CN106225319A - A kind of double evaporating temperatures refrigeration and heat pump air conditioner unit and the method for back-heating type non-azeotropic mixed working medium - Google Patents
A kind of double evaporating temperatures refrigeration and heat pump air conditioner unit and the method for back-heating type non-azeotropic mixed working medium Download PDFInfo
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- CN106225319A CN106225319A CN201610600422.1A CN201610600422A CN106225319A CN 106225319 A CN106225319 A CN 106225319A CN 201610600422 A CN201610600422 A CN 201610600422A CN 106225319 A CN106225319 A CN 106225319A
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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
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
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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
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
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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
- F25B40/00—Subcoolers, desuperheaters or superheaters
- F25B40/06—Superheaters
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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
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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
Abstract
The invention discloses a kind of double evaporating temperatures refrigeration and heat pump air conditioner unit and the method for back-heating type non-azeotropic mixed working medium, including for sucking gaseous refrigerant and being compressed the compressor of output, it is connected to the gas-liquid separator of compressor air suction entrance, also includes regenerator, be connected to exhaust outlet of compressor for condenser that mixed non-azeotropic refrigerant condenses；The outlet of described condenser is connected to separate the dephlegmator of refrigerant air-liquid two-phase mixture；Described regenerator connects dephlegmator, gas-liquid separator, high-temperature evaporator, second throttle and cryogenic vaporizer respectively.The present invention stable operation can differ bigger application scenario in big temperature difference working condition, i.e. condensation temperature with evaporating temperature.
Description
Technical field
The invention belongs to refrigeration, air-conditioning and technical field of heat pumps, a kind of back-heating type non-azeotropic mixed working medium double
Evaporating temperature refrigeration and heat pump air conditioner unit.
Background technology
In shortage of resources, today that environmental pollution is the most serious, heat pump assembly has input by energy output ratio high due to it
The more heat of quality energy, and of increasing concern.And conventional heat pump uses single stage compress, the real work temperature difference and condensation temperature
The difference of degree evaporating temperature only has 40 DEG C-50 DEG C, and for needing the workplace of the big temperature difference, ratio is if desired for middle high-temperature-hot-water or outdoor
When ambient temperature is on the low side, conventional heat pump device heating performance is low and the problem such as poor reliability.In order to solve the problems referred to above, existing skill
Art has employing Two-stage Compression and cascade type heat pump scheme, and compressor carries out the middle mode such as jet or hydrojet, and can take
Obtaining reasonable effect, but there is system and control complexity, cost is high and can not realize the deficiencies such as double evaporating temperatures.Additionally, also have
Use mixed non-azeotropic refrigerant scheme, in heat pump, be i.e. filled with two kind and the above cold-producing medium mixing different by boiling point
Zeotrope as cold-producing medium, when heat supply temperature is higher, heighten heat pump circuit circulates in mixed working fluid high
The composition ratio of boiling point refrigerant (two-story valley and life, Jian Shan pacifies a man of virtue and ability. liquid circulation heating system. and application number:
201010108289.0).Although this invention has and certain raises the ability of operational difference of improving along with load, but this device is adjusted
Adjusting range is limited, and regulation and control system is complicated.
And need now the occasion of double evaporating temperature also to get more and more, such as refrigerating chamber and cold room.Traditional unitary system
Cryogen will necessarily make suction pressure of compressor reduce for realizing double evaporating temperature, makes systematic function reduce, or the most each with one
Set refrigeration plant, causes waste.B.A. holding lattice utilizes the characteristic of non-azeotropic refrigerant to invent a kind of Dual-evaporator refrigeration system
(B.A. holds lattice. utilize the Dual-evaporator refrigeration system of non-azeotropic refrigerant mixture. and application number: 201380030271.5), joint
Double evaporating temperature can be effectively provided.If but two evaporating temperature differences are too big, and compressor may be made to suck
Containing drop in refrigerant vapour.On compressor suction duct, add two regenerative apparatuses for this fish sword beautiful jade et al., solve
The problems referred to above (fish sword beautiful jade, Wang Xiao, Lv little Long, Yan Gang. for the non-azeotrope hydrocarbon mixture self-cascade refrigeration system of two-storage temperature refrigerator
System. application number: 201310450218.2), but considerably increase the complexity of unit and reduce the reliability of application.
