CN111271891A - Crossed overlapping heat pump system - Google Patents
Crossed overlapping heat pump system Download PDFInfo
- Publication number
- CN111271891A CN111271891A CN202010282541.3A CN202010282541A CN111271891A CN 111271891 A CN111271891 A CN 111271891A CN 202010282541 A CN202010282541 A CN 202010282541A CN 111271891 A CN111271891 A CN 111271891A
- Authority
- CN
- China
- Prior art keywords
- temperature
- low
- stage
- condenser
- heat pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D15/00—Other domestic- or space-heating systems
- F24D15/04—Other domestic- or space-heating systems using heat pumps
-
- 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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/003—Filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
Landscapes
- 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)
- Combustion & Propulsion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention provides a cross-type cascade heat pump system, which at least comprises: the system comprises a low-temperature stage compressor (1), a four-way valve (2), a low-temperature stage condenser (3), an intermediate heat exchanger (4), a low-temperature stage throttling device (5), a low-temperature stage evaporator (6), a high-temperature stage compressor (7), a high-temperature stage condenser (8), a high-temperature stage throttling device (9), a heat supply medium inlet (10) and a heat supply medium outlet (11); the system is additionally provided with a low-temperature-level condenser in the low-temperature level of the cascade heat pump, the low-temperature-level condenser is connected with the intermediate heat exchanger through a refrigerant and is also connected with the high-temperature-level condenser through a heat supply medium to form a cross-type cascade heat pump system, the high-temperature level and the low-temperature level are coupled through the intermediate heat exchanger, the system is subjected to evaporation/condensation reversing through a four-way valve to realize a hot gas defrosting function, the low-temperature-level evaporator and the low-temperature-level condenser are directly communicated with a cold and heat source, the high-temperature-level system of the system does not work in a.
Description
Technical Field
The invention relates to a cross-type cascade heat pump system, and belongs to the field of new energy technology and clean energy utilization.
Background
The clean heating is related to the nation-minded citizens, common people are not frozen, whether the haze weather can be effectively reduced or not is related to the haze weather, and whether the heating energy utilization structure can be really improved or not is related to the national civilian. Under the complicated veins of clean energy heating, the self limitation of various energy sources and the common problem of clean substitution are interwoven, and the clean energy source replaces coal to heat the road to be long. In the activities of coal reduction and blue increase and clean substitution in northern areas of China, the air source heat pump is used as an energy-saving and environment-friendly efficient heat supply product, becomes a main technical type adopted by a coal-to-electricity project of more provinces and markets in the northern areas, and is popularized and applied in a large scale. The air source heat pump utilizes heat in the air as a low-temperature heat source, consumes electric energy and sends the heat to a high-temperature heat source, under the ordinary condition, the heat pump unit consumes 1 kilowatt of electric energy and supplies 2-4 kilowatts of heat energy to users, compared with electric heating, the efficiency is improved by 2-4 times, but in cold regions, along with the reduction of outdoor environment temperature, the efficiency of a common single-stage heat pump is reduced rapidly, the heating capacity is attenuated rapidly, the comfort level of heating of people is influenced, and the operating cost is also greatly improved. In order to adapt to heating in severe cold areas, the two-stage cascade heat pump has the characteristics of strong low-temperature resistance and high heating efficiency, but the frosting problem can occur in the working process of the air source heat pump, the most effective defrosting mode in the prior art is that the heat pump four-way valve is reversed to perform hot gas defrosting, the defrosting mode is a defrosting mode from inside to outside, the defrosting speed is high, and the efficiency is high. The two-stage cascade heat pump is different from a single-stage heat pump, a high-temperature stage and a low-temperature stage need to work through coupling of an intermediate heat exchanger, the conventional cascade heat pump has high requirement on the accuracy of coupling time, if coupling time beats are not right, low-pressure alarm is easy to occur in the high-temperature stage, high-pressure alarm is easy to occur in the low-temperature stage, particularly, in the defrosting process, two four-way valves of the high-temperature stage and the low-temperature stage need to be subjected to double reversing, so that hot gas defrosting of the heat pump is realized, and coupling faults of.
