector 3 are arranged in parallel up and down, and the first PVT collector 1 and the second PVT collector 3 are connected to each other. The refrigerant circulation module includes a refrigerant circulation pump 7, a liquid storage tank 8, and a fifth electric valve 9. The collector module includes a heat exchanger 32, a collector water tank 33 and a collector circulation water pump 34.

[0043] The heat pump heating system includes a PVT collector module, a refrigerant cooling and pressure reduction module, an air-cooled heat exchange module, a heat release module and a refrigeration module; the refrigerant cooling and pressure reduction module is connected to the heat release module through the PVT collector module or the air-cooled heat exchange module; the refrigerant cooling and pressure reduction module is also connected to the refrigeration module. The PVT collector module includes: a first PVT collector 1, a first electric valve 2, a second PVT collector 3, a second electric valve 4, a third electric valve 5, and a fourth electric valve 6. The first PVT collector 1 and the second PVT collector 3 are arranged in parallel up and down, and the first PVT collector 1 and the second PVT collector 3 are connected to each other. The refrigerant cooling and pressure reduction module includes a seventh electric valve 11, a second liquid storage tank 14, an electronic expansion valve 15 and a tenth electric valve 18. The heat release module includes an eleventh electric valve 19, a twelfth electric valve 20, a four-way reversing valve 26, a refrigerant filling port 23, a gas-liquid separator 24 and a compressor 25, a fourteenth electric valve 27, a fifteenth electric valve 28, a sixteenth electric valve 30, a condensing heat exchanger 12 and a hot water tank 13. The air-cooling heat exchange module includes a ninth electric valve 17, an air-cooling heat exchanger 21 and a thirteenth electric valve 22. The refrigeration module includes a sixth electric valve 10, an evaporator 31, a cold water tank 35 and an eighth electric valve 16.

[0044] like Figure 2 As shown, the collector 38 in the PVT collector is composed of a plurality of grooved channel heat exchangers 39, a refrigerant upper header 36, a refrigerant lower header 41, and a heat exchange tube 37. The grooved channel heat exchanger 39 is made of a high thermal conductivity metal material; the width of the grooved channel heat exchanger 39 is more than 10 mm, and the height is 2 to 5 mm; each grooved channel heat exchanger 39 is divided into a plurality of micro channels, the channel width is 2 to 6 mm, the channel height is 0.5 to 4 mm, and each micro channel contains a micro fin; the upper and lower ends of the grooved channel heat exchanger 39 are welded to the refrigerant upper header 35 and the refrigerant lower header 41 respectively; the heat exchange tube 36 is arranged in a serpentine manner and is fixed to the surface of the grooved channel heat exchanger 39 by welding or thermal conductive adhesive.

[0045] like Figure 3 and Figure 4 As shown, the first PVT collector 1 and the second PVT collector 3 both include: a transparent protective layer 42, EVA glue 43, a photovoltaic cell 44, EVA glue 45, a back plate 46, a buffer layer 47, a collector 38, a thermal insulation layer 48, and a protective layer 49 arranged in sequence from top to bottom, and the buffer layer 47 is made of EVA glue or thermal conductive glue.

[0046] Embodiment 2:

[0047] A refrigerant-based double-water-tank heat collection and heating method is performed by a refrigerant-based double-water-tank heat collection and heating system, which includes: a PVT heat collection system and a heat pump heating and heating system. The PVT heat collection system has a heat pipe heat collection operation mode and a refrigerant active circulation heat collection mode, and the heat pump heating and heating system has a solar water heating mode, an air source water heating mode and a cooling mode.

[0048] The heat pipe collector operation mode specifically includes the following steps:

[0049] Step 1: Close all electric valves;

[0050] Step 2: Turn on the heat collection circulation water pump.

[0051] The water with relatively low temperature at the bottom of the heat collecting tank 33 enters the heat exchange tube 37 to absorb the heat of the groove-type flow channel heat exchanger 39, and then enters the upper part of the heat collecting tank 33; the heat collector 38 works according to the heat pipe principle, that is, the liquid refrigerant at the bottom of the groove-type flow channel heat exchanger 39 absorbs the photovoltaic waste heat, undergoes a phase change and evaporates to become a gas, the gaseous refrigerant rises and releases heat to the heat exchange tube 37, the gaseous refrigerant cools down and becomes liquid, the liquid refrigerant refluxes under the action of gravity and capillary force, and then continues to absorb and release heat.

