CN109990499B - Gas heat pump air conditioning system without shutdown during defrosting - Google Patents
Gas heat pump air conditioning system without shutdown during defrosting Download PDFInfo
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- CN109990499B CN109990499B CN201910161098.1A CN201910161098A CN109990499B CN 109990499 B CN109990499 B CN 109990499B CN 201910161098 A CN201910161098 A CN 201910161098A CN 109990499 B CN109990499 B CN 109990499B
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- heat exchanger
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a gas heat pump air-conditioning system without stopping defrosting, which comprises a refrigerant circulating loop formed by sequentially connecting a compressor, an oil separator, a four-way valve, an indoor unit heat exchanger, an outdoor unit heat exchanger and a gas-liquid separator. The compressor is connected with the gas engine through a belt; a cooling water tank is arranged outside the gas engine; the cooling water tank and the radiator form a cooling water circulation loop through a water pump; the outdoor heat exchanger comprises an indoor heat exchanger, a four-way valve, a gas-liquid separator, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, an outdoor heat exchanger and a heat exchanger, wherein one refrigerant port of the auxiliary evaporator is simultaneously connected with the four-way valve and the gas-liquid separator, and the other refrigerant port of the auxiliary evaporator is connected to a pipeline between the second end of the; the two ends of the water path of the auxiliary evaporator are respectively connected with the two ends of the radiator; and the first end of the outdoor unit heat exchanger is connected with an outlet of the oil separator. The invention can utilize part of the refrigerant to defrost, thereby avoiding the adverse effect on users caused by stopping defrosting in the past.
Description
Technical Field
The invention relates to an air conditioning system, in particular to an air conditioning system capable of defrosting on the premise of no shutdown, and particularly relates to a gas heat pump air conditioning system without shutdown for defrosting.
Background
When the air conditioning system is used for heating in winter, the outdoor environment temperature is low, and the surface of an outdoor heat exchanger (evaporator) is usually lower than 0 ℃ or lower, so that the surface can be gradually frosted, the heating capacity of a unit can be gradually reduced along with the thickening of frosting, the indoor air outlet temperature is also gradually reduced, and defrosting is needed at the moment. At present, the traditional defrosting method adopts a four-way reversing valve to switch and carries out defrosting through reverse circulation, namely, the defrosting operation is equivalent to refrigerating operation, at the moment, an indoor unit carries out cold-proof wind treatment and stops heat supply, and meanwhile, an indoor unit heat exchanger is used as an evaporator to dissipate cold indoors, but the method can cause the temperature of a room to be reduced, and the comfort is influenced.
Disclosure of Invention
The invention aims to provide a gas heat pump air-conditioning system without shutdown for defrosting, which can avoid the influence on the indoor temperature during defrosting, can also utilize gas as a power source, avoids the adverse influence caused by insufficient urban power supply, and ensures the comfort and convenience of use for users.
The technical scheme of the invention is as follows:
a gas heat pump air conditioning system without stopping defrosting comprises a refrigerant circulation loop formed by sequentially connecting a compressor, an oil separator, a four-way valve, an indoor unit heat exchanger, an outdoor unit heat exchanger and a gas-liquid separator.
The compressor is connected with the gas engine through a belt; a cooling water tank is arranged outside the gas engine; the cooling water tank and the radiator form a cooling water circulation loop through a water pump;
the outdoor heat exchanger comprises an indoor heat exchanger, a four-way valve, a gas-liquid separator, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, an outdoor heat exchanger and a heat exchanger, wherein one refrigerant port of the auxiliary evaporator is simultaneously connected with the four-way valve and the gas-liquid separator, and the other refrigerant port of the auxiliary evaporator is connected to a pipeline between the second end of the; the two ends of the water path of the auxiliary evaporator are respectively connected with the two ends of the radiator; and the first end of the outdoor unit heat exchanger is connected with an outlet of the oil separator.
Furthermore, the system also comprises a thermostat, wherein an inlet A of the thermostat is connected with one end of the cooling water tank, an outlet B of the thermostat is connected with one end of the radiator, and an outlet C of the thermostat is connected with one waterway port of the auxiliary evaporator.
Further, the system also comprises a first electronic expansion valve and a second electronic expansion valve; the first electronic expansion valve is arranged on a pipeline between the second end of the indoor unit heat exchanger and the first end of the outdoor unit heat exchanger; and the second electronic expansion valve is arranged on a pipeline between the auxiliary evaporator and the second end of the indoor unit heat exchanger.