Disclosure of Invention
The invention provides a cross-type cascade heat pump system, which aims to solve the problems and mainly adds a low-temperature-stage condenser in a low-temperature stage in the cascade heat pump system, wherein the low-temperature-stage condenser is connected with an intermediate heat exchanger through a refrigerant and is also connected with a high-temperature-stage condenser through a heat supply medium to form the cross-type cascade heat pump system, the time accuracy requirement of coupling the high-temperature stage and the low-temperature stage through the intermediate heat exchanger is greatly reduced, and the working stability of the cascade heat pump system is improved.
A cross-cascade heat pump system comprising: the system comprises a low-temperature-stage compressor, a four-way valve, a low-temperature-stage condenser, an intermediate heat exchanger, a low-temperature-stage throttling device, a low-temperature-stage evaporator, a high-temperature-stage compressor, a high-temperature-stage condenser, a high-temperature-stage throttling device, a heat supply medium inlet and a heat supply medium outlet; the low-temperature stage compressor in the system is connected with the four-way valve; the four-way valve is connected with the low-temperature-stage condenser; the low-temperature-stage condenser is connected with the intermediate heat exchanger; the intermediate heat exchanger is connected with the low-temperature-level throttling device; the low-temperature stage throttling device is connected with the low-temperature stage evaporator; the low-temperature evaporator is connected with the four-way valve; the high-temperature stage compressor is connected with the intermediate heat exchanger; the high-temperature-stage condenser is connected with the high-temperature-stage compressor; the high-temperature-stage throttling device is connected with the high-temperature-stage condenser; the heat supply medium inlet is connected with the low-temperature-level condenser; the heat supply medium outlet is connected with the high-temperature-level condenser.
Furthermore, the low-temperature-level condenser and the high-temperature-level condenser are both connected with a heat supply medium, and the heat supply medium, the low-temperature-level condenser and the high-temperature-level condenser can be connected in parallel or in series.
Further, the low-temperature-stage condenser is connected with the intermediate heat exchanger in series, and is arranged in front of the intermediate heat exchanger in the normal heating mode of the heat pump according to the flowing direction of the refrigerant, and is arranged behind the intermediate heat exchanger in the hot gas defrosting mode of the heat pump.
The low-temperature-stage condenser is additionally arranged in the low-temperature stage in the system, the low-temperature-stage condenser is not only connected with the intermediate heat exchanger through a refrigerant, but also connected with the high-temperature-stage condenser through a heat supply medium to form a cross-type cascade heat pump system, the time accuracy requirement of the high-temperature stage and the low-temperature stage coupled through the intermediate heat exchanger is greatly reduced, and the working stability of the cascade heat pump system is improved; particularly, in the defrosting process of the heat pump, the system can realize the hot gas defrosting function of the cascade heat pump only by carrying out evaporation/condensation reversing through one four-way valve, the low-temperature grade evaporator and the low-temperature grade condenser are directly communicated with a cold and heat source, and in the defrosting process, the high-temperature grade system of the system does not need to work and is not required to be coupled through an intermediate heat exchanger, so that the stability of the system is greatly improved, and the failure rate is greatly reduced.
Drawings
Fig. 1 is a schematic diagram of a cross-cascade heat pump system according to the present invention.
Fig. 2 is a schematic diagram of a cross-cascade heat pump system according to the present invention.
Fig. 3 is a schematic diagram of a cross-cascade heat pump system according to the present invention.
Reference numeral 1:
(1) a low temperature stage compressor; (2) a four-way valve; (3) a low temperature stage condenser; (4) an intermediate heat exchanger; (5) a low temperature stage throttling device; (6) a low temperature stage evaporator; (7) a high temperature stage compressor; (8) a high temperature stage condenser; (9) a high temperature stage throttling device; (10) a heat supply medium inlet; (11) and a heat supply medium outlet.
The attached figure 2 marks:
the same as the attached figure 1.
Reference numeral 3:
(12) a low temperature stage compressor; (13) a low temperature stage gas-liquid separator; (14) a low temperature stage filter drier; (15) high temperature stage drier-filter.
