CN201149400Y - A solution-based air source/water-cooled heat pump device - Google Patents

Abstract

The solution-based air source/water-cooled heat pump device relates to a new type of heat pump heating method based on solution absorbing heat from the air and a device for realizing this method. The device includes a refrigerant circulation loop and a solution circulation loop; the refrigerant circulation The circuit includes compressor, two solenoid valves, regenerator, four-way valve, first heat exchanger, four one-way valves, liquid reservoir, filter, electronic expansion valve, second heat exchanger, gas-liquid separator and its connecting pipes; the solution circuit includes a cooling tower, a solution reservoir, three hand valves, a variable frequency pump, an electric three-way regulating valve, a regenerator, a second heat exchanger and its connecting pipes; it solves the problem of idle water-cooled chillers in winter, Air source heat pumps have low cooling performance in summer (compared with water-cooled chillers), and there is a problem of frosting in winter operation. device.

Description

A solution-based air source/water-cooled heat pump device

technical field

The utility model relates to a novel heat pump heating method based on solution absorbing heat from the air and a device for realizing the method, which belongs to the technical field of refrigeration and air-conditioning system design and manufacture.

Background technique

With the rapid development of the national economy and the continuous improvement of people's living standards, people have higher and higher requirements for the comfort of living and working environments. Air conditioning has become an indispensable necessity for people's normal life, work and study. The central air-conditioning system of existing buildings mostly uses water-cooled chillers for cooling in summer. In winter, the water-cooled chillers stop using because they cannot heat, resulting in a large number of idle equipment. At the same time, the central air-conditioning system adopts a boiler heating scheme for heating, but this increases the initial investment and heating costs, and also causes environmental pollution.

The central air-conditioning system heating in winter can also adopt the air source heat pump heating scheme. The air source heat pump can provide cold water in summer and produce hot water in winter. When the air source heat pump produces cold water in summer, because it adopts air cooling, the coefficient of performance is much smaller than that of the water-cooled chiller, and the operating cost is much higher than that of the water-cooled chiller. At the same time, when the air source heat pump is in heating operation in winter, there is a problem of frosting on the surface of the evaporator of the unit. With the operation of the unit under frosting conditions, the frost layer on the surface of the evaporator will become thicker and thicker. The heat transfer resistance between the refrigerant and the air in the evaporator is reduced, and the frost layer becomes thicker, which reduces the air circulation area of the evaporator and reduces the air flow through the evaporator, which leads to the deterioration of the heat transfer of the evaporator and reduces the The coefficient of performance of the heat pump system may even make the heat pump unable to operate normally. Therefore, the unit needs to be defrosted. And the defrosting of the unit from time to time leads to a decrease in the heating efficiency and heating time of the heat pump system.

Therefore, to solve the problems of idle equipment waste in water-cooled chillers in winter, the low cooling performance coefficient of air source heat pumps in summer (compared with water-cooled chillers), and the existence of frost in winter operation, a new type of high-efficiency refrigeration and heating air-conditioning system has been designed. Those skilled in the art urgently need to solve the technical problems.

Contents of the invention

Technical problem: The purpose of this utility model is to solve the problems that the water-cooled chiller is idle in winter, the cooling performance coefficient of the air source heat pump is low in summer (compared with the water-cooled chiller), and there is frosting in winter operation, and a new type of summer water-cooled refrigeration is proposed. , A solution-based air source/water-cooled heat pump device that absorbs heat from the air with the help of a solution in winter.

