CN106766316A - A kind of Gas-supplying enthalpy-increasing CO suitable for cold district2Part overlapping heat pump - Google Patents
A kind of Gas-supplying enthalpy-increasing CO suitable for cold district2Part overlapping heat pump Download PDFInfo
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- CN106766316A CN106766316A CN201611202686.8A CN201611202686A CN106766316A CN 106766316 A CN106766316 A CN 106766316A CN 201611202686 A CN201611202686 A CN 201611202686A CN 106766316 A CN106766316 A CN 106766316A
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- Prior art keywords
- heat pump
- gas
- increasing
- compressor
- heat
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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
- 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
-
- 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
-
- 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
- F25B41/40—Fluid line arrangements
-
- 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
Abstract
The present invention provides a kind of Gas-supplying enthalpy-increasing CO suitable for cold district2Part overlapping heat pump, it includes CO2Heat pump and the second heat pump, wherein, CO2Heat pump is low-temperature level, and it includes the CO being sequentially connected2Compressor, gas cooler, evaporative condenser, first throttle device, flash vessel, second throttling device, evaporator and fluid gas separating device；Second heat pump is high-temperature level, and it includes the second compressor, the second condenser, the 3rd throttling arrangement and the evaporative condenser that are sequentially connected；CO2Heat pump is combined with the second heat pump by devaporizer overlapping, CO2Heat pump is absorbed heat by evaporative condenser heat release, the second heat pump by the evaporative condenser；Flash vessel also with CO2Compressor is connected carries out CO with to it2The supplement of gas.Heat pump of the invention can be realized heating and providing hot water in 35 DEG C of cold district, maintain COP and relatively low manufacturing cost higher.
Description
Technical field
Technical field is changed and utilized the invention belongs to heat energy, and in particular to a kind of Gas-supplying enthalpy-increasing suitable for cold district
CO2Part overlapping heat pump.
Background technology
In recent years, with the implementation of " coal changes electricity ", air source heat pump progresses into the life of people, but current air-source
Heat pump is difficult to meet the ultra-low temperature surroundings operation below -25 DEG C.Air source heat pump of the prior art in use when
(such as in the northeast of cold district, the Inner Mongol, Xinjiang etc.) when environment temperature is relatively low, it is impossible to fully draw the heat in environment
For heating or hot water preparing, so as to cause the Energy Efficiency Ratio of whole heat pump relatively low, energy consumption is larger, and frosting also easily occurs
Etc. unfavorable phenomenon, the service behaviour of whole system is caused to be deteriorated, it is impossible to meet user's heating, the demand of hot water preparing.Existing skill
Trans-critical cycle CO in art2Technology in heating field, because return water temperature is generally greater than 31 DEG C, it is impossible to utilize CO2It is higher in critical point
The heat that specific heat capacity is produced, therefore Energy Efficiency Ratio is not high；Freon system heating capacity sharp-decay at low ambient temperatures, and singly
The working range of one freon refrigerant is smaller, and freon cascade system needs multistage overlapping to meet cold district heating will
Ask, relatively costly, COP values are relatively low, therefore urgent need will develop a kind of new heat pump, to improve above-mentioned unfavorable feelings
Condition.
Performance degradation is serious at a temperature of there is low temperature environment due to heat pump heating/water system of the prior art, system
The hot water temperature of taking-up is not high, the technical problem such as the COP of cold district routine overlapping heat pump is relatively low or relatively costly, therefore this hair
Bright research and design goes out a kind of Gas-supplying enthalpy-increasing CO suitable for cold district2Part overlapping heat pump.
The content of the invention
Therefore, the technical problem to be solved in the present invention is to overcome heat pump heating system of the prior art to exist in low temperature
Performance degradation is seriously under environment temperature, hot water preparing temperature is not high, conventional overlapping heat pump COP is relatively low and relatively costly lacks
Fall into, so as to provide a kind of Gas-supplying enthalpy-increasing CO suitable for cold district2Part overlapping heat pump.
