CN106766312A - Suitable for the CO of extremely cold area2The heat pump and its control method of overlapping - Google Patents
Suitable for the CO of extremely cold area2The heat pump and its control method of overlapping Download PDFInfo
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- CN106766312A CN106766312A CN201611198661.5A CN201611198661A CN106766312A CN 106766312 A CN106766312 A CN 106766312A CN 201611198661 A CN201611198661 A CN 201611198661A CN 106766312 A CN106766312 A CN 106766312A
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- Prior art keywords
- heat
- valve
- heat exchanger
- heat pump
- overlapping
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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
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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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
-
- 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
-
- 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
- F25B41/31—Expansion 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
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- 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
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/06—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The present invention provides a kind of CO suitable for extremely cold area2The heat pump and control method of overlapping, the system include carbon dioxide heat-pump cooling cycle system and common heat pump cooling cycle system；Common heat pump cooling cycle system includes the first control valve for setting gradually, ice machine, evaporative condenser, with cold and hot water- to-water heat exchanger, evaporative condenser is communicated with the second compressor by reversal valve, second compressor has been sequentially communicated cold and hot water- to-water heat exchanger and the first control valve by reversal valve, and the second expansion valve is provided between ice machine and cold and hot water- to-water heat exchanger, the refrigerant working medium of high temperature section is once exchanged heat after absorbing heat into ice machine carries out secondary heat exchange into evaporative condenser absorption low-temperature zone heat, entered reversal valve again, completion high temperature section circulation at the second expansion valve is returned to after entering hot and cold water heat exchanger after second compressor compresses, complete and heat and energy ice making simultaneously, meet the demand of ice making while heating, realize two grades of utilizations of the energy.
Description
Technical field
The present invention relates to technical field of heat pumps, more particularly, to a kind of CO suitable for extremely cold area2The heat pump system of overlapping
System and its control method.
Background technology
Heat pump be it is a kind of can be by the device of the heat energy transfer of low level heat energy to high-order thermal source, typically first from the sky of nature
Low grade heat energy is obtained in gas and water or soil, is done work by electric power, the high-grade heat that then can be utilized to people's offer again
Energy.
Specifically, CO2Overlapping heat pump can be mainly used in heating, and it has two sets of circulatory systems, such as Fig. 1 institutes
Show, a set of gas circulation 20 for being to be used as by carbon dioxide low-temperature zone, another set of is as high temperature section by freon etc.
Liquid circulation 30, and two sets of circulatory systems can be linked togather by evaporative condenser, and be in evaporative condenser and heat work
Effect under condition to realize heat exchange, heat.CO in recent years2Teat pump boiler technology quickly grows.With conventional freon heat pump
Water heater is compared, CO2Teat pump boiler can produce 90 DEG C of high-temperature-hot-water, and the hot water temperature of the freon Teat pump boiler of routine
Degree typically can only achieve 55~65 DEG C；While CO2The coefficient of performance in heating of heat pump is also higher than conventional freon heat pump cycle, can
Reach more than 4.0.
But the energy consumed in this heat pump cyclic process can only be for heating, it is impossible to meets certain customers' system
The use requirement of ice making while hot, while lacking two grades of utilizations to the energy.
The content of the invention
It is an object of the invention to provide the heat pump and its controlling party of a kind of CO2 overlappings suitable for extremely cold area
Method, can only be for heating with the energy for solving to be consumed in heat pump cyclic process present in prior art, it is impossible to meet
The use requirement of ice making while certain customers heat, while lack utilizing technical problem to two grades of the energy.
To achieve these goals, the invention provides following technical scheme；
The heat pump of the CO2 overlappings suitable for extremely cold area that the present invention is provided, including carbon dioxide heat-pump refrigeration is followed
Loop systems and common heat pump cooling cycle system；
The common heat pump cooling cycle system include set gradually first control valve, ice machine, evaporative condenser and
Cold and hot water- to-water heat exchanger, the evaporative condenser is communicated with the second compressor by reversal valve, and second compressor is by described
Reversal valve has been sequentially communicated the hot and cold water heat exchanger and the first control valve, and the ice machine exchanges heat with the hot and cold water
The second expansion valve is provided between device；
The loop of the carbon dioxide heat-pump cooling cycle system connects the first interface and second of evaporative condenser respectively
Interface；
The loop of the common heat pump cooling cycle system connects the 3rd interface and the 4th of the evaporative condenser respectively
Interface.