[0052] The refrigerant active circulation heat collection mode specifically includes the following steps:

[0053] Step 1, open the first electric valve 2, the second electric valve 4, the third electric valve 5, the fourth electric valve 6, the fifth electric valve 9, and close the remaining electric valves;

[0054] Step 2: Start the refrigerant circulation pump 7.

[0055] The refrigerant enters the refrigerant lower header 41 from the third electric valve 5 and the fourth electric valve 6, and then enters the trough-type flow channel heat exchanger 39 to absorb photovoltaic waste heat. After the liquid refrigerant becomes gaseous, it passes through the refrigerant upper header 36, the first electric valve 2, the second electric valve 4, and then enters the heat exchanger 32 to release the heat to the heat collection tank 33.

[0056] The solar water heating mode specifically includes the following steps:

[0057] Step 1, open the first electric valve 2, the second electric valve 4, the third electric valve 5, the fourth electric valve 6, the tenth electric valve 18, the eleventh electric valve 19, the twelfth electric valve 20, the fourteenth electric valve 27, the seventh electric valve 11, and close the remaining electric valves;

[0058] Step 2: connect the ends a and b of the four-way reversing valve 26, and connect the ends c and d.

[0059] The refrigerant passes through the electronic expansion valve 15 to reduce temperature and pressure, passes through the third electric valve 5 and the fourth electric valve 6, and then enters the refrigerant lower header 41, and then enters the trough-type flow channel heat exchanger 39 to absorb photovoltaic waste heat. After the liquid refrigerant becomes gaseous, it passes through the refrigerant upper header 36, the first electric valve 2, the second electric valve 4, the eleventh electric valve 19, the four-way reversing valve 26, and the gas-liquid separator 24, and enters the compressor 25 for compression. The high-temperature and high-pressure refrigerant enters the condensing heat exchanger 12 through the fourteenth electric valve 27, and releases heat to the hot water tank 13. After the refrigerant is cooled, it passes through the seventh electric valve 11 and the second liquid storage tank 14 in sequence to start the next hot water production cycle;

[0060] The air source hot water mode specifically includes the following steps:

[0061] Step 1, open the first electric valve 2, the second electric valve 4, the third electric valve 5, the fourth electric valve 6, the ninth electric valve 17, the eleventh electric valve 19, the twelfth electric valve 20, the fourteenth electric valve 27, the seventh electric valve 11, and close the remaining electric valves;

[0062] Step 2: connect the ends a and b of the four-way reversing valve 26, and connect the ends c and d.

[0063] The refrigerant is cooled and reduced in pressure by the electronic expansion valve 15, and enters the air-cooled heat exchanger 21 through the ninth electric valve 17 to absorb ambient heat. The liquid refrigerant is converted into gas and passes through the four-way reversing valve 26 and the gas-liquid separator 24, and enters the compressor 25 for compression. The high-temperature and high-pressure refrigerant enters the condensing heat exchanger 12 through the fourteenth electric valve 27, and releases heat to the hot water tank 13. After the refrigerant is cooled, it passes through the seventh electric valve 11 and the second liquid storage tank 14 in sequence to start the next hot water production cycle.

[0064] The cooling mode specifically includes the following steps:

[0065] Step 1, open the sixth electric valve 10, the sixteenth electric valve 30, the fifteenth electric valve 28, the thirteenth electric valve 22, and the eighth electric valve 16, and close the remaining electric valves;

[0066] Step 2: Connect the ends c and b of the four-way reversing valve 26, and connect the ends a and d.

[0067] The refrigerant is cooled and reduced in pressure by the electronic expansion valve 15, and enters the evaporator 31 through the sixth electric valve 10, where it absorbs heat from the cooling water tank 35, thereby reducing the temperature of the water medium and causing the refrigerant to heat up and become gaseous. The refrigerant then passes through the sixteenth electric valve 30, the fifteenth electric valve 28, and the gas-liquid separator 24, and enters the compressor 25 for compression. The high-temperature and high-pressure refrigerant enters the air-cooled heat exchanger 21 through the thirteenth electric valve 22 to dissipate heat, and then enters the electronic expansion valve 15 through the eighth electric valve 16 to start the next refrigeration cycle.