The present invention provides a kind of Gas-supplying enthalpy-increasing CO suitable for cold district2Part overlapping heat pump, it includes CO2Heat pump system
System and the second heat pump, wherein,
The CO2Heat pump is low-temperature level, and it includes the CO being sequentially connected2Compressor, gas cooler, evaporative condenser
Device, first throttle device, flash vessel, second throttling device, evaporator and fluid gas separating device；
Second heat pump is high-temperature level, the second compressor that it includes being sequentially connected, the second condenser, Section three
Stream device and evaporative condenser；
The CO2Heat pump is combined with second heat pump by devaporizer overlapping, the CO2
Heat pump is absorbed heat by the evaporative condenser heat release, second heat pump by the evaporative condenser；And
The flash vessel also with the CO2Compressor is connected to it supplement the CO of medium temperature and medium pressure2。Preferably, it is described
Flash vessel is the CO2The CO of compressor supplement2The temperature of gas is 35-50 DEG C, and pressure is 4-6MPa.
Preferably, the CO2Heat pump also include regenerator, its respectively with the CO2Compressor, evaporative condenser,
One throttling arrangement and fluid gas separating device are connected.
Preferably, the gas cooler is arranged on the upward refrigerant end of the evaporative condenser.
Preferably, R245fa, R134a are used in second heat pump as refrigerant.
Preferably, first throttle device, second throttling device and the 3rd throttling arrangement are choke valve or injector.
A kind of Gas-supplying enthalpy-increasing CO suitable for cold district that the present invention is provided2Part overlapping heat pump has following beneficial effect
Really：
1. CO described in patent of the present invention2System circulation is defined dual-stage servo system, first applies in CO Gas-supplying enthalpy-increasing technology2Across
Critical heat pump, under ultralow-temperature operation conditions, increased the mass flow in gas cooler, break through tradition CO2Trans-critical cycle heat
The drawback such as pumping system cold operation Energy Efficiency Ratio is low, pressure at expulsion is high, can heat and carry at a temperature of -35 DEG C of ultra-low temperature surroundings
Domestic hot-water supply, keeps COP higher, further, since system employs Gas-supplying enthalpy-increasing technology, reduces making for a compressor
With, therefore its more conventional CO2Dual-stage servo system greatly reduces cost.
2. the Gas-supplying enthalpy-increasing CO suitable for cold district that the present invention is provided2Part overlapping heat pump is cold using two-part gas
But device, the refrigerant circulation of the second heat pump make use of CO2The low-grade energy of critical end, both improves CO2Trans-critical cycle heat pump
System (CO2Air cooler outlet temperature is dropped to below critical point) COP again from suitable refrigerant (according to physical properties)
Low-grade energy is converted into high-grade energy, high-temperature water outlet, high-temperature tempering under ultralow-temperature operation conditions is realized；
3. the Gas-supplying enthalpy-increasing CO suitable for cold district that the present invention is provided2Part overlapping heat pump is entered using flash vessel pattern
Row Gas-supplying enthalpy-increasing so that the amount of parts in high pressure falls below minimum, reduces cost；
4. the Gas-supplying enthalpy-increasing CO suitable for cold district that the present invention is provided2Part overlapping heat pump, can be in -35 DEG C cold
Under the conditions of run, realize heating while thermobiosis hot water can also be provided；
5. the Gas-supplying enthalpy-increasing CO suitable for cold district that the present invention is provided2Part overlapping heat pump, by condenser and gas
Cooler progressively heat hot water, the cascade utilization energy successively, remain that refrigerant has the less temperature difference with water, reduce (fire is used)
Loss.
Brief description of the drawings
Fig. 1 is a kind of Gas-supplying enthalpy-increasing CO suitable for cold district of the invention2The structural representation of part overlapping heat pump.
Reference is expressed as in figure：
1—CO2Compressor, 2- gas coolers, 3- devaporizers, 4- regenerators, 5-first throttle device, 6-dodge
Steaming device, 7-second throttling device, 8-evaporator, 9-fluid gas separating device, the compressors of 10- second, the condensers of 11- second,
The throttling arrangements of 12- the 3rd, 13- shell-and-tube heat exchangers.
Specific embodiment
The invention provides a kind of Gas-supplying enthalpy-increasing CO suitable for cold district2Part overlapping heat pump, it can be in cold
Area operation, realizes heating demands and provides domestic hot-water.
