CN107144040A - Multi-stage compression double parallel piston type carbon dioxide heat pump system - Google Patents
Multi-stage compression double parallel piston type carbon dioxide heat pump system Download PDFInfo
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- CN107144040A CN107144040A CN201710385497.7A CN201710385497A CN107144040A CN 107144040 A CN107144040 A CN 107144040A CN 201710385497 A CN201710385497 A CN 201710385497A CN 107144040 A CN107144040 A CN 107144040A
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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
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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
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
-
- 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
-
- 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/06—Several compression cycles arranged in parallel
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
- F25B2400/072—Intercoolers therefor
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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
- F25B2500/00—Problems to be solved
- F25B2500/12—Sound
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
The present invention relates to big thermoelecrtic technical field, disclose a kind of multi-stage compression double parallel piston type carbon dioxide heat pump system, evaporator outlet connects low-pressure stage compression unit, low-pressure stage compression unit is by identical first compressor, the second compressor parallel is opposed constitutes, low-pressure stage compression unit connects the entrance of the 3rd compressor by first order air cooler, the outlet of 3rd compressor connects the entrance of expanding machine by second level air cooler, and expander outlet connects the entrance of evaporator by auxiliary throttle valve；First compressor, the second compressor, the 3rd compressor are coaxial, and the 3rd compressor is coaxially opposed with expanding machine as hiigh pressure stage compression unit, recovery section expansion work.The present invention is by the way that multi-stage compression, low-pressure stage compression unit duplex cylinder compressor be opposed, hiigh pressure stage compression unit is opposed with expanding machine, noise is reduced, compressor efficiency is lifted, reaches the effect of energy-saving and emission-reduction, the power of heat pump is substantially improved using Large Piston, the heating equipments such as boiler can be replaced.
Description
Technical field
The present invention relates to big thermoelecrtic technical field, in particular, it is related to a kind of applied to large-scale heating engineering
Using carbon dioxide as the heat pump circulating system of working medium.
Background technology
Beijing-tianjin-hebei Region atmosphere polluting problem is protruded relatively, and excellent number of days ratio in 2016 is 56.8%, average than the whole nation
Ratio is low 22 percentage points；It is 9.2% that severe and the above, which pollute number of days ratio, is 3.5 times of average national level；December is sent out
Raw 5 a wide range of heavily contaminated synoptic processes.On on November 15th, 2016 to December 31, Beijing Tianjin and Hebei Region PM2.5 concentration is
135ug/m3, is 2.4 times of non-heating period concentration, the period accounts for the 12.8% of annual time, and annual PM2.5 contributions are reached
24.4%.Current study show that, the burning of coal inefficient dispersal is the one of the main reasons of China's haze formation.Thoroughly controlled to realize
Haze and target for energy-saving and emission-reduction are managed, Jing-jin-ji region has started " no coalification " action.
Heat pump is the mining machines of regenerative resource, and it exploits the regenerative resource of several times with a electric energy or mechanical energy,
It is important power-saving technology and green technology.Heat pump manufacturing industry is greatly developed, heat pump techniques are widelyd popularize, it is real to carry out coal to change electricity
The now important measures without coalification.
Carbon dioxide can trace back to early 20th century as heat pump fluid.Carbon dioxide is nontoxic, safer, so once existing
Also continue in cold storage plant peculiar to vessel and apply 50 years as long as.Because the Ozone depletion index of carbon dioxide is 0, global warming is dived
Energy value (GWP) is only 1.It can reduce environmental pollution as heat pump working medium.And carbon dioxide working medium is many energy
The byproduct of quantitative response, is easily produced.Carbon dioxide working medium does not decompose generation toxic gas at high temperature, have good security and
Chemical stability.
The refrigerating effect per unit swept volume of carbon dioxide is high, and has good mobility, can reduce the size of compressor and system,
Heating system can be simplified.Carbon dioxide has higher thermal conductivity, improves the heat exchange property of heat pump.Carbon dioxide heat-pump system
The pressure of system is 7-8 times of common heat pump, and wherein expansion valve pressure difference is big, and caused restriction loss is larger.