Summary of the invention
The double evaporating temperatures refrigeration that it is an object of the invention to provide a kind of back-heating type non-azeotropic mixed working medium is empty with heat pump
Adjust unit and method, to realize reliability service under bigger operational difference, moreover it is possible to realize two kinds of different evaporating temperatures or
Efficiently heat or refrigerating operaton under the conditions of two kinds of different grade low-temperature heat sources, and make system structure simplification, reliability improve.
The technical solution realizing the object of the invention is: double evaporating temperature systems of a kind of back-heating type non-azeotropic mixed working medium
H and c pump is air conditioning unit, and including one for sucking gaseous refrigerant and being compressed the compressor of output, one is connected to
The gas-liquid separator of compressor air suction entrance, also include regenerator, one be connected to exhaust outlet of compressor for non-azeotrope mix
The condenser of cold-producing medium condensation；
The outlet of described condenser connects one for the dephlegmator separating refrigerant air-liquid two-phase mixture, this dephlegmator
Liquid-phase outlet connect a first throttle valve throttled for liquid rich in high boiling component cold-producing medium, this first throttle valve
Outlet connects one for the high-temperature evaporator rich in high boiling component refrigerant liquid evacuator body；
Described regenerator connects dephlegmator, gas-liquid separator, high-temperature evaporator, second throttle and low-temperature evaporation respectively
Device；The isolated gas phase of described dephlegmator enters regenerator condensation rich in low boiling component refrigerant gas, then through second section
Stream valve throttling, enter cryogenic vaporizer evaporation, formed low-temp low-pressure rich in low boiling component refrigerant gas, and with high temperature steam
That sends out device outlet enters regenerator rich in after the mixing of high boiling component low pressure refrigerant gas, exports with dephlegmator in regenerator
High Temperature High Pressure, rich in low boiling component refrigerant heat exchanger, finally enters gas-liquid separator.
The present invention compared with prior art, its remarkable advantage: (1) present invention can stable operation in the big temperature difference work bar
Part, i.e. condensation temperature differ bigger application scenario with evaporating temperature；(2) gas phase that in the present invention, dephlegmator separates is rich in low boiling
Point component refrigerants in regenerator with compressor low-temp low-pressure air-breathing heat exchange and condense, reduce tradition self-cascade heat pump in cold
The solidifying vaporizer requirement to condensator outlet mass dryness fraction, and add the suction superheat of compressor, beneficially refrigerating/heat pump and follow
The reliability service of ring.(3) for the present invention is provided that the device of two kinds of evaporating temperatures compared to other, structure is the simplest, fortune
Row is the most reliable, regulates the most flexible.
Below in conjunction with the accompanying drawings the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is that double evaporating temperatures refrigeration of the back-heating type non-azeotropic mixed working medium of the present invention is shown with heat pump air conditioner unit structure
It is intended to.
Fig. 2 is double evaporating temperatures refrigeration and the heat pump air conditioner unit principle of the back-heating type non-azeotropic mixed working medium of the present invention
Figure.
Fig. 3 be the back-heating type non-azeotropic mixed working medium of the present invention double evaporating temperature heat pumps and refrigeration air-conditioning unit temperature-
Concentration map
Detailed description of the invention
In conjunction with Fig. 1, double evaporating temperatures refrigeration of back-heating type non-azeotropic mixed working medium of the present invention is permissible with heat pump air conditioner unit
Two kinds of different evaporating temperatures are provided, are particularly suited for big operational difference or need the refrigeration applications of two kinds of evaporating temperatures
Or there is the heat pump applications of double thermal source, including one for sucking gaseous refrigerant and being compressed the compressor of output
101, a gas-liquid separator 102 being connected to compressor 101 Suction gas inlet, it is characterised in that: also include regenerator 107,
Individual compressor 101 air vent that is connected to is for condenser 103 that mixed non-azeotropic refrigerant condenses；
The outlet of described condenser 103 connects a dephlegmator 104 being used for separating refrigerant air-liquid two-phase mixture, should
The liquid-phase outlet of dephlegmator 104 connects one and is used for the first throttle valve 105 that liquid throttles rich in high boiling component cold-producing medium, should
The outlet of first throttle valve 105 connects one for the high-temperature evaporator 106 rich in high boiling component refrigerant liquid evacuator body；
Described regenerator 107 connects dephlegmator 104, gas-liquid separator 102, high-temperature evaporator 106, second throttle respectively
108 and cryogenic vaporizer 109；The described isolated gas phase of dephlegmator 104 enters backheat rich in low boiling component refrigerant gas
Device 107 condenses, and then throttles through second throttle 108, enter cryogenic vaporizer 109 evaporate, formed low-temp low-pressure rich in low
Boiling point component refrigerant gas, and with high-temperature evaporator 106 outlet mix rich in high boiling component low pressure refrigerant gas after
Enter regenerator 107, regenerator 107 exports High Temperature High Pressure with dephlegmator 104 rich in low boiling component refrigerant heat exchanger,
Rear entrance gas-liquid separator 102.