Technical solution: In the solution-based air source/water-cooled heat pump device of the present invention, the system includes a refrigerant circulation loop and a solution circulation loop. The refrigerant circulation circuit includes a compressor, a first solenoid valve, a second solenoid valve, a regenerator, a four-way valve, a first heat exchanger, a first one-way valve, a second one-way valve, a third one-way valve, a Four one-way valves, liquid reservoirs, filters, electronic expansion valves, second heat exchangers, gas-liquid separators and related connecting pipes. The output end of the compressor is divided into two paths, one path is connected to the input end a of the regenerator through the first electromagnetic valve, and the other path is connected to the input end a of the four-way valve after being combined with the output end b of the regenerator through the second electromagnetic valve. The output end b of the valve is connected to the input end a of the first heat exchanger, and the output end b of the first heat exchanger is connected to the input end of the liquid reservoir through the first one-way valve, and the output end b of the first heat exchanger is also The first one-way valve and the second one-way valve are connected to the input end a of the second heat exchanger, the output end of the liquid reservoir is connected to the input end of the electronic expansion valve through the filter, and the output end of the electronic expansion valve is connected through the fourth one-way valve The valve is connected to the input end a of the second heat exchanger, and the output end of the electronic expansion valve is also connected to the output end b of the first heat exchanger through the third one-way valve, and the output end b of the second heat exchanger is connected to the four-way valve The input terminal c of the four-way valve is connected to the input terminal of the gas-liquid separator, and the output terminal of the gas-liquid separator is connected to the input terminal of the compressor; the solution loop includes a cooling tower, a solution reservoir, a first-hand valve, second hand valve, third hand valve, variable frequency pump, electric three-way regulating valve, regenerator, second heat exchanger and related connecting pipes. The outlet of the cooling tower is divided into two paths, one path is connected to the inlet of the solution reservoir through the first hand valve, the outlet of the solution reservoir is connected to the inlet of the frequency conversion pump through the third hand valve, and the other path is also connected to the inlet of the frequency conversion pump through the second hand valve . The outlet of the variable frequency pump is connected to the electric three-way regulating valve, one of the electric three-way regulating valves is connected to the solution input port c of the regenerator, and the other one is combined with the solution output port d of the regenerator and then connected to the solution input port c of the second heat exchanger. The solution output port d of the second heat exchanger is connected with the input port of the cooling tower.

The air source solution type heat pump of the utility model includes two circulation loops: a refrigerant circulation loop and a solution circulation loop. Concrete method of the present utility model is:

When the air source solution type heat pump is in cooling operation in summer, the refrigerant circulation circuit is a low-temperature and low-pressure refrigerant gas, which is sucked by the compressor from the gas-liquid separator, compressed and becomes high-temperature and high-pressure superheated steam, and then discharged through the second solenoid valve and the four-way valve. The valve enters the second heat exchanger, the refrigerant releases heat, condenses to become a liquid, and then turns into a low-temperature and low-pressure gas-liquid two-phase after passing through the second one-way valve, liquid receiver, filter, and electronic expansion valve in sequence. After passing through the third one-way valve, it enters the first heat exchanger. The refrigerant absorbs heat and evaporates in the first heat exchanger to produce cold water. The through valve enters the gas-liquid separator, and then is sucked into the compressor again to complete the refrigeration cycle and produce cold water. At this time, the solution circulation circuit is filled with cooling water except the solution reservoir, and the solution is stored in the solution reservoir and does not participate in the circulation of the solution circuit. After the cooling water comes out of the cooling tower in the solution circulation circuit, it directly enters the frequency conversion pump through the second hand valve. After being pressurized by the frequency conversion pump, the cooling water enters the electric three-way regulating valve, and the electric three-way regulating valve is all closed to enter the regenerator. Flow rate, the cooling water directly enters the second heat exchanger without passing through the regenerator, absorbs heat and condenses the refrigerant into a liquid, and enters the cooling tower after its own temperature rises to perform heat and moisture exchange with the air. flow out.