The outdoor unit heat exchanger comprises an indoor unit heat exchanger, an outdoor unit heat exchanger, a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve, wherein the first electromagnetic valve is arranged on a pipeline between the second end of the indoor unit heat exchanger and the second end of the outdoor unit heat exchanger; the second electromagnetic valve is arranged on a pipeline between the second end of the outdoor unit heat exchanger and the four-way valve; the third electromagnetic valve is arranged on a pipeline between the first end of the outdoor unit heat exchanger and the outlet of the oil separator.
Furthermore, the radiator and the outdoor heat exchanger are arranged side by side and are closely close to each other.
The invention has the beneficial effects that:
the invention has reasonable design, compact structure and convenient use, can utilize part of refrigerant to defrost, avoids the adverse effect on users caused by stopping defrosting in the past, and improves the use comfort. Meanwhile, the heat generated by the gas engine can be fully utilized to exchange heat with the outdoor heat exchanger, so that the operating efficiency of the air conditioning system is improved, and the heating requirement is fully met.
Drawings
FIG. 1 is a system diagram of the present invention.
Wherein: 1-compressor, 2-oil separator, 3-four-way valve, 4-indoor heat exchanger, 5-indoor electronic expansion valve, 6-first electronic expansion valve, 7-outdoor heat exchanger, 8-gas-liquid separator, 9-gas engine, 10-cooling water tank, 11-radiator, 12-water pump, 13-thermostat, 14-auxiliary evaporator, 15-second electronic expansion valve, 16-first solenoid valve, 17-third solenoid valve, 18-second solenoid valve, 19-belt.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1.
A gas heat pump air-conditioning system without shutdown for defrosting comprises a refrigerant circulation loop formed by sequentially connecting a compressor 1, an oil separator 2, a four-way valve 3, an indoor machine heat exchanger 4, an outdoor machine heat exchanger 7 and a gas-liquid separator 8, and specifically comprises: an exhaust port of the compressor 1 is connected to a first end of an indoor heat exchanger 4 after sequentially passing through an oil separator 2 and a four-way valve 3, then is connected to a first end of an outdoor heat exchanger 7 from a second end of the indoor heat exchanger 4, is connected to an inlet of a gas-liquid separator 8 from a second end of the outdoor heat exchanger 7 after passing through the four-way valve 3, and finally is connected to a suction port of the compressor 1 from an outlet of the gas-liquid separator 8 to form a complete refrigerant circulation loop. The indoor heat exchangers 4 can be connected in parallel, and each indoor heat exchanger 4 is provided with an indoor electronic expansion valve 5, so that flexible control is facilitated. And the first end of the outdoor unit heat exchanger 7 is connected with the outlet of the oil separator 2.
The compressor 1 is of a belt driving type and is connected with the gas engine 9 through a belt 19; a cooling water tank 10 is provided outside the gas engine 9 to effectively cool the gas engine 9 in time. The cooling water tank 10 also forms a cooling water circulation loop through the water pump 12 and the radiator 11, so that the heated cooling water enters the radiator 11 through the water pump 12 to be cooled, and then flows back to the cooling water tank 10 to be reused, and the cooling water tank is energy-saving and environment-friendly.
The invention also comprises an auxiliary evaporator 14, one refrigerant port of the auxiliary evaporator 14 is simultaneously connected with the four-way valve 3 and the inlet of the gas-liquid separator 8, and the other refrigerant port is connected to a pipeline between the second end of the indoor heat exchanger 4 and the first end of the outdoor heat exchanger 7; the two ends of the water channel of the auxiliary evaporator 14 are respectively connected with the two ends of the radiator 11, so that cooling water can be fully utilized for heat exchange, and the service efficiency is improved.
The invention also comprises a thermostat 13, wherein an inlet A of the thermostat is connected with one end of the cooling water tank 10, an outlet B of the thermostat is connected with one end of the radiator 11, an outlet C of the thermostat is connected with one waterway port of the auxiliary evaporator 14, and the flow rates of the outlet B and the outlet C can be automatically adjusted according to the temperature of cooling water, namely, when the temperature of the cooling water is less than or equal to 70 ℃, the opening degree of the outlet B is minimum, and the opening degree of the outlet C is maximum; when the temperature of the cooling water is higher than 70 ℃, the opening degree of the outlet B is gradually increased, and the opening degree of the outlet C is gradually decreased; when the temperature of the cooling water is more than 85 ℃, the outlet B is opened to the maximum, and the opening degree of the outlet C is minimum. By adjusting the thermostat 13, the cooling water can be used sufficiently and effectively, and the normal operation of the system can be ensured.
