CN104567069A - Singe- and double-stage overlapped type air source heat pump heating system - Google Patents
Singe- and double-stage overlapped type air source heat pump heating system Download PDFInfo
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- CN104567069A CN104567069A CN201510031584.3A CN201510031584A CN104567069A CN 104567069 A CN104567069 A CN 104567069A CN 201510031584 A CN201510031584 A CN 201510031584A CN 104567069 A CN104567069 A CN 104567069A
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
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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
- 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
- F25B49/022—Compressor control arrangements
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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
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/14—Compression machines, plants or systems characterised by the cycle used
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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)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention relates to a single- and double-stage overlapped type air source heat pump heating system. The system comprises a low-temperature-stage heat pump unit and a high-temperature-stage heat pump unit; the low-temperature-stage heat pump unit is equipped with a low-temperature-stage compressor, a low-temperature-stage condenser, a low-temperature-stage throttling valve and a low-temperature-stage evaporator; the high-temperature-stage heat pump unit is equipped with a high-temperature-stage compressor, a high-temperature-stage condenser, a high-temperature-stage throttling valve and a high-temperature-stage evaporator; the low-temperature-stage heat pump unit and the high-temperature-stage heat pump set are coupled at the high-temperature-stage evaporator to exchange heat; a load circulating circuit is respectively coupled with the low-temperature-stage heat pump unit and the high-temperature-stage heat pump unit at the low-temperature-stage condenser and the high-temperature-stage condenser to exchange heat. The system has the advantages of being high in structure, low in cost, high in efficiency, and high in energy efficiency ratio.
Description
Technical field
The present invention relates to heat pump air conditioner field, especially relate to a kind of single twin-stage overlapping air source heat pump heating system.
Background technology
Tradition heating system mainly adopts and consumes the high potential such as combustion gas or coal source, provides the heat of low temperature by boiler and the circulatory system to Indoor environment, and to refuses such as environmental emission used heat, waste gas, waste residues.Based on economize energy and an urgent demand avoiding environmental pollution, this one-way heating system cannot meet the energy at present, supply the needs of warm harmonious development.Current the art mainly adopts heat pump techniques to solve the problem of energy consumption of HVAC and harmonious development, and development and using heat pump technology have become the important technical of HVAC sustainable development.
Air source heat pump is using outdoor air as low-temperature heat source, and because air is ubiquitous, and clean free, this is that air source heat pump provides the foundation as a kind of excellent energy-saving heating technology.Air source heat pump have employed the technical measures improving cold operation characteristic, greatly can delay the decay of heating capacity with outside air temperature, even also can running lower than when-20 DEG C, but weigh from the efficiency of heat supply and the Energy Efficiency Ratio of system, when temperature is lower than-10 DEG C, the leaving air temp of air source heat pump system and performance cannot give full play to the advantage of heat pump techniques.
For the problem of air source heat pump system degraded performance under solution cryogenic conditions, those skilled in the art mainly have employed increasing compressor capacity, strengthen the measures such as the area of outdoor heat exchanger, or apply the technology such as liquid injection bypass, gas injection, frequency control, two-stage compression cycle, but all due to system complex, technological requirement is high, efficiency is low, cost is high, COP (Energy Efficiency Ratio) value is low, and the application of air source heat pump is extremely restricted.In recent years, air source heat pump technology have also been obtained extensive use in China, in China Yangtze river basin, climatic characteristic is that Xia Redong is cold, relatively more suitable application of air source heat pump refrigerating and heating unit is as the Cooling and Heat Source of Indoor environment, but in the northern area of China, because outside air temperature in winter is lower, air source heat pump technology fails to be used widely equally.Therefore, the important technological problems that air source heat pump system performance has at low ambient temperatures become this area needs solution how is improved.
Summary of the invention
The object of this invention is to provide a kind of single twin-stage overlapping air source heat pump heating system, structure is simple, cost is low, efficiency is high, Energy Efficiency Ratio is high advantage that it has.