Realize that coal changes the purpose of electricity it is necessary to lifting the thermic load of heat pump using carbon dioxide heat-pump technology to reach.
For the refrigeration unit compared with High cooling power, separate unit High cooling power compressor set, unit load has certain limitation, refrigeration (heating) amount
It is smaller, it is difficult to reach demand；For High cooling power (heat) unit, many producers are in no-man's-land in this interval, then
Generate multi-machine heads unit.Multi-machine heads unit is assembled using multiple compressor sets, and it occurs being not because system
Superiority, but caving-in bash of the producer to the market demand.The running gear of unit is more, and the reliability of continuation is poorer.Multimachine
Multiple compressors are configured in the unit of head, a set of controller will control multiple control elements, and system complex, equipment is various, unit
Reliability it is relative low, service life is relatively short, and its refrigerating capacity (heating capacity) still has certain limitations.
Lubricating oil is the lubricant of heat pump type air conditioning system, play reduction mechanical part abrasion, reducing mechanism friction temperature and
Strengthen the effect such as sealing.When refrigeration unit is operated, understand some lubricating oil and inevitably enter with refrigerant gas
Whole refrigeration system, participates in kind of refrigeration cycle.Lubricating oil enters after evaporator or condenser with refrigerant can be in its coil pipe inner surface
One layer of oil film is formed, because this layer of oil film thermal conductivity factor is smaller, this directly results in the increase of heat exchanger heat transfer thermal resistance, and influence is changed
Hot property, reduces heat exchange efficiency, increases running resistance.Research shows, in the evaporator of refrigeration system, when lubrication oil circulation amount
During more than 3%, exchange capability of heat will deteriorate, and the pressure loss will increase；When the lubrication oil circulation amount in evaporator reaches 5%
When, the decay of refrigerating capacity will reach more than 10%, increase power consumption, greatly reduce the refrigerating capacity of system.
The compressor constructed with multi-stage compression cooling during rolling, is generally all to connect difference cylinder by mechanism.In motor
During driving, inertia force and moment of inertia in mechanism will cause the vibration of mechanism, particularly in the mechanical device run at high speed
This vibration effect is especially serious, can cause mechanism vibrations, produces the influence such as noise, hinders mechanism and sent out to high-precision direction
Exhibition.
The content of the invention
The present invention is to solve existing heat pump heating engineering power is relatively low, it is difficult to which the technology for meeting big workload demand is asked
Topic passes through multi-stage compression, low-pressure stage compression unit there is provided a kind of multi-stage compression double parallel piston type carbon dioxide heat pump system
Duplex cylinder compressor is opposed, hiigh pressure stage compression unit is opposed with expanding machine, and the power of heat pump is on the one hand substantially improved, and can replace
On the other hand the heating equipments such as boiler, power reduce noise up to 1000KW, lifts compressor efficiency, reaches energy-saving and emission-reduction
Effect；Delivery temperature is reduced simultaneously and hot water is produced, and reduces power consumption.
In order to solve the above-mentioned technical problem, the present invention is achieved by following technical scheme：
A kind of multi-stage compression double parallel piston type carbon dioxide heat pump system, the system includes evaporator (1), described to steam
The entrance of the outlet connection low-pressure stage compression unit of device (1) is sent out, the low-pressure stage compression unit is compressed by identical first
Machine (2), the second compressor (3) opposed composition in parallel, the outlet connection first order air cooler (4) of the low-pressure stage compression unit
Entrance, the outlet of the first order air cooler (4) connects the entrance of the 3rd compressor (6), the outlet of the 3rd compressor (6)
The entrance of second level air cooler (7) is connected, the entrance of the outlet connection expanding machine (9) of the second level air cooler (7) is described swollen
The entrance of the outlet connection auxiliary throttle valve (10) of swollen machine (9), the outlet of the auxiliary throttle valve (10) connects the evaporator
(1) entrance.
First compressor (2), second compressor (3), the 3rd compressor (6) are connected by same main shaft
It is connected to motor (11) and is driven by motor (11), the 3rd compressor (6) is as hiigh pressure stage compression unit, with the expanding machine
(9) coaxial opposed, expanding machine 9 is also connected to the main shaft, drives the 3rd compressor (6) to reclaim expansion work.