[0068] It should be noted that, under normal circumstances, the hot water tank 13 is a constant temperature water tank, the temperature is maintained at a specified temperature (40-60°C), and the water supply source comes from the hot water collection tank 33; when the hot water in the hot water tank 13 is sent to the heating end, tap water is added to the water supply port of the hot water collection tank, and then the hot water on the upper part of the hot water collection tank 13 is sent to the hot water tank 13; when the temperature of the hot water tank 13 is lower than the specified temperature (40-60°C), the heat pump heating system will operate the solar water heating mode or the air source water heating mode. Among them, when the temperature of the hot water tank 13 is lower than the specified temperature (40-60°C), the heat pump heating system adopts the corresponding operation mode according to the current size of the first PVT collector 1 or the PVT collector 3. For example, when the temperature of the hot water tank 13 is lower than the specified temperature (40-60°C) and the current of the first PVT collector 1 or the second PVT collector 3 is not greater than the set value (0-1A), the heat pump heating system operates in the air source hot water making mode; when the temperature of the hot water tank 13 is lower than the specified temperature (40-60°C) and the current of the first PVT collector 1 and the PVT collector 3 are both greater than the set value (0-1A), the heat pump heating system operates in the solar hot water making mode.

[0069] In summer, when the heat pump heating system is not in the solar water heating mode, and the refrigerant upper header 35 is more than 5°C higher than the water temperature at the bottom of the water collection tank 33, the PVT collector system operates in the heat pipe collector operation mode until the water collection tank temperature 33 reaches the specified temperature (40-60°C) and stops operating; when the refrigerant upper header 35 is within 5°C higher than the water temperature at the bottom of the water collection tank 33, the PVT collector system does not operate; when the temperature of the water supply tank 13 is the specified temperature (40-60°C) and the user has a cooling demand, the heat pump heating system operates in the cooling mode.

[0070] In the transition season and winter, when the heat pump heating system is not in the solar water heating mode, and the refrigerant upper header 35 is more than 5°C higher than the water temperature at the bottom of the water collection tank 33, the PVT collector system operates in the refrigerant active circulation collector mode until the water collection tank temperature 33 reaches the specified temperature (40-60°C) and stops running; when the refrigerant upper header 35 is within 5°C higher than the water temperature at the bottom of the water collection tank 33, the PVT collector system does not operate.

