CN106440441A - Transcritical CO2 compound heat pump and control method thereof - Google Patents

Transcritical CO2 compound heat pump and control method thereof Download PDF

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Publication number
CN106440441A
CN106440441A CN201610859765.XA CN201610859765A CN106440441A CN 106440441 A CN106440441 A CN 106440441A CN 201610859765 A CN201610859765 A CN 201610859765A CN 106440441 A CN106440441 A CN 106440441A
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China
Prior art keywords
recombiner
air cooling
main road
compressor
state point
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CN201610859765.XA
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Chinese (zh)
Inventor
曹锋
崔靖
宋昱龙
李东哲
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Xian Jiaotong University
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Xian Jiaotong University
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Priority to CN201610859765.XA priority Critical patent/CN106440441A/en
Publication of CN106440441A publication Critical patent/CN106440441A/en
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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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
    • 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
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

The invention discloses a transcritical CO2 compound heat pump and a control method thereof. The transcritical CO2 compound heat pump comprises a CO2 main path compressor, an air cooling-air cooling recombiner, a supercooling-evaporation recombiner, an evaporator and a CO2 auxiliary compressor, wherein the air cooling-air cooling recombiner comprises a CO2 main path, a CO2 auxiliary path and a water path; and the supercooling-evaporation recombiner comprises a CO2 main path supercooling section and a CO2 auxiliary evaporation section. According to the invention, the transcritical CO2 compound heat pump comprises two working modes according to the return water temperature, the application range of a unit is wider, and daily requirements are met; the transcritical CO2 compound heat pump only has one refrigerant and water heat exchanger, and compared with a conventional transcritical CO2 compound heat pump with three water and refrigerant heat exchangers, the transcritical CO2 compound heat pump has the advantages that a circulating water path is a single loop with one inlet and one outlet, the system is simple, and the failure rate is decreased; and an auxiliary loop adopts an inverter compressor, a heat pump water heater system can stably and reliably operate for a long time under the conditions of wider load and temperature, the power consumption is reduced, and the starting current of the compressor can be decreased.

Description

A kind of Trans-critical cycle CO2Combined heat-pump and its control method
Technical field
The invention belongs to technical field of heat pumps, more particularly to a kind of Trans-critical cycle CO2Combined heat-pump and its control method.
Background technology
Heat pump can absorb the heat in surrounding air, by working medium circulation, transfer heat to recirculated water, play heating Effect.Traditional heat pump is used mostly the tradition working medium such as R134a, R410a, and the feature of environmental protection is poor, faces the trend that gradually eliminates.
Front International Institute or Refrigeration chairman G Lorentzen proposes CO2Trans critical cycle theory, it is indicated which is in art of heat pumps Will be with extremely vast potential for future development.CO2Critical temperature very low, be 31.1 DEG C, therefore CO2Heat pump is typically using across facing Boundary is circulated.CO2Trans critical cycle compressor exhaust temperature higher (up to more than 100 DEG C), and in Trans-critical cycle area, CO2In cooling During there is larger temperature glide, this temperature glide is just matched with required temperature-variable heat source, can by water once It is heated to very high temperature and high efficiency is kept, is particularly suitable for domestic domestic hot-water field.
CO2Difference between trans critical cycle system and traditional subcritical cycle system is：In traditional subcritical system In system, cold-producing medium within the condenser in most of region temperature keep constant, and in CO2In trans critical cycle system, supercritical Two-phase section presence is had no in pressure area, temperature and pressure is separate variable, high side pressure changes to refrigerating capacity, compression Machine power consumption and COP value can also produce impact.
Trans-critical cycle CO2Heat pump cycle has unique advantage, and its exothermic process temperature is higher and presence one is sizable Temperature glide (about 80～100 DEG C).Research shows：(1) when evaporating temperature is 0 DEG C, water temperature can be heated to 60 DEG C from 0 DEG C, Its heat pump COP can reach 4.3, reduce on 75% than electric heater and gas heater energy consumption.In cold district, conventional air source The heating capacity of heat pump and efficiency decline quickly with the reduction of ambient temperature, and the use of heat pump is restricted.And CO2Heat pump exists Higher heating load and very high leaving water temperature can be maintained under low temperature environment, greatly save the energy spent by ancillary heating equipment Amount.