When the air source solution type heat pump is running for heating in winter, the refrigerant circulation loop is the low-temperature and low-pressure refrigerant gas in the gas-liquid separator, which is sucked by the compressor, compressed and discharged into the regenerator through the first electromagnetic valve, and the refrigerant in the regenerator Release heat to regenerate the dilute solution. By controlling the electric three-way regulating valve to adjust the flow of the dilute solution into the regenerator, it can ensure that the refrigerant only releases sensible heat in the regenerator, and the temperature is lowered without condensation. The refrigerant gas flows from the regenerator. It comes out and enters the first heat exchanger through the four-way valve. The refrigerant releases heat in the first heat exchanger to produce hot water. At the same time, it condenses itself into a liquid, and then passes through the first one-way valve, liquid receiver, and filter in sequence. , electronic expansion valve, after being throttled and depressurized by the electronic expansion valve, the gas-liquid two-phase passes through the fourth one-way valve and enters the second heat exchanger, where it evaporates and absorbs heat. After the refrigerant is completely evaporated From the second heat exchanger, it flows through the four-way valve into the gas-liquid separator, and finally is sucked into the compressor again, and is recompressed to participate in the cycle. At this time, the solution circulation circuit is filled with solution. After coming out of the cooling tower, the solution enters the solution reservoir through the first hand valve, and then enters the frequency conversion pump after passing through the third hand valve. The solution enters the electric tee after being pressurized by the frequency conversion pump. Regulating valve, the solution is divided into two parts, one part enters the regenerator, the solution evaporates water in it, and the concentration increases. After the solution is regenerated, it is mixed with another part of the solution and enters the second heat exchanger to exchange heat with the refrigerant to release heat. The temperature of itself decreases, and the solution enters the cooling tower after coming out of the second heat exchanger. The solution with high concentration and low temperature (the temperature of the solution is lower than the temperature of the air, and the partial pressure of water vapor in the solution is less than or equal to the partial pressure of water vapor in the air) in the cooling tower Heat and moisture exchange with the air, the solution absorbs heat from the air, the water vapor in the air condenses into the solution, the temperature of the solution rises, the concentration decreases, and then flows out from the cooling tower to participate in the cycle again.

Beneficial effects: the air source solution type heat pump proposed by the utility model can realize the function of a water-cooled chiller in summer, and has a higher performance coefficient than an air-cooled chiller.

The air source solution type heat pump can realize heating in winter, which solves the problem that the original chiller equipment is idle in winter, improves the utilization rate of the equipment, and reduces the initial investment.

Compared with the existing air source heat pump, the air source solution heat pump has a higher performance coefficient under the same ambient temperature.

Compared with the existing air source heat pump, the air source solution type heat pump will not frost on the surface of the evaporator when it is running in winter, which completely solves the inevitable frosting problem of the air source heat pump, and improves the performance coefficient and heating efficiency of the heat pump , while increasing system life and reliability.

Description of drawings

Accompanying drawing 1 is the schematic diagram of the air source/water-cooled heat pump device based on the solution of the present invention.

In the above figure, there are: compressor 1; first solenoid valve 2; second solenoid valve 3; regenerator 4; four-way valve 5; first heat exchanger 6; cold or hot water inlet 61; cold or hot water outlet 62 The first one-way valve 7; the second one-way valve 8; the reservoir 9; the filter 10; the electronic expansion valve 11; the third one-way valve 12; the fourth one-way valve 13; Gas-liquid separator 15; cooling tower 16; first hand valve 17; second hand valve 18; third hand valve 19; solution reservoir 20; frequency conversion pump 21;

Detailed ways

The specific embodiment of the utility model is further described in conjunction with accompanying drawing 1: the air source solution type heat pump of the present invention includes a refrigerant circulation loop and a solution circulation loop; the specific connection method is that the output end of the compressor 1 is divided into two paths, and one path passes through the first One electromagnetic valve 2 is connected to the input end a of the regenerator 4, and the other is connected to the input end a of the four-way valve 5 after the second electromagnetic valve 3 is combined with the output end b of the regenerator 4, and the output end b of the four-way valve 5 is connected to The input end a of the first heat exchanger 6, the output end b of the first heat exchanger 6 are connected to the input end of the liquid reservoir 9 through the first one-way valve 7, and the output end b of the first heat exchanger 6 is also passed through The first one-way valve 7 and the second one-way valve 8 are connected to the input end a of the second heat exchanger 14, the output end of the liquid reservoir 9 is connected to the input end of the electronic expansion valve 11 through the filter 10, and the input end of the electronic expansion valve 11 The output end is connected to the input end a of the second heat exchanger 14 through the fourth one-way valve 13, and the output end of the electronic expansion valve 11 is also connected to the output end b of the first heat exchanger 6 through the third one-way valve 12. The output end b of the second heat exchanger 14 is connected to the input end c of the four-way valve 5, the output end d of the four-way valve 5 is connected to the input end of the gas-liquid separator 15, and the output end of the gas-liquid separator 15 is connected to the compressor 1 the input terminal;

