CN111174268A - Air source trans-critical carbon dioxide heat pump heating system and control method - Google Patents
Air source trans-critical carbon dioxide heat pump heating system and control method Download PDFInfo
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- CN111174268A CN111174268A CN202010042999.1A CN202010042999A CN111174268A CN 111174268 A CN111174268 A CN 111174268A CN 202010042999 A CN202010042999 A CN 202010042999A CN 111174268 A CN111174268 A CN 111174268A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
Abstract
The invention relates to the technical field of refrigeration equipment, in particular to an air source trans-critical carbon dioxide heat pump heating system and a control method. The system comprises a compressor, a gas cooler, three throttle valves, four electromagnetic valves, an evaporator and a gas-liquid separator; the gas cooler comprises two hot side loops; the outlet of the compressor is divided into two paths, one path is connected to the inlet of the evaporator through a fourth electromagnetic valve, and the other path is connected with the inlet of a first hot side of the gas cooler; the first hot side outlet of the gas cooler is connected with a first throttling valve; one path of the bypass of the first throttling valve outlet is connected to the second hot side inlet of the gas cooler through a second throttling valve, and the first throttling valve outlet is connected with the evaporator inlet through a third throttling valve; and a second hot side outlet of the gas cooler is divided into two paths, one path is connected to an inlet of the gas-liquid separator, the other path is connected to an inlet of the evaporator after being converged with the third throttling valve branch, and an outlet of the evaporator is connected to an inlet of the compressor through the gas-liquid separator.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to an air source trans-critical carbon dioxide heat pump heating system and a control method.
Background
In recent years, the reserve of non-renewable energy is rapidly reduced, and the energy crisis brings about endless social problems. The air conditioner and refrigeration industry consumes huge energy, the energy conservation and emission reduction are imperative, and the development and utilization of clean energy are increasingly popularized. According to investigation, the total waste heat resources of all industries account for 17% -67% of the total fuel consumption, and the recyclable waste heat resources account for 60% of the total waste heat resources. With CO2The air source heat pump for refrigerating working media is emphasized and applied due to the characteristics of high energy efficiency ratio, energy conservation, environmental protection, economy, safety, avoidance of ozone layer damage and the like. However, in CO2When the heat pump is used for heating, the return water temperature is higher, so that CO is generated2The heat pump heating system has large throttling loss, reduced system performance and insufficient heat supply. In addition, when the heat pump system is used for heating in winter, the surface of the outdoor heat exchanger is easy to frost, the flowing heat transfer between air and a refrigerant is weakened by a frost layer, the heat transfer capacity is continuously deteriorated along with the continuous heat exchange, the evaporation temperature is continuously reduced, and the heating capacity and the energy efficiency ratio of the system are seriously influenced. Therefore, the return water temperature is reduced, and the trans-critical CO of the air source is reduced2Throttling loss of the heat pump system, evaporator frosting delay, heat pump system performance improvement and CO elimination2The popularization and the application of the heat pump system have very important significance.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an air source trans-critical carbon dioxide heat pump heating system and a control method, which can reduce the throttling loss of the system, delay the frosting of an evaporator, and improve the waste heat utilization rate and the defrosting efficiency, therebyCO lift2Performance of the heat pump system.
The invention is realized by the following technical scheme:
an air source trans-critical carbon dioxide heat pump heating system comprises a compressor, a gas cooler, three throttle valves, four electromagnetic valves, an evaporator and a gas-liquid separator;
the gas cooler comprises two hot side loops;
the outlet of the compressor is divided into two paths, one path is connected to the inlet of the evaporator through a fourth electromagnetic valve, and the other path is connected with the inlet of a first hot side of the gas cooler; the first hot side outlet of the gas cooler is connected with the first throttling valve inlet; one path of the bypass of the first throttling valve outlet is connected with a second hot side inlet of the gas cooler through a second throttling valve, and the first throttling valve outlet is connected with an evaporator inlet through a third throttling valve;
the second hot side outlet of the gas cooler is divided into two paths, one path is connected to the inlet of the gas-liquid separator through the third electromagnetic valve, the other path is connected to the inlet of the evaporator after being converged by the first electromagnetic valve and the third throttle valve, the outlet of the evaporator is connected to the inlet of the gas-liquid separator through the second electromagnetic valve, and the outlet of the gas-liquid separator is connected to the inlet of the compressor.
Preferably, the two hot side loops are respectively a first hot side loop between a first hot side inlet and a first hot side outlet and used for heat release and energy supply; and a second hot side loop between the second hot side inlet and the second hot side outlet for recovering waste heat and supplying energy.
