A cold water phase change heat storage solar coupled air source heat pump system

Abstract

A cold water phase change heat storage type solar energy coupled air source heat pump system belongs to the field of energy technology. The purpose of the invention is to propose a cold water phase change heat storage type solar energy coupled air source heat pump system, which uses fluorine circuit circulation to achieve solar energy and air source heat pump coupling, slow down the frosting phenomenon of air source heat pump and produce domestic hot water. The invention is suitable for solar collectors and cold water phase change heat storage devices to assist air source heat pump heating or cooling systems.

Description

Technical Field

[0001] The invention belongs to the field of energy technology, and in particular relates to a cold water phase change heat storage type solar energy coupled air source heat pump system. Background Art

[0002] As China's urbanization level continues to improve, the proportion of energy consumption in the urban construction sector in the country's total energy consumption is also increasing. The national building energy consumption accounts for more than 20% of the total energy consumption, of which heating and air-conditioning energy consumption accounts for more than 50% of the building energy consumption. Therefore, a new type of heating and cooling device with high efficiency and easy popularization has become an urgent need in today's energy field.

[0003] Although air source heat pumps have great development prospects, the problem of easy frost on the evaporator in the cold environment of northern regions has limited the large-scale use of air source heat pumps to a certain extent; the heating capacity of solar collectors is limited by seasons and the environment, and the daily heating capacity fluctuates greatly, making it difficult to use it alone as a stable heat source.

[0004] According to the search, there are technical solutions in the prior art that use solar energy and air source heat pumps to jointly operate to slow down the frosting of air source heat pumps and produce domestic hot water. However, the existing technical solutions have the following defects:

[0005] Patent application No. 201720150815.3 proposes a “heat storage type solar air collector and air source heat pump combined operation system” which uses air as the heating medium of the solar collector, and has low heating efficiency and poor heating effect.

[0006] Patent application No. 201720691214.7 proposed “an intelligently controlled solar energy and air source heat pump jointly operated centralized hot water supply system”, which uses a variety of detection devices to adjust the heat source utilization ratio, has a complex structure and a cumbersome control process. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the above-mentioned solar energy and air source heat pump joint operation scheme, and propose a cold water phase change heat storage type solar energy coupled air source heat pump system, which uses fluorine circuit circulation to achieve solar energy and air source heat pump coupling, slow down the frosting phenomenon of air source heat pump and produce domestic hot water. In addition, the cold water phase change heat storage device used in this scheme uses water as a phase change material, which reduces system investment while achieving multiple uses of one machine.

[0008] The present invention proposes a cold water phase change heat storage type solar energy coupled air source heat pump system, which comprises a heat exchanger 1, a heat exchanger 2, a compressor, a throttle valve, a solar collector, a phase change heat storage device, a liquid storage tank, a four-way valve 1, a four-way valve 2, an electronic valve, a gate valve, a main pipe 1, a main pipe 2, a branch pipe 1, a branch pipe 2, a branch pipe 3, a branch pipe 4, a branch pipe 5, a branch pipe 6, a phase change heat storage device water supply pipe, a phase change heat storage device return pipe, a heat exchanger 1 air inlet pipe, a heat exchanger The main pipe is connected to the heat exchanger 1 exhaust pipe, the heat exchanger 2 water supply pipe, and the heat exchanger 2 return pipe; one end of the main pipe is connected to the heat exchanger 2, and the other end is connected to the heat exchanger 1, and the throttle valve is arranged on the main pipe 1; one end of the main pipe 2 is connected to the heat exchanger 1, and the other end is connected to the heat exchanger 2; the four-way valve 1 is arranged on the main pipe 2, and the connection points are the a interface and the c interface of the four-way valve 1; one end of the branch pipe 1 is connected to the b interface of the four-way valve 1 The liquid storage tank is arranged on branch pipe one; one end of branch pipe two is connected to the compressor outlet, and the other end is connected to the d interface of four-way valve one; one end of branch pipe three is connected to main pipe one, and the connection point is located between the throttle valve and heat exchanger one, and the other end is connected to main pipe two, and the connection point is located between heat exchanger one and four-way valve one, and four-way valve two is arranged on branch pipe three, and the connection points are the a interface and c interface of four-way valve two; one end of branch pipe four is connected to the b interface of four-way valve two, and the other end is connected to the solar collector, and the electronic valve is arranged on branch pipe four; one end of branch pipe five is connected to the solar collector, and the other end is connected to the phase change heat storage device; one end of branch pipe six is ​​connected to the phase change heat storage device, and the other end is connected to the d interface of four-way valve two; the gate valve is arranged on the water supply pipe of the phase change heat storage device.

