Solar coupling heat recovery type VRF triple co-generation system

Abstract

The utility model discloses a solar coupling heat recovery type VRF triple co-generation system which comprises a volumetric heat exchanger (1), and the exterior of the volumetric heat exchanger (1) is connected with a refrigerant circulation assembly, a solar hot water circulation assembly, a floor heating circulation assembly and a domestic hot water circulation assembly. The refrigerant circulation assembly comprises a refrigerant circulation main pipe (2), one end of the refrigerant circulation main pipe (2) is connected with an air conditioner indoor unit (5), the other end of the refrigerant circulation main pipe (2) is connected with a first refrigerant circulation branch pipe (6) and a heat exchange pipe (7), and the end of the first refrigerant circulation branch pipe (6) is connected with the air conditioner indoor unit (5). The utility model has the characteristics of multi-energy complementation and waste heat utilization, and can improve the utilization rate of heat energy produced by the solar heat collector and the system stability.

Description

Technical Field

[0001] This utility model relates to a building heating, cooling and hot water supply system, and in particular a solar-coupled heat recovery type VRF tri-generation system. Background Technology

[0002] A solar collector is a device that uses solar energy to heat water. Due to its advantages such as energy saving, high-quality hot water, and environmental friendliness, it is widely used as a heating system. Currently, solar collectors are often used in conjunction with a hot water tank. The hot water tank is connected to a tap water inlet to maintain a constant water level. When the water temperature in the tank falls below a threshold, a circulating water pump draws water from the tank into the solar collector, where it is heated to a specified temperature before being pumped back into the tank. This process keeps the water temperature constant, allowing users to draw and use the hot water at any time, achieving the desired heating effect.

[0003] However, solar water heating systems are constrained by sunlight and weather conditions, resulting in instability and making them unsuitable as the sole heat source. This is one of the main factors limiting their wider adoption. Secondly, this application method has a relatively limited function; after installation, the solar collector can only heat domestic water, leading to unnecessary heat loss during daily storage in the hot water tank and low heat utilization efficiency. Furthermore, when other facilities in the building's heating system require heat utilization or generate heat, the solar collector cannot coordinate with existing facilities to achieve centralized and coordinated heat utilization.

[0004] Therefore, existing heating systems based on solar collectors suffer from poor stability, limited functionality, and low thermal energy utilization. Utility Model Content

[0005] The purpose of this invention is to provide a solar-coupled heat recovery VRF tri-generation system. It features multi-energy complementarity and waste heat utilization, and can improve the utilization rate of the heat energy produced by the solar collector and the system stability.

[0006] The technical solution of this utility model is as follows: a solar-coupled heat recovery type VRF tri-generation system, including a volumetric heat exchanger, on the outside of which are respectively connected a refrigerant circulation component, a solar water heating circulation component, a floor heating circulation component, and a domestic hot water circulation component; the refrigerant circulation component includes a refrigerant circulation main pipe, one end of which is connected to an indoor air conditioning unit, and the other end of which is connected to a first refrigerant circulation branch pipe and a heat exchange pipe, the end of which is connected to the indoor air conditioning unit;

[0007] A gas-liquid separator and a compressor are connected in sequence to the main refrigerant circulation pipe; a volumetric heat exchanger is connected to the middle of the heat exchange pipe, and a four-way valve is connected to the end of the heat exchange pipe. One side of the four-way valve is connected to the main refrigerant circulation pipe via the second refrigerant circulation branch pipe, and the remaining two sides of the four-way valve are connected to the indoor unit of the air conditioner via the air conditioner heat exchange assembly.

[0008] The air conditioning heat exchange assembly includes a fourth circulation pipe connected to a four-way valve, the outside of the fourth circulation pipe is connected to the air conditioning indoor unit via a fifth circulation pipe, and a heat exchanger is connected to the middle of the fourth circulation pipe.

[0009] In the aforementioned solar-coupled heat recovery type VRF tri-generation system, the solar water heating circulation component includes a solar collector, an insulated water tank is connected to the outside of the solar collector via a first circulation pipe, a water supply pipe is connected to the outside of the insulated water tank, and the insulated water tank and the volumetric heat exchanger are connected to each other via a second circulation pipe.

[0010] In the aforementioned solar-coupled heat recovery type VRF tri-generation system, the domestic hot water circulation component includes a domestic water return pipe and a domestic water supply pipe respectively connected to a volumetric heat exchanger.

[0011] In the aforementioned solar-coupled heat recovery type VRF tri-generation system, the underfloor heating circulation component includes an underfloor heating manifold, and the underfloor heating manifold and the volumetric heat exchanger are interconnected via a third circulation pipe.