The performance of trans-critical carbon dioxide heat pump water heater is seriously limited by gas cooler exit temperature, gas cooler Outlet temperature is lower, and systematic function is better.When the return water temperature in water circulation system sufficiently low (20 DEG C even below 20 DEG C), The gas cooler exit temperature of trans-critical carbon dioxide heat pump water heater also can by circulating water at a fairly low temperature, This when system excellent performance.But (in view of heat transfer temperature difference, gas cooler is exported when return water temperature is higher than 25 DEG C Carbon dioxide temperature is likely to be breached 30 DEG C), the performance of system acutely can decline with the rising of return water temperature, when return water temperature height The performance extreme difference of carbon dioxide heat pump system when 40 DEG C, heats COP even below 1.5.
Existing Trans-critical cycle CO2Combined heat-pump backwater is divided into two-way, and first via backwater enters the gas cooler of assist circulation, Outlet is then return to, the backwater of the second road ring enters auxiliary and vaporizer is followed, the water after cooling enters the gas cooler of major cycle, It is then return to outlet.First via water outlet mix with the second tunnel water outlet after together with supply water to user.Existing Trans-critical cycle CO2Compound Heat pump needs the heat exchanger of three cold-producing mediums and water, and water route is distributed understands extremely complex with being connected, and easily breaks down.
Existing determine frequency heat pump and adopt invariable frequency compressor, loop flow can not change, compound especially for major-minor level The heat pump product of type, fixing compressor flowrate causes the energy under off-design behaviour than being difficult in adapt to changeable operating condition Waste or performance reduces.
Content of the invention
Object of the present invention is to provide a kind of Trans-critical cycle CO2Combined heat-pump and its control method, with solve existing across Critical CO2Combined heat-pump performance is seriously limited by gas cooler exit temperature, water route distribution and is connected complicated and energy waste Problem.Heat pump of the present invention is divided into major loop and subsidiary loop；Under general operating mode, (30 DEG C or low when return water temperature is relatively low In 30 DEG C), run direct-heating-type heating mode；When return water temperature is higher (higher than 30 DEG C), circular type's heating mode is converted to.
In order to realize above-mentioned purpose, the technical solution used in the present invention is：
A kind of Trans-critical cycle CO2Combined heat-pump, including CO2Main road compressor, air cooling-air cooling recombiner, supercool-evaporation are compound Device, vaporizer and CO2Auxiliary compressor；Air cooling-air cooling recombiner includes CO2Main road, CO2Bypass and three, water route path；Cross Cold-evaporation recombiner includes CO2Main road super cooled sect and CO2Bypass evaporator section two paths；A kind of Trans-critical cycle CO2Compound thermal Pump is comprising major loop and two loops of subsidiary loop；Major loop：CO2The outlet connection air cooling-air cooling recombiner of main road compressor CO2The import of main road, the CO of air cooling-air cooling recombiner2The outlet of main road connects the CO of supercool-evaporation recombiner2Main road is supercool Section import, the CO of supercool-evaporation recombiner2The import of the outlet connection vaporizer of main road super cooled sect, the outlet connection of vaporizer CO2The import of main road compressor；Subsidiary loop：CO2The CO of the outlet connection air cooling-air cooling recombiner of auxiliary compressor2Bypass Import, air cooling-air cooling recombiner CO2The outlet of bypass connects the CO of supercool-evaporation recombiner2The import of bypass evaporator section, mistake The CO of cold-evaporation recombiner2The outlet connection CO of bypass evaporator section2The import of auxiliary compressor；Supercool on major loop-evaporation is multiple CO is provided between clutch and vaporizer2Main road expansion valve；On subsidiary loop, air cooling-air cooling recombiner and supercool-evaporation are compound CO is provided between device2Auxiliary expansion valve.
Further, on vaporizer, fan is also equipped with.
Further, CO2Auxiliary compressor adopts frequency-changeable compressor.