For solving the technical problem existed in prior art, a kind of single twin-stage overlapping air source heat pump heating system of the present invention, comprise low-temperature level source pump and high-temperature level source pump, low-temperature level source pump is provided with low-temperature level compressor, low-temperature level condenser, low-temperature level choke valve and low-temperature level evaporimeter; High-temperature level source pump is provided with high-temperature level compressor, high-temperature level condenser, high-temperature level choke valve and high-temperature level evaporimeter; Low-temperature level source pump and high-temperature level source pump carry out Coupling Thermal exchange at high-temperature level evaporimeter place; Coupling Thermal exchange is carried out in low-temperature level condenser and high-temperature level condenser place and low-temperature level source pump and high-temperature level source pump respectively in load cycle loop.
Preferably, low-temperature level source pump is also provided with gas-liquid separator, and gas-liquid separator is used for carrying out gas-liquid separation to the cycle fluid in low-temperature level source pump.
Preferably, low-temperature level source pump is also provided with four-way switching valve, and four-way switching valve is for changing the flow direction of cycle fluid in low-temperature level source pump.
Preferably, low-temperature level source pump adopts frequency conversion or plural parallel stage structure, and frequency conversion or plural parallel stage structure are for regulating the capacity of low-temperature level source pump.
Preferably, the low-temperature level evaporimeter in low-temperature level source pump is disposed in the outdoor.
Preferably, hot gas defrosting unit is also provided with in low temperature group source pump.
Preferably, also comprise control unit, control unit is provided with temperature-detecting device and PLC, and control unit is used for temperature detection and controls the operational factor of each parts.
Compared with conventional air source heat pump system, a kind of single twin-stage overlapping air source heat pump heating system of the present invention has the following advantages: 1) a kind of single twin-stage overlapping air source heat pump heating system of the present invention adopts Split type structure design, only by disposed in the outdoor for low-temperature level evaporimeter, solve conventional air source source pump under worst cold case, lubricating oil accumulates in the problem causing compressor oil starvation in gas-liquid separator, solve simultaneously and lubricate viscosity increase at low temperatures and cause during startup and lose oily problem, decrease the radiation loss of compression case.2) present invention achieves single twin-stage and separate the method for operation, not only avoiding traditional overlapping air source heat pump system can not the problem of isolated operation one compressor, improves the COP value of system simultaneously.3) along with the reduction of outdoor temperature, the heat of indoor needs gets more and more, and the heating load of air source heat pump is fewer and feweri.The present invention adopts the capacity of converter technique or multi-machine parallel connection structure increasing low-temperature level compressor or twin-stage to run and solves this problem, low-temperature level condenser and high-temperature level evaporimeter become two series operation condensers of cryogenic system, meet the demand that low-temperature level compressor is amplified well.4) when outside air temperature is higher, if temperature is at-5 ~ 5 DEG C, during humidity φ >70%, air source heat pump is easy to frosting.The present invention is also provided with hot gas defrost system in low-temperature level single-stage operational system, and using heating system as the thermal source of defrosting, and solving air source heat pump system because of frosting affects the problem of performance.
Below in conjunction with detailed description of the invention shown in accompanying drawing, a kind of single twin-stage overlapping air source heat pump heating system of the present invention is described in further detail:
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of single twin-stage overlapping air source heat pump heating system detailed description of the invention of the present invention.
Detailed description of the invention
The detailed description of the invention of a kind of single twin-stage overlapping air source heat pump heating system of the present invention as shown in Figure 1, comprise low-temperature level source pump and high-temperature level source pump, low-temperature level source pump is provided with low-temperature level compressor 1, low-temperature level condenser 2, low-temperature level choke valve 3 and low-temperature level evaporimeter 4; High-temperature level source pump is provided with high-temperature level compressor 5, high-temperature level condenser 6, high-temperature level choke valve 7 and high-temperature level evaporimeter 8; Low-temperature level source pump and high-temperature level source pump carry out Coupling Thermal exchange at high-temperature level evaporimeter 8 place; Coupling Thermal exchange is carried out in low-temperature level condenser 2 and high-temperature level condenser 6 place and low-temperature level source pump and high-temperature level source pump respectively in load cycle loop.