Detailed Description
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a schematic diagram of a cross-type cascade heat pump system includes: the system comprises a low-temperature stage compressor (1), a four-way valve (2), a low-temperature stage condenser (3), an intermediate heat exchanger (4), a low-temperature stage throttling device (5), a low-temperature stage evaporator (6), a high-temperature stage compressor (7), a high-temperature stage condenser (8), a high-temperature stage throttling device (9), a heat supply medium inlet (10) and a heat supply medium outlet (11).
Specifically, the medium-low temperature stage compressor (1) is connected with the four-way valve (2); the four-way valve (2) is connected with the low-temperature-stage condenser (3); the low-temperature-stage condenser (3) is connected with the intermediate heat exchanger (4); the intermediate heat exchanger (4) is connected with the low-temperature throttling device (5); the low-temperature throttling device (5) is connected with the low-temperature evaporator (6); the low-temperature evaporator (6) is connected with the four-way valve (2); the high-temperature stage compressor (7) is connected with the intermediate heat exchanger (4); the high-temperature-stage condenser (8) is connected with the high-temperature-stage compressor (7); the high-temperature stage throttling device (9) is connected with the high-temperature stage condenser (8); the heat supply medium inlet (10) is connected with the low-temperature-level condenser (3); the outlet of the heat supply medium is connected with a high-temperature-level condenser (8). A low-temperature-stage condenser (3) is added in the low-temperature stage, the low-temperature-stage condenser (3) is not only connected with the intermediate heat exchanger (4) through a refrigerant, but also connected with the high-temperature-stage condenser (8) through a heat supply medium to form a cross-type cascade heat pump system, the time accuracy requirement of the high-temperature stage and the low-temperature stage coupled through the intermediate heat exchanger (4) is greatly reduced, and the working stability of the cascade heat pump system is improved; particularly, in the defrosting process of the heat pump, the system can realize the hot gas defrosting function of the cascade heat pump only by carrying out evaporation/condensation reversing through the four-way valve (2), the low-temperature-stage evaporator (6) and the low-temperature-stage condenser (3) are directly communicated with a cold and heat source, and in the defrosting process, the high-temperature-stage system of the system does not need to work and is not coupled through the intermediate heat exchanger (4), so that the stability of the system is greatly improved, and the failure rate is greatly reduced.
Furthermore, the low-temperature-level condenser (3) and the high-temperature-level condenser (8) are both connected with a heat supply medium, and the connection form of the heat supply medium, the low-temperature-level condenser (3) and the high-temperature-level condenser (8) can be a parallel connection form; or in series as shown in fig. 2.
Furthermore, the low-temperature-stage condenser (3) and the intermediate heat exchanger (4) are connected in series, according to the flowing direction of the refrigerant, the low-temperature condenser (3) is arranged in front of the intermediate heat exchanger (4) in the normal heating mode of the heat pump, and the low-temperature condenser (3) is arranged behind the intermediate heat exchanger (4) in the hot gas defrosting mode of the heat pump.
Further, as shown in fig. 3, there may be a plurality of low-temperature stage compressors, the low-temperature stage compressor (1) and the low-temperature stage compressor (12) are connected in parallel, and there may be a plurality of high-temperature stage compressors connected in parallel, so as to increase the system capacity and facilitate unloading; a gas-liquid separator (13) can be added between the low-temperature stage compressor (1) and the four-way valve (2), and a gas-liquid separator can be added between the high-temperature stage compressor (7) and the intermediate heat exchanger (4) to prevent liquid impact of the compressor; a drying filter (14) can be added in front of the low-temperature throttling device (5), and a drying filter and a purification system can be added in front of the high-temperature throttling device (9) to prevent blockage; the low-temperature-stage condenser (3) or the high-temperature-stage condenser (8) may be added with a liquid storage tank after the low-temperature-stage condenser or the high-temperature-stage condenser if the liquid storage capacity is not high or is insufficient.
Preferably, the low-temperature stage compressor (1) and the high-temperature stage compressor (7) can be one or more of a scroll compressor, a rotor compressor, a piston compressor, a screw compressor and a centrifugal compressor.
Preferably, the low-temperature-stage condenser (3) and the high-temperature-stage condenser (8) can be one or more of a shell-and-tube heat exchanger, a double-tube heat exchanger, a plate heat exchanger and a finned tube heat exchanger.
