CN104634020A - Defrosting system for air source heat pump - Google Patents
Defrosting system for air source heat pump Download PDFInfo
- Publication number
- CN104634020A CN104634020A CN201510036731.6A CN201510036731A CN104634020A CN 104634020 A CN104634020 A CN 104634020A CN 201510036731 A CN201510036731 A CN 201510036731A CN 104634020 A CN104634020 A CN 104634020A
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- Prior art keywords
- gas
- liquid separator
- heat exchanger
- compressor
- injector
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Classifications
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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
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/22—Disposition of valves, e.g. of on-off valves or flow control valves between evaporator and compressor
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
Provided is a defrosting system for an air source heat pump. An outlet of a compressor is connected with an inlet of a four-way reversing valve, an outlet of the four-way reversing valve is divided into two paths, one path is connected with an inlet of an indoor heat exchanger, the other path is connected with an inlet of a nozzle of an ejector through an adjusting valve, an outlet of the indoor heat exchanger is connected with an inlet of an outdoor heat exchanger through a throttling device, and an outlet of the outdoor heat exchanger is connected with a gas-liquid separator through the four-way reversing valve; an outlet of the gas-liquid separator is divided into two paths, one path is connected with an air suction port of the compressor, and the other path is connected with an ejected refrigerating agent inlet of the ejector through a one-way throttling valve; a refrigerating agent outlet of the ejector is connected with the inlet of the outdoor heat exchanger. Due to the fact that most of air exhausted by the compressor still enters the indoor heat exchanger, normal work of a heat pump loop is achieved, heat is supplied into a room, and reduction of indoor heat comfort is avoided. Besides, the electric heating gas-liquid separator is adopted so that defrosting heat supply amount can be increased, defrosting time can be remarkably reduced, and it is guaranteed that the requirement for indoor heat comfort is met.
Description
Technical field
The invention belongs to Refrigeration & Air-Conditioning technical field, be specifically related to a kind of defrost system for air source heat pump.
Background technology
Along with the continuous progress of society and the development of science and technology, people are more and more concerned about the earth that we depend on for existence, and most countries has also been fully recognized that the importance of environment to our human development in the world.Each state is all taking active and effective measure environmental protect, decreasing pollution.This is wherein important be also problem the most urgent is exactly energy problem, fundamentally will solve energy problem, and except finding the new energy, energy-conservation be crucial is also the most effective important measures at present.In recent years, by effort, people achieve significant achievement in the research and product development of power-saving technology.Wherein, air source heat pump is exactly a kind of product with energy-efficient potentiality, as heat pump type air conditioner and Teat pump boiler.Air source heat pump based on vapor-compression cycle utilizes surrounding air to make thermal source, to be sent in hot environment by the heat in surrounding air to go by consuming part electric energy.The heat that heat pump exports comprises the wasted work of compressor and the heat absorbed from surrounding air.Therefore, compared to the air-conditioner of traditional electric heater and electric auxiliary heating, adopt air source heat pump can save a large amount of electric energy.
But when air source heat pump runs in the winter time, outdoor heat exchanger meeting frosting, when frost layer runs up to a certain degree, heating capacity will significantly be decayed, and therefore must defrost.At present, the Defrost mode that steam compression type air source heat pump system is conventional has reverse cycle defrosting and hot gas bypass defrosting.Heat pump type air conditioner is when adopting reverse cycle defrosting mode, and in defrost process, system will be absorbed heat from room, causes indoor temperature to reduce, thus have impact on indoor thermal comfort.On the other hand, when being switched to heating mode after defrosting terminates, because the indoor heat exchanger surface temperature as evaporimeter is still very low, making air-conditioner blow out hot blast also can be delayed, also reduces indoor thermal comfort.And hot gas bypass defrosting mode, although do not need heat in suction chamber, the appearance of phenomenon of blowing a cold wind over when avoiding defrosting, but because heat during hot gas bypass defrosting needed for system defrosting is entirely from the input power of compressor, therefore defrosting time is relatively long, also indoor temperature can be caused to decline, have impact on indoor thermal comfort equally.
Summary of the invention
For solving the defect and deficiency that exist in above-mentioned prior art, the present invention proposes a kind of defrost system for air source heat pump, compared to existing reverse cycle defrosting mode, in the solution that the technology of the present invention provides, owing to only having a small amount of compressor air-discharging bypass, major part compressor air-discharging still can enter indoor heat exchanger and realize heat pump circuit and normally work, and is indoor heating, avoids the reduction of indoor thermal comfort.In addition, there is electrically heated gas-liquid separator can increase defrosting heating load owing to adopting, compared to existing hot-gas bypass defrosting system, significantly can reduce defrosting time, this guarantees the requirement of indoor thermal comfort.
