CN111911991A - Low-temperature dual-energy heat pump unit - Google Patents

Low-temperature dual-energy heat pump unit Download PDF

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Publication number
CN111911991A
CN111911991A CN202010878882.7A CN202010878882A CN111911991A CN 111911991 A CN111911991 A CN 111911991A CN 202010878882 A CN202010878882 A CN 202010878882A CN 111911991 A CN111911991 A CN 111911991A
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CN
China
Prior art keywords
water
compressor
communicated
heat pump
temperature sensor
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Pending
Application number
CN202010878882.7A
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Chinese (zh)
Inventor
刘银龙
查明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Hanlong Energy Technology Co ltd
Original Assignee
Zhejiang Hanlong Energy Technology Co ltd
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Filing date
Publication date
Application filed by Zhejiang Hanlong Energy Technology Co ltd filed Critical Zhejiang Hanlong Energy Technology Co ltd
Priority to CN202010878882.7A priority Critical patent/CN111911991A/en
Publication of CN111911991A publication Critical patent/CN111911991A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • 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
    • F24D11/00—Central heating systems using heat accumulated in storage masses
    • F24D11/02—Central heating systems using heat accumulated in storage masses using heat pumps
    • F24D11/0214—Central heating systems using heat accumulated in storage masses using heat pumps water heating system
    • F24D11/0221—Central heating systems using heat accumulated in storage masses using heat pumps water heating system combined with solar energy
    • 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
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1045—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump and solar energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S20/00—Solar heat collectors specially adapted for particular uses or environments
    • F24S20/40—Solar heat collectors combined with other heat sources, e.g. using electrical heating or heat from ambient air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S50/00—Arrangements for controlling solar heat collectors
    • F24S50/40—Arrangements for controlling solar heat collectors responsive to temperature
    • 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
    • F25B30/00—Heat pumps
    • F25B30/06—Heat pumps characterised by the source of low potential heat
    • 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
    • F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
    • 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
    • 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
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/20—Solar thermal
    • 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
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

The invention relates to a heat pump unit. The technical scheme is as follows: a low-temperature dual-energy heat pump unit comprises a compressor, an oil separator, a water-fluorine heat exchanger, an economizer, a filter, a liquid storage tank, an evaporator and a gas-liquid separator, wherein the compressor and the oil separator are sequentially and circularly conducted through pipelines of transmission media; the method is characterized in that: the unit also comprises a PID controller which is respectively and electrically connected with the sensors on the components one by one through a plurality of monitoring lines and is also respectively and electrically connected with the compressor, the four-way valve, the two-way switching pipeline and the three-way pipeline through a plurality of control lines. The heat pump fin evaporator in the unit can not frost, not only can fully ensure the heating requirement, but also can reduce energy consumption, save energy and ensure normal heating.