The cold-producing medium of the present invention uses mixed non-azeotropic refrigerant, typically has the two or more refrigeration of different boiling temperature
Agent is constituted in the mixing of usual ratio and is had certain sliding temperature difference.
The outlet refrigerant condition of the condenser 103 of the present invention is gas-liquid two-phase, wherein the condensation of high boiling component major part
Becoming liquid, low boiling component major part is still in high pressure gaseous.
Described high-temperature evaporator 106 and cryogenic vaporizer 109 are the vaporizer that bubble point temperature is different, high-temperature evaporator 106
In by rich in high boiling component cold-producing medium evaporation endothermic, there is higher bubble point temperature；By rich in low boiling in cryogenic vaporizer 109
Point component refrigerants evaporation endothermic, has relatively low bubble point temperature.Refer to become containing low boiling rich in low boiling component cold-producing medium
Divide amount of refrigerant higher.
The cold-producing medium having two states in described regenerator 107 carries out heat exchange: one be dephlegmator 104 isolated rich in
The high temperature and high pressure gas of low boiling component cold-producing medium, it two is that high-temperature evaporator 106 is low with the low exit temperature of cryogenic vaporizer 109
Compression refrigerant admixture of gas, finally makes the isolated High Temperature High Pressure gas rich in low boiling component cold-producing medium of dephlegmator 104
Body condenses.
First throttle valve 105 and the second throttle 108 of the present invention use electric expansion valve, heating power expansion valve, capillary tube
Or orifice control valve.
Double evaporating temperatures refrigeration of back-heating type non-azeotropic mixed working medium of the present invention sucks with heat pump method, i.e. compressor 101
Gaseous state mixed non-azeotropic refrigerant compresses and exports condenser 103 and condenses, and condensed cold-producing medium is isolated by dephlegmator 104
Refrigerant air-liquid two-phase mixture, at the liquid-phase outlet of dephlegmator 104 by first throttle valve 105 to liquid rich in high boiling component
Cold-producing medium throttles, and after throttling, cold-producing medium is at high-temperature evaporator 106 evaporation and heat-exchange, has higher bubble point temperature；
Entered regenerator 107 by the isolated gas phase of dephlegmator 104 rich in low boiling component refrigerant gas to condense, then
Throttling through second throttle 108, after throttling, cold-producing medium enters cryogenic vaporizer 109 evaporation and heat-exchange, has relatively low bubble point temperature, shape
Become the rich in low boiling component refrigerant gas and low rich in high boiling component with what high-temperature evaporator 106 exported of low-temp low-pressure
In regenerator 107, export High Temperature High Pressure with dephlegmator 104 after the mixing of compression refrigerant gas to change rich in low boiling component cold-producing medium
Heat, finally enters gas-liquid separator 102 and carries out gas-liquid separation, and isolated gas enters pressure from the outlet of gas-liquid separator 102
Contracting machine 101；
Described high-temperature evaporator 106 is equal with cryogenic vaporizer 109 inner refrigerant pressure, and cold-producing medium bubble point temperature is different,
Constitute double evaporating temperature system.
Below in conjunction with Fig. 2 and Fig. 3, the invention will be further described.