For achieving the above object, the technical solution adopted in the present invention is:
For a defrost system for air source heat pump, compressor 101 exports and is connected with four-way change-over valve 102 import; Four-way change-over valve 102 exports a point two-way, and a road is connected with indoor heat exchanger 103 entrance, and another road is connected through the nozzle entrance of control valve 105 with injector 106; Indoor heat exchanger 103 exports and is connected with outdoor heat exchanger 108 import through throttling arrangement 104, and outdoor heat exchanger 108 is exported and is connected with gas-liquid separator 110 by four-way change-over valve 102; Gas-liquid separator 110 gas vent divides two-way, and a road is connected with the air entry of compressor 101, and another road is connected by injection refrigerant inlet through one-way throttle valve 107 and injector 106; Injector 106 refrigerant outlet is connected with outdoor heat exchanger 108 import;
The high-temperature high-pressure refrigerant gas that described compressor 101 exports, successively through four-way change-over valve 102, indoor heat exchanger 103, throttling arrangement 104, outdoor heat exchanger 108, four-way change-over valve 102, enters gas-liquid separator 110 and finally gets back to compressor air suction mouth composition heat pump circuit;
Described compressor 101 exports high-temperature high-pressure refrigerant gas through four-way change-over valve 102, control valve 105 enters the nozzle entrance of injector 106, injection is from the saturated refrigerant gas in gas-liquid separator 110, saturated refrigerant gas in gas-liquid separator is through one-way throttle valve 107 throttling, pressure reduce laggard enter injector 106 by injection refrigerant inlet, the mixing section of this gas at injector 106 and the gas and vapor permeation from nozzle, mix refrigerant pressure after the diffuser diffusion of injector 106 gos up to some extent, through the outlet of injector 106, enter outdoor heat exchanger 108 heat release, defrosting, gas-liquid separator 110 is got back to through four-way change-over valve 102, composition defrost circuit,
Described control valve 105 cuts out after defrosting terminates.
Having heaters 109 is with by described gas-liquid separator 110.
Described gas-liquid separator 110 for compressor 101 with gas-liquid separator or the new gas-liquid separator added.
Described gas-liquid separator 110 for compressor 101 with gas-liquid separator time, gas-liquid separator 110 with heater 109 for inserting wherein electrically heated rod.
When described gas-liquid separator 110 is the new gas-liquid separator added, gas-liquid separator 110 with heater 109 for inserting wherein electrically heated rod or being wrapped in the electrical heating wire on gas-liquid separator 110 surface.
Described gas-liquid separator 110 is heated by heater 109, provides the heat required for defrosting during defrosting, and meets the demand of indoor thermic load simultaneously; When air source heat pump normally works, improve the evaporating temperature of outdoor heat exchanger 108 when heater 109 heats, the surperficial frosting of outdoor heat exchanger 108 can be slowed down, play the effect of resistance frost; At non-defrosting operating condition and outdoor environment temperature is lower time, as indoor heating quantity not sufficient, heater 109 plays the effect of auxiliary heating, improves the heat capacity of air source heat pump.
Described one-way throttle valve 107 when defrosting, guarantee from the saturated refrigerant gas in gas-liquid separator 110 enter injector 106 by injection refrigerant inlet; At the end of defrosting, the cold-producing medium that one-way throttle valve 107 can prevent throttling arrangement 104 from exporting directly enters gas-liquid separator 110.
The present invention proposes a kind of defrost system for air source heat pump, i.e. a kind of new band injector and have the hot-air-bypass defrost system of electrically heated gas-liquid separator; Within the system, the high-temperature high-pressure refrigerant Working medium gas utilizing a small amount of compressor to discharge is as the working fluid of injector, by the saturated gas in injector injection gas-liquid separator, the refrigerant liquid that this gas is heated wherein by the electric heater of gas-liquid separator produces; The mist of injector outlet enters heat release in the outdoor heat exchanger of frosting, and then defrosts to outdoor heat exchanger; Compared to the Defrost mode of routine, tool of the present invention has the following advantages:
1, this system is while defrost circuit work, heat pump circuit normally works, and only need a small amount of compressor air-discharging as injector working fluid for injection from the saturated gas in gas-liquid separator, and most of compressor air-discharging enters indoor heat exchanger, therefore the heating load of indoor heat exchanger still can meet indoor thermal load demands, thus can not affect indoor comfort level.