The outlet of the cooling tower 16 is divided into two paths, one path is connected to the inlet of the solution reservoir 20 through the first hand valve 17, the outlet of the solution reservoir 20 is connected to the inlet of the frequency conversion pump 21 through the third hand valve 19, and the other path is connected to the second hand valve 18 also connects the inlet of variable frequency pump 21. The outlet of the variable frequency pump 21 is connected to the inlet of the electric three-way regulating valve 22, and one outlet of the electric three-way regulating valve 22 is connected to the solution input port c of the regenerator 4, and the other one outlet is combined with the solution output port d of the regenerator 4 to connect to the second heat exchange The solution input port c of the device 14 and the solution output port d of the second heat exchanger 14 are connected with the input port of the cooling tower 16 .

During cooling operation in summer: the low-temperature and low-pressure refrigerant gas coming out of the gas-liquid separator 15 is compressed by the compressor 1, discharged, and enters the second solenoid valve 3 (the first solenoid valve 2 is closed at this time) and the four-way valve 5 to enter the second solenoid valve 3. The second heat exchanger 14 exchanges heat with the cooling water, the refrigerant condenses and releases heat to become a liquid, and then passes through the second check valve 8, the liquid receiver 9, the filter 10, and the electronic expansion valve 11 in turn, and then is throttled to a low temperature The low-pressure gas-liquid two-phase enters the first heat exchanger 6 through the third one-way valve 12. The refrigerant absorbs heat and evaporates in the first heat exchanger 6 to produce cold water. After the refrigerant is completely evaporated, it becomes superheated gas from The first heat exchanger 6 comes out and enters the gas-liquid separator 15 through the four-way valve 5, and is sucked into the compressor 1 again for compression to complete the refrigeration cycle and produce cold water. At this time, the solution circulation circuit is filled with cooling water except the solution reservoir 20, and the solution is stored in the solution reservoir 20, and does not participate in the circulation of the solution circuit. After the cooling water is cooled by the cooling tower in the solution circulation circuit, it comes out of the cooling tower 16 and directly enters the frequency conversion pump 21 through the second hand valve 18 (at this time, the first hand valve 17 and the third hand valve 19 are closed), and passes through the frequency conversion pump After 21 is pressurized, the water enters the electric three-way regulating valve 22. At this time, the electric three-way regulating valve 22 completely closes the flow into the regenerator 4, and the cooling water directly enters the second heat exchanger 14 without passing through the regenerator 4 to be mixed with the refrigerant. Perform heat exchange, absorb heat, condense the refrigerant into liquid, increase its own temperature, and then enter the cooling tower 16 to exchange heat with air, while the temperature decreases.