Further, air cooling-air cooling recombiner includes three inner tubes and an outer tube, and two interior pipelines are used as CO2Lead back Road, an interior pipeline is used as CO2Bypass, the path between outer tube and three inner tubes is water route.
Further, in water route, recirculated water is passed through.
Further, a kind of Trans-critical cycle CO2Combined heat-pump includes two kinds of mode of operations：
During direct-heating-type heating mode, CO2Main circuit compressor is opened, and major loop is opened；CO2Auxiliary compressor cuts out, auxiliary Loop is closed；Fan is opened；
During circular type's heating mode, CO2Main circuit compressor is opened, and major loop is opened；CO2Auxiliary compressor is opened, auxiliary Loop is opened；Fan is opened.
A kind of Trans-critical cycle CO2The control method of combined heat-pump, when return water temperature is equal to or less than design temperature, control is across facing Boundary CO2Combined heat-pump is in direct-heating-type heating mode, and return water temperature is higher than control Trans-critical cycle CO during design temperature2At combined heat-pump In circular type's heating mode；
Direct-heating-type heating mode：CO2Main circuit compressor works, and major loop is opened；CO2Auxiliary compressor cuts out, and aids in back Road is closed；In major loop, CO2Working medium is by state point a through CO2Reach state point b after the compression of main road compressor, enter air cooling- The CO of air cooling recombiner2In main road, the recirculated water in water route is heated, and state point c itself is cooled to, then flow through The CO of supercool-evaporation recombiner2Main road super cooled sect state does not change, and is still state point c, subsequently into CO2Main road expansion valve enters Row expansion, the low pressure working fluid after expansion reaches state point d, enters into vaporizer and be evaporated, and absorbs heat, returns to state point a, Eventually pass back to CO2The import of main road compressor；
Circular type's heating mode：CO2Main circuit compressor works, and major loop is opened, CO2Auxiliary compressor works, and aids in back Road is opened；Major loop：CO2Working medium is by state point a through CO2State point b is reached after the compression of main road compressor, enters air cooling-gas The CO of cold recombiner2In main road, the recirculated water in water route is heated, and itself cooling reaches state point c, then flows through The CO of supercool-evaporation recombiner2Main road super cooled sect and CO2Bypass evaporator section carries out heat exchange, cools further, reaches state Point d, subsequently into CO2Main road expansion valve is expanded, and the low pressure working fluid after expansion reaches state point e, is entered into vaporizer and is entered Row evaporation, absorbs heat, returns to state point a, eventually pass back to CO2The import of main road compressor；Subsidiary loop：CO2Working medium is by state Point f is through CO2State point g is reached after the compression of auxiliary compressor, enters the CO of air cooling-air cooling recombiner2In bypass, to water route In recirculated water heated, and itself cool and reach state point h, subsequently enter CO2Bypass expansion valve is expanded State point i is reached, the low pressure working fluid after expansion enters the CO of supercool-evaporation recombiner2Bypass evaporator section, with CO2Main road super cooled sect Heat exchange, cools down CO further2Main road super cooled sect, itself evaporation endothermic reaches state point f, eventually passes back to CO2The entering of auxiliary compressor Mouthful.
Further, the design temperature is 30 DEG C.
Compared with prior art, the present invention has following beneficial effect：
When return water temperature is higher (higher than 30 DEG C), operation circular type's heating mode, main road compressor operating, major loop is beaten Open, auxiliary route compressor operating, subsidiary loop is opened, fan is in opening；First supercool-evaporation in subsidiary loop is multiple In clutch, the CO of subsidiary loop2Evaporation endothermic, to the CO in major loop2Second cooling is carried out, makes the CO in major loop2Reach Suitable outlet temperature, it is ensured that higher systematic function.
Further, in the present invention only one of which cold-producing medium and water heat exchanger, that is, air cooling-air cooling recombiner.Phase The existing Trans-critical cycle CO of comparison2The heat exchanger of three water and cold-producing medium in combined heat-pump, this circulation waterway is one-in-and-one-out Single loop, simple system, reduce fault rate.
Further, according to the difference of return water temperature in practice, by controlling two compressors, carry out direct-heating-type and heat mould Formula and the conversion of circular type's heating mode, make that the range of application of source pump is wider, and performance is higher.