In the above-mentioned technical solutions, further, the outdoor heat exchanger in the carbon dioxide heat-pump cooling cycle system
It is connected with the loop of the common heat pump cooling cycle system by two connecting pipelines, and is divided on each described connecting pipeline
The first control valve is not provided with, and the 3rd interface and the 4th interface are respectively arranged with the second control valve, and its
In one it is described second control valve be arranged between the ice machine and the evaporative condenser.
In any of the above-described technical scheme, further, the carbon dioxide heat-pump cooling cycle system includes the room
External heat exchanger, internal exchanger, the first compressor and the first expansion valve；
The outdoor heat exchanger is respectively arranged with air inlet, gas outlet, first, second mouthful, the 3rd mouthful and the 4th mouthful, institute
State first to be connected with the first port of the internal exchanger by first expansion valve, the second of the internal exchanger
Port is connected with the first interface of the evaporative condenser；Described second mouthful, it is the 3rd port of the internal exchanger, described
4th port of internal exchanger and first compressor are sequentially communicated, and the compressor and the of the evaporative condenser
Two interfaces are connected；
Described 3rd mouthful and described 4th mouthful connects two connecting pipelines respectively.
In any of the above-described technical scheme, further, set between the cold and hot water- to-water heat exchanger and second expansion valve
It is equipped with the first fluid reservoir.
In any of the above-described technical scheme, further, set between the cold and hot water- to-water heat exchanger and first fluid reservoir
Unidirectional valve group is equipped with, and the unidirectional valve group is connected with second expansion valve.
In any of the above-described technical scheme, further, second compressor is controlled with the second of the 4th interface
The second fluid reservoir is provided between valve processed.
In any of the above-described technical scheme, further, the outdoor heat exchanger, the internal exchanger and described cold and hot
Water- to-water heat exchanger is respectively finned heat exchanger.
In any of the above-described technical scheme, further, the first control valve and the second control valve are respectively electricity
Magnet valve.
In any of the above-described technical scheme, further, the reversal valve is four-way reversing valve.
Present invention also offers a kind of heat-pump apparatus unit, including described in any of the above-described technical scheme suitable for extremely tremble with fear
The heat pump of the CO2 overlappings in area.
The heat-pump apparatus unit that the present invention is provided, is provided with the heat pump of the above-mentioned CO2 overlappings suitable for extremely cold area,
Therefore, whole beneficial effects of the heat pump of the CO2 overlappings suitable for extremely cold area for being provided with the present invention, herein just not
Repeat one by one.
Embodiments of the invention additionally provide a kind of controlling party of the heat pump of the CO2 overlappings suitable for extremely cold area
Method, including：
Step S1, closes first and controls valve, opens second and controls valve；
Step S2, low-temperature zone refrigerant carbon dioxide enters outdoor heat exchanger and absorbs outdoor heat by the first expansion valve；
Step S3, by entering the first compressor after internal exchanger, through the first compressor compresses；
Step S4, into evaporative condenser heat release after return to the first expansion valve complete low-temperature zone circulation；
Step S5, the refrigerant working medium of high temperature section is once exchanged heat absorption heat through the second expansion valve into ice machine；
Step S6, absorbing low-temperature zone heat into evaporative condenser carries out secondary heat exchange；
Step S7, by entering hot and cold water heat exchanger heat release after four-way reversing valve, the second compressor compresses；
Step S8, returns to the second expansion valve and completes high temperature section circulation through unidirectional valve group, the first fluid reservoir.