2, in this system, the use of injector is got back to outdoor heat exchanger for the saturated gas in gas-liquid separator and is provided possibility, thus achieves the transmission to outdoor heat exchanger of heat that auxiliary heater provides.In the process using the high-temperature high-pressure refrigerant Working medium gas of a small amount of compressor outlet as driving force, do not need to increase new wasted work parts, saved energy.
3, in this system, auxiliary heater heats gas-liquid separator, because the caloric receptivity of outdoor heat exchanger reduces during defrosting, plays the effect of auxiliary heating, meets indoor thermic load; When heat pump normally works, the evaporating temperature of outdoor heat exchanger can be improved during heater heating, evaporator surface frosting can be slowed down, play the effect of resistance frost; When outdoor temperature reduces, heater also can play the effect of auxiliary heating.
4, air source heat pump of the present invention defrosting and resistance defrosting system be a kind of effective, feasible defrosting scheme, can effectively defrost to air source hot pump water heater and air source heat pump air-conditioner, the effect of resistance frost can be played simultaneously, and the requirement of indoor comfort degree can be met during defrosting.
5, the present invention remains the mode of reverse circulation defrost simultaneously, can carry out according to user's request.
Accompanying drawing explanation
Fig. 1 is the defrost system schematic diagram of embodiment 1 for air source heat pump.
Fig. 2 is the defrost system schematic diagram of embodiment 2 for air source heat pump.
Fig. 3 is the defrost system schematic diagram of embodiment 3 for air source heat pump.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present inventor is described in further details.
Embodiment 1:
As shown in Figure 1, for the defrost system of air source heat pump, compressor 101 exports and is connected with four-way change-over valve 102 import; Four-way change-over valve 102 exports a point two-way, and a road is connected with indoor heat exchanger 103 entrance, and another road is connected through the nozzle entrance of control valve 105 with injector 106; Indoor heat exchanger 103 exports and is connected with outdoor heat exchanger 108 import through throttling arrangement 104, outdoor heat exchanger 108 export by four-way change-over valve 102 and compressor 101 with gas-liquid separator be connected; Compressor 101 with gas-liquid separator 110 gas vent divide two-way, a road is connected with the air entry of compressor 101, and another road is connected by injection refrigerant inlet through one-way throttle valve 107 and injector 106; Injector 106 refrigerant outlet is connected with outdoor heat exchanger 108 import; Described compressor 101 with gas-liquid separator 110 in there is electrically heated rod 109.
The high-temperature high-pressure refrigerant gas that described compressor 101 exports successively through four-way change-over valve 102, indoor heat exchanger 103, throttling arrangement 104, outdoor heat exchanger 108, four-way change-over valve 102, enter compressor 101 with gas-liquid separator and finally get back to compressor air suction mouth composition heat pump circuit.
Described compressor 101 exports high-temperature high-pressure refrigerant gas through four-way change-over valve 102, control valve 105 enters the nozzle entrance of injector 106, injection from compressor 101 with gas-liquid separator in saturated refrigerant gas, this saturated refrigerant gas is through one-way throttle valve 107 throttling, pressure reduce laggard enter injector 106 by injection refrigerant inlet, the mixing section of this gas at injector 106 and the gas and vapor permeation from nozzle, mix refrigerant pressure after the diffuser diffusion of injector 106 gos up to some extent, through the outlet of injector 106, enter outdoor heat exchanger 108 heat release, defrosting, through four-way change-over valve get back to compressor 101 with gas-liquid separator, composition defrost circuit.
Embodiment 2:
As shown in Figure 2, for the defrost system of air source heat pump, compressor 101 exports and is connected with four-way change-over valve 102 import; Four-way change-over valve 102 exports a point two-way, and a road is connected with indoor heat exchanger 103 entrance, and another road is connected through the nozzle entrance of control valve 105 with injector 106; Indoor heat exchanger 103 exports and is connected with outdoor heat exchanger 108 import through throttling arrangement 104, outdoor heat exchanger 108 export by four-way change-over valve 102 and compressor 101 with gas-liquid separator be connected; Gas-liquid separator 110 gas vent of new interpolation divides two-way, and a road is connected with the air entry of compressor 101, and another road is connected by injection refrigerant inlet through one-way throttle valve 107 and injector 106; Injector 106 refrigerant outlet is connected with outdoor heat exchanger 108 import; The electrically heated rod 109 that described gas-liquid separator 110 is inserted into wherein heats.
