CA2754201A1 - Defrost system and method for heat pumps - Google Patents
Defrost system and method for heat pumps Download PDFInfo
- Publication number
- CA2754201A1 CA2754201A1 CA2754201A CA2754201A CA2754201A1 CA 2754201 A1 CA2754201 A1 CA 2754201A1 CA 2754201 A CA2754201 A CA 2754201A CA 2754201 A CA2754201 A CA 2754201A CA 2754201 A1 CA2754201 A1 CA 2754201A1
- Authority
- CA
- Canada
- Prior art keywords
- defrost
- outdoor coil
- compressor
- coil
- conduit
- 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.)
- Abandoned
Links
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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
-
- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/02—Detecting the presence of frost or condensate
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/01—Heaters
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)
- Air Conditioning Control Device (AREA)
- Defrosting Systems (AREA)
Abstract
A system and method for defrosting an air source heat pump are presented. A
defrost conduit extends from the discharge from a system compressor to the outdoor coil. The defrost conduit includes a normally closed defrost valve. When the need for defrost exists, the defrost valve is opened, and warm refrigerant is delivered from the compressor discharge to the outdoor coil to effect defrost of the outdoor coil.
defrost conduit extends from the discharge from a system compressor to the outdoor coil. The defrost conduit includes a normally closed defrost valve. When the need for defrost exists, the defrost valve is opened, and warm refrigerant is delivered from the compressor discharge to the outdoor coil to effect defrost of the outdoor coil.
Claims (21)
1. A heat pump system including:
at least one compressor;
an indoor coil for delivering heat energy to an indoor space to be heated;
an outdoor coil for extracting heat energy from outside air to be used to heat the indoor space;
a conduit system connected between said one compressor and said indoor and outdoor coils for circulating refrigerant from said one compressor to said indoor coil and said outdoor coil and from said outdoor coil back to said one compressor;
a defrost conduit connected between said one compressor and said outdoor coil;
and a defrost flow control valve in said defrost conduit, said defrost control valve being normally closed, and said defrost control valve being opened to deliver refrigerant through said defrost conduit from said one compressor to said outdoor coil to defrost said outdoor coil.
at least one compressor;
an indoor coil for delivering heat energy to an indoor space to be heated;
an outdoor coil for extracting heat energy from outside air to be used to heat the indoor space;
a conduit system connected between said one compressor and said indoor and outdoor coils for circulating refrigerant from said one compressor to said indoor coil and said outdoor coil and from said outdoor coil back to said one compressor;
a defrost conduit connected between said one compressor and said outdoor coil;
and a defrost flow control valve in said defrost conduit, said defrost control valve being normally closed, and said defrost control valve being opened to deliver refrigerant through said defrost conduit from said one compressor to said outdoor coil to defrost said outdoor coil.
2. A heat pump system as in claim 1, further comprising:
a detector in said outdoor coil, said detector detecting accumulation of ice on said outdoor coil and generating a defrost signal calling for defrost operation;
a controller, said controller receiving said defrost signal from said detector and generating a signal to open said defrost valve to initiate defrost operation.
a detector in said outdoor coil, said detector detecting accumulation of ice on said outdoor coil and generating a defrost signal calling for defrost operation;
a controller, said controller receiving said defrost signal from said detector and generating a signal to open said defrost valve to initiate defrost operation.
3. A heat pump system as in claim 2 wherein said detector comprises:
a light emitting diode;
a phototransistor positioned to receive light from said light emitting diode and generating said defrost signal to said controller as a function of intensity of light from said light emitting diode sensed by said phototransistor.
a light emitting diode;
a phototransistor positioned to receive light from said light emitting diode and generating said defrost signal to said controller as a function of intensity of light from said light emitting diode sensed by said phototransistor.
4. A heat pump system as in claim 1 wherein;
said defrost flow control valve is a combination back pressure and on-off flow control valve.
said defrost flow control valve is a combination back pressure and on-off flow control valve.