The present invention having the beneficial effect that compared with the prior art：
The CO suitable for extremely cold area that the present invention is provided2The heat pump of overlapping, common heat pump cooling cycle system bag
The first control valve, ice machine, evaporative condenser and the cold and hot water- to-water heat exchanger for setting gradually are included, evaporative condenser passes through reversal valve
The second compressor is communicated with, the second compressor has been sequentially communicated cold and hot water- to-water heat exchanger and the first control valve, and system by reversal valve
The second expansion valve is provided between ice maker and cold and hot water- to-water heat exchanger, the loop of carbon dioxide heat-pump cooling cycle system connects respectively
The first interface and second interface of evaporative condenser, the loop of common heat pump cooling cycle system connect evaporative condenser respectively
3rd interface and the 4th interface, enter after the refrigerant working medium of high temperature section is once exchanged heat absorption heat into ice machine and steam
The condenser that feels cold absorbs low-temperature zone (the carbon dioxide refrigeration circulatory system) heat carries out secondary heat exchange, then enters reversal valve, the second pressure
Enter after hot and cold water heat exchanger to return to after the compression of contracting machine and completed at the second expansion valve high temperature section circulation, complete and heat and can be simultaneously
Ice making, meets the demand of ice making while heating, and realizes two grades of utilizations of the energy.
Brief description of the drawings
In order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art, below will be to specific
The accompanying drawing to be used needed for implementation method or description of the prior art is briefly described, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is CO in the prior art suitable for extremely cold area2The schematic diagram of the heat pump of overlapping；
Fig. 2 is the CO suitable for extremely cold area provided in an embodiment of the present invention2The structural representation of the heat pump of overlapping；
Fig. 3 is the CO suitable for extremely cold area provided in an embodiment of the present invention2Winter heating is same in the heat pump of overlapping
When ice making flow to schematic diagram；
The CO suitable for extremely cold area that Fig. 4 is provided for another embodiment of the present invention2The controlling party of the heat pump of overlapping
The schematic flow sheet of method.
Reference：
The expansion valves of 1- first；2- outdoor heat exchangers；3- internal exchangers；The compressors of 4- first；5- first controls valve；6-
Two control valves；7- evaporative condensers；8- four-way reversing valves；The compressors of 9- second；The expansion valves of 10- second；The unidirectional valve groups of 11-；12-
Cold and hot water- to-water heat exchanger；The fluid reservoirs of 13- second；The fluid reservoirs of 14- first；15- ice machines；The gas circulation of 20- low-temperature zones；30- is high
The liquid circulation of temperature section.
Specific embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described implementation
Example is a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
In the description of the invention, it is necessary to explanation, term " " center ", " on ", D score, "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outward " be based on orientation shown in the drawings or position relationship, merely to
Be easy to the description present invention and simplify describe, rather than indicate imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.Additionally, term " first ", " second ",
" the 3rd " is only used for describing purpose, and it is not intended that indicating or implying relative importance.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Company ", " connection " should be interpreted broadly, for example, it may be being fixedly connected, or being detachably connected, or be integrally connected；Can
Being to mechanically connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, Ke Yishi
Two connections of element internal.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
Fig. 2 is the CO suitable for extremely cold area provided in an embodiment of the present invention2The structural representation of the heat pump of overlapping；
Fig. 3 is the CO suitable for extremely cold area provided in an embodiment of the present invention2Winter heating's ice making simultaneously in the heat pump of overlapping
Flow to schematic diagram；The CO suitable for extremely cold area that Fig. 4 is provided for another embodiment of the present invention2The control of the heat pump of overlapping
The schematic flow sheet of method；
As shown in Figures 2 and 3, the CO suitable for extremely cold area that embodiments of the invention are provided2The heat pump of overlapping,
Including carbon dioxide heat-pump cooling cycle system and common heat pump cooling cycle system；
The common heat pump cooling cycle system includes the first control valve 5, the ice machine 15, evaporative condenser that set gradually
7 and cold and hot water- to-water heat exchanger 12, the evaporative condenser 7 is communicated with the second compressor 9, second compressor 9 by reversal valve
By the reversal valve be sequentially communicated the hot and cold water heat exchanger 12 and it is described first control valve 5, and the ice machine 15 with
The second expansion valve 10 is provided between the cold and hot water- to-water heat exchanger 12；
The loop of the carbon dioxide heat-pump cooling cycle system connects the first interface and second of evaporative condenser 7 respectively
Interface；
The loop of the common heat pump cooling cycle system connects the 3rd interface and the 4th of the evaporative condenser 7 respectively
Interface.