In present embodiment, low-temperature level source pump is also provided with gas-liquid separator 9 and four-way switching valve 10, gas-liquid separator 9 is for carrying out gas-liquid separation to the cycle fluid in low-temperature level source pump, to improve the usefulness of low-temperature level pump assembly, four-way switching valve 10 for changing the flow direction of cycle fluid in low-temperature level source pump, to expand the scope of application of the present invention.
It should be noted that, in present embodiment, low-temperature level source pump adopts frequency conversion or plural parallel stage structure, can regulate the capacity of low-temperature level source pump, satisfy the demands with the heating capacity and supply water temperature that improve system according to factors such as outside air temperatures.And by disposed in the outdoor for the low-temperature level evaporimeter 4 in low-temperature level source pump, the problem causing compressor oil starvation is accumulated in gas-liquid separator to solve lubricating oil, minimizing is lubricated viscosity increase at low temperatures and is caused the problem losing oil during startup, reduces the radiation loss of compression case simultaneously.
In addition, present embodiment is also provided with control unit (not shown) and hot gas defrosting unit (not shown), control unit is provided with temperature-detecting device and PLC, control unit is used for temperature detection and controls the operational factor of each parts, to improve automatic management degree, economize energy.Hot gas defrosting unit is located in low-temperature level source pump, and using heating system as defrosting thermal source, for when outside air temperature is higher, as at 5 ~-5 DEG C, during φ >70%, is the defrosting of low-temperature level source pump.
For helping those skilled in the art more clearly to understand the present invention, below the running of a kind of single twin-stage overlapping air source heat pump heating system of the present invention is described in further detail.The present invention mainly with winter high temperature heating condition, winter low temperature heating condition and cooling in summer operating mode Three models run.
Under winter high temperature heating condition, high-temperature level source pump is out of service, high-temperature level compressor 5, high-temperature level condenser 6, high-temperature level choke valve 7, high-temperature level evaporimeter 8 does not work, low-temperature level source pump carries out heating operation in normal air source heat pump system mode, air carries out heat exchange at low-temperature level evaporimeter 4 place and low-temperature level source pump, low-temperature level evaporimeter 4 absorbs the heat in air, low-temperature level source pump is evaporated at low-temperature level evaporimeter 4 place by cycle fluid again, at low-temperature level compressor 1, place compresses, at gas-liquid separator 9, place carries out gas-liquid separation, condensation is carried out at low-temperature level condenser 2, at low-temperature level choke valve 3, place carries out the processes such as throttling, heat exchange is carried out at low-temperature level condenser 2 place and load cycle loop, load cycle loop absorbs heat from low-temperature level condenser 2, realize low-temperature heating work, for end user's heating, iterative cycles like this runs.
Under winter low temperature heating condition, when outside air temperature is lower, if only run single stage compress heat pump, compression ratio can be made excessive, not only can reduce the COP value of system, and single level system can be caused normally to run due to the excessive discharge temperature of compressor.In such cases, high-temperature level source pump puts into operation, the present invention is converted to superposition type two-stage compression cycle by single stage compress, on the one hand, low-temperature level source pump heats in normal air source heat pump system mode, air carries out heat exchange at low-temperature level evaporimeter 4 place and low-temperature level source pump, low-temperature level evaporimeter 4 absorbs the heat in air, low-temperature level source pump is evaporated at low-temperature level evaporimeter 4 place by cycle fluid again, at low-temperature level compressor 1, place compresses, at gas-liquid separator 9, place carries out gas-liquid separation, condensation is carried out at low-temperature level condenser 2, at low-temperature level choke valve 3, place carries out the processes such as throttling, heat exchange is carried out at low-temperature condenser 2 place and load cycle loop, load cycle loop absorbs heat from low-temperature level condenser 2, realize low-temperature heating work, on the other hand, cycle fluid in low-temperature level source pump is as the low-temperature heat source of high-temperature level source pump, heat exchange is carried out at high-temperature level evaporimeter 8 place and high-temperature level source pump, high-temperature level evaporimeter 8 absorbs heat, high-temperature level source pump carries out heat exchange by cycle fluid condensation, compression, evaporation, throttling process at high-temperature level condenser 6 place and load cycle loop again, load cycle loop absorbs heat from high-temperature level condenser 6, realizes high temperature and heats work.Under this operating mode, run by the low-temperature heating of low-temperature level source pump and the high temperature heating operation of high-temperature level source pump jointly for load cycle loop provides heat, reach winter low temperature and to heat object.