A control method of an air source trans-critical carbon dioxide heat pump heating system is based on any one of the above systems, and comprises the following steps:
in the heating mode, the refrigerant is throttled and depressurized by a first throttle valve and then divided into two paths, one path of the refrigerant bypasses the second hot side of the gas cooler to recover waste heat, and then enters a gas-liquid separator through a third electromagnetic valve; one path of the refrigerant enters an evaporator after being throttled and depressurized by a third throttle valve and finally returns to a compressor through a gas-liquid separator;
in a frosting mode, the refrigerant is throttled and depressurized by a first throttle valve and then bypasses the refrigerant to enter a second hot side of the gas cooler to recover waste heat, the refrigerant at the outlet of the second hot side of the gas cooler is converged with the refrigerant throttled by a third throttle valve through a first electromagnetic valve and then enters an evaporator, and then the refrigerant returns to the compressor through a gas-liquid separator;
in the defrosting mode, refrigerant gas at the outlet of the compressor enters the evaporator for defrosting through the fourth electromagnetic valve, and meanwhile, the refrigerant flowing out of the outlet of the second hot side of the gas cooler is converged with the refrigerant subjected to throttling and pressure reduction through the first electromagnetic valve and the third throttle valve, enters the evaporator, and finally returns to the compressor through the gas-liquid separator to complete circulation.
Preferably, the heating mode comprises the following specific steps:
closing the first electromagnetic valve and the fourth electromagnetic valve, compressing the refrigerant into high-temperature and high-pressure steam by the compressor, then feeding the steam into the gas cooler, and cooling the refrigerant after releasing heat to the cooling medium, and then feeding the refrigerant into the first throttle valve from the first hot side outlet of the gas cooler; the throttled and depressurized refrigerant is divided into two paths, wherein one path of the refrigerant is throttled for the second time by a second throttle valve and then bypasses the refrigerant to enter a second hot side loop of the gas cooler to absorb the heat of the returned water; the refrigerant flowing out of the second hot side outlet of the gas cooler enters a gas-liquid separator through a third electromagnetic valve for gas-liquid separation; the other path is throttled and depressurized by a third throttle valve, enters an evaporator for evaporation and heat absorption, enters a gas-liquid separator through a second electromagnetic valve for gas-liquid separation, and finally returns to a compressor to complete circulation.
Preferably, the frosting mode comprises the following specific steps:
closing the third electromagnetic valve and the fourth electromagnetic valve, compressing the refrigerant into high-temperature and high-pressure steam by the compressor, then feeding the steam into the gas cooler, and cooling the refrigerant after releasing heat to the cooling medium, and then feeding the refrigerant into the first throttle valve from the first hot side outlet of the gas cooler; one path of the throttled and depressurized refrigerant bypass is throttled for the second time by a second throttle valve and then enters a second hot side loop of the gas cooler to absorb the heat of the returned water; the refrigerant flowing out of the second hot side outlet of the gas cooler is converged with the refrigerant subjected to throttling and pressure reduction by the third throttle valve through the first electromagnetic valve, enters the evaporator, is subjected to gas-liquid separation through the gas-liquid separator and finally returns to the compressor.
Preferably, the specific steps of the defrost mode are as follows:
and closing the third electromagnetic valve, opening the fourth electromagnetic valve, enabling high-temperature and high-pressure refrigerant gas at the outlet of the compressor to enter the evaporator for defrosting through the fourth electromagnetic valve, enabling the refrigerant flowing out of the outlet of the second hot side of the gas cooler to be converged with the refrigerant subjected to throttling and pressure reduction through the first electromagnetic valve and the third throttle valve, enabling the refrigerant to enter the evaporator, enabling the defrosted low-temperature and low-pressure gas to enter the gas-liquid separator through the second electromagnetic valve for gas-liquid separation, and finally returning to the compressor to complete circulation.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention designs a bypass branch, which bypasses the branch at the outlet of the throttle valve to the gas cooler. When the system is in a heating mode, the refrigerant absorbs the return water waste heat through the throttle valve bypass, and the throttle valve adjusts the flow and the pressure drop of the bypass branch refrigerant, so that on one hand, the temperature of the refrigerant before entering the valve is reduced, and the throttling loss of the system is reduced; on one hand, the refrigerant after absorbing the waste heat and the refrigerant after evaporating and absorbing the heat are converged and enter the compressor, so that the suction temperature of the compressor is improved, and the system performance is improved; on the other hand, the bypass gas cooler improves the utilization rate of waste heat. When the system is in a frosting mode, the refrigerant after absorbing the waste heat of the return water and the throttled refrigerant are converged and enter the evaporator, so that the evaporation temperature is increased, and the frosting of the system is delayed. During the defrosting mode of the system, on the basis of the traditional hot gas bypass defrosting, the refrigerant flowing out of the outlet at the second hot side of the gas cooler and the refrigerant after throttling and pressure reduction by the third throttle valve are converged and enter the evaporator, so that the evaporation temperature is increased, and the defrosting efficiency is improved.
