GB2509483A - Heating water with a heat pump that utilises waste heat from a refrigerator condenser - Google Patents

Heating water with a heat pump that utilises waste heat from a refrigerator condenser Download PDF

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Publication number
GB2509483A
GB2509483A GB1218127.7A GB201218127A GB2509483A GB 2509483 A GB2509483 A GB 2509483A GB 201218127 A GB201218127 A GB 201218127A GB 2509483 A GB2509483 A GB 2509483A
Authority
GB
United Kingdom
Prior art keywords
heat
temperature
water
heat exchanger
refrigerant
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.)
Granted
Application number
GB1218127.7A
Other versions
GB201218127D0 (en
GB2509483B (en
Inventor
Edwin Arthur Gittoes
Stuart Lawson
Christopher John Green
Damian Jacek Fornalski
Piotr Michal Rzyski
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.)
Arctic Circle Ltd
Original Assignee
Arctic Circle Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Arctic Circle Ltd filed Critical Arctic Circle Ltd
Priority to GB1218127.7A priority Critical patent/GB2509483B/en
Publication of GB201218127D0 publication Critical patent/GB201218127D0/en
Publication of GB2509483A publication Critical patent/GB2509483A/en
Application granted granted Critical
Publication of GB2509483B publication Critical patent/GB2509483B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • F24D17/00—Domestic hot-water supply systems
    • F24D17/0005—Domestic hot-water supply systems using recuperation of waste heat
    • 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
    • F24D17/00—Domestic hot-water supply systems
    • F24D17/02—Domestic hot-water supply systems using heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H4/00—Fluid heaters characterised by the use of heat pumps
    • F24H4/02—Water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • 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
    • F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
    • F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
    • 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
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/12—Heat pump
    • F24D2200/123—Compression type heat pumps
    • 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
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/16—Waste heat
    • F24D2200/24—Refrigeration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H4/00—Fluid heaters characterised by the use of heat pumps
    • F24H4/02—Water heaters
    • F24H4/04—Storage heaters
    • 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
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/04—Details of condensers
    • F25B2339/047—Water-cooled condensers
    • 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
    • F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • F25B25/005—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00 using primary and secondary systems
    • 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
    • F25B6/00—Compression machines, plants or systems, with several condenser circuits
    • F25B6/04—Compression machines, plants or systems, with several condenser circuits arranged in series
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/12—Hot water central heating systems using heat pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency

Landscapes

  • 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)
  • Steam Or Hot-Water Central Heating Systems (AREA)

Abstract

A water heating apparatus includes a water system 1 in which water is heated to a desired temperature by a heat pump system 2 and a refrigeration system 3. Refrigerant in the refrigeration system passes through an inlet line 13 to a third heat exchanger 9 and transfers thermal energy to a working fluid of the heat pump system. The working fluid is used to heat water to a pre-heat temperature in a first heat exchanger 7 and to the desired temperature in a second heat exchanger 8. The heated water may then pass along a conduit 5 to a tank for use later. In use, the working fluid arrives at the second heat exchanger in a high pressure, high temperature state and then passes to the first heat exchanger in a high pressure, low grade temperature state. Controllers 10,11,12 are used to control the pre-heated and desired water temperature obtained and the temperature of the working fluid and the refrigerant in the heat pump and refrigeration system. The apparatus preferably includes at least one probe or sensor. The heated water can be used for domestic purposes or in supermarkets to wash food or other areas.