The present invention having the beneficial effect that compared with the prior art：
The CO suitable for extremely cold area that embodiments of the invention are provided2The heat pump of overlapping, common heat pump refrigerating is followed
Loop systems include the first control valve 5, ice machine 15, evaporative condenser 7 and the cold and hot water- to-water heat exchanger 12 that set gradually, evaporate cold
Condenser 7 is communicated with the second compressor 9 by reversal valve, and the second compressor 9 has been sequentially communicated cold and hot water- to-water heat exchanger by reversal valve
12 and first control to be provided with the second expansion valve 10, carbon dioxide heat-pump between valve 5, and ice machine 15 and cold and hot water- to-water heat exchanger 12
The loop of cooling cycle system connects the first interface and second interface of evaporative condenser 7, common heat pump refrigeration cycle system respectively
The loop of system connects the 3rd interface and the 4th interface of evaporative condenser 7 respectively, when the refrigerant working medium of high temperature section enters ice making
Machine 15 is once exchanged heat after absorbing heat and is entered absorption low-temperature zone (the carbon dioxide refrigeration circulatory system) heat of evaporative condenser 7
Carry out secondary heat exchange, then entered enter hot and cold water heat exchanger 12 after reversal valve, the second compressor 9 compress after return to the second expansion valve
High temperature section circulation is completed at 10, is completed and is heated and energy ice making simultaneously, meet the demand of ice making while heating, realize the energy
Two grades utilization.
During practical application, specifically, the outdoor heat exchanger 2 in the carbon dioxide heat-pump cooling cycle system passes through two
Connecting pipeline is connected with the loop of the common heat pump cooling cycle system, and is respectively arranged with each described connecting pipeline
The first control valve 5, the 3rd interface and the 4th interface are respectively arranged with the second control valve 6, and one of them
The second control valve 6 is arranged between the ice machine 15 and the evaporative condenser 7.
Further, the carbon dioxide heat-pump cooling cycle system includes the outdoor heat exchanger 2, internal exchanger
3rd, the first compressor 4 and the first expansion valve 1；
The outdoor heat exchanger 2 be respectively arranged with air inlet, gas outlet, first, second mouthful, the 3rd mouthful and the 4th mouthful,
The first is connected by first expansion valve 1 with the first port of the internal exchanger 3, the internal exchanger 3
Second port be connected with the first interface of the evaporative condenser 7；Described second mouthful, the 3rd of the internal exchanger 3 the
Port, the 4th port of the internal exchanger 3 and first compressor 4 are sequentially communicated, and the compressor and the steaming
The second interface of condenser 7 of feeling cold is connected；
Described 3rd mouthful and described 4th mouthful connects two connecting pipelines respectively.
Further, the first fluid reservoir 14 is provided between the cold and hot water- to-water heat exchanger 12 and second expansion valve 10.
Further, unidirectional valve group 11 is provided between the cold and hot water- to-water heat exchanger 12 and first fluid reservoir 14, and
The unidirectional valve group 11 is connected with second expansion valve 10.
Further, it is provided with the second storage between second compressor 9 and the second control valve 6 of the 4th interface
Flow container 13.
Preferably, in order to improve heat exchange efficiency, the outdoor heat exchanger 2, the internal exchanger 3 and the hot and cold water are changed
Hot device 12 is respectively finned heat exchanger.
Preferably, it is easy to operate simple in order to realize, automatically control, the first control valve 5 and described second controls valve 6
Respectively magnetic valve.
Preferably, the reversal valve is four-way reversing valve 8.
Specifically, as shown in figure 3, as the CO for being applied to extremely cold area2The heat pump of overlapping is in winter heating simultaneously
During ice making operating mode：
Close first and control valve 5 (magnetic valve), open second and control valve 6, low-temperature zone refrigerant carbon dioxide is by first
Expansion valve 1 absorb outdoor heat into outdoor heat exchanger 2 after by after internal exchanger 3 enter the first compressor 4, through first pressure
Contracting machine 4 returns to the completion low-temperature zone circulation of the first expansion valve 1 after entering the heat release of evaporative condenser 7 after compressing；The refrigerant of high temperature section
Working medium enters evaporative condenser 7 and absorbs low-temperature zone after once being exchanged heat absorption heat into ice machine 15 through the second expansion valve 10
Heat carries out secondary heat exchange, then enters the heat release of hot and cold water heat exchanger 12 after four-way reversing valve 8, the second compressor 9 compress
The completion high temperature section of the second expansion valve 10 is returned to by unidirectional valve group 11, the first fluid reservoir 14 to circulate, ice making while realization is heated,
So as to realize two grades of utilizations of the energy.