Further, CO2Belong to noble gases, nontoxic non-stimulated；Good safety and chemical stability, safety is no Poison, non-combustible, even if not decomposing generation harmful gass at high temperature yet；Which is 1, CO to global warming potential index GWP2It is not required to Want commercial synthesis, it is only necessary to which extraction is just permissible in an atmosphere, easy to use；Meanwhile, it makees to atmospheric ozone layer no any broken ring With ODP is 0.Also, CO2Superior thermophysical property itself and good migration characteristic also are adapted for which as refrigeration working medium.
Further, the present invention heats mode and adopts CO2Heat pump pattern, energy utilization rate is higher, more energy-conservation.CO2Evaporation Latent heat is larger, refrigerating effect per unit swept volume height, with excellent flowing and heat-transfer character, is significantly reduced the size of system, makes whole Individual system is closely.
Further, Trans-critical cycle CO2Heat pump cycle has unique advantage, and its exothermic process temperature is higher and has one Sizable temperature glide (about 80～100 DEG C).Its heat pump COP can reach 4.3, drop than electric heater and gas heater energy consumption Low by more than 75%.In cold district, the heating capacity of conventional air source heat pump and efficiency decline quickly with the reduction of ambient temperature, heat The use of pump is restricted.And CO2Heat pump can maintain higher heating load at low ambient temperatures, greatly save auxiliary heating Energy spent by equipment.
Further, subsidiary loop can enable heat pump water heater system in wider load and temperature using frequency-changeable compressor Long-time stable reliability service under the conditions of degree, reduces power consumption, can also reduce the starting current of compressor.
Description of the drawings
Fig. 1 is a kind of Trans-critical cycle CO of the present invention2The structural representation of combined heat-pump unit；
Fig. 2 is a kind of Trans-critical cycle CO of the present invention2Structural representation under combined heat-pump unit direct-heating-type heating mode；
Fig. 3 is a kind of Trans-critical cycle CO of the present invention2Circulation schematic diagram under combined heat-pump unit direct-heating-type heating mode；
Fig. 4 is a kind of Trans-critical cycle CO of the present invention2Structural representation under combined heat-pump unit circular type's heating mode；
Fig. 5 is a kind of Trans-critical cycle CO of the present invention2Circulation schematic diagram under combined heat-pump unit circular type's heating mode；
Fig. 6 is a kind of Trans-critical cycle CO of the present invention2The internal duct arrangement of combined heat-pump unit air cooling-air cooling recombiner is illustrated Figure；
Wherein：1、CO2Main road compressor；2nd, air cooling-air cooling recombiner；3rd, supercool-evaporation recombiner；4、CO2Main road expands Valve；5th, vaporizer；6、CO2Auxiliary compressor；7、CO2Auxiliary expansion valve；8th, fan；9、CO2Main road；10、CO2Bypass；11st, water Road；12、CO2Main road super cooled sect；13、CO2Bypass evaporator section；
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described in further detail.
Fig. 1 is referred to, a kind of Trans-critical cycle CO of the present invention2Combined heat-pump, including CO2Main road compressor 1, include CO2Main road 9, CO2Air cooling-air cooling the recombiner 2 of 11 3 paths of bypass 10 and water route, include CO2Main road super cooled sect 12 and CO2Bypass evaporator section Supercool-evaporation the recombiner 3 of 13 two paths, vaporizer 5, CO2Auxiliary compressor 6；
A kind of Trans-critical cycle CO of the present invention2Combined heat-pump is comprising major loop and two loops of subsidiary loop；
Major loop：CO2The CO of the outlet connection air cooling-air cooling recombiner 2 of main road compressor 12The import of main road 9, air cooling- The CO of air cooling recombiner 22The outlet of main road 9 connects the CO of supercool-evaporation recombiner 3212 import of main road super cooled sect, supercool-evaporation The CO of recombiner 32The import of the outlet connection vaporizer 5 of main road super cooled sect 12, the outlet connection CO of vaporizer 52Main road compressor 1 import；
Subsidiary loop：CO2The CO of the outlet connection air cooling-air cooling recombiner 2 of auxiliary compressor 62The import of bypass 10, gas The CO of cold-air cooling recombiner 22The outlet of bypass 10 connects the CO of supercool-evaporation recombiner 32The import of bypass evaporator section 13, mistake The CO of cold-evaporation recombiner 32The outlet connection CO of bypass evaporator section 132The import of auxiliary compressor 6.