5. A heat pump system as in claim 4 wherein;
said defrost flow control valve prevents discharge pressure from said one compressor from dropping below a predetermined equivalent temperature level.
said defrost flow control valve prevents discharge pressure from said one compressor from dropping below a predetermined equivalent temperature level.
6. A heat pump system as in claim 1, further comprising:
said defrost conduit is connected to deliver refrigerant to a bottom of said outdoor coil during defrost operation to defrost said outdoor coil from the bottom toward a top thereof.
said defrost conduit is connected to deliver refrigerant to a bottom of said outdoor coil during defrost operation to defrost said outdoor coil from the bottom toward a top thereof.
7. A heat pump system as in claim 1, further comprising:
an accumulator connected in said conduit system between said outdoor coil and said one compressor; and a heating element in said accumulator, said heating element being activated during defrost operation to increase heat energy of said refrigerant delivered to said outdoor coil to defrost said outdoor coil.
an accumulator connected in said conduit system between said outdoor coil and said one compressor; and a heating element in said accumulator, said heating element being activated during defrost operation to increase heat energy of said refrigerant delivered to said outdoor coil to defrost said outdoor coil.
8. A heat pump system comprising:
at least one compressor;
an outdoor coil for extracting heat energy from outside air to be used to heat an indoor space;
an indoor coil for delivering heat energy to an indoor space to be heated;
a conduit system for circulating refrigerant fluid from said one compressor to said indoor coil and said outdoor coil and back to said one compressor;
a 4 way valve in said conduit system for reversing flow of refrigerant in said conduit system to change a mode of operation of the heat pump system from heating operation to cooling operation;
a defrost conduit connected between said one compressor and said outdoor coil;
and a defrost flow control valve in said defrost conduit, said defrost control valve being normally closed, and said defrost control valve being opened to deliver refrigerant through said defrost conduit from said one compressor to said outdoor coil to defrost said outdoor coil.
at least one compressor;
an outdoor coil for extracting heat energy from outside air to be used to heat an indoor space;
an indoor coil for delivering heat energy to an indoor space to be heated;
a conduit system for circulating refrigerant fluid from said one compressor to said indoor coil and said outdoor coil and back to said one compressor;
a 4 way valve in said conduit system for reversing flow of refrigerant in said conduit system to change a mode of operation of the heat pump system from heating operation to cooling operation;
a defrost conduit connected between said one compressor and said outdoor coil;
and a defrost flow control valve in said defrost conduit, said defrost control valve being normally closed, and said defrost control valve being opened to deliver refrigerant through said defrost conduit from said one compressor to said outdoor coil to defrost said outdoor coil.
9. The heat pump system as in claim 8 wherein;
10 refrigerant is delivered to said outdoor coil to effect defrost operation without operation of said 4 way valve.
10. A heat pump system as in claim 8, further comprising:
a detector in said outdoor coil, said detector detecting accumulation of ice on said outdoor coil and generating a defrost signal calling for defrost operation;
a controller, said controller receiving said defrost signal from said detector and generating a signal to open said defrost valve to initiate defrost operation.
10. A heat pump system as in claim 8, further comprising:
a detector in said outdoor coil, said detector detecting accumulation of ice on said outdoor coil and generating a defrost signal calling for defrost operation;
a controller, said controller receiving said defrost signal from said detector and generating a signal to open said defrost valve to initiate defrost operation.
11. A heat pump system as in claim 10 wherein said detector comprises:
a light emitting diode;
a phototransistor positioned to receive light from said light emitting diode and generating said defrost signal to said controller as a function of intensity of light from said light emitting diode sensed by said phototransistor.
a light emitting diode;
a phototransistor positioned to receive light from said light emitting diode and generating said defrost signal to said controller as a function of intensity of light from said light emitting diode sensed by said phototransistor.
