Solar coupling heat recovery type heat pump triple co-generation system

Abstract

The utility model discloses a triple co-generation system of a solar coupling heat recovery type heat pump, which comprises a first heat exchanger (1), the outside of the first heat exchanger (1) is respectively connected with a refrigerant circulating component and a solar hot water circulating component, and the outside of the refrigerant circulating component is connected with an air-conditioning water circulating component through a second heat exchanger (2); the refrigerant circulation assembly comprises a first circulation pipe (3), one side of the first circulation pipe (3) is connected with a first heat exchanger (1), the first circulation pipe (3) is sequentially connected with a gas-liquid separator (4), a compressor (5) and a four-way valve (6), the outside of the four-way valve (6) is connected with a second circulation pipe (7), the second circulation pipe (7) is connected with an expansion valve (8) and a third heat exchanger (9), and the expansion valve (8) is connected with a second heat exchanger (9). And the outside of the second circulating pipe (7) is connected with a second heat exchanger (2). According to the utility model, multi-energy complementation and waste heat utilization can be realized, so that the utilization rate of heat energy is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of building energy utilization systems, especially a kind of solar energy coupling heat recovery type heat pump's triple generation system. BACKGROUND

[0002] Solar energy collector is a kind of device using solar energy to heat water, because it has the characteristics of saving power consumption, hot water effect is good, environmental protection, etc., so it is widely used as a heating equipment. On this basis, the current application mode of solar energy collector is combined with hot water supply tank, the external connection of hot water supply tank is connected with tap water interface, so that the water level in hot water supply tank is kept in constant range;When the water temperature in hot water supply tank is lower than threshold value, the water in hot water supply tank is pumped into solar energy collector by circulating water pump, and then the water is heated to specified temperature by solar energy collector and then pumped into hot water supply tank, so that the water temperature in hot water supply tank is kept constant, and the user can extract and use the hot water in hot water supply tank at any time, to realize the heating effect.

[0003] But the defect of this application mode is that the user only uses the hot water in hot water supply tank as domestic water, which reduces the utilization rate of heat energy. Secondly, because the user needs to take hot water in hot water supply tank at irregular intervals, it is difficult to keep the temperature of hot water in tank constant, so that it cannot be used as a heat medium to stably heat other facilities, thereby increasing the difficulty of using solar energy collector.

[0004] Therefore, the existing hot water system based on solar energy collector has the problems of single function and low heat energy utilization rate. INVENTION CONTENTS

[0005] The utility model aims at providing a kind of solar energy coupling heat recovery type VRF's triple generation system. It can realize multi-energy complementation and waste heat utilization, thereby improving the utilization rate of heat energy.

[0006] The technical scheme of the utility model: a kind of solar energy coupling heat recovery type VRF's triple generation system, including first heat exchanger, the outside of first heat exchanger is connected with refrigerant circulation assembly, solar energy hot water circulation assembly and domestic hot water circulation assembly respectively, the outside of refrigerant circulation assembly is connected with air conditioning water circulation assembly by second heat exchanger;The refrigerant circulation assembly includes first circulation pipe, one side of first circulation pipe is connected with first heat exchanger, gas-liquid separator, compressor and four-way valve are sequentially connected on first circulation pipe, four-way valve is connected with second circulation pipe outside, expansion valve and third heat exchanger are connected on second circulation pipe respectively, the outside of second circulation pipe is connected with second heat exchanger.

[0007] In the aforementioned solar energy coupled heat recovery type heat pump triple generation system, the first circulating pipe is provided with a first pipe body and a second pipe body connected in parallel, the first pipe body is sequentially connected with an electromagnetic valve and a first heat exchanger, and the second pipe body is connected with an electromagnetic valve.

[0008] In the aforementioned solar energy coupled heat recovery type heat pump triple generation system, the second circulating pipe is provided with a third pipe body and a fourth pipe body connected in parallel, the third pipe body is sequentially connected with an electromagnetic valve and a second heat exchanger, and the fourth pipe body is connected with an electromagnetic valve.