The high-temperature high-pressure refrigerant gas that described compressor 101 exports is successively through four-way change-over valve 102, indoor heat exchanger 103, throttling arrangement 104, outdoor heat exchanger 108, four-way change-over valve 102, gas-liquid separator 110, enters the air entry composition heat pump circuit of compressor 101.
Described compressor 101 exports high-temperature high-pressure refrigerant gas enters injector 106 nozzle through four-way change-over valve 102, control valve 105, saturated refrigerant gas in injection gas-liquid separator 110 is through one-way throttle valve 107 throttling, enter injector 106 by injection refrigerant inlet, with the gas and vapor permeation from nozzle, mix refrigerant enters outdoor heat exchanger 108 heat release, defrosting, and get back to gas-liquid separator 110, composition defrost circuit.
Embodiment 3:
As shown in Figure 3, the present embodiment gas-liquid separator 110 is wrapped in the electrical heating wire heating on gas-liquid separator 110 surface, and other are with embodiment 2.
Claims (7)
1. for a defrost system for air source heat pump, it is characterized in that: compressor (101) outlet is connected with four-way change-over valve (102) import; Four-way change-over valve (102) outlet point two-way, a road is connected with indoor heat exchanger (103) entrance, and another road is connected through the nozzle entrance of control valve (105) with injector (106); Indoor heat exchanger (103) outlet is connected with outdoor heat exchanger (108) import through throttling arrangement (104), and outdoor heat exchanger (108) outlet is connected with gas-liquid separator (110) by four-way change-over valve (102); Gas-liquid separator (110) gas vent divides two-way, and a road is connected with the air entry of compressor (101), and another road is connected by injection refrigerant inlet through one-way throttle valve (107) and injector (106); Injector (106) refrigerant outlet is connected with outdoor heat exchanger (108) import;
The high-temperature high-pressure refrigerant gas that described compressor (101) exports, successively through four-way change-over valve (102), indoor heat exchanger (103), throttling arrangement (104), outdoor heat exchanger (108), four-way change-over valve (102), enters gas-liquid separator (110) and finally gets back to compressor air suction mouth composition heat pump circuit;
Described compressor (101) outlet high-temperature high-pressure refrigerant gas is through four-way change-over valve (102), control valve (105) enters the nozzle entrance of injector (106), injection is from the saturated refrigerant gas in gas-liquid separator (110), saturated refrigerant gas in gas-liquid separator is through one-way throttle valve (107) throttling, pressure reduce laggard enter injector (106) by injection refrigerant inlet, the mixing section of this gas at injector (106) and the gas and vapor permeation from nozzle, mix refrigerant pressure after the diffuser diffusion of injector (106) gos up to some extent, through the outlet of injector (106), enter outdoor heat exchanger (108) heat release, defrosting, gas-liquid separator (110) is got back to through four-way change-over valve (102), composition defrost circuit,
Described gas-liquid separator (110) band having heaters (109);
Described control valve 105 cuts out after defrosting terminates.
2. a kind of defrost system for air source heat pump according to claim 1, it is characterized in that: the use of described injector (106), get back to outdoor heat exchanger (108) for the saturated gas in gas-liquid separator (110) and provide possibility, the high-temperature high-pressure refrigerant Working medium gas exported using a small amount of compressor (101) in the process, as driving force, achieves the transmission to outdoor heat exchanger (108) of heat that auxiliary heater (109) provides.
3. a kind of defrost system for air source heat pump according to claim 1, is characterized in that: described gas-liquid separator (110) for compressor (101) with gas-liquid separator or the new gas-liquid separator added.
4. a kind of defrost system for air source heat pump according to claim 3, it is characterized in that: described gas-liquid separator (110) for compressor (101) with gas-liquid separator time, gas-liquid separator (110) with heater (109) for inserting wherein electrically heated rod.
5. a kind of defrost system for air source heat pump according to claim 3, it is characterized in that: when described gas-liquid separator (110) is the new gas-liquid separator added, gas-liquid separator (110) with heater (109) for inserting wherein electrically heated rod or being wrapped in the electrical heating wire on gas-liquid separator (110) surface.