12. A heat pump system as in claim 8 wherein;
said defrost flow control valve is a combination back pressure and on-off flow control valve.
said defrost flow control valve is a combination back pressure and on-off flow control valve.
13. A heat pump system as in claim 12 wherein;
said defrost flow control valve prevents discharge pressure from said one compressor from dropping below a predetermined equivalent temperature level.
said defrost flow control valve prevents discharge pressure from said one compressor from dropping below a predetermined equivalent temperature level.
14. A heat pump system as in claim 8 wherein:
said defrost conduit is connected to deliver refrigerant to a bottom of said outdoor coil during defrost operation to defrost said outdoor coil from the bottom toward a top thereof.
said defrost conduit is connected to deliver refrigerant to a bottom of said outdoor coil during defrost operation to defrost said outdoor coil from the bottom toward a top thereof.
15. A heat pump system as in claim 8, further comprising:
an accumulator connected in said conduit system between said outdoor coil and said one compressor; and a heating element in said accumulator, said heating element being activated during defrost operation to increase heat energy of said refrigerant delivered to said outdoor coil to defrost said outdoor coil.
an accumulator connected in said conduit system between said outdoor coil and said one compressor; and a heating element in said accumulator, said heating element being activated during defrost operation to increase heat energy of said refrigerant delivered to said outdoor coil to defrost said outdoor coil.
16. The method of effecting defrost operation in a heat pump system, comprising:
operating at least one compressor to circulate a refrigerant to a first coil to deliver heat energy to an interior space to be heated, and to a second coil to extract heat energy from outside air;
connecting a defrost conduit between said one compressor and said outdoor coil;
positioning a defrost flow control valve in said defrost conduit, said defrost control valve being normally closed; and opening said defrost control valve to deliver refrigerant through said defrost conduit from said one compressor to said outdoor coil to defrost said outdoor coil.
operating at least one compressor to circulate a refrigerant to a first coil to deliver heat energy to an interior space to be heated, and to a second coil to extract heat energy from outside air;
connecting a defrost conduit between said one compressor and said outdoor coil;
positioning a defrost flow control valve in said defrost conduit, said defrost control valve being normally closed; and opening said defrost control valve to deliver refrigerant through said defrost conduit from said one compressor to said outdoor coil to defrost said outdoor coil.
17. The method of effecting defrost operation as in claim 16, further comprising:
positioning a detector in said outdoor coil to detect accumulation of ice on said outdoor coil and generate a signal calling for defrost operation;
delivering said defrost signal to a controller, said controller receiving said defrost signal from said detector and generating a defrost signal to open said defrost valve to initiate defrost operation.
positioning a detector in said outdoor coil to detect accumulation of ice on said outdoor coil and generate a signal calling for defrost operation;
delivering said defrost signal to a controller, said controller receiving said defrost signal from said detector and generating a defrost signal to open said defrost valve to initiate defrost operation.
18. The method of effecting defrost operation as in claim 17 wherein the positioning a detector in said outside coil comprises:
positioning a light emitting diode in said outdoor coil; and positioning a phototransistor in said outdoor coil to receive light from said light emitting diode and generating said defrost signal to said controller as a function of intensity of light from said light emitting diode sensed by said phototransistor.
positioning a light emitting diode in said outdoor coil; and positioning a phototransistor in said outdoor coil to receive light from said light emitting diode and generating said defrost signal to said controller as a function of intensity of light from said light emitting diode sensed by said phototransistor.
19. The method of effecting defrost operation as in claim 16, further comprising:
connecting said defrost conduit to deliver refrigerant to a bottom of said outdoor coil during defrost operation to defrost said outdoor coil from the bottom toward a top thereof.
connecting said defrost conduit to deliver refrigerant to a bottom of said outdoor coil during defrost operation to defrost said outdoor coil from the bottom toward a top thereof.