[0009] In the aforementioned solar energy coupled heat recovery type heat pump triple generation system, the first heat exchanger is a volumetric heat exchanger, and the first heat exchanger is externally connected with a domestic water inlet pipe and a domestic water outlet pipe.

[0010] In the aforementioned solar energy coupled heat recovery type heat pump triple generation system, the third heat exchanger is an air-cooled heat pump unit air-refrigerant heat exchanger.

[0011] In the aforementioned solar energy coupled heat recovery type heat pump triple generation system, the third heat exchanger is a water-air heat exchanger, and the third heat exchanger is externally connected with a ground source heat pump buried pipe.

[0012] In the aforementioned solar energy coupled heat recovery type heat pump triple generation system, the air conditioning water circulation assembly comprises a fan coil, and the fan coil is externally connected with the second heat exchanger through the third circulating pipe.

[0013] In the aforementioned solar energy coupled heat recovery type heat pump triple generation system, the solar water heating circulation assembly comprises a solar collector, the solar collector is externally connected with a heat preservation water tank through the fourth circulating pipe, the heat preservation water tank is externally connected with a water supplement pipe, and the heat preservation water tank and the volumetric heat exchanger are connected with each other through the fifth circulating pipe.

[0014] In the aforementioned solar energy coupled heat recovery type heat pump triple generation system, the first heat exchanger is externally connected with a heating water circulation assembly, the heating water circulation assembly comprises a floor heating sub-collector, and the floor heating sub-collector is connected with the first heat exchanger through the sixth circulating pipe.

[0015] Compared with the prior art, the utility model has the following characteristics:

[0016] (1) the utility model discloses a structure cooperation of first heat exchanger and solar water heating circulation assembly, so that the hot water generated after heating of the solar collector can be filled into the volumetric heat exchanger as a heat source, so that it can not only be used for the supply of domestic hot water, but also can be used as a heat source for heat exchange with the hot water of the heating system, thereby effectively improving the utilization rate and functionality of the heat energy generated by the solar collector.

[0017] (2) Through the structure limitation of the refrigerant circulation assembly, high-temperature refrigerant at the compressor outlet can be filled into the volumetric heat exchanger as a heat source and exchanged with the hot medium of the domestic hot water and the ground heating circulation assembly in the first heat exchanger, so that the functions of heating domestic hot water and heating are realized, and the multi-energy complementary effect is formed;

[0018] (3) Through the structure cooperation of the first heat exchanger, the second heat exchanger, the third heat exchanger and the solar water heating circulation assembly, when the refrigerant circulation assembly is in the cooling or dehumidification working condition, the condensation heat can be recovered and the hot water in the first heat exchanger can be heated, so that the utility model can realize the functions of part of the fan coil cooling, part of the fan coil and the ground heating system heating and dehumidification working condition normal temperature air supply in the transition season and the like, and the functionality of the system is further improved;

[0019] (4) Through the structure cooperation of the third heat exchanger and the ground source heat pump, the utility model can also be used in combination with the solar collector and the heat pump system, and the energy supply of the domestic hot water, the air conditioning water circulation assembly and the refrigerant circulation assembly is realized, the utilization effect of renewable energy is improved, and the energy-saving and emission-reducing effect is achieved;

[0020] Therefore, the utility model can realize multi-energy complementation and waste heat utilization, so that the utilization rate of heat energy is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic view of embodiment 1;

[0022] Figure 2 is a flow schematic view of the refrigerant in the refrigeration working condition in embodiment 1;

[0023] Figure 3 is a flow schematic view of the refrigerant in the dehumidification working condition in embodiment 1;

[0024] Figure 4 is a structural schematic view of embodiment 2.