6. a kind of defrost system for air source heat pump according to claim 1, it is characterized in that: described gas-liquid separator (110) is heated by heater (109), heat required for defrosting is provided during defrosting, meets the demand of indoor thermic load simultaneously; When air source heat pump normally works, improve the evaporating temperature of outdoor heat exchanger (108) during heater (109) heating, outdoor heat exchanger (108) surperficial frosting can be slowed down, play the effect of resistance frost; When outdoor temperature reduces, as indoor heating quantity not sufficient, heater plays the effect of auxiliary heating.
7. a kind of defrost system for air source heat pump according to claim 1, it is characterized in that: described one-way throttle valve (107) when defrosting, guarantee from the saturated refrigerant gas in gas-liquid separator (110) enter injector (106) by injection refrigerant inlet; At the end of defrosting, the cold-producing medium that one-way throttle valve (107) can prevent throttling arrangement 104 from exporting directly enters gas-liquid separator (110).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510036731.6A CN104634020B (en) | 2015-01-23 | 2015-01-23 | Defrosting system for air source heat pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510036731.6A CN104634020B (en) | 2015-01-23 | 2015-01-23 | Defrosting system for air source heat pump |
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| CN104634020A true CN104634020A (en) | 2015-05-20 |
| CN104634020B CN104634020B (en) | 2017-02-22 |
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| CN201510036731.6A Active CN104634020B (en) | 2015-01-23 | 2015-01-23 | Defrosting system for air source heat pump |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105805981A (en) * | 2016-05-23 | 2016-07-27 | 华北理工大学 | Dual-operation compression-ejection heat pump air conditioner system |
| CN105928265A (en) * | 2016-05-31 | 2016-09-07 | 广东美的制冷设备有限公司 | Air conditioner system and defrosting control method thereof |
| CN105972773A (en) * | 2016-05-31 | 2016-09-28 | 广东美的制冷设备有限公司 | Air conditioning system and defrosting control method thereof |
| CN106016809A (en) * | 2016-05-31 | 2016-10-12 | 广东美的制冷设备有限公司 | Air conditioning system and defrosting control method thereof |
| CN107144060A (en) * | 2017-05-16 | 2017-09-08 | 天津大学 | Utilize the mobile reciprocation type heat pump defrosting system of compressed air |
| JP2017227427A (en) * | 2016-06-16 | 2017-12-28 | 株式会社デンソー | Refrigeration cycle device |
| CN108278791A (en) * | 2018-01-19 | 2018-07-13 | 江苏科技大学 | The air source air conditioning system and Defrost method of Two-cuff Technique device |
| WO2021077915A1 (en) * | 2019-10-23 | 2021-04-29 | 珠海格力电器股份有限公司 | Continuous heating control system and method, and air-conditioning device |
| WO2021169533A1 (en) * | 2020-02-26 | 2021-09-02 | 珠海格力电器股份有限公司 | Refrigerant heating control method and apparatus capable of improving stability, and air conditioning device |
| CN113335016A (en) * | 2021-05-08 | 2021-09-03 | 西安交通大学 | Injector module for new energy vehicle and transcritical CO2Heat pump air conditioning system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105805981A (en) * | 2016-05-23 | 2016-07-27 | 华北理工大学 | Dual-operation compression-ejection heat pump air conditioner system |
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| CN107144060A (en) * | 2017-05-16 | 2017-09-08 | 天津大学 | Utilize the mobile reciprocation type heat pump defrosting system of compressed air |
| CN108278791A (en) * | 2018-01-19 | 2018-07-13 | 江苏科技大学 | The air source air conditioning system and Defrost method of Two-cuff Technique device |
| CN108278791B (en) * | 2018-01-19 | 2020-02-21 | 江苏科技大学 | Air source air conditioning system with double heat storage devices and defrosting method |
| WO2021077915A1 (en) * | 2019-10-23 | 2021-04-29 | 珠海格力电器股份有限公司 | Continuous heating control system and method, and air-conditioning device |
| WO2021169533A1 (en) * | 2020-02-26 | 2021-09-02 | 珠海格力电器股份有限公司 | Refrigerant heating control method and apparatus capable of improving stability, and air conditioning device |
| CN113335016A (en) * | 2021-05-08 | 2021-09-03 | 西安交通大学 | Injector module for new energy vehicle and transcritical CO2Heat pump air conditioning system and method |
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| CN104634020B (en) | 2017-02-22 |
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