Claims

1. A double-tank heat collection heating system based on refrigerant, characterized in that: include: PVT collector system and heat pump heating system; The PVT heat collection system includes a PVT heat collector module, a heat collection module and a refrigerant circulation module; The refrigerant circulation module is connected to the heat collection module through the PVT heat collector module; the PVT heat collector module comprises: a first PVT heat collector (1), a first electric valve (2), a second PVT heat collector (3), a second electric valve (4), a third electric valve (5), and a fourth electric valve (6); the refrigerant circulation module comprises a refrigerant circulation pump (7), a liquid storage tank (8), and a fifth electric valve (9); the heat collection module comprises a heat exchanger (32), a heat collection water tank (33), and a heat collection circulation water pump (34); the first PVT heat collector (1) and the second PVT heat collector (3) are arranged in parallel up and down and are connected to each other; the first electric valve (2) is connected to the first PVT heat collector (1); the second electric valve (4) is connected to the second PVT heat collector (3); The refrigerant circulation pump (7) is connected to the fifth electric valve (9) via the liquid storage tank (8); the end of the refrigerant circulation pump (7) away from the liquid storage tank (8) is connected to the first PVT collector (1) via the third electric valve (5), and is connected to the second PVT collector (3) via the fourth electric valve (6); the first PVT collector (1) and the second PVT collector (3) are connected to the heat collection tank (33) via the heat circulation water pump (34), and the heat exchanger (32) is arranged in the heat collection tank (33); The heat pump heating system comprises a PVT collector module, a refrigerant temperature reduction and pressure reduction module, an air-cooled heat exchange module, a heat release module and a refrigeration module; the refrigerant temperature reduction and pressure reduction module is connected to the heat release module via the PVT collector module or the air-cooled heat exchange module; the refrigerant temperature reduction and pressure reduction module is also connected to the refrigeration module; the refrigerant temperature reduction and pressure reduction module comprises a seventh electric valve (11), a second liquid storage tank (14), an electronic expansion valve (15) and a tenth electric valve (18); the air-cooled heat exchange module comprises a ninth electric valve (17), an air-cooled heat exchanger (21) and The thirteenth electric valve (22); the heat release module comprises the eleventh electric valve (19), the twelfth electric valve (20), the four-way reversing valve (26), the refrigerant filling port (23), the gas-liquid separator (24) and the compressor (25), the fourteenth electric valve (27), the fifteenth electric valve (28), the sixteenth electric valve (30), the condensing heat exchanger (12) and the hot water supply tank (13); the refrigeration module comprises the sixth electric valve (10), the evaporator (31), the cold water supply tank (35) and the eighth electric valve (16); One end of the seventh electric valve (11) is connected to the condensing heat exchanger (12) in the hot water tank (13), and the other end is connected to the second liquid storage tank (14) and the sixth electric valve (10); the second liquid storage tank (14) is respectively connected to the eighth electric valve (16), the ninth electric valve (17) and the tenth electric valve (18) through the electronic expansion valve (15); the end of the tenth electric valve (18) away from the electronic expansion valve (15) is connected to the third electric valve (5) and the fourth electric valve (6); the ends of the eighth electric valve (16) and the ninth electric valve (17) away from the electronic expansion valve (15) are both connected to the air-cooled heat exchanger (21); the air-cooled heat exchanger (21) is connected to the twelfth electric valve (18) through the twelfth electric valve (18); The door (20) is connected to the four-way reversing valve (26); the air-cooled heat exchanger (21) is also connected to the first electric valve (2) and the second electric valve (4) through the thirteenth electric valve (22) and the eleventh electric valve (19) in sequence; the four-way reversing valve (26), the refrigerant filling port (23), the gas-liquid separator (24) and the compressor (25) are connected end to end; the four-way reversing valve (26) is also connected to the condensing heat exchanger (12) through the fifteenth electric valve (28); the four-way reversing valve (26) is also connected to the evaporator (31) in the cold water tank (35) through the fourteenth electric valve (27), the guide valve (29) and the sixteenth electric valve (30); the hot water tank (13) is connected to the hot water collecting tank (33).

2. The refrigerant-based double-tank heat collection heating system according to claim 1 is characterized in that: The first PVT collector (1) and the second PVT collector (3) both comprise: a transparent protective layer (42), EVA glue, a photovoltaic cell (44), EVA glue, a back plate (46), a buffer layer (47), a collector (38), a thermal insulation layer (48) and a protective layer (49) arranged in sequence from top to bottom, wherein the buffer layer (47) is made of EVA glue or thermally conductive glue.

3. The refrigerant-based double-water-tank heat collection and heating system according to claim 2 is characterized in that: The heat collector (38) is composed of a trough-type flow channel heat exchanger (39), a refrigerant upper header (36), a refrigerant lower header (41) and a heat exchange tube (37).

4. The refrigerant-based double-water-tank heat collection heating system according to claim 3 is characterized in that: The groove-type flow channel heat exchanger (39) is made of high thermal conductivity metal material; the width of the groove-type flow channel heat exchanger (39) is more than 10 mm and the height is 2 to 5 mm; each groove-type flow channel heat exchanger (39) is divided into a plurality of micro-flow channels, the flow channel width is 2 to 6 mm, the flow channel height is 0.5 to 4 mm, and each micro-flow channel contains a micro-fin; the upper end and the lower end of the groove-type flow channel heat exchanger (39) are welded to the refrigerant upper header (36) and the refrigerant lower header (41) respectively; the heat exchange tube (37) is arranged in a serpentine manner and is fixed to the surface of the groove-type flow channel heat exchanger (39) by welding or bonding with a thermal conductive adhesive.