Air-source solution heat pump heating operation in winter: the low-temperature and low-pressure refrigerant vapor returned from the gas-liquid separator 15 is compressed by the compressor 1 and becomes a high-temperature and high-pressure superheated vapor, which is discharged by the compressor 1 and enters through the first solenoid valve 2 Regenerator 4 (at this moment, the second electromagnetic valve 3 is closed), and the high-temperature and high-pressure refrigerant vapor releases a part of heat in the regenerator 4 (mainly the sensible heat of the high-temperature discharge of the refrigerant from the compressor 1) to the dilute solution in the regenerator 4. Regeneration, while the refrigerant cools down, by controlling the flow rate of the dilute solution entering the regenerator 4, the refrigerant only cools down in the regenerator 4 without condensing, and the refrigerant gas comes out of the regenerator 4 and enters the first heat exchange through the four-way valve 5 6, the refrigerant releases heat in the first heat exchanger 6 and condenses into a liquid, and at the same time hot water is produced, and the refrigerant liquid then passes through the first one-way valve 7, the liquid receiver 9, the filter 10, and the electronic expansion valve in sequence 11. After throttling and decompression by the electronic expansion valve 11, the gas-liquid two-phase enters the second heat exchanger 14 through the fourth check valve 13, and exchanges heat with the solution in the second heat exchanger 14, and the refrigerant absorbs The heat of the solution evaporates and turns into a gas. After the refrigerant is completely evaporated, it comes out of the second heat exchanger 14 and enters the gas-liquid separator 15 through the four-way valve 5, and finally is sucked by the compressor 1 again, and recompressed to participate in the cycle.

When heating, the solution circuit is full of solution, and the solution performs heat and moisture exchange with the air in the cooling tower 16. By controlling the temperature of the solution to be lower than the temperature of the air and adjusting the concentration of the solution, the partial pressure of water vapor in the solution is less than or equal to that of water in the air. The vapor partial pressure ensures that the solution can absorb heat from the cooling tower 16 air. After the solution comes out of the cooling tower 16, it enters the solution reservoir 20 through the first hand valve 17 (at this moment, the second hand valve 18 is closed), and then enters the frequency conversion pump 21 after passing through the third hand valve 19, and the solution is pressurized by the frequency conversion pump 21 After entering the electric three-way regulating valve 22, the solution is divided into two parts, and a part of the solution enters the regenerator 4, where the solution evaporates water, and the concentration increases to realize regeneration. After the concentrated solution comes out of the regenerator, it is mixed with another part of the solution and enters the second exchange The heat exchanger 14 exchanges heat with the refrigerant, the solution releases heat, and its own temperature decreases. After the solution comes out of the second heat exchanger, it enters the cooling tower 16, and again performs heat and moisture exchange with the air in the cooling tower 16. The temperature decreases and the concentration decreases. small, thus recirculating.

The key for the solution to absorb heat from the air in the cooling tower is: 1. Ensure that the minimum temperature of the solution participating in the circulation is higher than the freezing point temperature of the solution, so as to ensure that the solution will not freeze during the operation of the heat pump. , the concentration of the solution injected into the solution circulation loop can be realized; 2, the temperature of the solution entering the cooling tower is lower than the air temperature, thereby ensuring that the heat is passed to the solution from the air, the present invention controls the frequency of the variable frequency pump (that is, controls the rotating speed of the variable frequency pump) Adjust the flow rate of the solution entering the second heat exchanger to ensure that the temperature of the solution entering the cooling tower is lower than the air temperature (when the solution temperature is high, reduce the flow rate of the solution, and when the temperature of the solution is too low, increase the flow rate of the solution); 3. Water in the solution The steam partial pressure is less than or equal to the water vapor partial pressure in the air, so that water vapor enters the solution from the air, and the water vapor condenses and releases heat to the solution (the partial pressure difference of water vapor is the driving force for water vapor diffusion), when the solution temperature is constant The partial pressure of water vapor in the solution depends on the concentration of the solution, and controlling the concentration of the solution can also realize the control of the partial pressure of water vapor in the solution. The present invention adjusts the flow rate of the solution entering the regenerator by controlling the electric three-way regulating valve, thereby realizing the control of the solution concentration. When the solution concentration is small, the regeneration amount of the solution in the regenerator is increased, and when the solution concentration is large, the solution in the regenerator is reduced. Amount of regeneration.