Under cooling in summer operating mode, high-temperature level source pump is out of service, high-temperature level compressor 5, high-temperature level condenser 6, high-temperature level choke valve 7, high-temperature level evaporimeter 8 do not work, low-temperature level source pump carries out refrigerating operaton in normal air source heat pump system mode, and change the cycle fluid flow direction by four-way switching valve 10, now low-temperature level condenser 2 and low-temperature level evaporimeter 4 exchange function.Air carries out heat exchange at low-temperature level evaporimeter 4 place and low-temperature level source pump, low-temperature level evaporimeter 4 is to release heat in air, low-temperature level source pump carries out condensation by cycle fluid at low-temperature level evaporimeter 4 again, carry out at low-temperature level compressor 1 place compressing, carry out gas-liquid separation at gas-liquid separator 9 place, carry out evaporating, carrying out the processes such as throttling at low-temperature level choke valve 3 place at low-temperature level condenser 2, heat exchange is carried out at low-temperature level condenser 2 place and load cycle loop, heat in absorbing load closed circuit, iterative cycles like this runs, and realizes refrigeration work.
Above embodiment is only the description carried out the preferred embodiment of the present invention; the restriction not request protection domain of the present invention carried out; under not departing from the present invention and designing the prerequisite of spirit; the various forms of distortion that this area engineers and technicians make according to technical scheme of the present invention, all should fall in protection domain that claims of the present invention determine.
Claims (7)
1. a single twin-stage overlapping air source heat pump heating system, comprise low-temperature level source pump and high-temperature level source pump, it is characterized in that: low-temperature level source pump is provided with low-temperature level compressor (1), low-temperature level condenser (2), low-temperature level choke valve (3) and low-temperature level evaporimeter (4); High-temperature level source pump is provided with high-temperature level compressor (5), high-temperature level condenser (6), high-temperature level choke valve (7) and high-temperature level evaporimeter (8); Low-temperature level source pump and high-temperature level source pump carry out Coupling Thermal exchange at high-temperature level evaporimeter (8) place; Coupling Thermal exchange is carried out in low-temperature level condenser (2) and high-temperature level condenser (6) place and low-temperature level source pump and high-temperature level source pump respectively in load cycle loop.
2. according to one according to claim 1 single twin-stage overlapping air source heat pump heating system, it is characterized in that: described low-temperature level source pump is also provided with gas-liquid separator (9), gas-liquid separator (9) is for carrying out gas-liquid separation to the cycle fluid in low-temperature level source pump.
3. according to one according to claim 2 single twin-stage overlapping air source heat pump heating system, it is characterized in that: described low-temperature level source pump is also provided with four-way switching valve (10), four-way switching valve (10) is for changing the flow direction of cycle fluid in low-temperature level source pump.
4. according to one according to claim 3 single twin-stage overlapping air source heat pump heating system, it is characterized in that: described low-temperature level source pump adopts frequency conversion or plural parallel stage structure, and frequency conversion or plural parallel stage structure are for regulating the capacity of low-temperature level source pump.
5. according to one according to claim 4 single twin-stage overlapping air source heat pump heating system, it is characterized in that: the low-temperature level evaporimeter (4) in described low-temperature level source pump is disposed in the outdoor.
6. according to one according to claim 5 single twin-stage overlapping air source heat pump heating system, it is characterized in that: in described low temperature group source pump, be also provided with hot gas defrosting unit.