[0009] The phase change heat storage device is composed of a stainless steel shell, an upper end cover, a lower end cover, an upper partition, a lower partition, an internal capillary copper tube, a fluorine path inlet, a fluorine path outlet, a water path inlet, and a water path outlet.

[0010] The phase change heat storage device is characterized in that the gate valve is closed in winter, cold water is used as the phase change heat storage material, and it is used as a heat storage device; the gate valve is opened in summer, water flows in the phase change heat storage device, and the phase change heat storage device is used as a shell and tube heat exchanger.

[0011] The operating principle of the present invention is:

[0012] During daytime operation in winter, close the gate valve, open the electronic valve, connect the a interface of the four-way valve 1 to the b interface, connect the d interface to the c interface, connect the a interface of the four-way valve 2 to the d interface, connect the b interface to the c interface, start the compressor, and after the refrigerant flows out of the throttle valve, under the regulation of the electronic valve, part of the refrigerant flows into the heat exchanger 1 through the main pipe 1, exchanges heat with the air entering through the intake pipe of the heat exchanger 1, and then flows in through the main pipe 2 at the a interface of the four-way valve 1, flows out at the b interface of the four-way valve 1, flows into the liquid storage tank through the branch pipe 1, and then flows into the compressor through the compressor inlet and is compressed. The compressed refrigerant flows out through the branch pipe 2 at the d interface of the four-way valve 1 The refrigerant flows into the outlet, flows out at the c interface of the four-way valve one, flows into the heat exchanger two through the trunk pipe two, exchanges heat with the cooling water flowing in through the water supply pipe of the heat exchanger two, and the refrigerant after heat exchange returns to the throttle valve through the trunk pipe one; the other part of the refrigerant flows into the c interface of the four-way valve two through the branch pipe three at the connection point of the branch pipe three and the trunk pipe one, and then flows out at the b interface of the four-way valve two, flows into the solar collector through the branch pipe four, absorbs solar energy and fully exchanges heat, and then flows into the phase change heat storage device through the branch pipe five, and then flows into the d interface of the four-way valve two through the branch pipe six, flows out at the a interface of the four-way valve two, and flows into the trunk pipe two at the connection point of the branch pipe three and the trunk pipe two through the branch pipe three to carry out the next cycle.

[0013] During winter night operation, the refrigerant entering the phase change heat storage device through branch pipe 5 fully exchanges heat in the phase change heat storage device, absorbs the sensible heat and part of the latent heat of the water in the phase change heat storage device, and then flows into the d interface of the four-way valve 2 through branch pipe 6, flows out at the a interface of the four-way valve 2, and then flows into the trunk 2 through branch pipe 3 at the connection point between branch pipe 3 and trunk 2, and then performs the next cycle. During winter operation, the water in the phase change heat storage device does not flow, and the latent heat of water freezing and melting is used to realize cold water phase change heat storage.