Supercool on major loop-between evaporation recombiner 3 and vaporizer 5, to be provided with CO2Main road expansion valve 4；On subsidiary loop CO is provided between air cooling-air cooling recombiner 2 and supercool-evaporation recombiner 32Auxiliary expansion valve 7.
Fan 8 is also equipped with vaporizer 5, by changing the rotating speed of fan, can adjust the suitable coefficient of heat transfer.
CO2Auxiliary compressor 6 adopts frequency-changeable compressor.
Refer to shown in Fig. 6, air cooling-air cooling recombiner 2 includes three inner tubes and an outer tube, two interior pipeline conducts CO2Major loop 9, an interior pipeline is used as CO2Bypass 10, the path between outer tube and three inner tubes is water route 11.
In order to ensure that unit, when return water temperature changes, can guarantee that suitable CO2Chilling temperature, higher so as to ensure Systematic function, the present invention is provided with two kinds of operational modes：
Direct-heating-type heating mode (return water temperature is 30 DEG C or is less than 30 DEG C)：Refer to Fig. 2 and Fig. 3, CO2Major loop pressure Contracting machine 1 works, and major loop is opened；CO2Auxiliary compressor 6 cuts out, and subsidiary loop is closed；Fan is in opening.Major loop： CO2Working medium is by state point a through CO2State point b is reached after the compression of main road compressor 1, enters air cooling-air cooling recombiner 2 CO2In main road 9, the recirculated water in water route 11 is heated, and itself be cooled to suitable temperature and state point c is reached, so The CO of supercool-evaporation recombiner 3 is flowed through afterwards212 state of main road super cooled sect does not change, and is still state point c, subsequently into CO2Main Road expansion valve 4 is expanded, and the low pressure working fluid after expansion reaches state point d, is entered into vaporizer 5 and is evaporated, and absorbs heat, State point a is returned to, eventually passes back to CO2The import of main road compressor 1.
Circular type's heating mode (return water temperature is higher than 30 DEG C)：Refer to Fig. 4 and Fig. 5, CO2Main circuit compressor 1 works, Major loop is opened, CO2Auxiliary compressor 6 works, and subsidiary loop is opened；Fan is in opening.Major loop：CO2Working medium is by shape State point a is through CO2State point b is reached after the compression of main road compressor 1, enters the CO of air cooling-air cooling recombiner 22In main road 9, right Recirculated water in water route 11 is heated, and itself is cooled to suitable temperature and is reached state point c, then flow through supercool-steam Send out the CO of recombiner 32Main road super cooled sect 12, with CO2Bypass evaporator section carries out heat exchange, cools further, reaches state point d, Subsequently into CO2Main road expansion valve 4 is expanded, and the low pressure working fluid after expansion reaches state point e, and entering into vaporizer 5 is carried out Evaporation, absorbs heat, returns to state point a, eventually pass back to CO2The import of main road compressor 1.
Subsidiary loop：CO2Working medium is by state point f through CO2State point g is reached after the compression of auxiliary compressor 6, enters gas The CO of cold-air cooling recombiner 22In bypass 10, the recirculated water in water route 11 is heated, and itself cool and reach shape State point h, subsequently enters CO2Bypass expansion valve 7 carries out expansion and reaches state point i, and the low pressure working fluid after expansion enters supercool-evaporation The CO of recombiner 32Bypass evaporator section 13, with CO212 heat exchange of main road super cooled sect, cools down CO further2Main road super cooled sect 12, itself Evaporation endothermic reaches state point f, eventually passes back to CO2The import of auxiliary compressor 6.