7. according to the one list twin-stage overlapping air source heat pump heating system described in any one of claim 1 to 6, it is characterized in that: also comprise control unit, control unit is provided with temperature-detecting device and PLC, and control unit is used for temperature detection and controls the operational factor of each parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510031584.3A CN104567069A (en) | 2015-01-22 | 2015-01-22 | Singe- and double-stage overlapped type air source heat pump heating system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510031584.3A CN104567069A (en) | 2015-01-22 | 2015-01-22 | Singe- and double-stage overlapped type air source heat pump heating system |
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| CN104567069A true CN104567069A (en) | 2015-04-29 |
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| CN201510031584.3A Pending CN104567069A (en) | 2015-01-22 | 2015-01-22 | Singe- and double-stage overlapped type air source heat pump heating system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106196683A (en) * | 2016-08-10 | 2016-12-07 | 燕园德普科技（北京）有限公司 | A kind of super low temperature heat pump system for heating and control method thereof |
| CN106288476A (en) * | 2016-09-23 | 2017-01-04 | 苏州热火能源科技有限公司 | A kind of cascade type heat pump of dual temperature-rise |
| WO2018045507A1 (en) * | 2016-09-07 | 2018-03-15 | 徐生恒 | Air-source two-stage heat-pump air-conditioning system |
| CN109737625A (en) * | 2019-03-04 | 2019-05-10 | 珠海格力电器股份有限公司 | Heat pump system, control method and heat pump drying device |
| CN111271891A (en) * | 2020-04-12 | 2020-06-12 | 江苏蓄能谷实业有限公司 | Crossed overlapping heat pump system |
| CN111780444A (en) * | 2020-06-03 | 2020-10-16 | 同济大学 | Vapor compression cascade heat pump cycle and single-stage heat pump cycle combined system |
| CN114353368A (en) * | 2021-12-20 | 2022-04-15 | 青岛海尔空调电子有限公司 | Defrosting method and device for heat pump drying equipment and heat pump drying equipment |
| CN115315604A (en) * | 2019-06-04 | 2022-11-08 | 特灵技术生命科学有限责任公司 | Hot gas defrosting control system and method for multi-stage cascade refrigeration system |
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| JP2012172890A (en) * | 2011-02-21 | 2012-09-10 | Mitsubishi Electric Corp | Refrigerating apparatus |
| CN204630134U (en) * | 2015-01-22 | 2015-09-09 | 北京万方同泰能源科技有限公司 | A kind of single twin-stage overlapping air source heat pump heating system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2012172890A (en) * | 2011-02-21 | 2012-09-10 | Mitsubishi Electric Corp | Refrigerating apparatus |
| CN204630134U (en) * | 2015-01-22 | 2015-09-09 | 北京万方同泰能源科技有限公司 | A kind of single twin-stage overlapping air source heat pump heating system |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106196683A (en) * | 2016-08-10 | 2016-12-07 | 燕园德普科技（北京）有限公司 | A kind of super low temperature heat pump system for heating and control method thereof |
| WO2018045507A1 (en) * | 2016-09-07 | 2018-03-15 | 徐生恒 | Air-source two-stage heat-pump air-conditioning system |
| CN106288476A (en) * | 2016-09-23 | 2017-01-04 | 苏州热火能源科技有限公司 | A kind of cascade type heat pump of dual temperature-rise |
| CN109737625A (en) * | 2019-03-04 | 2019-05-10 | 珠海格力电器股份有限公司 | Heat pump system, control method and heat pump drying device |
| CN109737625B (en) * | 2019-03-04 | 2023-07-25 | 珠海格力电器股份有限公司 | Heat pump system, control method and heat pump drying device |
| CN115315604A (en) * | 2019-06-04 | 2022-11-08 | 特灵技术生命科学有限责任公司 | Hot gas defrosting control system and method for multi-stage cascade refrigeration system |
| CN115315604B (en) * | 2019-06-04 | 2024-01-12 | 特灵技术生命科学有限责任公司 | Hot gas defrosting control system and method for multi-stage cascade refrigeration system |
| CN111271891A (en) * | 2020-04-12 | 2020-06-12 | 江苏蓄能谷实业有限公司 | Crossed overlapping heat pump system |
| CN111780444A (en) * | 2020-06-03 | 2020-10-16 | 同济大学 | Vapor compression cascade heat pump cycle and single-stage heat pump cycle combined system |
| CN111780444B (en) * | 2020-06-03 | 2021-12-31 | 同济大学 | Vapor compression cascade heat pump cycle and single-stage heat pump cycle combined system |
| CN114353368A (en) * | 2021-12-20 | 2022-04-15 | 青岛海尔空调电子有限公司 | Defrosting method and device for heat pump drying equipment and heat pump drying equipment |
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