Fig. 1 shows the Gas-supplying enthalpy-increasing CO suitable for cold district of the present invention2The structural representation of part overlapping heat pump
Figure.As shown in figure 1, it includes CO2Heat pump and the second heat pump, wherein, the CO2Heat pump is low-temperature level, its bag
Include the CO being sequentially connected2Compressor 1, gas cooler 2, evaporative condenser 3, first throttle device 5, flash vessel 6, second throttle
Device 7, evaporator 8 and fluid gas separating device 9；Second heat pump is high-temperature level, and it includes the second pressure being sequentially connected
Contracting machine 10, the second condenser 11, the 3rd throttling arrangement 12 and evaporative condenser 3；The CO2Heat pump and second heat pump
System is combined by the overlapping of devaporizer 3；Wherein described second heat pump is evaporated by the evaporative condenser 3
Heat absorption, the CO2Heat pump cools down heat release (i.e. CO by the evaporative condenser 32Heat pump and the second heat pump cycle system
Altogether with the evaporative condenser 3).The import connection heating system import of the second condenser 11, outlet connection CO2Air cooler 2,
CO2The outlet connecting pipe shell heat exchanger 13 of air cooler 2, the outlet connection heating system of shell-and-tube heat exchanger 13, provides the user confession
Warm demand.There is coil pipe import to connect running water inlet in shell-and-tube heat exchanger 13, outlet connection user provides the user life heat
Water.
In the CO2In heat pump, the CO2Compressor 1 is specially with the connection of fluid gas separating device 9：CO2Compression
The gas outlet of the import connection fluid gas separating device 9 of machine 1, the bottom oil separating opening of oil return opening connection fluid gas separating device 9.Additionally,
The flash vessel 6 also with the CO2Compressor 1 is connected carries out CO with to it2The supplement of gas, realizes the function of Gas-supplying enthalpy-increasing.
Gas-supplying enthalpy-increasing CO suitable for cold district of the invention2Part overlapping heat pump uses the CO of superposition type2Heat pump
With the second heat pump, and in CO2Using gas cooler and the connection side of evaporative condenser two-stage type heat release in heat pump
Formula, realizes high-temperature water outlet, high-temperature tempering, overcomes existing CO2COP relatively low defect when heat pump return water temperature is high.System
System low-temperature end uses CO2Refrigerant, can overcome heat pump of the prior art performance degradation at a temperature of low temperature environment serious
Defect so that stable system performance and system energy efficiency maintains level higher, CO all the time2Have in worst cold case superior
Thermophysical property：CO2Evaporation latent heat it is larger, refrigerating effect per unit swept volume is high, and (at -40 DEG C, refrigerating effect per unit swept volume is NH3
9.43 times)；CO2Kinematic viscosity it is low (kinematic viscosity of saturated liquid only has the 67% of NH3 at -40 DEG C)；CO2Thermal conductivity factor
The ratio of height, fluid density and vapour density is small, and the distribution of refrigerant is more uniform between each loop after throttling, therefore system can be fitted
Answer less than -30 DEG C of ultra-low temperature surroundings temperature.Most critical ground, creatively applies in CO Gas-supplying enthalpy-increasing technology2Trans-critical cycle heat
Pumping system, under ultralow-temperature operation conditions, increased the mass flow in gas cooler, break through tradition CO2Trans-critical cycle heat pump
Cold operation drawback, greatly improves COP, and the heat pump can solve the problem that the heating problem of extremely cold area and provide high temperature life
Hot water living.
Additionally, it is CO that flash vessel is used in the present invention2Heat pump Gas-supplying enthalpy-increasing, only with a CO2Compression function meets system
System operation demand so that the part in high pressure is dropped at least, reduces cost.Preferably, the flash vessel 6 is the CO2
The CO of the supplement of compressor 12The temperature of gas is 35-50 DEG C, and pressure is 4-6MPa.The CO2Heat pump is trans critical cycle,
The intermediate fill gas mouth of the flash vessel 6 connects CO2The gas supplementing opening of compressor 1, is the CO of its above-mentioned intermediate pressure medium temperature of supplement2Gas
Body.The gas enters CO2The gas supplementing opening recompression of compressor 1, so as to reduce CO2The power consumption of compressor 1, has reached tonifying Qi increasing
The effect of enthalpy, improves system COP.The Gas-supplying enthalpy-increasing opens flash vessel below 0 DEG C and carries out Gas-supplying enthalpy-increasing.
Preferably, the CO2Heat pump also include regenerator 4, its respectively with the CO2Compressor 1, evaporative condenser
3rd, first throttle device 5 and fluid gas separating device 9 are connected.Specifically, as shown in figure 1, the side-entrance connection of the regenerator 4
Devaporizer 3, outlet connection first throttle device 5, another side-entrance connection fluid gas separating device 9, outlet connection CO2Compression
The air entry of machine 1.By setting the regenerator, the power consumption of compressor can be reduced, further improve the COP of system.