In air cooling-air cooling recombiner 2, main road CO2Working medium is in CO2Heat release, bypass CO is cooled down in main road 92Working medium is in CO2 Heat release is cooled down in bypass 10, and recirculated water absorbs heat, reaches suitable temperature.In supercool-evaporation recombiner 3, main road CO2Work Matter is in CO2Main road super cooled sect 12 cools down heat release further, reaches suitable temperature, bypass CO2Working medium is in CO2Bypass evaporator section 13 steams Send out heat absorption, CO2Bypass evaporator section 13 and CO212 heat exchange of main road super cooled sect, keeps heat balance.

Claims (8)

1. a kind of Trans-critical cycle CO2Combined heat-pump, it is characterised in that including CO2Main road compressor (1), air cooling-air cooling recombiner (2), supercool-evaporation recombiner (3), vaporizer (5) and CO2Auxiliary compressor (6)；Air cooling-air cooling recombiner (2) includes CO2Main Road (9), CO2Bypass (10) and (11) three, water route path；Supercool-evaporation recombiner (3) includes CO2Main road super cooled sect (12) and CO2Bypass evaporator section (13) two paths；
A kind of Trans-critical cycle CO2Combined heat-pump is comprising major loop and two loops of subsidiary loop；
Major loop：CO2The CO of the outlet connection air cooling-air cooling recombiner (2) of main road compressor (1)2The import of main road (9), gas The CO of cold-air cooling recombiner (2)2The outlet of main road (9) connects the CO of supercool-evaporation recombiner (3)2Main road super cooled sect (12) enters Mouthful, the CO of supercool-evaporation recombiner (3)2The import of outlet connection vaporizer (5) of main road super cooled sect (12), vaporizer (5) Outlet connection CO2The import of main road compressor (1)；
Subsidiary loop：CO2The CO of the outlet connection air cooling-air cooling recombiner (2) of auxiliary compressor (6)2The import of bypass (10), Air cooling-air cooling recombiner (2) CO2The outlet of bypass (10) connects the CO of supercool-evaporation recombiner (3)2Bypass evaporator section (13) Import, the CO of supercool-evaporation recombiner (3)2The outlet connection CO of bypass evaporator section (13)2The import of auxiliary compressor (6)；
Supercool on major loop-between evaporation recombiner (3) and vaporizer (5), to be provided with CO2Main road expansion valve (4)；On subsidiary loop CO is provided between air cooling-air cooling recombiner (2) and supercool-evaporation recombiner (3)2Auxiliary expansion valve (7).
2. a kind of Trans-critical cycle CO according to claim 12Combined heat-pump, it is characterised in that vaporizer is also equipped with (5) Fan (8).
3. a kind of Trans-critical cycle CO according to claim 12Combined heat-pump, it is characterised in that CO2Auxiliary compressor (6) is adopted Frequency-changeable compressor.
4. a kind of Trans-critical cycle CO according to claim 12Combined heat-pump, it is characterised in that air cooling-air cooling recombiner (2) bag Three inner tubes and an outer tube is included, two interior pipelines are used as CO2Major loop (9), an interior pipeline is used as CO2Bypass (10), outer tube And the path between three inner tubes is water route (11).
5. a kind of Trans-critical cycle CO according to claim 12Combined heat-pump, it is characterised in that water route is passed through circulation in (11) Water.
6. a kind of Trans-critical cycle CO according to claim 22A kind of combined heat-pump, it is characterised in that Trans-critical cycle CO2Multiple Closing heat pump includes two kinds of mode of operations：
During direct-heating-type heating mode, CO2Main circuit compressor (1) is opened, and major loop is opened；CO2Auxiliary compressor (6) cuts out, auxiliary Loop is helped to close；Fan (8) is opened；
During circular type's heating mode, CO2Main circuit compressor (1) is opened, and major loop is opened；CO2Auxiliary compressor (6) is opened, auxiliary Loop is helped to open；Fan (8) is opened.