First compressor (2), second compressor (3), the 3rd compressor (6) are piston type and adopted
With Large Piston, the expanding machine (9) is also piston type.
The first order air cooler (4) is arranged in the first water tank (5), and the second level air cooler (7) is arranged on second
In water tank (8).
The beneficial effects of the invention are as follows：
The multi-stage compression double parallel piston type carbon dioxide heat pump system of the present invention, applied to big thermoelecrtic engineering, machine
Group power is up to 1000KW.Heat pump is using carbon dioxide as working medium, using the intercooled mode of multi-stage compression, lifts unit
Power, reduces delivery temperature, and utilized liberated heat during cooling during rolling by gas cooler.
Wherein include two compressor parallels in low-pressure stage compression unit opposed, reach the balance on mechanics, mitigate connection
The influence of inertia force of mechanism and a moment of inertia, reaches the effect abated the noise；The compressor of hiigh pressure stage compression unit
It is coaxially disposed with expanding machine, the mechanical work driving high pressure stage compressor of expanding machine output, so as to which expansion work is partially recycled；Low pressure
Level compression unit and hiigh pressure stage compression unit using Large Piston formation multi-stage compression can be lifted compressor efficiency 20~
30%；So as to improve the reliability of heat pump, the power of the assembling unit is significantly improved, power is up to 1000KW；Thus, it is possible to lift heat
The application of pump, so as to replace boiler and central air-conditioning, as more energy efficient and environmentally friendly heating plant, reduces haze, section
Can emission reduction.
In the heating water heating of the partially recycled waste heat of air cooler, energy consumption is saved；The water of different temperatures in two-stage water tank
It can respectively be utilized, heating water is required respectively as compared with the heating water of low temperature requirements and higher temperature.
Brief description of the drawings
Fig. 1 is the structural representation of multi-stage compression double parallel piston type carbon dioxide heat pump system provided by the present invention
Figure；
Fig. 2 is three compressors and the coaxially connected schematic diagram of expanding machine.
In figure：1, evaporator；2, the first compressor；3, the second compressor；4, first order air cooler；
5, the first water tank；6, the 3rd compressor；7, second level air cooler；8, the second water tank；9, expanding machine；
10, auxiliary throttle valve；11, motor.
Embodiment
For present disclosure, feature and effect can be further appreciated that, following examples are hereby enumerated, and coordinate accompanying drawing detailed
It is described as follows:
As shown in figure 1, this embodiment discloses herein a kind of multi-stage compression double parallel piston type carbon dioxide heat pump system, should
System include evaporator 1, the first compressor 2, the second compressor 3, first order air cooler 4, the first water tank 5, the 3rd compressor 6,
Second level air cooler 7, the second water tank 8, expanding machine 9, auxiliary throttle valve 10, motor 11.Wherein, the first compressor 2, second compresses
Machine 3 is in parallel opposed as low-pressure stage compression unit, working medium it is impartial pass through the first compressor 2 and the second compressor 3, carry out simultaneously
The first order is compressed.Third level compressor 6 is coaxial opposed with expanding machine 9 as hiigh pressure stage compression unit, third level compressor 6 times
Receive expansion work.
The entrance of the outlet connection low-pressure stage compression unit of evaporator 1, low-pressure stage compression unit is by identical first
Compressor 2, the second compressor 3 opposed composition in parallel, the entrance of the outlet connection first order air cooler 4 of low-pressure stage compression unit,
The entrance of the 3rd compressor 6 of outlet connection of first order air cooler 4, the outlet connection second level air cooler 7 of the 3rd compressor 6
Entrance, the entrance of the outlet connection expanding machine 9 of second level air cooler 7, the outlet of expanding machine 9 connects entering for auxiliary throttle valve 10
Mouthful, the entrance of the outlet connection evaporator 1 of auxiliary throttle valve 10.
Wherein, the first compressor 2, the second compressor 3, the 3rd compressor 6 are piston type, and expanding machine 9 is also piston type.