[0014] During summer operation, open the gate valve, close the electronic valve, connect the a interface of the four-way valve one with the d interface, connect the b interface with the c interface, connect the a interface of the four-way valve two with the b interface, connect the c interface with the d interface, start the compressor, and the refrigerant flows out of the throttle valve, flows into the heat exchanger two through the main pipe one, exchanges heat with the intermediate water flowing in through the water supply pipe of the heat exchanger two, and then flows in through the main pipe two at the c interface of the four-way valve one, flows out at the b interface of the four-way valve one, flows into the liquid storage tank through the branch pipe one, and then flows into the compressor through the compressor inlet and is compressed. The compressed refrigerant flows into the d interface of the four-way valve one through the branch pipe two, flows out at the a interface of the four-way valve one, flows into the heat exchanger one through the main pipe two, and exchanges heat with the intermediate water flowing in through the air intake pipe of the heat exchanger one. The inflowing air exchanges heat, and the refrigerant after heat exchange returns to the throttle valve through the main pipe 1; when there is a demand for domestic hot water, the electronic valve is opened, and part of the refrigerant flows into the a interface of the four-way valve 2 through the branch pipe 3 at the connection point of the branch pipe 3 and the main pipe 2, and then flows out at the b interface of the four-way valve 2, flows into the solar collector through the branch pipe 4, absorbs solar energy and fully exchanges heat, and then flows into the phase change heat storage device through the branch pipe 5, heats the domestic water flowing in through the water supply pipe of the phase change heat storage device, and then flows into the d interface of the four-way valve 2 through the branch pipe 6, flows out at the c interface of the four-way valve 2, and then flows into the main pipe 1 through the branch pipe 3 at the connection point of the branch pipe 3 and the main pipe 1, and the next cycle is carried out, and the domestic water in the phase change heat storage device flows out through the return pipe of the phase change heat storage device. At this time, there is flowing water in the phase change heat storage device, which is actually a shell and tube heat exchange device.

[0015] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0016] 1. The present invention provides a solar collector refrigerant heating device, which utilizes solar energy to heat fluorine-circuit refrigerant, improves heat exchange efficiency, reduces the load of an air source heat pump evaporator, and realizes frost-free operation of the air source heat pump.

[0017] 2. The present invention provides a cold water phase change heat storage device, which uses water as a phase change material, fully utilizes the phase change latent heat of water, reduces equipment investment, and realizes stable operation of the system at night and in rainy weather.

[0018] 3. The present invention provides a solution for producing domestic hot water by coupling solar energy with an air source heat pump, which fully utilizes the high efficiency of solar collectors in summer and the waste heat of air source heat pumps, and realizes the year-round operation of the system without changing the existing devices of the system, thereby increasing the utilization rate of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the operation flow of the system of the present invention;

[0020] Figure 2 is a front view of the phase change heat storage device;

[0021] Figure 3is a front view cross-sectional view of a phase change heat storage device;

[0022] In the figure: heat exchanger 1-1, heat exchanger 2 1-2, compressor 2, throttle valve 3, solar collector 4, phase change heat storage device 5, liquid storage tank 6, four-way valve 1 7-1, four-way valve 2 7-2, electronic valve 8, gate valve 9, main pipe 1 10-1, main pipe 2 10-2, branch pipe 1 11-1, branch pipe 2 11-2, branch pipe 3 11-3, branch pipe 4 11-4, branch pipe 5 11-5, branch pipe 6 1 1-6, phase change heat storage device water supply pipe 12, phase change heat storage device return pipe 13, heat exchanger one air inlet pipe 14, heat exchanger one exhaust pipe 15, heat exchanger two water supply pipe 16, heat exchanger two return pipe 17, stainless steel shell 18, upper end cover 19, lower end cover 20, upper partition 21, lower partition 22, capillary copper tube 23, fluorine path inlet 24, fluorine path outlet 25, water path inlet 26, water path outlet 27. DETAILED DESCRIPTION