[0012] In the aforementioned solar-coupled heat recovery type VRF tri-generation system, the indoor unit of the air conditioner is equipped with an electronic expansion valve. The first end of the electronic expansion valve is connected to the gas-liquid separator through the refrigerant circulation main pipe, the second end of the electronic expansion valve is connected to the heat exchanger through the fifth circulation pipe and the fourth circulation pipe, and the third end of the electronic expansion valve is connected to the compressor through the first refrigerant circulation branch pipe.

[0013] In the aforementioned solar-coupled heat recovery type VRF tri-generation system, the fourth circulation pipe is provided with a first flow pipe and a second flow pipe connected in parallel. A solenoid valve is connected to the first flow pipe, and a solenoid valve and an expansion valve are connected to the first flow pipe in sequence.

[0014] In the aforementioned solar-coupled heat recovery type VRF tri-generation system, the volumetric heat exchanger is equipped with a temperature sensor, a refrigerant heat exchange coil, and a hot water heat exchange coil. The two ends of the refrigerant heat exchange coil are connected to the compressor and a four-way valve via heat exchange pipes, and the outside of the hot water heat exchange coil is connected to the underfloor heating manifold via a third circulation pipe.

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

[0016] (1) This utility model, through the structural cooperation of a volumetric heat exchanger, a solar water heating circulation component, a floor heating circulation component and a domestic hot water circulation component, enables the hot water generated by the solar collector after heating to be used as a heat source to fill the volumetric heat exchanger, so as to meet the hot water use needs in daily life. At the same time, it can be used as a heat source to exchange heat with the heat medium of the floor heating circulation component, thereby effectively improving the utilization rate and functionality of the heat energy produced by the solar collector.

[0017] (2) By limiting the structure of the refrigerant circulation component, the high-temperature refrigerant is discharged from the compressor and used as a heat source to exchange heat with the hot water in the volumetric heat exchanger, thereby realizing the utilization of the condensation heat of the VRF system, and forming a multi-energy complementary effect with the solar hot water circulation component, improving the system stability, and realizing the utilization of waste heat under the refrigeration condition.

[0018] (3) By coordinating the refrigerant first circulation branch pipe, heat exchange pipe and each circulation pipe, when the air conditioner indoor unit is under special operating conditions, a portion of the refrigerant enters the air conditioner indoor unit through the refrigerant circulation main pipe, volumetric heat exchanger, four-way valve, heat exchanger and fourth circulation pipe in sequence. Then, after the refrigerant undergoes phase change through the electronic expansion valve in the air conditioner indoor unit, it absorbs heat from the indoor air and lowers the air temperature to below the dew point temperature, thus achieving the dehumidification effect. Meanwhile, a portion of the refrigerant diverted from the compressor outlet enters the air conditioner indoor unit directly through the refrigerant first circulation branch pipe and exchanges heat with the dehumidified low-temperature air, thereby raising the air to a relatively comfortable supply air temperature, which improves the functionality and energy efficiency of the refrigerant circulation components.

[0019] Therefore, this utility model has the characteristics of multi-energy complementarity and waste heat utilization, and can improve the utilization rate of the heat energy produced by the solar collector and the system stability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a diagram showing the operating status of the refrigerant circulation component under summer cooling conditions.

[0022] Figure 3 This is a diagram showing the working status of the refrigerant circulation component during dehumidification and heating operations.

[0023] Figure 4 This is a diagram showing the working status of the refrigerant circulation component during winter heating.