When the winter heating operation is switched to the summer cooling operation, all the solution in the solution circuit can be recovered to the solution reservoir, and after closing the first hand valve and the third hand valve, the solution circuit can be filled with water. When the summer cooling operation is switched to the winter heating operation, drain the cooling water in the original solution circuit, close the second hand valve, open the first hand valve and the third hand valve, and release the solution in the solution reservoir.

Claims (4)

1. A solution-based air source/water-cooled heat pump device is characterized in that the device includes a refrigerant circulation loop and a solution circulation loop; the refrigerant circulation loop includes a compressor (1), a first electromagnetic valve (2), a second Solenoid valve (3), regenerator (4), four-way valve (5), first heat exchanger (6), first one-way valve (7), second one-way valve (8), third one-way valve Valve (12), fourth one-way valve (13), liquid reservoir (9), filter (10), electronic expansion valve (11), second heat exchanger (14), gas-liquid separator (15) and related connecting pipelines; the output end of the compressor (1) is divided into two paths, one path is connected to the input end a of the regenerator (4) through the first solenoid valve (2), and the other path is connected to the regeneration port through the second solenoid valve (3) The output end b of the device (4) is combined and then connected to the input end a of the four-way valve (5), the output end b of the four-way valve (5) is connected to the input end a of the first heat exchanger (6), and the first heat exchanger The output end b of the device (6) is connected to the input end of the liquid reservoir (9) through the first one-way valve (7), and the output end b of the first heat exchanger (6) is also connected through the first one-way valve (7) ), the second one-way valve (8) is connected to the input end a of the second heat exchanger (14), the output end of the liquid reservoir (9) is connected to the input end of the electronic expansion valve (11) through the filter (10), The output end of the electronic expansion valve (11) is connected to the input end a of the second heat exchanger (14) through the fourth one-way valve (13), while the output end of the electronic expansion valve (11) also passes through the third one-way valve (12 ) is connected to the output end b of the first heat exchanger (6), the output end b of the second heat exchanger (14) is connected to the input end c of the four-way valve (5), and the output end d of the four-way valve (5) is connected to The input end of the gas-liquid separator (15), and the output end of the gas-liquid separator (15) is connected to the input end of the compressor (1); The solution circulation loop includes a cooling tower (16), a solution reservoir (20), a first hand valve (17), a second hand valve (18), a third hand valve (19), a variable frequency pump (21), an electric three through the regulating valve (22), the regenerator (4), the second heat exchanger (14) and related connecting pipes; the outlet of the cooling tower (16) is divided into two paths, and one path is connected to the solution storage liquid through the first hand valve (17) The inlet of the solution reservoir (20), the outlet of the solution reservoir (20) is connected to the inlet of the frequency conversion pump (21) through the third hand valve (19), and the other way is also connected to the frequency conversion pump (21) through the second hand valve (18). Entrance. The outlet of the frequency conversion pump (21) is connected to the inlet of the electric three-way regulating valve (22), one outlet of the electric three-way regulating valve (22) is connected to the solution input port c of the regenerator (4), and the other one is connected to the outlet of the regenerator (4). The solution outlet d is combined and then connected to the solution inlet c of the second heat exchanger (14), and the solution outlet d of the second heat exchanger (14) is connected to the inlet of the cooling tower (16). 2. The solution-based air source/water-cooled heat pump device according to claim 1, characterized in that the temperature of the solution at the solution inlet of the cooling tower (16) is changed by adjusting the frequency of the variable frequency pump (21) to change the flow rate of the variable frequency pump (21) And achieve. 3. The solution-based air source/water-cooled heat pump device according to claim 1, characterized in that the solution concentration at the solution inlet of the cooling tower (16) is changed by adjusting the electric control three-way valve (22) to change the concentration of the solution entering the regenerator (4 ) achieved by the solution flow rate of the regeneration. 4. The solution-based air source/water-cooled heat pump device according to claim 1, characterized in that the heat source for solution regeneration in the regenerator (4) is the heat of the superheated section of the refrigerant discharged from the compressor (1).

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