The present invention further includes a first electronic expansion valve 6 and a second electronic expansion valve 15 to control the state of the refrigerant in each line; the first electronic expansion valve 6 is arranged on a pipeline between the second end of the indoor unit heat exchanger 4 and the first end of the outdoor unit heat exchanger 7; the second electronic expansion valve 15 is arranged on a pipeline between the auxiliary evaporator 14 and the second end of the indoor heat exchanger 4.
The invention also comprises a first electromagnetic valve 16, a second electromagnetic valve 18 and a third electromagnetic valve 17, wherein the first electromagnetic valve 16 is arranged on a pipeline between the second end of the indoor unit heat exchanger 4 and the second end of the outdoor unit heat exchanger 7; the second electromagnetic valve 18 is arranged on a pipeline between the second end of the outdoor heat exchanger 4 and the four-way valve 3; the third electromagnetic valve 17 is disposed on a pipeline between the first end of the outdoor heat exchanger 7 and the outlet of the oil separator 2. Therefore, the on-off of each section of pipeline can be conveniently controlled.
Further, the radiator 11 is arranged side by side with the outdoor heat exchanger 7 and is close to the outdoor heat exchanger, usually 0-5mm, so that sufficient heat exchange can be performed between the radiator and the outdoor heat exchanger, and the utilization rate of cooling water is improved.
The gas engine can be 3GPH 88. The compressor can be GHP5212MY 2.
The operation process of the invention is as follows:
when the system is in heating operation, the second solenoid valve and the first electronic expansion valve are in an open state, and meanwhile, the first solenoid valve, the third solenoid valve and the second electronic expansion valve are in a closed state. At the moment, the refrigerant is compressed into high-temperature and high-pressure gaseous refrigerant by the compressor, the high-temperature and high-pressure gaseous refrigerant sequentially passes through the oil separator and the four-way valve and then enters the indoor unit heat exchanger to be condensed into high-temperature and high-pressure liquid refrigerant, the high-temperature and high-pressure liquid refrigerant passes through the indoor unit electronic expansion valve and then is throttled into low-temperature and low-pressure gas-liquid two-phase refrigerant by the first electronic expansion valve, the low-temperature and low-pressure gas-liquid two-phase refrigerant is subjected to heat exchange with the radiator and air in the outdoor unit heat exchanger simultaneously and is evaporated into low-temperature and low-pressure gaseous.
When the system is in defrosting operation, the second electromagnetic valve and the first electronic expansion valve are in a closed state, and meanwhile, the first electromagnetic valve, the third electromagnetic valve and the second electronic expansion valve are in an open state. At the moment, the refrigerant is compressed into high-temperature and high-pressure gaseous refrigerant by the compressor, and after passing through the oil separator, a part of refrigerant enters the indoor unit heat exchanger through the four-way valve and is condensed into high-temperature and high-pressure liquid refrigerant I; and the other part of the refrigerant enters the outdoor unit heat exchanger after passing through the third electromagnetic valve, is condensed into a high-temperature and high-pressure liquid refrigerant II, is mixed with the liquid refrigerant I after passing through the first electromagnetic valve, is throttled into a low-temperature and low-pressure gas-liquid two-phase refrigerant through the second electronic expansion valve, exchanges heat with high-temperature cooling water from a cooling water tank in the auxiliary evaporator, is evaporated into a low-temperature and low-pressure gas refrigerant, then flows into the gas-liquid separator to be separated into a gas refrigerant and a liquid refrigerant, and finally returns to the compressor to start circulation again.
When the defrosting system is in defrosting operation, the refrigerant can enter the indoor unit for heating and can enter the outdoor unit for defrosting without switching the four-way valve to convert a refrigeration mode for defrosting, so that the adverse effect caused by the conventional necessity of stopping the defrosting is avoided, the feeling of a user is greatly improved, and the operation efficiency of the system is improved.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (4)
1. A gas heat pump air conditioning system without stopping defrosting comprises a refrigerant circulation loop formed by sequentially connecting a compressor, an oil separator, a four-way valve, an indoor unit heat exchanger, an outdoor unit heat exchanger and a gas-liquid separator,
the gas engine is characterized in that the compressor is connected with the gas engine through a belt; a cooling water tank is arranged outside the gas engine; the cooling water tank and the radiator form a cooling water circulation loop through a water pump;
the outdoor heat exchanger comprises an indoor heat exchanger, a four-way valve, a gas-liquid separator, a four-way valve, an outdoor heat exchanger, an indoor heat exchanger, an outdoor heat exchanger and a heat exchanger, wherein one refrigerant port of the auxiliary evaporator is simultaneously connected with the four-way valve and the gas-liquid separator, and the other refrigerant port of the auxiliary evaporator is connected to a pipeline between the second end of the; the two ends of the water path of the auxiliary evaporator are respectively connected with the two ends of the radiator; the first end of the outdoor unit heat exchanger is connected with an outlet of the oil separator;
the system also comprises a first electronic expansion valve and a second electronic expansion valve; the first electronic expansion valve is arranged on a pipeline between the second end of the indoor unit heat exchanger and the first end of the outdoor unit heat exchanger; and the second electronic expansion valve is arranged on a pipeline between the auxiliary evaporator and the second end of the indoor unit heat exchanger.