Description

Low-temperature dual-energy heat pump unit
Technical Field
The invention relates to a heat pump unit, in particular to a low-temperature dual-energy heat pump unit formed by combining a fin evaporator and a solar heat collecting plate.
Background
In a common dual-energy heat pump unit, a solar heat collection evaporator, a heat pump fin evaporator and a compressor are main components. The solar heat-collecting evaporator is mainly composed of solar heat collector and copper tube, in the copper tube a heat-transfer medium is placed, and the compressor connected with copper tube is used for making work, and said heat-transfer medium is compressed into high-temp. high-pressure steam, so that the air in the water storage tank of connected water heater or indoor machine of heating air conditioner can be heated. It is a heating equipment widely used in family, hotel and restaurant. However, when the outdoor temperature is low in winter, the evaporator, especially the heat absorbing fins, is easy to frost, so that the heat efficiency is reduced, and the energy consumption is increased. In the prior defrosting technology, the heat of a medium is introduced by switching a four-way reversing valve to defrost, and a heating rod is arranged beside a condenser to be electrified and heated; the two defrosting technologies still have high energy consumption and low efficiency, and the heat pump cannot be used for completely defrosting below minus 5 ℃, and cannot be used for heating normally in a low-temperature environment.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provide a low-temperature dual-energy heat pump unit, wherein a heat pump fin evaporator in the unit cannot frost, the requirement of heating can be fully ensured, the energy consumption can be reduced, the energy is saved, and the normal heating is ensured.
The technical scheme adopted by the invention for realizing the purpose is as follows:
a low-temperature dual-energy heat pump unit comprises a compressor, an oil separator, a water-fluorine heat exchanger, an economizer, a filter, a liquid storage tank, an evaporator and a gas-liquid separator, wherein the compressor and the oil separator are sequentially and circularly conducted through pipelines of transmission media; the method is characterized in that: the unit also comprises a PID controller which is respectively and electrically connected with the sensors on the components one by one through a plurality of monitoring lines and is also respectively and electrically connected with the compressor, the four-way valve, the two-way switching pipeline and the three-way pipeline through a plurality of control lines; the second output port of the economizer is also communicated with an EVI air supplement port of the compressor through a pipeline of transmission medium.
The water-fluorine heat exchanger is respectively provided with a water circulation outlet and a water circulation inlet so as to output hot water.
The bidirectional switching pipeline comprises a solenoid valve branch and an electronic expansion valve branch which are connected with the water-fluorine heat exchanger and the economizer in parallel through two tee joints; the electromagnetic valve branch is connected with the electromagnetic valve in series and the medium flows to the economizer, and the electronic expansion valve branch is connected with the first electronic expansion valve in series and the medium flows to the direction opposite to the electromagnetic valve branch.
The input port of the three-way pipeline is communicated with the liquid storage tank; two output ports of the three-way pipeline are respectively communicated with the evaporator and the solar heat collecting plate after passing through an electronic expansion valve.
The oil separator is also communicated with an input port of the compressor through an oil return pipe.
The sensors connected with the monitoring lines are as follows: an exhaust temperature sensor and a suction return air temperature sensor on the compressor; a water inlet circulation temperature sensor and a water outlet circulation temperature sensor on the water-fluorine heat exchanger; a fin air inlet temperature sensor and a fin air outlet temperature sensor on the fin type evaporator; the solar heat collecting plate air inlet temperature sensor and the solar heat collecting plate air outlet temperature sensor are arranged on the solar heat collecting plate.
The invention has the outstanding advantages and remarkable effects that:
1. the low-temperature dual-energy heat pump unit provided by the invention has a simple and reliable structure, the intelligent control system can automatically open or close the refrigerant flow matching of the fin evaporator and the solar heat collecting plate according to the real-time temperature control of the PID controller, the working state of the compressor with the best efficiency can be ensured, and the energy-saving effect is obvious.
2. The fin evaporator and the solar heat collecting plate absorb heat of sunlight, air, rainwater, wind and the like through a refrigerant, work is performed through the compressor, the condenser (a water-fluorine heat exchanger) exchanges heat with high thermal efficiency, and COP (coefficient of performance ratio, which is the ratio of energy conversion efficiency) is as high as 1: 6-7W/W.
3. The fin evaporator in the unit can not frost, not only can fully ensure the heating requirement, but also can reduce energy consumption, save energy and ensure normal heating.
Drawings
FIG. 1 is a schematic diagram of the connection relationship of the system of the present invention (for clarity, the temperature sensors and the monitoring lines are omitted).
Detailed Description
The invention will be further described with reference to the following examples, which are illustrated in the accompanying drawings.
The low-temperature dual-core energy heat pump unit shown in the attached drawings comprises the following system pipelines: the system comprises a compressor 3, an oil separator 4, a water-fluorine heat exchanger 5 (also called a high-efficiency tank) communicated with the oil separator through a four-way valve 14, an economizer 6 communicated with the heat exchanger through a two-way switching pipeline, a filter 8 (preferably a two-way drying filter), a liquid storage tank 9, an evaporator 1 (preferably a finned evaporator) communicated with the liquid storage tank through a three-way pipeline, a gas-liquid separator 15 and a solar heat collecting plate 2 communicated between the three-way pipeline and the gas-liquid separator through a pipeline of a transmission medium in sequence; the second output port of the economizer is also communicated with an EVI air supplement port of the compressor through a pipeline of transmission medium.