[0025] The marks in the drawings are as follows: 1-first heat exchanger, 2-second heat exchanger, 3-first circulation pipe, 4-gas-liquid separator, 5-compressor, 6-four-way valve, 7-second circulation pipe, 8-expansion valve, 9-third heat exchanger, 10-domestic hot water circulation assembly, 11-fan coil, 12-third circulation pipe, 13-solar collector, 14-fourth circulation pipe, 15-heat preservation water tank, 16-water supplement pipe, 17-fifth circulation pipe, 18-ground heating sub-collector, 19-sixth circulation pipe, 20-heat balance pipe, 21-buried pipe, 301-first pipe body, 302-second pipe body, 701-third pipe body, 702-fourth pipe body. DETAILED DESCRIPTION

[0026] The utility model will be further explained in connection with the drawings and examples below, but not as the basis for limiting the utility model.

[0027] Embodiment 1. A solar energy coupled heat recovery type heat pump triple generation system, constitutes as shown in Figures 1-3 The utility model discloses a solar energy coupled heat recovery type heat pump triple generation system, constitute as shown in the drawing, including first heat exchanger 1, the outside of first heat exchanger 1 is connected with refrigerant circulation subassembly, solar energy hot water circulation subassembly and domestic hot water circulation subassembly 10 respectively, the outside of refrigerant circulation subassembly is connected with air conditioning water circulation subassembly through second heat exchanger 2;The refrigerant circulation subassembly includes first circulation pipe 3, one side of first circulation pipe 3 is connected with first heat exchanger 1, and gas-liquid separator 4, compressor 5 and four-way valve 6 are connected in proper order on first circulation pipe 3, and the outside of four-way valve 6 is connected with second circulation pipe 7, and expansion valve 8 and third heat exchanger 9 are connected on second circulation pipe 7 respectively, and the outside of second circulation pipe 7 is connected with second heat exchanger 2.

[0028] Two side interfaces of the four-way valve 6 are connected with the first circulation pipe 3, and the remaining two side interfaces of the four-way valve 6 are connected with the second circulation pipe 7.

[0029] The first circulation pipe 3 is provided with parallel first pipe body 301 and second pipe body 302, an electromagnetic valve and the first heat exchanger 1 are connected in proper order on the first pipe body 301, and the electromagnetic valve is connected on the second pipe body 302.

[0030] The second circulation pipe 7 is provided with parallel third pipe body 701 and fourth pipe body 702, an electromagnetic valve and the second heat exchanger 2 are connected in proper order on the third pipe body 701, and the electromagnetic valve is connected on the fourth pipe body 702.

[0031] The first heat exchanger 1 is a positive displacement heat exchanger, and the domestic hot water circulation subassembly 10 is a domestic water inlet pipe and a domestic water outlet pipe connected with the first heat exchanger 1.

[0032] The third heat exchanger 9 is an air-refrigerant heat exchanger of an air-cooled heat pump unit, the refrigerant circulation subassembly is connected with a conventional air-cooled heat pump unit through the air-refrigerant heat exchanger, and then heat exchange of the refrigerant is utilized by the air-cooled heat pump unit.

[0033] The solar energy hot water circulation subassembly includes a solar energy collector 13, the outside of the solar energy collector 13 is connected with a heat preservation water tank 15 through a fourth circulation pipe 14, the outside of the heat preservation water tank 15 is connected with a water supplement pipe 16, and the heat preservation water tank 15 and the positive displacement heat exchanger are connected with each other through a fifth circulation pipe 17.

[0034] The outside of the first heat exchanger 1 is connected with a heating hot water circulation subassembly, and the heating hot water circulation subassembly includes a floor heating sub-collector 18, and the floor heating sub-collector 18 is connected with the first heat exchanger 1 through a sixth circulation pipe 19.