Also, the first compressor 2, the second compressor 3, the 3rd compressor 6 are Large Piston, Large Piston refer to refrigerating capacity or
Heating capacity divides the piston that unit refrigerating capacity or heating capacity can be made to reach more than 600kw.Motor 11 is driven by same main shaft
Dynamic first compressor 2, the second compressor 3, the 3rd compressor 6 work；Expanding machine 9 is also connected to same main shaft, and expanding machine 9 is exported
Mechanical work can drive the 3rd compressor 6, make expansion work partially recycled.
First compressor 2, the second compressor 3 are in parallel, and opposed to refer to that the first compressor 2, the second compressor 3 are connected to same
Main shaft and equal with the eccentric throw of main shaft.3rd compressor 6, expanding machine 9 are coaxially opposed to refer to that the 3rd compressor 6, expanding machine 9 connect
It is connected to same main shaft and equal with the eccentric throw of main shaft.Between such compressor 3 of first compressor 2 and second, the 3rd compressor 6
The balance of terms of mechanics can be reached between expanding machine 9, mitigates the influence of an inertia force and moment of inertia, reaches that elimination is made an uproar
The purpose of sound, while improving the kinematic accuracy and moving equilibrium of mechanism, reduces the abrasion and fatigue failure of parts, improves the longevity
Life, it is ensured that operation stability.
The selection of Large Piston and the first compressor 2 and the second compressor 3 are in parallel is used as low-pressure stage compression unit, the
Three compressors 6 can lift compression ratio as the design of hiigh pressure stage compression unit, lift the power of the assembling unit, reach lifting heating capacity
The effect of (refrigerating capacity).When refrigerating capacity or big heating capacity, piston size also can be accordingly larger, to ensure that unit safety is stable
Property, rotating speed must not be too fast, and linear velocity is limited herein and is advisable no more than 10m/s.Lubricating oil can not be used to carry out when rotating speed is slower
Lubrication, while the sealing function of original lubricating oil is substituted using gasket seal, the first compressor 2, the second compressor the 3, the 3rd pressure
Lubricating oil inside contracting machine and expanding machine 9 can be well sealed, then the substantially oil-free operation of feasible system, with
Preferably prevent the leakage problem of lubricating oil, further improving heat exchanging efficiency.
First order air cooler 4 and second level air cooler 7 are used to reclaim waste heat, save energy consumption.First order air cooler 4 is set
Put in the first water tank 5, second level air cooler 7 is arranged in the second water tank 8.Higher temperatures working medium adds by first order air cooler 4
Water in hot first water tank 5, for being heated compared with low temperature requirements；High temperature refrigerant is heated in the second water tank 8 by second level air cooler 7
Water, for higher temperatures require heat.First water tank 5 is different with water temperature in the second water tank 8, and can be separately mounted to different temperatures needs
The environment asked is utilized respectively, and improves efficiency of energy utilization.
The multi-stage compression double parallel piston type carbon dioxide heat pump system of the present invention, its course of work is as follows：
Motor 11 drives system operation, and carbon dioxide working medium enters low-pressure stage compression unit from evaporator 1, and working medium is equably
It is divided into two parts into the first compressor 2 and the second compressor 3.Two parts working medium is carried out after the first second compression simultaneously, from low pressure
Level compression unit enters first order air cooler 4, and working medium is by the heat exchange of water in the water tank 5 of first order air cooler 4 and first, to water the
Once heat, working medium is then to carry out isobaric cooling, reduces temperature.Working medium is carried out through first order air cooler 4 into the 3rd compressor 6
Second of compression process, working medium enters second level air cooler 7 after the second second compression, reduces Temperature of Working and to the second water tank
Water heating in 8.Working medium passes through two stages of compression cooling during rolling process, and reduction exhaust final temperature saves work done during compression, improves efficiency.Work
Matter enters expanding machine 9 by second level air cooler 7, and the compressor 6 of expanding machine 9 and the 3rd is piston type and coaxial rotating, expansion work
It can be reclaimed by the 3rd compressor 6.Working medium is by the reduction of cooling during rolling temperature, density increase, it is easy to further compression, than once
Compression can greatly save wasted work amount.Complete after expansion process, working medium returns to evaporator 1 by auxiliary throttle valve 10, complete system
Cold process, circulation can be repeated.