Description

APPARATUS FOR HEATING WATER BY USING HEAT FROM
A REFRIGERATION SYSTEM AND BY PUMPING HEAT TO
A HIGHER TEMPERATURE LEVEL WHILST ALSO
USING LOW GRADE HEAT FROM A HEAT PUMP SYSTEM
This invention relates to apparatus for heating water and, more especially, this invention relates to apparatus for heating water by using heat from a refrigeration system and by pumping heat to a higher temperature level whilst also using low grade heat from a heat pump system.
Refrigeration systems transfer heat. In the interests of efficiency, it is desirable to reclaim this heat. One advantageous area for using the reclaimed heat is that of providing hot water.
It is an aim of the present invention to provide apparatus which is able to heat water using reclaimed heat from a refrigeration system.
Accordingly, in one non-limiting embodiment of the present invention there is provided apparatus for heating water by using heat from a refrigeration system and by pumping heat to a higher temperature level whilst also using low grade heat from a heat pump system, which apparatus comprises: (I) a water flow system in which cold water is heated to a required use temperature; (ii) a heat pump system; (iii) a refrigeration system; (iv) first, second and third heat exchangers; and (v) control means, and which apparatus is such that: (vi) the first heat exchanger pre-heats inlet water for the second heat exchanger, with the heating being effected by water passing through the first heat exchanger and obtaining heat from low temperature grade high pressure refrigerant from the heat pump system, and with the refrigerant in the first heat exchanger being cooled to a first temperature which is above the inlet water temperature; (vii) the second heat exchanger heats the water to a second temperature which is the required use temperature1 with the heating being effected by water passing through the second heat exchanger and obtaining heat from the heat pump system cooling the high pressure high temperature refrigerant, with the refrigerant being cooled to a temperature above the water temperature leaving the first heat exchanger, and with more heat being removed from the refrigerant in the first heat exchanger than is possible using only the second heat exchanger; (viii) the third heat exchanger heats the low pressure refrigerant for the heat pump system, with the heating being effected by the refrigerant passing through the third heat exchanger and obtaining heat from the refrigerant from the refrigeration system, and with the refrigerant in the heat pump system being heated to a temperature below the highest temperature of the refrigerant in the refrigeration system; and (ix) the control means controls (a) the temperature to which the water is heated in the second heat exchanger, (b) the pre-heated water temperature, and (c) the temperature to which the refrigerant is cooled/heated in the heat pump system and the refrigeration system.
The apparatus of the present invention is advantageous in that it is more efficient than ambient air-driven heat pump systems for heating water.
In addition, the apparatus may have a smaller refrigerant charge volume (mass) than a system without reclaiming low grade heat. The apparatus of the present invention may be advantageous in providing heated water for a wide variety of uses including domestic use, and use in supermarkets where the heated water may be used for washing food areas.
The apparatus may include one or more probes, and one or more sensor& An embodiment of the invention will now be described solely by way of example and with reference to the accompanying drawing which shows the various components of apparatus of the present invention.
Referring to the drawing, there is shown apparatus 20 for heating water by using heat from a refrigeration system 3 and by pumping heat to a higher temperature level whilst also using low grade heat from a heat pump system (2), which apparatus 20 comprises: (i) a water flow system 1 in which cold water is heated to a required use temperature; (ii) a heat pump system 2; (iii) a refrigeration system 3; (iv) first, second and third heat exchangers 7, 8, 9; and (v) control means 10, 11, 12, and which apparatus (20) is such that: (vi) the first heat exchanger 7 pre-heats inlet water 4 for the second heat exchanger 8, with the heating being effected by water passing through the first heat exchanger 7 and obtaining heat from low temperature grade high pressure refrigerant from the heat pump system 2, and with the refrigerant in the first heat exchanger 7 being cooled to a first temperature which is above the in let water temperature; (vii) the second heat exchanger 8 heats the water to a second temperature which is the required use temperature, with the heating being effected by water passing through the second heat exchanger B and obtaining heat from the heat pump system 2 cooling the high pressure high temperature refrigerant, with the refrigerant being cooled to a temperature above the water temperature leaving the first heat exchanger 7, and with more heat being removed from the refrigerant in the first heat exchanger 7 than is possible using only the second heat exchanger 8; (viii) the third heat exchanger 9 heats the low pressure refrigerant for the heat pump system 2, with the heating being effected by the refrigerant passing through the third heat exchanger 9 and obtaining heat from the refrigerant from the refrigeration system 3, and with the refrigerant in the heat pump system 2 being heated to a temperature below the highest temperature of the refrigerant in the refrigeration system 3; and (ix) the control means 10, 11, 12 controls (a) the temperature to which the water is heated in the second heat exchanger 8, (b) the pie-heated water temperature, and (c) the temperature to which the refrigerant is cooled/heated in the heat pump system 2 and the refrigeration system 3.
The apparatus 20 is such hot water leaving the second heat exchanger 8 passes along a conduit 5 to the hot water outlet. The control means 10 is connected to the first heat exchanger 7 by a conduit 21, and to the second heat exchanger 8 by a conduit 22. The control means 12 is connected to the second heat exchanger 8 by a conduit 23, and to the third heat exchanger 9 by a conduit 24. The heat pump syátem 2 is also such the first heat exchanger 7 is connected to the third heat exchanger 9 via a conduit 25 and the control means 11. the first heat exchanger 7 is connected to the second heat exchanger 8 by a conduit 6. The refrigeration system 3 includes a discharge inlet line 13 and a discharge outlet line 14.
The apparatus 20 is able to provide heated water via the conduit 5 for domestic use or for other uses such for example as in supermarkets where the heated water may be used to wash food or other areas.
It is to be appreciated that the embodiment of the invention described above with reference to the accompanying drawing has been given by way of example only and that modifications may be effected. Thus, for example, the apparatus 2 may include one or more probes and/or one or more sensors.
The apparatus may include a container such for example as a tank or cylinder for containing the water heated to the required temperature and passing along the conduit 5. The water may be heatçd to any suitable and appropriate temperature, for example 60°C. Individual components shown in the drawings are not limited to use in their drawings and they may be used in other drawings and in all aspects of the invention. The apparatus of the present invention as described above extends to the individual component parts and/or their stated operation in any combination, including omitting stated component parts and/or operational steps.