Double evaporating temperature heat pump/refrigeratings of the back-heating type non-azeotropic mixed working medium of the present invention are air conditioning unit include one for
Sucking gaseous refrigerant and be compressed the compressor 101 of output, its outlet refrigerant condition is corresponding to the state point 2 in Fig. 3
Point；One gas-liquid separator 102 being connected to compressor 101 Suction gas inlet.Double evaporations of described back-heating type non-azeotropic working medium
Temperature heat pump air conditioner unit also includes that one is connected to what compressor 101 air vent condensed for zeotrope cold-producing medium
Condenser 103, compressor air-discharging is condensed to state point 3 point by it；The outlet of condenser 103 is connected to one for separating cold-producing medium
The dephlegmator 104 of gas-fluid two-phase mixture, described dephlegmator the cold-producing medium that state point is 3 is separated into saturated liquid phase 4 and
Saturated gas phase 5 point；The liquid-phase outlet of dephlegmator 104 is connected to first throttled for liquid rich in high boiling component cold-producing medium
Choke valve 105 so that the cold-producing medium being positioned at state point 4 throttles to 6 points；One for rich in high boiling component refrigerant liquid
The high-temperature evaporator 106 of evaporation, is evaporated to state point 7 point rich in high boiling component refrigerant liquid after throttling；Dephlegmator 104
Isolated gas phase enters regenerator 107 rich in low boiling component refrigerant gas and condenses to state point 8 point；Then through second section
Stream valve 108 throttles to state point 9 point；Enter cryogenic vaporizer 109 and be evaporated to state point 10 point, formed low-temp low-pressure rich in low
Boiling point component refrigerant gas, and with high-temperature evaporator 106 outlet rich in high boiling component low pressure refrigerant gas mix to
State point 11, is then passed through regenerator 107 and exports High Temperature High Pressure rich in low boiling component refrigerant heat exchanger to shape with dephlegmator 104
State point 1, finally enters gas-liquid separator 102.
The outlet refrigerant condition of the condenser 103 of the present invention is gas-liquid two-phase, and wherein high boiling component almost all is cold
Congealing into liquid, low boiling component is almost still in high pressure gaseous, and the state of condensator outlet cold-producing medium is corresponding in Fig. 3
Point 3, condensation temperature TcmFor in Fig. 3 between point 2 and point 3 temperature between a certain temperature.
The high-temperature evaporator 106 of the present invention and cryogenic vaporizer 109 are the vaporizer that bubble point temperature is different, high-temperature evaporator
By rich in high boiling component cold-producing medium evaporation endothermic in 106, there is higher bubble point temperature, this temperature Te1For in Fig. 3 between point 6
And a certain temperature put between 7 temperature；By rich in low boiling component cold-producing medium evaporation endothermic in cryogenic vaporizer 109, have relatively
Low bubble point temperature, this temperature Te2For in Fig. 3 between point 9 and point 10 temperature between a certain temperature.
The cold-producing medium having two states in the regenerator 107 of the present invention carries out heat exchange: one is that described dephlegmator 104 separates
The high temperature and high pressure gas rich in low boiling component cold-producing medium gone out, it two is described high-temperature evaporator 106 and cryogenic vaporizer 109
Low exit temperature low pressure refrigerant gas mixture.Finally make described dephlegmator 104 isolated rich in low boiling component system
The high temperature and high pressure gas of cryogen is condensed into liquid, and described regenerator 107 can serve as the effect of similar condenser/evaporator, can increase again
Add compressor 101 and suck the degree of superheat of low temperature and low pressure steam, prevent absorbing gas belt liquid.
Claims (7)
1. double evaporating temperatures of back-heating type non-azeotropic mixed working medium are freezed and a heat pump air conditioner unit, including one for sucking
Gaseous refrigerant is also compressed the compressor (101) exported, a gas-liquid separation being connected to compressor (101) Suction gas inlet
Device (102), it is characterised in that: also include regenerator (107), one be connected to compressor (101) air vent for non-azeotrope mix
Close the condenser (103) of cold-producing medium condensation；
The outlet of described condenser (103) connects a dephlegmator (104) being used for separating refrigerant air-liquid two-phase mixture, should
The liquid-phase outlet of dephlegmator (104) connects one and is used for the first throttle valve that liquid throttles rich in high boiling component cold-producing medium
(105), the outlet of this first throttle valve (105) connects one for the high temperature steaming rich in high boiling component refrigerant liquid evacuator body
Send out device (106)；
Described regenerator (107) connects dephlegmator (104), gas-liquid separator (102), high-temperature evaporator (106), second section respectively
Stream valve (108) and cryogenic vaporizer (109)；Described dephlegmator (104) isolated gas phase is rich in low boiling component cold-producing medium gas
Body enters regenerator (107) condensation, then throttles through second throttle (108), enters cryogenic vaporizer (109) evaporation, is formed
Low-temp low-pressure rich in low boiling component refrigerant gas and low rich in high boiling component with what high-temperature evaporator (106) exported
Regenerator (107) is entered after the mixing of compression refrigerant gas, rich with dephlegmator (104) outlet High Temperature High Pressure in regenerator (107)
Containing low boiling component refrigerant heat exchanger, finally enter gas-liquid separator (102).