[0023] Specific implementation method 1, as Figure 1As shown, a cold water phase change heat storage type solar coupled air source heat pump system of the present embodiment comprises a heat exchanger 1-1, a heat exchanger 2 1-2, a compressor 2, a throttle valve 3, a solar collector 4, a phase change heat storage device 5, a liquid storage tank 6, a four-way valve 1 7-1, a four-way valve 2 7-2, an electronic valve 8, a gate valve 9, a main pipe 10-1, a main pipe 2 10-2, a branch pipe 1 11-1, a branch pipe 2 11-2, a branch pipe 3 11-3, a branch pipe 4 11-4, a branch pipe 5 11-5, a branch pipe 6 11-6, a phase change heat storage device water supply pipe 12, and a phase change heat storage device return pipe 1 3. The heat exchanger is composed of an air inlet pipe 14, an exhaust pipe 15, a water supply pipe 16, and a return pipe 17; one end of the main pipe 10-1 is connected to the heat exchanger 1-2, and the other end is connected to the heat exchanger 1-1. The throttle valve 2 is arranged on the main pipe 10-1; one end of the main pipe 10-2 is connected to the heat exchanger 1-1, and the other end is connected to the heat exchanger 1-2. The four-way valve 7-1 is arranged on the main pipe 10-2, and the connection points are the a interface and the c interface of the four-way valve 7-1; the branch pipe 11- One end of the branch pipe 1 is connected to the interface b of the four-way valve 17-1, and the other end is connected to the inlet of the compressor 3. The liquid storage tank 6 is arranged on the branch pipe 11-1; one end of the branch pipe 11-2 is connected to the outlet of the compressor 2, and the other end is connected to the interface d of the four-way valve 17-1; one end of the branch pipe 11-3 is connected to the main pipe 10-1, and the connection point is located between the throttle valve 2 and the heat exchanger 1-1, and the other end is connected to the main pipe 10-2, and the connection point is located between the heat exchanger 1-1 and the four-way valve 17-1. The four-way valve 17-2 is arranged on the branch pipe 11-3. 11-3, the connection points are the a interface and the c interface of the four-way valve 7-2; one end of the branch pipe 11-4 is connected to the b interface of the four-way valve 7-2, and the other end is connected to the solar collector 4, and the electronic valve 8 is arranged on the branch pipe 11-4; one end of the branch pipe 11-5 is connected to the solar collector 4, and the other end is connected to the phase change heat storage device 5; one end of the branch pipe 11-6 is connected to the phase change heat storage device 5, and the other end is connected to the d interface of the four-way valve 7-2; the gate valve 9 is arranged on the water supply pipe 12 of the phase change heat storage device.

[0024] Specific implementation method 2: Figures 2-3 As shown, the phase change heat storage device 5 described in the first specific embodiment is composed of a stainless steel shell 18, an upper end cover 19, a lower end cover 20, an upper partition 21, a lower partition 22, a capillary copper tube 23, a fluorine path inlet 24, a fluorine path outlet 25, a water path inlet 26, and a water path outlet 27.

[0025] Specific implementation method three: the phase change heat storage device 5 described in specific implementation method two closes the gate valve 9 in winter, uses cold water as the phase change heat storage material, and is used as a heat storage device; opens the gate valve 9 in summer, and water flows in the phase change heat storage device. At this time, the phase change heat storage device is used as a shell and tube heat exchanger.

[0026] Working principle:

[0027] During daytime operation in winter, the gate valve 9 is closed, the electronic valve 8 is opened, the a interface of the four-way valve 7-1 is connected to the b interface, the d interface is connected to the c interface, the a interface of the four-way valve 7-2 is connected to the d interface, the b interface is connected to the c interface, the compressor 2 is started, and after the refrigerant flows out of the throttle valve 3, under the regulation of the electronic valve 8, part of the refrigerant flows into the heat exchanger 1-1 through the main pipe 10-1, exchanges heat with the air entering through the heat exchanger intake pipe 14, and then flows into the a interface of the four-way valve 7-1 through the main pipe 10-2, flows out at the b interface of the four-way valve 7-1, flows into the liquid storage tank 6 through the branch pipe 11-1, and then flows into the compressor 2 through the compressor 2 inlet and is compressed. The compressed refrigerant flows into the d interface of the four-way valve 7-1 through the branch pipe 11-2, and flows out at the c interface of the four-way valve 7-1. The refrigerant flows out from the interface, flows into the heat exchanger 2 1-2 through the main pipe 10-2, exchanges heat with the cooling water flowing in through the water supply pipe 16 of the heat exchanger 2, and the refrigerant after heat exchange returns to the throttle valve 3 through the main pipe 10-1; the other part of the refrigerant flows into the c interface of the four-way valve 2 7-2 through the branch pipe 3 11-3 at the connection point between the branch pipe 3 11-3 and the main pipe 10-1, and then flows out at the b interface of the four-way valve 2 7-2, flows into the solar collector 4 through the branch pipe 4 11-4, absorbs solar energy and fully exchanges heat after flowing into the phase change heat storage device 5 through the branch pipe 5 11-5, and then flows into the d interface of the four-way valve 2 7-2 through the branch pipe 6 11-6, flows out at the a interface of the four-way valve 2 7-2, flows into the main pipe 2 10-2 at the connection point between the branch pipe 3 11-3 and the main pipe 2 10-2 through the branch pipe 3 11-3, and performs the next cycle.

[0028] During winter night operation, the refrigerant entering the phase change heat storage device 5 through the branch pipe 5 11-5 fully exchanges heat in the phase change heat storage device 5, absorbs the sensible heat and part of the latent heat of the water in the phase change heat storage device 5, and then flows into the d interface of the four-way valve 2 7-2 through the branch pipe 6 11-6, flows out at the a interface of the four-way valve 2 7-2, and then flows into the trunk pipe 2 10-2 through the branch pipe 3 11-3 at the connection point between the branch pipe 3 11-3 and the trunk pipe 2 10-2, and performs the next cycle. During winter operation, the water in the phase change heat storage device 5 does not flow, and the latent heat of water freezing and melting is used to realize cold water phase change heat storage.

[0029] During summer operation, the gate valve 9 is opened, the electronic valve 8 is closed, the a interface of the four-way valve 7-1 is connected to the d interface, the b interface is connected to the c interface, the a interface of the four-way valve 7-2 is connected to the b interface, the c interface is connected to the d interface, the compressor 2 is started, and the refrigerant flows out of the throttle valve 3, flows into the heat exchanger 1-2 through the main pipe 10-1, exchanges heat with the intermediate water flowing in through the heat exchanger 2 water supply pipe 16, and then flows into the c interface of the four-way valve 7-1 through the main pipe 10-2, flows out at the b interface of the four-way valve 7-1, flows into the liquid storage tank 6 through the branch pipe 11-1, and then flows into the compressor 2 through the compressor 2 inlet and is compressed. The compressed refrigerant flows into the d interface of the four-way valve 7-1 through the branch pipe 11-2, flows out at the a interface of the four-way valve 7-1, flows into the heat exchanger 1-1 through the main pipe 11-2, and exchanges heat with the air flowing in through the heat exchanger 1 intake pipe 14. Heat exchange is carried out, and the refrigerant after heat exchange returns to the throttle valve 3 through the main pipe 10-1; when there is a demand for domestic hot water, the electronic valve 8 is opened, and part of the refrigerant flows into the a interface of the four-way valve 2 7-2 through the branch pipe 3 11-3 at the connection point of the branch pipe 3 11-3 and the main pipe 2 10-2, and then flows out at the b interface of the four-way valve 2 7-2, flows into the solar collector 4 through the branch pipe 4 11-4, absorbs solar energy and fully exchanges heat, and flows into the phase change heat storage device 5 through the branch pipe 5 11-5, heats the domestic water flowing in through the water supply pipe 12 of the phase change heat storage device, and then flows into the d interface of the four-way valve 2 7-2 through the branch pipe 6 11-6, flows out at the c interface of the four-way valve 2 7-2, and then flows into the main pipe 10-1 through the branch pipe 3 11-3 at the connection point of the branch pipe 3 11-3 and the main pipe 10-1, and the next cycle is carried out, and the domestic water in the phase change heat storage device 5 flows out through the return pipe 13 of the phase change heat storage device. At this time, there is flowing water in the phase change heat storage device, which is actually a shell and tube heat exchange device.