Preferably, the gas cooler 2 is arranged on the upward refrigerant end of the evaporative condenser 3.So make to bring about the desired sensation
Body cooler is configured to first order cooler, and evaporative condenser is configured to second-stage cooler, forms the cooling of two-stage tandem formula
Exotherm, can effectively utilize CO2The high exhaust temperature of heat pump is so as to produce high-temperature-hot-water, while it is cold to reduce evaporation
The energy consumption of the power of condenser and the second heat pump；Heat of high temperature pair can be discharged by first order cooler (gas cooler)
Second condensator outlet hot water is reheated, and realizes progressively heat hot water, less (fire is used) loss, and can be by evaporation
Condenser (second-stage cooler) is exchanged heat with the second heat pump circulating system, specifically, due to the evaporation of the second heat pump
Temperature is sufficiently low, so as to effectively reduce CO2The temperature of heat pump refrigerant, and then by that can be reached more after throttling expansion
Low temperature.
Preferably, R245fa, R134a are used in second heat pump as refrigerant.The CO of patent of the present invention2Heat
Pumping system uses CO2As refrigerant, CO can be utilized2The excellent mobile performance under worst cold case of refrigerant and heat exchange property, system
Take high-temperature-hot-water.And second heat pump has recycled CO2The low-grade energy of critical end, both improves CO2Trans-critical cycle heat
Low-grade energy is converted into high-grade energy by the COP of pumping system from above-mentioned suitable refrigerant (according to physical properties) again
(COP is higher for fluorine system circulation), improves heating water return temperature.For example, in -35 DEG C of environment temperature, the steaming of the evaporator 8
- 40 DEG C of temperature of hair；During using R245fa as refrigerant, 65 DEG C of water inlets of the second condenser of overlapping high-temperature level, 70 DEG C of water outlets are (cold
Solidifying 75 DEG C of temperature), now, CO2Gas cooler 2 can reach 70 DEG C of water inlets, and 80 DEG C of water outlets can reach heating and require and can reach
To domestic water requirement.Certainly, it will be apparent to a skilled person that except above-mentioned refrigerant, other existing middle height
Warm refrigerant is also applied for the second heat pump of the invention.
Preferably, first throttle device (5), second throttling device (7) and the 3rd throttling arrangement (12) are choke valve or spray
Emitter.Certainly, it will be apparent to a skilled person that other throttling arrangements are also applied for the present invention.
The CO that patent of the present invention is provided2Heat pump can run under the cold conditions of -35 DEG C of environment temperature, the evaporator
CO in 82Reachable -40 DEG C of evaporating temperature；When realizing that heating is required, COP is more than 2.5.Patent utilization of the present invention CO2Heat pump across
Critical technology, makes CO2The outlet temperature of thermo-compression evaporation cooler 3 is less than 29 DEG C, takes full advantage of CO2The energy of heat pump Trans-critical cycle, and
And the middle and high temperature refrigerant of selection such as R245fa, R134a is used as the evaporation working medium of devaporizer 3 so that system COP is higher than general
Logical overlapping unit, and the low-grade energy at carbon dioxide low temperature can be promoted to high-grade energy, so as to realize extremely trembling with fear
The heating demands in area simultaneously provide domestic hot-water, meet the heating demands and demand of domestic water of cold district user, and will just
Investment, operating cost fall below minimum, overcome the shortcomings of that existing heat pump is present.
Those skilled in the art is it is easily understood that on the premise of not conflicting, above-mentioned each advantageous manner can be free
Ground combination, superposition.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.With
Only it is the preferred embodiment of the present invention described in upper, it is noted that for those skilled in the art, not
On the premise of departing from the technology of the present invention principle, some improvement and modification can also be made, these are improved and modification also should be regarded as this
The protection domain of invention.