Embodiments of the invention additionally provide a kind of heat-pump apparatus unit, including suitable described in any of the above-described technical scheme
For the CO of extremely cold area2The heat pump of overlapping.
The heat-pump apparatus unit that embodiments of the invention are provided, is provided with the above-mentioned CO suitable for extremely cold area2Overlapping
Heat pump, therefore, with the CO suitable for extremely cold area that the present invention is provided2The beneficial effect of whole of the heat pump of overlapping
Really, just do not repeat one by one herein.
As shown in figure 4, embodiments of the invention additionally provide a kind of CO suitable for extremely cold area2The heat pump of overlapping
Control method, including：
Step S1, closes first and controls valve 5, opens second and controls valve 6；
Step S2, low-temperature zone refrigerant carbon dioxide absorbs outdoor heat by the first expansion valve 1 into outdoor heat exchanger 2
Amount；
Step S3, by entering the first compressor 4 after internal exchanger 3, compresses through the first compressor 4；
Step S4, into the heat release of evaporative condenser 7 after return to the first expansion valve 1 complete low-temperature zone circulation；
Step S5, the refrigerant working medium of high temperature section is once exchanged heat into ice machine 15 through the second expansion valve 10 and is absorbed heat
Amount；
Step S6, absorbing low-temperature zone heat into evaporative condenser 7 carries out secondary heat exchange；
Step S7, the heat release of hot and cold water heat exchanger 12 is entered after four-way reversing valve 8, the second compressor 9 compress；
Step S8, returns to the second expansion valve 10 and completes high temperature section circulation through unidirectional valve group 11, the first fluid reservoir 14.
In sum, the present invention having the beneficial effect that compared with the prior art：
The CO suitable for extremely cold area that embodiments of the invention are provided2The heat pump of overlapping, common heat pump refrigerating is followed
Loop systems include the first control valve, ice machine, evaporative condenser and the cold and hot water- to-water heat exchanger that set gradually, and evaporative condenser leads to
Cross reversal valve and be communicated with the second compressor, the second compressor has been sequentially communicated cold and hot water- to-water heat exchanger and the first control by reversal valve
The second expansion valve, the loop of carbon dioxide heat-pump cooling cycle system are provided between valve, and ice machine and cold and hot water- to-water heat exchanger
The first interface and second interface of evaporative condenser are connected respectively, and the loop of common heat pump cooling cycle system connects evaporation respectively
3rd interface of condenser and the 4th interface, when the refrigerant working medium of high temperature section is once exchanged heat absorption heat into ice machine
Heat carries out secondary heat exchange to enter evaporative condenser absorption low-temperature zone (the carbon dioxide refrigeration circulatory system) afterwards, then enters commutation
Completion high temperature section circulation at the second expansion valve is returned to after entering hot and cold water heat exchanger after valve, the second compressor compresses, system is completed
Heat energy ice making simultaneously again, meets the demand of ice making while heating, and realizes two grades of utilizations of the energy.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
Pipe has been described in detail with reference to foregoing embodiments to the present invention, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.Although additionally, it will be appreciated by those of skill in the art that some embodiments described herein are implemented including other
Some included features are rather than further feature in example, but the combination of the feature of different embodiments means in the present invention
Within the scope of and form different embodiments.For example, in the following claims, embodiment required for protection
It is one of any mode to use in any combination.