[0030] The above description is only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above description. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A cold water phase change heat storage solar energy coupled air source heat pump system, characterized in that: It consists of a heat exchanger 1 (1-1), a heat exchanger 2 (1-2), a compressor (2), a throttle valve (3), a solar collector (4), a phase change heat storage device (5), a liquid storage tank (6), The invention is composed of a four-way valve 1 (7-1), a four-way valve 2 (7-2), an electronic valve (8), a gate valve (9), a main pipe 1 (10-1), a main pipe 2 (10-2), a branch pipe 1 (11-1), a branch pipe 2 (11-2), a branch pipe 3 (11-3), a branch pipe 4 (11-4), a branch pipe 5 (11-5), a branch pipe 6 (11-6), a phase change heat storage device water supply pipe (12), a phase change heat storage device water return pipe (13), a heat exchanger 1 air intake pipe (14), a heat exchanger 1 exhaust pipe (15), a heat exchanger 2 water supply pipe (16), and a heat exchanger 2 water return pipe (17); one end of the main pipe 1 (10-1) is connected to the heat exchanger 2 (1-2), and the other end is connected to the heat exchanger 1 (1-1); the throttle valve (3) is arranged on the main pipe 1 (10-1). On the main pipe 2 (10-2); one end of the main pipe 2 (10-2) is connected to the heat exchanger 1 (1-1), and the other end is connected to the heat exchanger 2 (1-2); the four-way valve 1 (7-1) is arranged on the main pipe 2 (10-2), and the connection points are the a interface and the c interface of the four-way valve 1 (7-1); one end of the branch pipe 1 (11-1) is connected to the b interface of the four-way valve 1 (7-1), and the other end is connected to the inlet of the compressor (2), The liquid storage tank (6) is arranged on the branch pipe 1 (11-1); one end of the branch pipe 2 (11-2) is connected to the outlet of the compressor (2), and the other end is connected to the d interface of the four-way valve 1 (7-1); one end of the branch pipe 3 (11-3) is connected to the main pipe 1 (10-1), and the connection point is located between the throttle valve (3) and the heat exchanger 1 (1-1), and the other end is connected to the main pipe 2 (10-2), and the connection point is located between the heat exchanger 1 (1-1) and the four-way valve 1 (7-1); the four-way valve 2 (7-2) is arranged on the branch pipe 3 (11-3), and the connection points are the a interface and the c interface of the four-way valve 2 (7-2); one end of the branch pipe 4 (11-4) is connected to the b interface of the four-way valve 2 (7-2), and the other end is connected to the solar collector (4); the electronic valve (8) is arranged on the branch pipe 4 (11-4); One end of the branch pipe five (11-5) is connected to the solar collector (4), and the other end is connected to the phase change heat storage device (5); one end of the branch pipe six (11-6) is connected to the phase change heat storage device (5), and the other end is connected to the d interface of the four-way valve two (7-2); the gate valve (9) is arranged on the water supply pipe (12) of the phase change heat storage device; in winter, the gate valve (9) is closed, and cold water is used as the phase change heat storage material to be used as the heat storage device; in summer, the gate valve (9) is opened, and water flows in the phase change heat storage device. At this time, the phase change heat storage device (5) is used as a shell and tube heat exchanger.

2. A cold water phase change thermal storage solar coupled air source heat pump system according to claim 1, characterized in that The phase change heat storage device (5) is composed of a stainless steel shell (18), an upper end cover (19), a lower end cover (20), an upper baffle (21), a lower baffle (22), an internal capillary copper tube (23), a fluorine path inlet (24), a fluorine path outlet (25), a water path inlet (26), and a water path outlet (27).

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