The bidirectional switching pipeline comprises a solenoid valve branch and an electronic expansion valve branch which are connected with the water-fluorine heat exchanger and the economizer in parallel through two tee joints; the solenoid valve branch is connected with the solenoid valve 13 in series and the medium flows to the economizer, and the electronic expansion valve branch is connected with the first electronic expansion valve 12 in series and the medium flows to the direction opposite to the solenoid valve branch.
The above are all conventional heat pump pipelines.
The improvement of the invention is that: the unit is also provided with a PID controller 16 which is electrically connected with the sensors on the components one by one through a plurality of monitoring lines respectively, thereby providing basic data for system control. The sensors electrically connected with the monitoring lines are as follows: an exhaust temperature sensor and a suction return air temperature sensor on the compressor; a water inlet circulation temperature sensor and a water outlet circulation temperature sensor on the water-fluorine heat exchanger; a fin air inlet temperature sensor and a fin air outlet temperature sensor on the fin type evaporator; the solar heat collecting plate air inlet temperature sensor and the solar heat collecting plate air outlet temperature sensor are arranged on the solar heat collecting plate. In order to make the drawing clear, each temperature sensor and detection line are omitted in the drawing. And is respectively and electrically connected with the compressor, the four-way valve, the two-way switching pipeline and the three-way pipeline through a plurality of control lines (shown by dotted lines in the figure); thus, according to the data provided by each temperature sensor and the preset target data, an operation control command is sent to the related component.
The control end of the electromagnetic valve 13 and the control end of the first electronic expansion valve 12 in the bidirectional switching pipeline are respectively electrically communicated with a PID controller through control lines; the control end of a tee 16 communicated with the water-fluorine heat exchanger is also electrically communicated with the PID controller through a control line; controlled by a PID controller.
Further, a second electronic expansion valve 7 is also installed on the economizer, and the control end of the second electronic expansion valve is electrically communicated with the PID controller through a control line and is also controlled by the PID controller. One end of the second electronic expansion valve is communicated with the first output port of the economizer and is communicated with the input port of the filter, and the other end of the second electronic expansion valve is communicated with the second output port of the economizer and is communicated with the EVI flush port of the compressor through a pipeline of a transmission medium.
The input port of the three-way pipeline is communicated with the liquid storage tank (in the figure, the pipeline communicated with the outlet of the liquid storage tank is firstly bent for a circle on the evaporator and then communicated with the input port of the three-way pipeline, so as to prevent the evaporator from being supercooled and frosted). One of the two output ports of the three-way pipeline is communicated with the evaporator after passing through the second electronic expansion valve 11; the other outlet is communicated with the solar heat collecting plate after passing through a third electronic expansion valve 10. The control end of the second electronic expansion valve 11 and the control end of the third electronic expansion valve 10 are also electrically communicated with the PID controller through control lines, and are also controlled by the PID controller.
The four-way valve is communicated with the water-fluorine heat exchanger and the oil separator (shown in the figure, the control end of the four-way valve is electrically communicated with the PID controller through a control line and is controlled by the PID controller), and an output pipeline of the transmission medium of the evaporator is communicated with the gas-liquid separator 15. The figure shows that: the output port of the three-way joint 17 is connected with a gas-liquid separator; two input ports of the three-way joint are respectively communicated with one outlet of the four-way valve and an output pipeline of the solar heat collecting plate.
The invention utilizes the fin evaporator 1 and the solar heat collector 2 to absorb heat such as solar energy, wind energy, rainwater and the like, and the PID controller is operated and controlled by PID according to parameters such as the temperature of the solar heat collecting plate, the temperature of the heat pump fin evaporator, the ambient temperature, the defrosting temperature, the air suction temperature, the heat pump superheat degree and the like. The controller is externally connected with a power supply, and the compressor 3, each electronic expansion valve, the electromagnetic valve 13 and the four-way valve 14 are all electrically connected with the PID controller 16; temperature sensors arranged on the fin evaporator, the solar thermal collector 2, the high-efficiency heat exchanger 5, the economizer 6 and the like are all electrically connected with a PID controller, and the PID controller controls the operation of the compressor and the electronic expansion valve in real time through a PID technology according to data of each temperature point; a temperature sensor in the water-fluorine heat exchanger 5 senses the temperature of hot water, and a PID controller automatically monitors the operation according to the set water outlet and inlet temperatures in a full-intelligent mode.
If the water heater is used for a heating air conditioner, the structure connection relation is similar to that of the water heater; only the indoor unit of the heating air conditioner is required to replace the water-fluorine heat exchanger.