[0035] The air conditioner water circulation assembly comprises a fan coil 11, the outside of the fan coil 11 is connected with the second heat exchanger 2 through a third circulation pipe 12; the user can set the fan coil 11 as a two-pipe fan coil or a four-pipe fan coil according to the requirement; when the fan coil 11 is a four-pipe fan coil, the outside of the four-pipe fan coil is simultaneously connected with a sixth circulation pipe 19, and the sixth circulation pipe 19 is used for heat exchange of the first heat exchanger 1; when the fan coil 11 is a two-pipe fan coil, the fan coil 11 is not directly connected with the first heat exchanger 1.

[0036] The first heat exchanger 1 is respectively provided with a temperature sensor, a refrigerant heat exchange coil and a hot water heat exchange coil, the outside of the first heat exchanger 1 is covered with heat preservation material so as to have good heat preservation performance; the two ends of the refrigerant heat exchange coil are connected with a compressor 5 and a four-way valve 6 through a first circulation pipe 3; the outside of the hot water heat exchange coil is connected with a floor heating sub-collector 18 through the sixth circulation pipe 19.

[0037] The temperature sensor is arranged in the solar collector 13, the heat preservation water tank 15 and the first heat exchanger 1, and the liquid level sensor is arranged in the heat preservation water tank 15 and the first heat exchanger 1.

[0038] The circulation pump and the electromagnetic valve can be installed in each circulation pipe according to the flow route requirement of the system under different working conditions.

[0039] In use, the temperature sensor and the liquid level sensor are used to detect the temperature and the liquid level height of the heat preservation water tank 15 respectively, when the outlet water temperature of the solar collector 13 is higher than a threshold value and the heat preservation water tank 15 does not reach the full water level, water is injected into the heat preservation water tank 15 from the solar collector 13 through a water supplement pipe 16. When the water temperature in the heat preservation water tank 15 is lower than a threshold value and the outlet water temperature of the solar collector 13 is higher than a threshold value, the circulation pump is started to pump the water in the heat preservation water tank 15 into the solar collector 13, and the solar collector 13 is used to cyclically heat the water until the water temperature in the heat preservation water tank 15 reaches the threshold value. When the water level in the first heat exchanger 1 drops to a water supplement level, the heat preservation water tank 15 is preferentially used to supplement water for the first heat exchanger 1, and water is directly supplemented from the water supplement pipe 16 when the heat preservation water tank 15 is empty. If the water temperature in the heat preservation water tank 15 is lower than a threshold value or water is supplemented from the water supplement pipe 16, the refrigerant circulation assembly is started to heat the water in the first heat exchanger 1, so that the water temperature is kept in a constant range.

[0040] The user can take the hot water in the first heat exchanger 1 through the domestic hot water circulation assembly 10, and the floor heating sub-collector 18 can heat the floor heating circulation water through the first heat exchanger 1, so as to realize the application of the heat energy in the floor heating floor.

[0041] When the summer refrigeration working condition, the flow direction of the refrigerant is as follows: Figure 2As shown, the high-temperature refrigerant is sent into the first heat exchanger 1 by the compressor through the first pipe body 301, and the water in the first heat exchanger 1 is heated by the high-temperature refrigerant, so as to realize the recycling of the condensation heat of the air conditioner. After the refrigerant is discharged from the first heat exchanger 1, it enters the second circulating pipe 7 through the four-way valve 6, and is subjected to secondary heat exchange by the third heat exchanger 9, so that the refrigerant fully releases heat after twice heat exchange, and then passes through the expansion valve 8 and the second heat exchanger 2 along the second circulating pipe 7 in turn, so as to realize the phase change of the refrigerant by the expansion valve 8, and realize the heat exchange between the refrigerant and the air conditioner water by the second heat exchanger 2, thereby realizing the cooling function of the air conditioner water. After the heat exchange, the air conditioner water returns to the fan coil 11 through the third circulating pipe 12, and exchanges heat with the indoor air, thereby realizing the functions of refrigeration and dehumidification. After absorbing heat, the refrigerant returns to the suction port of the compressor through the four-way valve 6, the first circulating pipe 3 and the gas-liquid separator 4, thereby realizing the first cycle. Under the cooperation of the above, the embodiment can recycle the condensation heat generated by the fan coil 11 in the refrigeration process. If the water temperature of the first heat exchanger 1 is higher than the temperature of the refrigerant at the outlet of the compressor, the first pipe body 301 is closed and the second pipe body 302 is opened, so as to prevent the temperature of the high-temperature refrigerant from rising further after passing through the first heat exchanger 1.