Drawings
FIG. 1: the structural schematic diagram of the system of the invention.
FIG. 2: the invention discloses a schematic diagram of a heating mode of a system.
FIG. 3: the invention discloses a schematic diagram of a frosting mode of a system.
FIG. 4: the invention discloses a schematic diagram of a defrosting mode of a system.
In the figure, a is a first hot side outlet, b is a second hot side outlet, 1 is a compressor, 2 is a gas cooler, 3, 4 and 5 are first, second and third throttle valves, 6, 8, 10 and 11 are first, second, third and fourth electromagnetic valves, 7 is an evaporator and 9 is a gas-liquid separator.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
Referring to fig. 1, the air source trans-critical carbon dioxide heat pump heating system provided by the invention comprises a compressor 1, a gas cooler 2, a first, a second and a third throttle valves 3, 4 and 5, a first, a second, a third and a fourth electromagnetic valves 6, 8, 10 and 11, an evaporator 7 and a gas-liquid separator 9, and the waste heat of return water is absorbed through a bypass. Wherein, the outlet of the compressor 1 is divided into two paths, one path is connected with the inlet of the evaporator 7 through a fourth electromagnetic valve 11, and the other path is connected with the inlet of the first hot side of the gas cooler 2; the first hot side outlet a of the gas cooler 2 is connected with a first throttling valve 3; one path of the bypass of the outlet of the first throttle valve 3 is connected with the inlet of the second hot side of the gas cooler 2 through a second throttle valve 4, and the outlet of the first throttle valve 3 is connected with the inlet of an evaporator 7 through a third throttle valve 5; the second hot side outlet b of the gas cooler 2 is divided into two paths, one path is connected to the inlet of the gas-liquid separator 9 through a third electromagnetic valve 10, the other path is connected to the inlet of the evaporator 7 after being converged by the first electromagnetic valve 6 and the third throttle valve 5, the outlet of the evaporator 7 is connected with a second electromagnetic valve 8, and then is connected to the inlet of the compressor 1 through the gas-liquid separator 9. And bypassing the branch behind the first throttle valve 3 in the gas cooler 2 to absorb the residual heat of the backwater. The hot side of the gas cooler 2 comprises two independent heat-releasing circulation loops, namely a first hot side loop between a first hot side inlet and a first hot side outlet a, and a main hot side loop; and a second hot side loop between the second hot side inlet and the second hot side outlet b, which is an auxiliary hot side loop.
In the heating mode, the refrigerant is throttled and depressurized by the first throttle valve 3 and then divided into two paths, one path of the refrigerant bypasses the second hot side of the gas cooler 2 to recover waste heat, and then enters the gas-liquid separator 9 through the third electromagnetic valve 10; one path of the refrigerant is throttled and decompressed by a third throttle valve 5, enters an evaporator 7 and finally returns to the compressor 1 through a gas-liquid separator 9.
In the frosting mode, the refrigerant is throttled and depressurized by the first throttle valve 3 and then bypasses the second hot side of the gas cooler 2 to recover waste heat, the refrigerant at the outlet b of the second hot side of the gas cooler 2 is throttled by the first electromagnetic valve 6 and the third throttle valve 5, then is converged into the evaporator 7, and then returns to the compressor 1 through the gas-liquid separator 9.
In the defrosting mode, refrigerant gas at the outlet of the compressor 1 enters the evaporator 7 through the fourth electromagnetic valve 11 for defrosting, and meanwhile, refrigerant flowing out of the outlet b at the second hot side of the gas cooler 2 is throttled and decompressed by the first electromagnetic valve 6 and the third throttle valve 5, is merged, enters the evaporator 7, and finally returns to the compressor 1 through the gas-liquid separator 9.
The following describes a control method of an air source trans-critical carbon dioxide heat pump heating system in detail, which includes specific procedures of a heating mode, a frosting mode and a defrosting mode.
Referring to fig. 2, in heating mode: closing the first electromagnetic valve 6 and the fourth electromagnetic valve 11, compressing the refrigerant into high-temperature and high-pressure steam by the compressor 1, then entering the gas cooler 2, releasing heat to the cooling medium, reducing the temperature, and entering the first throttling valve 3 from the first hot side outlet a of the gas cooler 2; the refrigerant throttled and depressurized by the first throttle valve 3 is divided into two paths.