Claims (3)

  1. SCLAIMSApparatus for heating water by using heat from a refrigeration system and: by pumping heat to a higher temperature level whilst also using low grade heat from a heat pump system, which apparatus comprises: (i) a water flow system in which cold water is heated to a required use temperature; (ii) a heat pump system; (iii) a refrigeration system; (iv) first, second and third heat exchangers; and (v) control means, and which apparatus is such that: (vi) the first heat exchanger pre-heats inlet water for the second heat exchanger, with the heating being effected by water passing through the first heat exchanger and obtaining heat from low temperature grade high pressure refrigerant from the heat pump system, and with the refrigerant in the first heat exchanger being cooled to a first temperature which is above the inlet water temperature; (vii) the second heat exchanger heats the water to a second temperature which is the required use temperature, with the heating being effected by water passing through the second heat exchanger and obtaining heat from the heat pump system cooling the high pressure high temperature refrigerant, with the refrigerant being cooled to a temperature above the water temperature leaving the first heat exchanger, and with more heat being removed from the refrigerant in the first heat exchanger than is possible using only the second heat exchanger; (viii) the third heat exchanger heats the low pressure refrigerant for the: heat pump system, with the heating being effected by the refrigerant passing through the third heat exchanger and obtaining heat from the refrigerant from the refrigeration system, and with the refrigerant in the heat pump system being heated to a temperature below the highest temperature of the refrigerant in the refrigeration system; and (ix) the control means controls (a) the temperature to which the water is heated in the second heat exchanger, (b) the pre-heated water temperature, and (c) the temperature to which the refrigerant is cooled/heated in the heat pump system and the refrigeration system.
  2. 2. Apparatus according to claim I and including at least one probe and/or one sensor.
  3. 3. Apparatus for heating water by using heat from a refrigeration system and by pumping heat to a higher temperature level whilst also using low grade heat from a heat pump system, substantially as herein described with reference to the accompanying drawing.
GB1218127.7A 2012-10-09 2012-10-09 Apparatus for heating water by using heat from a refrigeration system and by pumping heat to a higher temperature level whilst also using low grade heat Expired - Fee Related GB2509483B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1218127.7A GB2509483B (en) 2012-10-09 2012-10-09 Apparatus for heating water by using heat from a refrigeration system and by pumping heat to a higher temperature level whilst also using low grade heat

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1218127.7A GB2509483B (en) 2012-10-09 2012-10-09 Apparatus for heating water by using heat from a refrigeration system and by pumping heat to a higher temperature level whilst also using low grade heat

Publications (3)

Publication Number Publication Date
GB201218127D0 GB201218127D0 (en) 2012-11-21
GB2509483A true GB2509483A (en) 2014-07-09
GB2509483B GB2509483B (en) 2016-05-18

Family

ID=47294545

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GB1218127.7A Expired - Fee Related GB2509483B (en) 2012-10-09 2012-10-09 Apparatus for heating water by using heat from a refrigeration system and by pumping heat to a higher temperature level whilst also using low grade heat

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Country Link
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108278751A (en) * 2017-12-26 2018-07-13 广东申菱环境系统股份有限公司 A kind of energy-saving air conditioning system that sensible heat latent heat double back is received
CN109737611A (en) * 2019-01-09 2019-05-10 青岛海尔空调器有限总公司 A kind of control method of energy resource system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB934114A (en) * 1960-04-17 1963-08-14 Siemens Ag A combined refrigeration and heated-water supply apparatus
US4487032A (en) * 1983-04-01 1984-12-11 Speicher Terry L Energy conservation for household refrigerators and water heaters
JP2000065444A (en) * 1998-08-18 2000-03-03 Maeda Corp Waste heat utilization method for refrigerator and refrigerator
JP2003050050A (en) * 2001-08-03 2003-02-21 Denso Corp Heat pump type hot-water supplier

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5136968B2 (en) * 2011-03-31 2013-02-06 三浦工業株式会社 Steam generation system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB934114A (en) * 1960-04-17 1963-08-14 Siemens Ag A combined refrigeration and heated-water supply apparatus
US4487032A (en) * 1983-04-01 1984-12-11 Speicher Terry L Energy conservation for household refrigerators and water heaters
JP2000065444A (en) * 1998-08-18 2000-03-03 Maeda Corp Waste heat utilization method for refrigerator and refrigerator
JP2003050050A (en) * 2001-08-03 2003-02-21 Denso Corp Heat pump type hot-water supplier

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108278751A (en) * 2017-12-26 2018-07-13 广东申菱环境系统股份有限公司 A kind of energy-saving air conditioning system that sensible heat latent heat double back is received
CN108278751B (en) * 2017-12-26 2021-11-16 广东申菱环境系统股份有限公司 Energy-saving air conditioning system with sensible heat and latent heat double recovery function
CN109737611A (en) * 2019-01-09 2019-05-10 青岛海尔空调器有限总公司 A kind of control method of energy resource system

Also Published As

Publication number Publication date
GB201218127D0 (en) 2012-11-21
GB2509483B (en) 2016-05-18

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20231009