[0042] In the winter heating condition, the hot water of the first heat exchanger 1 has two heat sources, at this time, the solar energy collector 13 is used to heat the produced hot water, and when the solar energy hot water is insufficient, the refrigerant cycle assembly is used to recycle the refrigerant condensation heat to heat the hot water in the first heat exchanger 1, so that the temperature is maintained within the threshold range. At this time, the flow direction of the refrigerant is as shown in the figure: Figure 3 As shown, the high-temperature refrigerant is sent into the first heat exchanger 1 by the compressor through the first pipe body 301, and the water in the first heat exchanger 1 is heated by the high-temperature refrigerant; the refrigerant is discharged from the outlet of the first heat exchanger 1, enters the expansion valve 8 through the four-way valve 6 and the fourth pipe body 702, and then enters the third heat exchanger 9 to absorb heat from outdoor air, and then returns to the suction port of the compressor 5 through the four-way valve 6, the first circulating pipe 3 and the gas-liquid separator 4 in turn, thereby completing a complete cycle. When heating indoors, the floor heating sub-collector 18 is used as the main heating body, and the floor heating circulating water is circulated between the floor heating sub-collector 18 and the first heat exchanger 1 through the sixth circulating pipe 19, so that the hot water of the first heat exchanger 1 is used as the heat source to heat the heating circulating hot water.

[0043] When the cooling and heating requirements exist simultaneously in the transition season, or the fan coil 11 is in the dehumidification working condition and the user does not want the air supply temperature to be too low, the working states of the refrigerant circulation assembly and the air conditioning water circulation assembly are the same as those in the refrigeration working condition, the heating hot water circulation assembly remains in the heating state, and the two run simultaneously to realize the function of cooling in part of the room and heating in part of the room; in the dehumidification working condition, the air conditioning water processes the indoor air to below the dew point temperature, the water in the air is condensed to produce condensate water, thereby realizing the indoor dehumidification function, and the heating hot water circulation assembly processes the low-temperature air to the air supply temperature comfortable for human bodies, thereby realizing the dehumidification working condition normal-temperature air supply, and improving the functionality and comfort of the system.

[0044] Embodiment 2. A tri-generation system of a solar energy coupled heat recovery type heat pump, which is composed of, as shown in Figure 4 a first heat exchanger 1, the outside of the first heat exchanger 1 is connected with a refrigerant circulation assembly, a solar hot water circulation assembly and a domestic hot water circulation assembly 10 respectively, the outside of the refrigerant circulation assembly is connected with an air conditioning water circulation assembly through a second heat exchanger 2; the refrigerant circulation assembly comprises a first circulation pipe 3, one side of the first circulation pipe 3 is connected with the first heat exchanger 1, the first circulation pipe 3 is connected with a gas-liquid separator 4, a compressor 5 and a four-way valve 6 in sequence, the outside of the four-way valve 6 is connected with a second circulation pipe 7, the second circulation pipe 7 is connected with an expansion valve 8 and a third heat exchanger 9 respectively, and the outside of the second circulation pipe 7 is connected with the second heat exchanger 2.

[0045] Two side interfaces of the four-way valve 6 are connected with the first circulation pipe 3, and the remaining two side interfaces of the four-way valve 6 are connected with the second circulation pipe 7.

[0046] The first circulation pipe 3 is provided with a first pipe body 301 and a second pipe body 302 connected in parallel, the first pipe body 301 is connected with an electromagnetic valve and the first heat exchanger 1 in sequence, and the second pipe body 302 is connected with an electromagnetic valve.