Preferably, the intermediate heat exchanger (4) can be one or more of a shell-and-tube heat exchanger, a double-tube heat exchanger and a plate heat exchanger.
Preferably, the low-temperature-stage throttling device (5) and the high-temperature-stage throttling device (9) can be one or more of a thermal expansion valve, an electronic expansion valve and a capillary tube.
Preferably, the low-temperature-stage evaporator (6) can be one or more of a finned tube heat exchanger, a shell-and-tube heat exchanger, a double-tube heat exchanger and a plate heat exchanger.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather as the subject matter of the invention is to be construed in all aspects and as broadly as possible.
Claims (5)
1. A cross-type cascade heat pump system is characterized in that a low-temperature stage compressor (1) is connected with a four-way valve (2); the four-way valve (2) is connected with the low-temperature-stage condenser (3); the low-temperature-stage condenser (3) is connected with the intermediate heat exchanger (4); the intermediate heat exchanger (4) is connected with the low-temperature throttling device (5); the low-temperature throttling device (5) is connected with the low-temperature evaporator (6); the low-temperature evaporator (6) is connected with the four-way valve (2); the high-temperature stage compressor (7) is connected with the intermediate heat exchanger (4); the high-temperature-stage condenser (8) is connected with the high-temperature-stage compressor (7); the high-temperature stage throttling device (9) is connected with the high-temperature stage condenser (8); the heat supply medium inlet (10) is connected with the low-temperature-level condenser (3); the outlet of the heat supply medium is connected with a high-temperature-level condenser (8).
2. A cross-type cascade heat pump system according to claim 1, wherein a low-temperature stage condenser (3) is added to a low-temperature stage in the cascade heat pump system, the low-temperature stage condenser (3) is connected with the intermediate heat exchanger (4) through a refrigerant and is also connected with a high-temperature stage condenser (8) through a heat supply medium to form the cross-type cascade heat pump system, the time accuracy requirement for coupling the high-temperature stage and the low-temperature stage through the intermediate heat exchanger (4) is greatly reduced, and the stability of the operation of the cascade heat pump system is improved.
3. A cross-type cascade heat pump system according to claim 1, wherein the low-temperature-stage condenser (3) and the high-temperature-stage condenser (8) are both connected with a heat supply medium, and the heat supply medium can be connected with the low-temperature-stage condenser (3) and the high-temperature-stage condenser (8) in parallel or in series.
4. A cross-cascade heat pump system according to claim 1, characterized in that the low-temperature stage condenser (3) is connected in series with the intermediate heat exchanger (4) in such a way that, in the direction of flow of the refrigerant, the heat pump is in normal heating mode with the low-temperature stage condenser (3) in front of the intermediate heat exchanger (4) and in heat pump hot gas defrosting mode with the low-temperature stage condenser (3) behind the intermediate heat exchanger (4).
5. A cross-type cascade heat pump system according to claim 1, wherein there are multiple low-temperature stage compressors, the low-temperature stage compressor (1) and the low-temperature stage compressor (12) are connected in parallel, and there are multiple high-temperature stage compressors, which are connected in parallel, to increase system capacity and facilitate unloading; a gas-liquid separator (13) can be added between the low-temperature stage compressor (1) and the four-way valve (2), and a gas-liquid separator can be added between the high-temperature stage compressor (7) and the intermediate heat exchanger (4) to prevent liquid impact of the compressor; a drying filter (14) can be added in front of the low-temperature throttling device (5), and a drying filter and a purification system can be added in front of the high-temperature throttling device (9) to prevent blockage; if the low-temperature-stage condenser (3) or the high-temperature-stage condenser (8) has no or insufficient liquid storage capacity, a liquid storage tank can be added thereafter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010282541.3A CN111271891A (en) | 2020-04-12 | 2020-04-12 | Crossed overlapping heat pump system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010282541.3A CN111271891A (en) | 2020-04-12 | 2020-04-12 | Crossed overlapping heat pump system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111271891A true CN111271891A (en) | 2020-06-12 |