One path of the water is throttled for the second time by the second throttle valve 4 and then bypasses the water to enter a second hot side loop of the gas cooler 2 to absorb the heat of the return water, so that the return water temperature of the system is reduced; the refrigerant flowing out of the second hot side outlet b of the gas cooler 2 enters the gas-liquid separator 9 through the third electromagnetic valve 10 for gas-liquid separation, and joins with the refrigerant gas flowing out of the evaporator 7 and enters the compressor, so that the suction temperature of the compressor is increased, and the system performance is improved.
The other path enters an evaporator 7 for evaporation and heat absorption after being throttled and depressurized by a third throttle valve 5, enters a gas-liquid separator 9 for gas-liquid separation through a second electromagnetic valve 8, and finally returns to the compressor 1 to complete circulation. This reduces the temperature of the refrigerant before it enters the third throttle 5, on the one hand, and the systemThrottling losses; on the other hand, the utilization rate of waste heat is improved, and CO is improved2The transcritical air source heat pump heating system has the problems of large throttling loss and overhigh exhaust temperature due to overhigh temperature of supplied and returned water in application, and further the reduction of the heating capacity of the system.
Referring to fig. 3, in the frosting mode: closing the third electromagnetic valve 10 and the fourth electromagnetic valve 11, compressing the refrigerant into high-temperature and high-pressure steam by the compressor 1, then entering the gas cooler 2, releasing heat to the cooling medium, reducing the temperature, and entering the first throttling valve 3 from the first hot side outlet a of the gas cooler 2; one path of the throttled and depressurized refrigerant bypass is throttled for the second time by the second throttle valve 4 and then enters a second hot side loop of the gas cooler 2 to absorb the heat of the return water; the refrigerant flowing out of the outlet b at the second hot side of the gas cooler 2 is throttled and depressurized by the first electromagnetic valve 6 and the third throttle valve 5, and then the throttled refrigerant is converged into the evaporator 7, and the refrigerant absorbing waste heat is converged with the throttled refrigerant at the moment, so that the evaporation temperature is increased, and the frosting of the evaporator is delayed; the refrigerant gas flowing out of the evaporator is subjected to gas-liquid separation by the gas-liquid separator 9, and finally returned to the compressor 1.
Referring to fig. 4, in defrost mode: refrigerant gas at the outlet of the compressor 1 enters the evaporator 7 through the fourth electromagnetic valve 11 for defrosting, meanwhile, refrigerant flowing out of the second hot side outlet b of the gas cooler 2 is throttled and depressurized through the first electromagnetic valve 6 and the third throttle valve 5 to be converged into the evaporator 7, and on the basis of hot gas bypass defrosting, the refrigerant after absorbing waste heat and the throttled refrigerant are converged into the evaporator, so that the evaporation temperature is increased, and the defrosting efficiency is improved. The refrigerant gas after evaporation and heat absorption is subjected to gas-liquid separation by the gas-liquid separator 9 and then returns to the compressor 1 to complete the cycle.
Claims (6)
1. An air source trans-critical carbon dioxide heat pump heating system is characterized by comprising a compressor (1), a gas cooler (2), three throttle valves, four electromagnetic valves, an evaporator (7) and a gas-liquid separator (9);
the gas cooler (2) comprises two hot side loops;
the outlet of the compressor (1) is divided into two paths, one path is connected to the inlet of the evaporator (7) through a fourth electromagnetic valve (11), and the other path is connected to the inlet of a first hot side of the gas cooler (2); a first hot side outlet (a) of the gas cooler (2) is connected with an inlet of the first throttling valve (3); one path of a bypass at the outlet of the first throttling valve (3) is connected with the second hot side inlet of the gas cooler (2) through a second throttling valve (4), and the outlet of the first throttling valve (3) is connected with the inlet of the evaporator (7) through a third throttling valve (5);
the second hot side outlet (b) of the gas cooler (2) is divided into two paths, one path is connected to the inlet of the gas-liquid separator (9) through the third electromagnetic valve (10), the other path is connected to the inlet of the evaporator (7) after being converged through the first electromagnetic valve (6) and the third throttle valve (5), the outlet of the evaporator (7) is connected to the inlet of the gas-liquid separator (9) through the second electromagnetic valve (8), and the outlet of the gas-liquid separator (9) is connected to the inlet of the compressor (1).
2. The air source trans-critical carbon dioxide heat pump heating system according to claim 1, wherein the two hot-side loops are respectively a first hot-side loop between a first hot-side inlet and a first hot-side outlet (a) for heat release and energy supply; and a second hot side loop between the second hot side inlet and the second hot side outlet (b) for recovering waste heat and supplying energy.