Claims (6)

1. A low-temperature dual-energy heat pump unit comprises a compressor (3), an oil separator (4), a water-fluorine heat exchanger (5) communicated with the oil separator through a four-way valve (14), an economizer (6) communicated with the heat exchanger through a two-way switching pipeline, a filter (8), a liquid storage tank (9), an evaporator (1) communicated with the liquid storage tank through a three-way pipeline, and a gas-liquid separator (15), wherein the compressor (3), the oil separator (4), the water-fluorine heat exchanger, the economizer, the filter (8), the liquid storage tank, the evaporator (1) and the gas-liquid separator are sequentially in circulating conduction through; the method is characterized in that: the unit also comprises a PID controller (16), wherein the PID controller is respectively and electrically connected with the sensors on the components one by one through a plurality of monitoring lines and is also respectively and electrically connected with the compressor, the four-way valve, the two-way switching pipeline and the three-way pipeline through a plurality of control lines; the second output port of the economizer is also communicated with an EVI air supplement port of the compressor through a pipeline of transmission medium.
2. The low-temperature dual-energy heat pump unit according to claim 1, wherein: the water-fluorine heat exchanger is respectively provided with a water circulation outlet and a water circulation inlet so as to output hot water.
3. The low-temperature dual-energy heat pump unit according to claim 2, wherein: the bidirectional switching pipeline comprises a solenoid valve branch and an electronic expansion valve branch which are connected with the water-fluorine heat exchanger and the economizer in parallel through two tee joints; the solenoid valve branch is connected with a solenoid valve (13) in series and the medium flows to the economizer, and the electronic expansion valve branch is connected with a first electronic expansion valve (12) in series and the medium flows to the direction opposite to that of the solenoid valve branch.
4. The low-temperature dual-energy heat pump unit according to claim 3, wherein: the input port of the three-way pipeline is communicated with the liquid storage tank; two output ports of the three-way pipeline are respectively communicated with the evaporator and the solar heat collecting plate after passing through an electronic expansion valve.
5. The low-temperature dual-energy heat pump unit according to claim 4, wherein: the oil separator is also communicated with an input port of the compressor through an oil return pipe.
6. The low-temperature dual-energy heat pump unit according to claim 5, wherein: the sensors connected with the monitoring lines are as follows: an exhaust temperature sensor and a suction return air temperature sensor on the compressor; a water inlet circulation temperature sensor and a water outlet circulation temperature sensor on the water-fluorine heat exchanger; a fin air inlet temperature sensor and a fin air outlet temperature sensor on the fin type evaporator; the solar heat collecting plate air inlet temperature sensor and the solar heat collecting plate air outlet temperature sensor are arranged on the solar heat collecting plate.
CN202010878882.7A 2020-08-27 2020-08-27 Low-temperature dual-energy heat pump unit Pending CN111911991A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010878882.7A CN111911991A (en) 2020-08-27 2020-08-27 Low-temperature dual-energy heat pump unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010878882.7A CN111911991A (en) 2020-08-27 2020-08-27 Low-temperature dual-energy heat pump unit

Publications (1)

Publication Number Publication Date
CN111911991A true CN111911991A (en) 2020-11-10

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Application Number Title Priority Date Filing Date
CN202010878882.7A Pending CN111911991A (en) 2020-08-27 2020-08-27 Low-temperature dual-energy heat pump unit

Country Status (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113551441A (en) * 2021-08-02 2021-10-26 姜春辉 Heat pump set

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113551441A (en) * 2021-08-02 2021-10-26 姜春辉 Heat pump set

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