Family
ID=70998318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010282541.3A Pending CN111271891A (en) | 2020-04-12 | 2020-04-12 | Crossed overlapping heat pump system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111271891A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2144635A1 (en) * | 1971-09-07 | 1973-03-22 | Hugo Dipl Ing Schantz | SYSTEM FOR THE PREVENTION OF ICING IN A LOW TEMPERATURE EVAPORATOR OF A REFRIGERATION SYSTEM USING WASTE HEAT |
| DE2403328A1 (en) * | 1974-01-24 | 1975-08-07 | Stiebel Eltron Gmbh & Co Kg | METHOD OF HEATING ROOMS OF A BUILDING AND HEATING SYSTEM |
| CN104567069A (en) * | 2015-01-22 | 2015-04-29 | 北京万方同泰能源科技有限公司 | Singe- and double-stage overlapped type air source heat pump heating system |
| CN208124664U (en) * | 2018-03-14 | 2018-11-20 | 深圳市派沃新能源科技股份有限公司 | A kind of superposition type super low temperature heat pump water chiller-heater unit |
-
2020
- 2020-04-12 CN CN202010282541.3A patent/CN111271891A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2144635A1 (en) * | 1971-09-07 | 1973-03-22 | Hugo Dipl Ing Schantz | SYSTEM FOR THE PREVENTION OF ICING IN A LOW TEMPERATURE EVAPORATOR OF A REFRIGERATION SYSTEM USING WASTE HEAT |
| DE2403328A1 (en) * | 1974-01-24 | 1975-08-07 | Stiebel Eltron Gmbh & Co Kg | METHOD OF HEATING ROOMS OF A BUILDING AND HEATING SYSTEM |
| CN104567069A (en) * | 2015-01-22 | 2015-04-29 | 北京万方同泰能源科技有限公司 | Singe- and double-stage overlapped type air source heat pump heating system |
| CN208124664U (en) * | 2018-03-14 | 2018-11-20 | 深圳市派沃新能源科技股份有限公司 | A kind of superposition type super low temperature heat pump water chiller-heater unit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108759144A (en) | A kind of superposition type ultra-low temperature air source heat pump unit and its control method | |
| CN101140122B (en) | Heat pump machine group of combined throttling set | |
| CN201983541U (en) | Air-conditioning refrigeration system and air conditioner | |
| CN101290177A (en) | Heat pump -type subway vehicle air conditioner | |
| CN111141054A (en) | Transcritical two-stage supercooling injection carbon dioxide system and application | |
| CN208794775U (en) | A kind of superposition type ultra-low temperature air source heat pump unit | |
| WO2022116133A1 (en) | Wide-range low-temperature refrigeration system for test chamber | |
| CN104633997A (en) | Modularized heat pump | |
| CN111271891A (en) | Crossed overlapping heat pump system | |
| CN214841173U (en) | Hydraulic module of double-four-way valve multi-connected unit | |
| CN104807184A (en) | Two-stage compression heat pump water heater system and work method thereof | |
| CN204612244U (en) | Modular heat pump | |
| CN218583464U (en) | Double-throttling cross type overlapping heat pump system | |
| CN211601183U (en) | Split overlapping type CO2Air source heat pump unit | |
| CN112503788A (en) | Multi-refrigerant loop refrigerating system and air conditioning equipment | |
| CN208671233U (en) | Distributed air conditioner with air-source heat pump | |
| CN112710082A (en) | Ultra-low temperature overlapping formula air source heat pump hot water system | |
| CN203550140U (en) | High-efficiency total heat recovery central air conditioner | |
| CN115388570A (en) | Double-energy-saving-flow crossed cascade heat pump system | |
| CN201138035Y (en) | Large and medium hot-water air conditioner set realizing hot water preparation by energy casecade use | |
| CN101435629B (en) | Screw type cold source hot water machine unit | |
| CN110849032A (en) | Compressor waste heat driven compression-injection refrigerating system | |
| CN111271890A (en) | Cross semi-overlapping power-increasing heat pump system | |
| CN205957531U (en) | Refrigerating system of supplementary water -cooling unit in area | |
| CN214172596U (en) | Multi-refrigerant loop refrigerating system and air conditioning equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200612 |
|
| RJ01 | Rejection of invention patent application after publication |