3. A method for controlling an air source trans-critical carbon dioxide heat pump heating system, based on the system of any one of claims 1 to 2, comprising:
in the heating mode, the refrigerant is throttled and depressurized by the first throttle valve (3) and then divided into two paths, one path of the refrigerant bypasses the second hot side of the gas cooler (2) to recover waste heat, and the refrigerant enters the gas-liquid separator (9) through the third electromagnetic valve (10); one path of the refrigerant enters an evaporator (7) after being throttled and depressurized by a third throttle valve (5), and finally returns to the compressor (1) through a gas-liquid separator (9);
in a frosting mode, the refrigerant is throttled and depressurized by the first throttle valve (3) and then bypasses the second hot side of the gas cooler (2) to recover waste heat, the refrigerant at the second hot side outlet (b) of the gas cooler (2) is converged with the refrigerant throttled by the third throttle valve (5) by the first electromagnetic valve (6) to enter the evaporator (7), and then returns to the compressor (1) by the gas-liquid separator (9);
in the defrosting mode, refrigerant gas at the outlet of the compressor (1) enters the evaporator (7) through the fourth electromagnetic valve (11) for defrosting, meanwhile, refrigerant flowing out of the second hot side outlet (b) of the gas cooler (2) is converged with the refrigerant subjected to throttling and pressure reduction by the third throttle valve (5) through the first electromagnetic valve (6), enters the evaporator (7), and finally returns to the compressor (1) through the gas-liquid separator (9) to complete circulation.
4. The control method of the air source trans-critical carbon dioxide heat pump heating system according to claim 3, characterized in that the heating mode comprises the following steps:
the first electromagnetic valve (6) and the fourth electromagnetic valve (11) are closed, the refrigerant is compressed into high-temperature and high-pressure steam by the compressor (1) and then enters the gas cooler (2), the refrigerant releases heat to the cooling medium, the temperature of the refrigerant is reduced, and the refrigerant enters the first throttling valve (3) from the first hot side outlet (a) of the gas cooler (2); the throttled and depressurized refrigerant is divided into two paths, wherein one path of the refrigerant is throttled for the second time by the second throttle valve (4) and then bypasses the refrigerant to enter a second hot side loop of the gas cooler (2) to absorb the heat of the returned water; the refrigerant flowing out of the second hot side outlet (b) of the gas cooler (2) enters a gas-liquid separator (9) through a third electromagnetic valve (10) for gas-liquid separation; the other path enters an evaporator (7) for evaporation and heat absorption after being throttled and depressurized by a third throttle valve (5), enters a gas-liquid separator (9) for gas-liquid separation through a second electromagnetic valve (8), and finally returns to the compressor (1) to complete circulation.
5. The control method of the air source trans-critical carbon dioxide heat pump heating system according to claim 3, characterized in that the frosting mode comprises the following steps:
the third electromagnetic valve (10) and the fourth electromagnetic valve (11) are closed, the refrigerant is compressed into high-temperature and high-pressure steam by the compressor (1) and then enters the gas cooler (2), the refrigerant releases heat to the cooling medium, the temperature of the refrigerant is reduced, and the refrigerant enters the first throttling valve (3) from the first hot side outlet (a) of the gas cooler (2); one path of the throttled and depressurized refrigerant bypass is throttled for the second time by a second throttle valve (4) and then enters a second hot side loop of the gas cooler (2) to absorb the heat of the backwater; the refrigerant flowing out of the second hot side outlet (b) of the gas cooler (2) is throttled and depressurized by the first electromagnetic valve (6) and the third throttle valve (5), then the refrigerant is converged into the evaporator (7), is subjected to gas-liquid separation by the gas-liquid separator (9), and finally returns to the compressor (1).
6. The control method of the air source trans-critical carbon dioxide heat pump heating system according to claim 3, characterized in that the defrosting mode comprises the following steps:
and closing the third electromagnetic valve (10), opening the fourth electromagnetic valve (11), enabling high-temperature and high-pressure refrigerant gas at the outlet of the compressor (1) to enter the evaporator (7) for defrosting through the fourth electromagnetic valve (11), enabling the refrigerant flowing out of the second hot side outlet (b) of the gas cooler (2) to converge with the refrigerant subjected to throttling and pressure reduction through the first electromagnetic valve (6) and the third throttle valve (5), enabling the refrigerant to enter the evaporator (7), enabling the defrosted low-temperature and low-pressure gas to enter the gas-liquid separator (9) through the second electromagnetic valve (8) for gas-liquid separation, and finally returning to the compressor (1) to complete circulation.
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