[0024] The labels in the attached diagram are as follows: 1-Volume heat exchanger, 2-Refrigerant circulation main pipe, 3-Gas-liquid separator, 4-Compressor, 5-Air conditioner indoor unit, 6-First refrigerant circulation branch pipe, 7-Heat exchange pipe, 8-Four-way valve, 9-Second refrigerant circulation branch pipe, 10-Solar collector, 11-First circulation pipe, 12-Insulated water tank, 13-Make-up water pipe, 14-Second circulation pipe, 15-Domestic water return pipe, 16-Domestic water supply pipe, 17-Underfloor heating manifold, 18-Third circulation pipe, 19-Fourth circulation pipe, 20-Fifth circulation pipe, 21-Heat exchanger, 22-Expansion valve, 191-First flow pipe, 192-Second flow pipe. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0026] Example. A solar-coupled heat recovery VRF (Variable Regeneration and Cogeneration) system, configured as follows: Figure 1 As shown, the system includes a volumetric heat exchanger 1. A refrigerant circulation assembly, a solar water heating circulation assembly, a floor heating circulation assembly, and a domestic hot water circulation assembly are connected externally to the volumetric heat exchanger 1. The floor heating circulation assembly is a conventional low-temperature hot water floor radiant heating circulation assembly. The refrigerant circulation assembly includes a refrigerant circulation main pipe 2, on which a gas-liquid separator 3 and a compressor 4 are connected in sequence. One end of the refrigerant circulation main pipe 2 is connected to an indoor air conditioning unit 5, and the other end is connected to a first refrigerant circulation branch pipe 6 and a heat exchange pipe 7. The end of the first refrigerant circulation branch pipe 6 is connected to the indoor air conditioning unit 5. The middle of the heat exchange pipe 7 is connected to the volumetric heat exchanger 1, and the end of the heat exchange pipe 7 is connected to a four-way valve 8. One side of the four-way valve 8 is connected to the refrigerant circulation main pipe 2 via a second refrigerant circulation branch pipe 9, and the remaining two sides of the four-way valve 8 are connected to the indoor air conditioning unit 5 via the air conditioning heat exchange assembly.

[0027] A heat pump unit is installed on the volumetric heat exchanger 1, which is used to heat the water inside the volumetric heat exchanger 1.

[0028] The refrigerant used in the indoor unit 5 of the air conditioner is Freon.

[0029] The solar water heating circulation assembly includes a solar collector 10. An insulated water tank 12 is connected to the outside of the solar collector 10 via a first circulation pipe 11. A solar water heating circulation pump and a solenoid valve are installed inside the first circulation pipe 11. A water supply pipe 13 is connected to the outside of the insulated water tank 12, and a tap water pipe is connected to the outside of the water supply pipe 13. The insulated water tank 12 and the volumetric heat exchanger 1 are interconnected via a second circulation pipe 14. A circulating water pump is connected to the second circulation pipe 14, and the water supply pipe 13 is connected to the outside of the second circulation pipe 14 via a three-way valve. Temperature sensors are installed inside the solar collector 10, the insulated water tank 12, and the volumetric heat exchanger 1.

[0030] The domestic hot water circulation assembly includes a domestic water return pipe 15 and a domestic water supply pipe 16 that are respectively connected to the volumetric heat exchanger 1, and external water connection facilities for the domestic water return pipe 15 and the domestic water supply pipe 16, so as to extract and return hot water in the volumetric heat exchanger 1.

[0031] The underfloor heating circulation assembly includes an underfloor heating manifold 17, which is connected to the volumetric heat exchanger 1 via a third circulation pipe 18. The third circulation pipe 18 is equipped with an underfloor heating hot water circulation pump, thereby using the hot water in the volumetric heat exchanger 1 to exchange heat with the underfloor heating circulating water.

[0032] The indoor unit 5 of the air conditioner is equipped with an electronic expansion valve. The first end of the electronic expansion valve is connected to the gas-liquid separator 3 through the refrigerant circulation main pipe 2. The second end of the electronic expansion valve is connected to the heat exchanger 21 through the fifth circulation pipe 20 and the fourth circulation pipe 19. The third end of the electronic expansion valve is connected to the compressor 4 through the first circulation branch pipe 6 of the refrigerant.

[0033] The air conditioning heat exchange assembly includes a fourth circulation pipe 19 connected to the interfaces on both sides of the four-way valve 8. The outside of the fourth circulation pipe 19 is connected to the air conditioning indoor unit 5 via a fifth circulation pipe 20. A heat exchanger 21 is connected to the middle of the fourth circulation pipe 19. The heat exchanger 21 can be an air refrigerant heat exchanger.

[0034] The refrigerant circulation main pipe 2, the fifth circulation pipe 20, and the first refrigerant circulation branch pipe 6 are all equipped with solenoid valves at the end near the indoor unit 5 of the air conditioner. The fourth circulation pipe 19 and the heat exchange pipe 7 are also equipped with solenoid valves. The flow direction of the refrigerant under different operating conditions can be adjusted by opening and closing each solenoid valve.

[0035] The fourth circulation pipe 19 is provided with a first flow pipe 191 and a second flow pipe 192 connected in parallel. A solenoid valve is connected to the first flow pipe 191, and a solenoid valve and an expansion valve 22 are connected to the first flow pipe 191 in sequence.

[0036] The volumetric heat exchanger 1 is equipped with a temperature sensor, a refrigerant heat exchange coil and a hot water heat exchange coil. The two ends of the refrigerant heat exchange coil are connected to the compressor 4 and the four-way valve 8 via heat exchange pipe 7. The outside of the hot water heat exchange coil is connected to the underfloor heating manifold 17 via the third circulation pipe 18.