Claims (10)
1. a kind of CO suitable for extremely cold area2The heat pump of overlapping, it is characterised in that followed including carbon dioxide heat-pump refrigeration
Loop systems and common heat pump cooling cycle system；
The common heat pump cooling cycle system includes the first control valve, ice machine, the evaporative condenser and cold and hot that set gradually
Water- to-water heat exchanger, the evaporative condenser is communicated with the second compressor by reversal valve, and second compressor is by the commutation
Valve be sequentially communicated the hot and cold water heat exchanger and it is described first control valve, and the ice machine and the cold and hot water- to-water heat exchanger it
Between be provided with the second expansion valve；
The loop of the carbon dioxide heat-pump cooling cycle system connects the first interface and second interface of evaporative condenser respectively；
The loop of the common heat pump cooling cycle system connects the 3rd interface and the 4th interface of the evaporative condenser respectively.
2. the CO suitable for extremely cold area according to claim 12The heat pump of overlapping, it is characterised in that
Outdoor heat exchanger in the carbon dioxide heat-pump cooling cycle system passes through two connecting pipelines and the common heat pump
The loop of cooling cycle system is connected, and the first control valve, described the are respectively arranged with each described connecting pipeline
Three interfaces and the 4th interface are respectively arranged with the second control valve, and one of them described second control valve be arranged on it is described
Between ice machine and the evaporative condenser.
3. the CO suitable for extremely cold area according to claim 22The heat pump of overlapping, it is characterised in that
The carbon dioxide heat-pump cooling cycle system includes the outdoor heat exchanger, internal exchanger, the first compressor and the
One expansion valve；
The outdoor heat exchanger is respectively arranged with air inlet, gas outlet, first, second mouthful, the 3rd mouthful and the 4th mouthful, described
Connected with the first port of the internal exchanger by first expansion valve flatly, the second port of the internal exchanger
First interface with the evaporative condenser is connected；Described second mouthful, the 3rd port of the internal exchanger, the inside
4th port of heat exchanger and first compressor are sequentially communicated, and the compressor connects with the second of the evaporative condenser
Mouth is connected；
Described 3rd mouthful and described 4th mouthful connects two connecting pipelines respectively.
4. the CO suitable for extremely cold area according to claim 32The heat pump of overlapping, it is characterised in that
The first fluid reservoir is provided between the cold and hot water- to-water heat exchanger and second expansion valve.
5. the CO suitable for extremely cold area according to claim 42The heat pump of overlapping, it is characterised in that
Unidirectional valve group, and the unidirectional valve group and described are provided between the cold and hot water- to-water heat exchanger and first fluid reservoir
Two expansion valves are connected.
6. the CO suitable for extremely cold area according to claim 52The heat pump of overlapping, it is characterised in that
The second fluid reservoir is provided between second compressor and the second control valve of the 4th interface.
7. the CO suitable for extremely cold area according to claim 32The heat pump of overlapping, it is characterised in that
The outdoor heat exchanger, the internal exchanger and the cold and hot water- to-water heat exchanger are respectively finned heat exchanger.
8. the CO suitable for extremely cold area according to claim 22The heat pump of overlapping, it is characterised in that
The first control valve and the second control valve are respectively magnetic valve.
9. the CO suitable for extremely cold area according to claim 12The heat pump of overlapping, it is characterised in that
The reversal valve is four-way reversing valve.
10. a kind of CO suitable for extremely cold area2The control method of the heat pump of overlapping, it is characterised in that including：
Step S1, closes first and controls valve, opens second and controls valve；
Step S2, low-temperature zone refrigerant carbon dioxide enters outdoor heat exchanger and absorbs outdoor heat by the first expansion valve；
Step S3, by entering the first compressor after internal exchanger, through the first compressor compresses；
Step S4, into evaporative condenser heat release after return to the first expansion valve complete low-temperature zone circulation；
Step S5, the refrigerant working medium of high temperature section is once exchanged heat absorption heat through the second expansion valve into ice machine；
Step S6, absorbing low-temperature zone heat into evaporative condenser carries out secondary heat exchange；
Step S7, by entering hot and cold water heat exchanger heat release after four-way reversing valve, the second compressor compresses；
Step S8, returns to the second expansion valve and completes high temperature section circulation through unidirectional valve group, the first fluid reservoir.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111795423A (en) * | 2020-03-26 | 2020-10-20 | 同济大学 | Carbon dioxide heat pump heating system based on three-fluid heat exchanger |
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