[0047] The second circulation pipe 7 is provided with a third pipe body 701 and a fourth pipe body 702 connected in parallel, the third pipe body 701 is connected with an electromagnetic valve and the second heat exchanger 2 in sequence, and the fourth pipe body 702 is connected with an electromagnetic valve.

[0048] The first heat exchanger 1 is a volumetric heat exchanger, and the domestic hot water circulation assembly 10 is a domestic water inlet pipe and a domestic water outlet pipe connected with the first heat exchanger 1 respectively.

[0049] The third heat exchanger 9 is a water-refrigerant heat exchanger, and the outside of the third heat exchanger 9 is connected with a buried pipe 21 of a ground source heat pump.

[0050] The solar water heating circulation assembly comprises a solar collector 13, the outside of the solar collector 13 is connected with a heat preservation water tank 15 through a fourth circulation pipe 14, the outside of the heat preservation water tank 15 is connected with a water supplement pipe 16, and the heat preservation water tank 15 and the volumetric heat exchanger are connected with each other through a fifth circulation pipe 17.

[0051] The outside of the first heat exchanger 1 is connected with a heating water circulation assembly, the heating water circulation assembly comprises a floor heating sub-collector 18, and the floor heating sub-collector 18 is connected with the first heat exchanger 1 through a sixth circulation pipe 19.

[0052] The air conditioning water circulation assembly comprises a fan coil 11, the outside of the fan coil 11 is connected with the second heat exchanger 2 through a third circulation pipe 12; the fan coil 11 can be set as a two-pipe fan coil or a four-pipe fan coil according to requirements; when the fan coil 11 is a four-pipe fan coil, the outside of the four-pipe fan coil is connected with the sixth circulation pipe 19 through a heat balance pipe 20, and the heat balance pipe 20 and the sixth circulation pipe 19 are used for heat exchange of the first heat exchanger 1; the outside of the heat balance pipe 20 is connected with a buried pipe 21 of a ground source heat pump; when the fan coil 11 is a two-pipe fan coil, the fan coil 11 is not directly connected with the first heat exchanger 1.

[0053] The first heat exchanger 1 is respectively provided with a temperature sensor, a refrigerant heat exchange coil and a hot water heat exchange coil, and the outside of the first heat exchanger 1 is coated with heat preservation material so as to have good heat preservation performance; the two ends of the refrigerant heat exchange coil are connected with a compressor 5 and a four-way valve 6 through a first circulation pipe 3; the outside of the hot water heat exchange coil is connected with the floor heating sub-collector 18 through the sixth circulation pipe 19.

[0054] The first heat exchanger 1 is respectively provided with a temperature sensor, a refrigerant heat exchange coil and a hot water heat exchange coil, and the outside of the first heat exchanger 1 is coated with heat preservation material so as to have good heat preservation performance; the two ends of the refrigerant heat exchange coil are connected with a compressor 5 and a four-way valve 6 through a first circulation pipe 3; the outside of the hot water heat exchange coil is connected with the floor heating sub-collector 18 through the sixth circulation pipe 19.

[0055] The solar collector 13, the heat preservation water tank 15 and the first heat exchanger 1 are respectively provided with temperature sensors, and the heat preservation water tank 15 and the first heat exchanger 1 are respectively provided with liquid level sensors.

[0056] Each circulation pipe can be provided with a circulation pump and an electromagnetic valve according to the flow route requirement of the system under different working conditions.

[0057] Compared with the embodiment 1, the air-cooled heat pump unit is replaced by a ground source heat pump system, and the third heat exchanger 9 is replaced by a water-refrigerant heat exchanger, so that the third heat exchanger 9 can discharge heat to the indoor side or the soil side according to the heat balance analysis result.