5. A double-water-tank heat collection and heating method based on refrigerant, which is performed by the double-water-tank heat collection and heating system based on refrigerant according to claim 3 or 4, characterized in that: The PVT heat collection system has a heat pipe heat collection operation mode and a refrigerant active circulation heat collection mode, and the heat pump heating system has a solar water heating mode, an air source water heating mode and a cooling mode; The heat pipe heat collection operation mode specifically includes the following steps: Step 1: Close all electric valves; Step 2: Start the heat collection circulation water pump; The refrigerant active circulation heat collection mode specifically comprises the following steps: Step 1: Open the first electric valve (2), the second electric valve (4), the third electric valve (5), the fourth electric valve (6), and the fifth electric valve (9), and close the remaining electric valves; Step 2, start the refrigerant circulation pump (7); The solar water heating mode specifically includes the following steps: Step 1: Open the first electric valve (2), the second electric valve (4), the third electric valve (5), the fourth electric valve (6), the tenth electric valve (18), the eleventh electric valve (19), the twelfth electric valve (20), the fourteenth electric valve (27), and the seventh electric valve (11), and close the remaining electric valves; Step 2, connecting the ends a and b of the four-way reversing valve (26), and connecting the ends c and d; The air source hot water making mode specifically includes the following steps: Step 1: Open the first electric valve (2), the second electric valve (4), the third electric valve (5), the fourth electric valve (6), the ninth electric valve (17), the eleventh electric valve (19), the twelfth electric valve (20), the fourteenth electric valve (27), and the seventh electric valve (11), and close the remaining electric valves; Step 2, connecting the ends a and b of the four-way reversing valve (26), and connecting the ends c and d; The cooling mode specifically comprises the following steps: Step 1: Open the sixth electric valve (10), the sixteenth electric valve (30), the fifteenth electric valve (28), the thirteenth electric valve (22), and the eighth electric valve (16), and close the remaining electric valves; Step 2: Connect the ends c and b of the four-way reversing valve (26), and connect the ends a and d.

6. The double-water-tank heat collection and heating method based on refrigerant according to claim 5 is characterized in that: The hot water supply tank (13) is a constant temperature water tank having a specified temperature of 40 to 60° C. The water supply source is from the hot water collection tank (33); when the hot water in the hot water supply tank (13) is sent to the heating end, tap water is added to the water supply port of the hot water collection tank, and then the hot water on the upper part of the hot water collection tank (33) is sent to the hot water supply tank (13); when the temperature of the hot water supply tank (13) is lower than the specified temperature, the heat pump heating system will operate the solar water heating mode or the air source water heating mode.

7. The double-tank heat collection and heating method based on refrigerant according to claim 6 is characterized in that: When the temperature of the hot water tank (13) is lower than the specified temperature and the current of the first PVT collector (1) or the second PVT collector (3) is not greater than the set value, the heat pump heating system operates in the air source hot water making mode; when the temperature of the hot water tank (13) is lower than the specified temperature and the current of the first PVT collector (1) and the second PVT collector (3) are both greater than the set value, the heat pump heating system operates in the solar hot water making mode; the set value range is 0 to 1A.

8. The double-water-tank heat collection and heating method based on refrigerant according to claim 7 is characterized in that: Under summer conditions from June 21 to September 21, when the heat pump heating system is not in the solar water heating mode, and the refrigerant upper header (36) is more than 5°C higher than the water temperature at the bottom of the water collection tank (33), the PVT heat collection system operates in the heat pipe heat collection operation mode until the temperature of the water collection tank (33) reaches a specified temperature and stops operating; when the refrigerant upper header (36) is within 5°C higher than the water temperature at the bottom of the water collection tank (33), the PVT heat collection system does not operate; when the temperature of the water supply tank (13) is the specified temperature and the user has a cooling demand, the heat pump heating system operates in the cooling mode.

9. The refrigerant-based double-water-tank heat collection and heating method according to claim 8, characterized in that: Under non-summer conditions, when the heat pump heating system is not in the solar water heating mode, and the refrigerant upper header (36) is more than 5°C higher than the water temperature at the bottom of the water collection tank (33), the PVT heat collection system operates in the refrigerant active circulation heat collection mode until the temperature of the water collection tank (33) reaches a specified level and stops operating; when the refrigerant upper header (36) is within 5°C higher than the water temperature at the bottom of the water collection tank (33), the PVT heat collection system does not operate.

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