Double evaporating temperature heat pumps of back-heating type non-azeotropic mixed working medium the most according to claim 1 and refrigeration air-conditioning unit,
It is characterized in that: described cold-producing medium uses mixed non-azeotropic refrigerant.
Double evaporating temperature heat pumps of back-heating type non-azeotropic mixed working medium the most according to claim 1 and 2 and refrigerating and air-conditioning
Group, it is characterised in that: the outlet refrigerant condition of described condenser (103) is gas-liquid two-phase, and wherein high boiling component is condensed into
Liquid, low boiling component is still in high pressure gaseous.
Double evaporating temperature heat pumps of back-heating type non-azeotropic mixed working medium the most according to claim 1 and 2 and refrigerating and air-conditioning
Group, it is characterised in that: described high-temperature evaporator (106) and cryogenic vaporizer (109) are the vaporizer that bubble point temperature is different, high temperature
By rich in high boiling component cold-producing medium evaporation endothermic in vaporizer (106), there is higher bubble point temperature；Cryogenic vaporizer
(109) by rich in low boiling component cold-producing medium evaporation endothermic in, there is relatively low bubble point temperature.
Double evaporating temperature heat pumps of back-heating type non-azeotropic mixed working medium the most according to claim 1 and 2 and refrigerating and air-conditioning
Group, it is characterised in that: described regenerator (107) there is the cold-producing medium of two states carry out heat exchange: one is dephlegmator (104) point
The high temperature and high pressure gas rich in low boiling component cold-producing medium separated out, it two is high-temperature evaporator (106) and cryogenic vaporizer
(109) low exit temperature low pressure refrigerant gas mixture, finally makes dephlegmator (104) isolated rich in low boiling component
The high temperature and high pressure gas condensation of cold-producing medium.
Double evaporating temperature heat pumps of back-heating type non-azeotropic mixed working medium the most according to claim 1 and 2 and refrigerating and air-conditioning
Group, it is characterised in that: first throttle valve (105) and second throttle (108) use electric expansion valve, heating power expansion valve, capillary
Pipe or orifice control valve.
7. double evaporating temperatures of a back-heating type non-azeotropic mixed working medium are freezed and heat pump method, it is characterised in that: compressor
(101) sucking gaseous state mixed non-azeotropic refrigerant compress and export condenser (103) condensation, condensed cold-producing medium is by fractional distillation
Refrigerant air-liquid two-phase mixture isolated by device (104), right by first throttle valve (105) at the liquid-phase outlet of dephlegmator (104)
Liquid throttles rich in high boiling component cold-producing medium, and after throttling, cold-producing medium is at high-temperature evaporator (106) evaporation and heat-exchange, has higher bubble
Point temperature；
Regenerator (107) condensation is entered rich in low boiling component refrigerant gas, then by dephlegmator (104) isolated gas phase
Throttling through second throttle (108), after throttling, cold-producing medium enters cryogenic vaporizer (109) evaporation and heat-exchange, has relatively low bubble point temperature
Degree, formed low-temp low-pressure rich in low boiling component refrigerant gas, and with high-temperature evaporator (106) export rich in high boiling point
In regenerator (107), High Temperature High Pressure is exported rich in low boiling group with dephlegmator (104) after the mixing of component low pressure refrigerant gas
Dividing refrigerant heat exchanger, finally enter gas-liquid separator (102) and carry out gas-liquid separation, isolated gas is from gas-liquid separator
(102) outlet enters compressor (101)；
Described high-temperature evaporator (106) is equal with cryogenic vaporizer (109) inner refrigerant pressure, and cold-producing medium bubble point temperature is different,
Constitute double evaporating temperature system.
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| CN201610600422.1A CN106225319A (en) | 2016-07-27 | 2016-07-27 | A kind of double evaporating temperatures refrigeration and heat pump air conditioner unit and the method for back-heating type non-azeotropic mixed working medium |
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| CN201610600422.1A CN106225319A (en) | 2016-07-27 | 2016-07-27 | A kind of double evaporating temperatures refrigeration and heat pump air conditioner unit and the method for back-heating type non-azeotropic mixed working medium |
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| CN106766301A (en) * | 2017-01-23 | 2017-05-31 | 浙江和利制冷设备有限公司 | Energy saving ultralow temperature refrigerator-freezer refrigeration system |
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