[0058] In the summer refrigeration working condition, the refrigerant can further release heat to the soil through the third heat exchanger 9 and the buried pipe 21 after releasing the condensation heat in the first heat exchanger 1. In the winter heating working condition, the refrigerant can absorb heat from the soil in the same way to heat the water in the first heat exchanger 1, thereby achieving the same cooling and heating effect as that of the embodiment 1.

[0059] Similarly, the air conditioning water of the four-pipe fan coil passes through the first heat exchanger 1 and the ground source heat pump in turn in the circulation process, and the first heat exchanger 1 and the ground source heat pump are used to exchange heat with the air conditioning water respectively, thereby ensuring the temperature stability of the air conditioning water after heat exchange.

[0060] By using the ground source heat pump system, the solar water circulation and the first heat exchanger 1 in combination, the annual heat balance can be achieved on the soil side, and compared with the existing ground source heat pump facilities, no cooling tower and other heat balance equipment need to be additionally arranged, thereby reducing the investment and the influence on the surrounding environment.

Claims

1. A tri-generation system of a solar energy coupled heat recovery type heat pump, characterized in that: The application relates to a heat exchange device, which comprises a first heat exchanger (1), the outside of the first heat exchanger (1) is connected with a refrigerant circulation assembly, a solar hot water circulation assembly and a domestic hot water circulation assembly (10) respectively, the outside of the refrigerant circulation assembly is connected with an air conditioning water circulation assembly through a second heat exchanger (2); the refrigerant circulation assembly comprises a first circulation pipe (3), one side of the first circulation pipe (3) is connected with the first heat exchanger (1), the first circulation pipe (3) is sequentially connected with a gas-liquid separator (4), a compressor (5) and a four-way valve (6), the outside of the four-way valve (6) is connected with a second circulation pipe (7), the second circulation pipe (7) is respectively connected with an expansion valve (8) and a third heat exchanger (9), and the outside of the second circulation pipe (7) is connected with the second heat exchanger (2).

2. The tri-generation system of claim 1, wherein: The first circulation pipe (3) is provided with a first pipe body (301) and a second pipe body (302) in parallel, an electromagnetic valve and the first heat exchanger (1) are sequentially connected on the first pipe body (301), and an electromagnetic valve is connected on the second pipe body (302).

3. The tri-generation system of claim 1, wherein: The second circulation pipe (7) is provided with a third pipe body (701) and a fourth pipe body (702) in parallel, an electromagnetic valve and the second heat exchanger (2) are sequentially connected on the third pipe body (701), and an electromagnetic valve is connected on the fourth pipe body (702).

4. The tri-generation system of claim 1, wherein: The first heat exchanger (1) is a volumetric heat exchanger.

5. The tri-generation system of claim 1, wherein: The third heat exchanger (9) is an air-refrigerant heat exchanger of an air-cooled heat pump unit.

6. The tri-generation system of claim 1, wherein: The third heat exchanger (9) is a water-refrigerant heat exchanger, and the outside of the third heat exchanger (9) is connected with a buried pipe (21) of a ground source heat pump.

7. The tri-generation system of claim 1, wherein: The air conditioning water circulation assembly comprises a fan coil (11), and the outside of the fan coil (11) is connected with the second heat exchanger (2) through a third circulation pipe (12).

8. The tri-generation system of claim 1, wherein: The solar hot water circulation assembly comprises a solar heat collector (13), the outside of the solar heat collector (13) is connected with an insulation water tank (15) through a fourth circulation pipe (14), the outside of the insulation water tank (15) is connected with a water supplement pipe (16), and the insulation water tank (15) and the volumetric heat exchanger are connected with each other through a fifth circulation pipe (17).

9. The tri-generation system of claim 1, wherein: The outside of the first heat exchanger (1) is connected with a heating hot water circulation assembly, and the heating hot water circulation assembly comprises a floor heating sub-collector (18), and the floor heating sub-collector (18) is connected with the first heat exchanger (1) through a sixth circulation pipe (19).

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