2. A defrosting non-stop gas heat pump air conditioning system as claimed in claim 1 further comprising a thermostat having an inlet a connected to one end of the cooling water tank, an outlet B connected to one end of the radiator, and an outlet C connected to a water path port of the sub-evaporator.
3. The gas heat pump air conditioning system without shutdown for defrosting of claim 1, further comprising a first solenoid valve, a second solenoid valve and a third solenoid valve, wherein the first solenoid valve is arranged on a pipeline between the second end of the heat exchanger of the indoor unit and the second end of the heat exchanger of the outdoor unit; the second electromagnetic valve is arranged on a pipeline between the second end of the outdoor unit heat exchanger and the four-way valve; the third electromagnetic valve is arranged on a pipeline between the first end of the outdoor unit heat exchanger and the outlet of the oil separator.
4. The non-stop defrost gas heat pump air conditioning system as recited in claim 1 wherein said heat sink is positioned side-by-side and in close proximity to said outdoor heat exchanger.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910161098.1A CN109990499B (en) | 2019-03-04 | 2019-03-04 | Gas heat pump air conditioning system without shutdown during defrosting |
| PCT/CN2019/100244 WO2020177275A1 (en) | 2019-03-04 | 2019-08-12 | Gas heat pump air-conditioning system having non-stop defrosting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910161098.1A CN109990499B (en) | 2019-03-04 | 2019-03-04 | Gas heat pump air conditioning system without shutdown during defrosting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109990499A CN109990499A (en) | 2019-07-09 |
| CN109990499B true CN109990499B (en) | 2021-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910161098.1A Active CN109990499B (en) | 2019-03-04 | 2019-03-04 | Gas heat pump air conditioning system without shutdown during defrosting |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109990499B (en) |
| WO (1) | WO2020177275A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109990499B (en) * | 2019-03-04 | 2021-02-19 | 南京天加环境科技有限公司 | Gas heat pump air conditioning system without shutdown during defrosting |
| CN110793096B (en) * | 2019-11-29 | 2024-07-23 | 宁波奥克斯电气股份有限公司 | Air conditioning unit and control method and control device thereof |
| CN113432350A (en) * | 2020-03-20 | 2021-09-24 | 青岛海尔空调电子有限公司 | Pipeline oil cleaning device for air conditioning system and air conditioning system |
| CN112815569B (en) * | 2021-01-14 | 2022-04-26 | 中科广能能源研究院(重庆)有限公司 | Gas heat pump cold and hot water unit air conditioning system and control method thereof |
| CN114543387A (en) * | 2022-02-25 | 2022-05-27 | 南京天加环境科技有限公司 | Gas heat pump system capable of improving defrosting efficiency and control method thereof |
| CN114719458A (en) * | 2022-04-08 | 2022-07-08 | 哈尔滨工业大学 | Quasi-second-stage compression gas heat pump unit suitable for air supplement adjustable type in severe cold area |
| CN115307338B (en) * | 2022-08-12 | 2023-12-01 | 南京天加环境科技有限公司 | Heat recovery device of gas heat pump and control method |
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| CN109990499B (en) * | 2019-03-04 | 2021-02-19 | 南京天加环境科技有限公司 | Gas heat pump air conditioning system without shutdown during defrosting |
-
2019
- 2019-03-04 CN CN201910161098.1A patent/CN109990499B/en active Active
- 2019-08-12 WO PCT/CN2019/100244 patent/WO2020177275A1/en active Application Filing
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| JPH06265242A (en) * | 1993-03-11 | 1994-09-20 | Nippondenso Co Ltd | Engine driven heat pump |
| CN106440501A (en) * | 2016-11-18 | 2017-02-22 | 天津城建大学 | Running method of heat pump unit of energy-self-supplied gas engine |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2020177275A1 (en) | 2020-09-10 |
| CN109990499A (en) | 2019-07-09 |
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