7. a kind of Trans-critical cycle CO2The control method of combined heat-pump, it is characterised in that based on any one of claim 1 to 6 A kind of Trans-critical cycle CO2Combined heat-pump, it is characterised in that return water temperature is less than or equal to control Trans-critical cycle CO during design temperature2Multiple Close heat pump and direct-heating-type heating mode is in, return water temperature is higher than control Trans-critical cycle CO during design temperature2Combined heat-pump is in circulation Type heating mode；
Direct-heating-type heating mode：CO2Main circuit compressor (1) works, and major loop is opened；CO2Auxiliary compressor (6) cuts out, auxiliary Loop is closed；In major loop, CO2Working medium is by state point a through CO2State point b is reached after the compression of main road compressor (1), is entered The CO of air cooling-air cooling recombiner (2)2In main road (9), the recirculated water in water route (11) is heated, and itself is cooled to State point c, then flows through the CO of supercool-evaporation recombiner (3)2Main road super cooled sect (12) state does not change, and is still state point C, subsequently into CO2Main road expansion valve (4) is expanded, and the low pressure working fluid after expansion reaches state point d, enters into vaporizer (5) it is evaporated, heat is absorbed, state point a is returned to, eventually passes back to CO2The import of main road compressor (1)；
Circular type's heating mode：CO2Main circuit compressor (1) works, and major loop is opened, CO2Auxiliary compressor (6) works, auxiliary Loop is opened；Major loop：CO2Working medium is by state point a through CO2State point b is reached after the compression of main road compressor (1), enters gas The CO of cold-air cooling recombiner (2)2In main road (9), the recirculated water in water route (11) is heated, and itself cooling reaches State point c, then flows through the CO of supercool-evaporation recombiner (3)2Main road super cooled sect (12) and CO2Bypass evaporator section carries out heat exchange, Cool further, state point d is reached, subsequently into CO2Main road expansion valve (4) is expanded, the low pressure working fluid after expansion State point e is reached, is entered into vaporizer (5) and be evaporated, heat is absorbed, state point a is returned to, eventually passes back to CO2Main road compresses The import of machine (1)；Subsidiary loop：CO2Working medium is by state point f through CO2State point g is reached after the compression of auxiliary compressor (6), Enter the CO of air cooling-air cooling recombiner (2)2In bypass (10), the recirculated water in water route (11) is heated, and from coldness of the body But cooling reaches state point h, subsequently enters CO2Bypass expansion valve (7) carries out expansion and reaches state point i, the low pressure work after expansion Matter enters the CO of supercool-evaporation recombiner (3)2Bypass evaporator section (13), with CO2Main road super cooled sect (12) heat exchange, is cooled down further CO2Main road super cooled sect (12), itself evaporation endothermic reaches state point f, eventually passes back to CO2The import of auxiliary compressor (6).
8. control method according to claim 7, it is characterised in that design temperature be.
CN201610859765.XA 2016-09-28 2016-09-28 Transcritical CO2 compound heat pump and control method thereof Pending CN106440441A (en)

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CN109186115A (en) * 2018-07-19 2019-01-11 西安交通大学 A kind of Trans-critical cycle CO2Parallelly compressed system and its capacity ratio method
CN109747384A (en) * 2019-02-19 2019-05-14 上海交通大学 Parallelly compressed formula CO with regenerative apparatus2Automobile heat pump air-conditioning system
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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CN108253650A (en) * 2018-01-18 2018-07-06 西安交通大学 A kind of control method of critical-cross carbon dioxide combined heat-pump system
CN108253650B (en) * 2018-01-18 2019-04-12 西安交通大学 A kind of control method of critical-cross carbon dioxide combined heat-pump system
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CN109163917A (en) * 2018-07-19 2019-01-08 西安交通大学 A kind of Trans-critical cycle CO2Heat pump accelerated life test system and method
CN109186115A (en) * 2018-07-19 2019-01-11 西安交通大学 A kind of Trans-critical cycle CO2Parallelly compressed system and its capacity ratio method
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CN109747384A (en) * 2019-02-19 2019-05-14 上海交通大学 Parallelly compressed formula CO with regenerative apparatus2Automobile heat pump air-conditioning system
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CN114945780A (en) * 2020-01-15 2022-08-26 三菱电机株式会社 Heat pump device
CN114945780B (en) * 2020-01-15 2024-04-12 三菱电机株式会社 Heat pump device
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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Application publication date: 20170222