[0037] The hot water circulation and control method in this embodiment is as follows: the temperature sensor and the liquid level sensor detect the water temperature and liquid level in the insulated water tank 12 respectively. When the outlet water temperature of the solar collector 10 is higher than the threshold and the insulated water tank 12 is not full, the solenoid valve opens to allow municipal tap water to enter the solar collector 10 through the water supply pipe 13 and be heated to a certain temperature before being injected into the insulated water tank 12. When the insulated water tank 12 is full, its water temperature is lower than the threshold and the outlet water temperature of the solar collector 10 is higher than the threshold, the solar collector 10 is used to circulate and heat the water in the insulated water tank 12 until the water temperature in the insulated water tank 12 reaches the specified temperature.

[0038] When domestic hot water is used, the water level in the volumetric heat exchanger 1 drops. The insulated water tank 12 is used to replenish the heat exchanger 1, regardless of the water temperature. Only when the insulated water tank 12 is empty is the three-way valve switched to allow municipal tap water to directly replenish the heat exchanger 1. If the water temperature in the insulated water tank 12 is below a threshold during replenishment, the refrigerant circulation component is activated to further heat the hot water in the volumetric heat exchanger 1. Solar water is used as preheating for domestic hot water, thus maintaining the water temperature in the volumetric heat exchanger 1 within a constant range. The underfloor heating circulation component can heat its circulating water through the volumetric heat exchanger 1, thereby enabling the application of this heat energy in underfloor heating systems.

[0039] The hot water circulation and control method in this embodiment is as follows: When the refrigerant circulation component is started, the refrigerant circulation component can adjust its own working mode according to the operating conditions of the air conditioner. For example, when the room needs to be cooled and dehumidified in summer or plum rain season, the refrigerant circulation component is in cooling and dehumidification mode; when the room does not need to be cooled and dehumidified, the refrigerant circulation component is in heating mode.

[0040] When the refrigerant circulation assembly is in summer cooling mode, the refrigerant flow path is as follows: Figure 2 As shown, at this time, the refrigerant in the indoor unit 5 of the air conditioner is in a high-temperature state after absorbing heat indoors. Then, it enters the gas-liquid separator 3 and the compressor 4 in sequence along the refrigerant circulation main pipe 2, and then enters the volumetric heat exchanger 1 through the heat exchange pipe 7 to exchange heat with its hot water, thereby realizing the utilization of the condensation heat of the VRF system. After heat exchange, the refrigerant enters the heat exchanger 12 through the four-way valve 8 for further heat release, and then flows back to the indoor unit 5 of the air conditioner through the fourth circulation pipe 19 to realize the cooling function.

[0041] When the refrigerant circulation assembly is in dehumidification mode, the refrigerant flow path is as follows: Figure 3 As shown, after the refrigerant is discharged from the compressor 4, a portion of the refrigerant returns directly to the indoor unit 5 of the air conditioner via the first refrigerant circulation branch pipe 6, while the other portion operates under the same cooling conditions and performs a cooling function, thereby lowering the indoor air temperature below the dew point temperature. This causes condensation in the indoor air, achieving a dehumidification effect. Once the indoor air temperature decreases, the previously used high-temperature refrigerant exchanges heat with the low-temperature indoor air, heating it to a temperature relatively comfortable for the human body, thus achieving room-temperature dehumidification.

[0042] When the refrigerant circulation assembly is in winter heating mode, the refrigerant flow path is as follows: Figure 4 As shown, after the refrigerant is discharged from the compressor 4 outlet, it enters the volumetric heat exchanger 1 through the heat exchange pipe 7, thereby heating the hot water in the volumetric heat exchanger 1. This keeps the hot water in the volumetric heat exchanger 1 within a certain threshold and serves as a heat source to supply heat to the underfloor heating circulation components. After being discharged from the volumetric heat exchanger 1, the refrigerant passes sequentially through the four-way valve 8, the fifth circulation pipe 20, the fourth circulation pipe 19, and the second flow pipe 192 to reach the expansion valve 22, where it undergoes a phase change. After the phase change, the refrigerant enters the heat exchanger 21 and absorbs heat from the outdoor air. It then returns to the compressor 4 sequentially through the four-way valve 8, the second refrigerant circulation branch pipe 9, and the main refrigerant circulation pipe 2, and finally enters the indoor unit of the air conditioner through the first refrigerant circulation branch pipe 6, achieving the heating effect.