It can be seen that, multi-stage compression double parallel piston type carbon dioxide heat pump system of the invention, by using Large Piston
Classification is in parallel, and the intercooled mode of multi-stage compression lifts compression ratio and heating capacity (refrigerating capacity), can reach its power
1000KW；The use of Large Piston and gasket seal can realize that non-oil ultra high vacuum system is run, improving heat exchanging efficiency；It is in parallel opposed and coaxial
Opposed design can mitigate the influence of an inertia force and moment of inertia, reduce noise, lifting system life-span, improve efficiency,
Ensure system run all right；Therefore whole system is reliable, and whole structure is excellent, can replace boiler, central hollow Power Regulation
Rate, lifts the utilization scope of heat pump.
It is of the invention although the preferred embodiments of the present invention are described above in conjunction with accompanying drawing and preferred embodiment
Be not limited to above-mentioned embodiment, above-mentioned embodiment is only schematical, be not it is restricted,
One of ordinary skill in the art is not departing from present inventive concept and scope of the claimed protection under the enlightenment of the present invention
In the case of, the specific conversion of many forms can also be made, these are belonged within protection scope of the present invention.
Claims (3)
1. a kind of multi-stage compression double parallel piston type carbon dioxide heat pump system, the system includes evaporator (1), its feature exists
In, the entrance of the outlet connection low-pressure stage compression unit of the evaporator (1), the low-pressure stage compression unit is by identical
First compressor (2), the second compressor (3) opposed composition in parallel, the outlet connection first order gas of the low-pressure stage compression unit
The entrance of cooler (4), the outlet of the first order air cooler (4) connects the entrance of the 3rd compressor (6), the 3rd compressor
(6) entrance of outlet connection second level air cooler (7), the outlet of the second level air cooler (7) connects entering for expanding machine (9)
Mouthful, the entrance of the outlet connection auxiliary throttle valve (10) of the expanding machine (9), the outlet connection institute of the auxiliary throttle valve (10)
State the entrance of evaporator (1).
First compressor (2), second compressor (3), the 3rd compressor (6) are connected to by same main shaft
Motor (11) is simultaneously driven by motor (11), and the 3rd compressor (6) is as hiigh pressure stage compression unit, with the expanding machine (9)
Coaxial opposed, expanding machine 9 is also connected to the main shaft, drives the 3rd compressor (6) to reclaim expansion work.
2. a kind of multi-stage compression double parallel piston type carbon dioxide heat pump system according to claim 1, its feature exists
In first compressor (2), second compressor (3), the 3rd compressor (6) are piston type and use big
Type piston, the expanding machine (9) is also piston type.
3. a kind of multi-stage compression double parallel piston type carbon dioxide heat pump system according to claim 1, its feature exists
In the first order air cooler (4) is arranged in the first water tank (5), and the second level air cooler (7) is arranged on the second water tank
(8) in.
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| CN201710385497.7A CN107144040B (en) | 2017-05-26 | 2017-05-26 | Multistage compression double-compressor parallel piston type carbon dioxide heat pump system |
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| CN201710385497.7A CN107144040B (en) | 2017-05-26 | 2017-05-26 | Multistage compression double-compressor parallel piston type carbon dioxide heat pump system |
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Cited By (4)
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| CN108533329A (en) * | 2018-03-26 | 2018-09-14 | 西安交通大学 | LNG cold energy use systems in a kind of LNG receiving stations |
| CN110470067A (en) * | 2018-05-11 | 2019-11-19 | 松下冷链（大连）有限公司 | A kind of carbon dioxide refrigerant two-stage pressurization convertible device in parallel with single-stage |
| WO2021063266A1 (en) * | 2019-09-30 | 2021-04-08 | 约克（无锡）空调冷冻设备有限公司 | Load balancing method for two compressors |
| EP4040074A4 (en) * | 2019-09-30 | 2023-10-25 | York (Wuxi) Air Conditioning And Refrigeration Co., Ltd. | Load balancing method for two compressors |
| CN111692789A (en) * | 2020-06-23 | 2020-09-22 | 郭雪虎 | Heating method of integrated air energy heat pump machine |
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