Claims (6)
1. a kind of Gas-supplying enthalpy-increasing CO2 parts overlapping heat pump suitable for cold district, it is characterised in that：Including CO2Heat pump and
Second heat pump, wherein,
The CO2Heat pump is low-temperature level, and it includes the CO being sequentially connected2Compressor (1), gas cooler (2), evaporation are cold
Condenser (3), first throttle device (5), flash vessel (6), second throttling device (7), evaporator (8) and fluid gas separating device (9)；
Second heat pump is high-temperature level, the second compressor (10) that it includes being sequentially connected, the second condenser (11), the
Three throttling arrangements (12) and evaporative condenser (3)；
The CO2Heat pump is combined with second heat pump by devaporizer (3) overlapping, the CO2Heat
Pumping system is absorbed heat by the evaporative condenser (3) heat release, second heat pump by the evaporative condenser (3)；And
And
The flash vessel (6) also with the CO2Compressor (1) is connected carries out CO with to it2The supplement of gas.
2. the Gas-supplying enthalpy-increasing CO suitable for cold district according to claim 12Part overlapping heat pump, it is characterised in that：Institute
It is the CO to state flash vessel (6)2The CO of compressor (1) supplement2The temperature of gas is 35-50 DEG C, and pressure is 4-6MPa.
3. the Gas-supplying enthalpy-increasing CO suitable for cold district according to claim 1 and 22Part overlapping heat pump, its feature exists
In：The CO2Heat pump also include regenerator (4), its respectively with the CO2Compressor (1), evaporative condenser (3), first
Throttling arrangement (5) and fluid gas separating device (9).
4. the Gas-supplying enthalpy-increasing CO suitable for cold district according to claim 1 and 22Part overlapping heat pump, its feature exists
In：Gas cooler (2) is arranged on the upward refrigerant end of the evaporative condenser (3).
5. the Gas-supplying enthalpy-increasing CO suitable for cold district according to claim 1 and 22Part overlapping heat pump, its feature exists
In：Using R245fa, R134a as refrigerant in second heat pump.
6. the Gas-supplying enthalpy-increasing CO suitable for cold district according to claim 1 and 22Part overlapping heat pump, its feature exists
In：First throttle device (5), second throttling device (7) and the 3rd throttling arrangement (12) are choke valve or injector.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611202686.8A CN106766316A (en) | 2016-12-23 | 2016-12-23 | A kind of Gas-supplying enthalpy-increasing CO suitable for cold district2Part overlapping heat pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611202686.8A CN106766316A (en) | 2016-12-23 | 2016-12-23 | A kind of Gas-supplying enthalpy-increasing CO suitable for cold district2Part overlapping heat pump |
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ID=58899869
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107990580A (en) * | 2017-11-07 | 2018-05-04 | 西安交通大学 | A kind of the self-cascade heat pump system and operational mode of separating for several times injection synergy |
| CN108007007A (en) * | 2017-10-30 | 2018-05-08 | 新奥泛能网络科技股份有限公司 | Heat pump system |
| CN108489144A (en) * | 2018-01-29 | 2018-09-04 | 同济大学 | A kind of drying system using overlapping multiple heat pump |
| CN110186221A (en) * | 2019-06-27 | 2019-08-30 | 中国科学院理化技术研究所 | CO 2 trans-critical heat pump system |
| CN111550944A (en) * | 2020-04-26 | 2020-08-18 | 珠海格力电器股份有限公司 | Triple throttling enthalpy-increasing double-condensation refrigerating system, air conditioner and control method |
| CN114507508A (en) * | 2022-03-15 | 2022-05-17 | 浙江大学 | Application of heat pump mixed working medium |
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| CN107990580A (en) * | 2017-11-07 | 2018-05-04 | 西安交通大学 | A kind of the self-cascade heat pump system and operational mode of separating for several times injection synergy |
| CN108489144A (en) * | 2018-01-29 | 2018-09-04 | 同济大学 | A kind of drying system using overlapping multiple heat pump |
| CN110186221A (en) * | 2019-06-27 | 2019-08-30 | 中国科学院理化技术研究所 | CO 2 trans-critical heat pump system |
| CN111550944A (en) * | 2020-04-26 | 2020-08-18 | 珠海格力电器股份有限公司 | Triple throttling enthalpy-increasing double-condensation refrigerating system, air conditioner and control method |
| CN111550944B (en) * | 2020-04-26 | 2024-03-29 | 珠海格力电器股份有限公司 | Triple throttling enthalpy-increasing double-condensation refrigerating system, air conditioner and control method |
| CN114507508A (en) * | 2022-03-15 | 2022-05-17 | 浙江大学 | Application of heat pump mixed working medium |
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