[0043] If some rooms need to adjust their indoor temperature during winter heating, a small portion of the refrigerant discharged from the compressor 4 returns directly to the indoor unit 5 of the air conditioner via the first refrigerant circulation branch pipe 6, heating the indoor temperature. Then, it enters the expansion valve 22 via the fourth circulation pipe 19 and the second flow pipe 192, where it undergoes a phase change. After the phase change, the refrigerant enters the heat exchanger 21 to absorb heat from the outside air, and then returns to the compressor 4 via the four-way valve 8, the second refrigerant circulation branch pipe 9, the main refrigerant circulation pipe 2, and the gas-liquid separator 3, without passing through the volumetric heat exchanger 1, thus ensuring the heating effect of the air conditioner.

Claims

1. A triple generation system of a solar energy coupled heat recovery type VRF, characterized by: It includes a volumetric heat exchanger (1), and the outside of the volumetric heat exchanger (1) is respectively connected to a refrigerant circulation assembly, a solar water heating circulation assembly, a floor heating circulation assembly and a domestic hot water circulation assembly; the refrigerant circulation assembly includes a refrigerant circulation main pipe (2), one end of the refrigerant circulation main pipe (2) is connected to an air conditioner indoor unit (5), and the other end of the refrigerant circulation main pipe (2) is respectively connected to a refrigerant first circulation branch pipe (6) and a heat exchange pipe (7), and the end of the refrigerant first circulation branch pipe (6) is connected to the air conditioner indoor unit (5); A gas-liquid separator (3) and a compressor (4) are connected in sequence to the refrigerant circulation main pipe (2); a volumetric heat exchanger (1) is connected to the middle of the heat exchange pipe (7), and a four-way valve (8) is connected to the end of the heat exchange pipe (7). One side of the four-way valve (8) is connected to the refrigerant circulation main pipe (2) via the second refrigerant circulation branch pipe (9), and the remaining two sides of the four-way valve (8) are connected to the air conditioning indoor unit (5) via the air conditioning heat exchange assembly. The air conditioning heat exchange assembly includes a fourth circulation pipe (19) connected to a four-way valve (8), the outside of the fourth circulation pipe (19) is connected to the air conditioning indoor unit (5) via a fifth circulation pipe (20), and a heat exchanger (21) is connected to the middle of the fourth circulation pipe (19).

2. The tri-generation system of claim 1, wherein: The solar water heating circulation assembly includes a solar collector (10), an insulated water tank (12) is connected to the outside of the solar collector (10) via a first circulation pipe (11), a water supply pipe (13) is connected to the outside of the insulated water tank (12), and the insulated water tank (12) and the volumetric heat exchanger (1) are connected to each other via a second circulation pipe (14).

3. The tri-generation system of claim 1, wherein: The domestic hot water circulation assembly includes a domestic water return pipe (15) and a domestic water supply pipe (16) that are respectively connected to the volumetric heat exchanger (1).

4. The tri-generation system of claim 1, wherein: The underfloor heating circulation assembly includes an underfloor heating manifold (17), and the underfloor heating manifold (17) and the volumetric heat exchanger (1) are interconnected via a third circulation pipe (18). 5.The triple generation system of a solar energy coupled heat recovery type VRF according to claim 1, characterized in that: The indoor unit (5) of the air conditioner is equipped with an electronic expansion valve. The first end of the electronic expansion valve is connected to the gas-liquid separator (3) through the refrigerant circulation main pipe (2). The second end of the electronic expansion valve is connected to the heat exchanger (21) through the fifth circulation pipe (20) and the fourth circulation pipe (19). The third end of the electronic expansion valve is connected to the compressor (4) through the first circulation branch pipe (6) of the refrigerant.

6. The tri-generation system of claim 1, wherein: The fourth circulation pipe (19) is provided with a first flow pipe (191) and a second flow pipe (192) connected in parallel. A solenoid valve is connected to the first flow pipe (191), and a solenoid valve and an expansion valve (22) are connected to the first flow pipe (191) in sequence.

7. A combined cooling, heating, and power (CCHP) system for solar-coupled heat recovery VRF as described in claim 4, characterized in that: The volumetric heat exchanger (1) is equipped with a temperature sensor, a refrigerant heat exchange coil and a hot water heat exchange coil. The two ends of the refrigerant heat exchange coil are connected to the compressor (4) and the four-way valve (8) via heat exchange pipe (7). The outside of the hot water heat exchange coil is connected to the underfloor heating manifold (17) via the third circulation pipe (18).

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