20. The method of effecting defrost operation as in claim 16 wherein;
said defrost flow control valve is a combination back pressure and on-off flow control valve to prevent discharge pressure from said one compressor from dropping below a predetermined equivalent temperature level.
said defrost flow control valve is a combination back pressure and on-off flow control valve to prevent discharge pressure from said one compressor from dropping below a predetermined equivalent temperature level.
21. The method of effecting defrost operation as in claim 16, further comprising:
positioning a heating element between said outdoor coil and said one compressor; and activating said heating element during defrost operation to increase heat energy delivered to said outdoor coil to defrost said outdoor coil.
positioning a heating element between said outdoor coil and said one compressor; and activating said heating element during defrost operation to increase heat energy delivered to said outdoor coil to defrost said outdoor coil.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/401,136 | 2009-03-10 | ||
| US12/401,136 US20100229575A1 (en) | 2009-03-10 | 2009-03-10 | Defrost system and method for heat pumps |
| PCT/US2010/026318 WO2010104757A2 (en) | 2009-03-10 | 2010-03-05 | Defrost system and method for heat pumps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2754201A1 true CA2754201A1 (en) | 2010-09-16 |
Family
ID=42729027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2754201A Abandoned CA2754201A1 (en) | 2009-03-10 | 2010-03-05 | Defrost system and method for heat pumps |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20100229575A1 (en) |
| EP (1) | EP2406563A2 (en) |
| CA (1) | CA2754201A1 (en) |
| WO (1) | WO2010104757A2 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9328953B2 (en) | 2010-02-23 | 2016-05-03 | Lg Electronics Inc. | Refrigerator and controlling method thereof |
| US10274210B2 (en) | 2010-08-27 | 2019-04-30 | Nortek Air Solutions Canada, Inc. | Heat pump humidifier and dehumidifier system and method |
| KR101712213B1 (en) * | 2011-04-22 | 2017-03-03 | 엘지전자 주식회사 | Multi type air conditiner and method of controlling the same |
| CN102226608B (en) * | 2011-04-27 | 2013-03-27 | 海尔集团公司 | Air conditioner defrosting system, air conditioner and air conditioner defrosting method |
| ITBS20110084A1 (en) * | 2011-06-10 | 2012-12-11 | Bmb Di Begarelli Bruno & C Sas | DEFROSTING SYSTEM OF A REINFORCED HEAT PUMP MACHINE THROUGH REUSE OF HEAT PRODUCED BY THE SAME MACHINE |
| WO2013114384A1 (en) * | 2011-12-26 | 2013-08-08 | Robert Bosch Engineering And Business Solutions Limited | An accumulator for a refrigerant recovery and recharge device |
| US10041721B2 (en) * | 2012-11-30 | 2018-08-07 | Lennox Industries Inc. | Heat pump comprising primary defrost operation and secondary defrost operation and method of operating heat pump |
| US9772124B2 (en) | 2013-03-13 | 2017-09-26 | Nortek Air Solutions Canada, Inc. | Heat pump defrosting system and method |
| JP6688555B2 (en) * | 2013-11-25 | 2020-04-28 | 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． | Air conditioner |
| US10391835B2 (en) * | 2015-05-15 | 2019-08-27 | Ford Global Technologies, Llc | System and method for de-icing a heat pump |
| US9857975B2 (en) | 2015-06-26 | 2018-01-02 | International Business Machines Corporation | Non-volatile memory drive partitions within microcontrollers |
| GB2546545A (en) * | 2016-01-21 | 2017-07-26 | Pollock Geoffrey | The planet saver |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2058590A (en) * | 1934-07-10 | 1936-10-27 | John A Jefferson | Combination shut-off and check valve |
| US2523826A (en) * | 1944-10-21 | 1950-09-26 | Hubbell Corp | Back pressure regulator valve |
| JPH0686969B2 (en) * | 1984-12-07 | 1994-11-02 | 株式会社日立製作所 | Air-cooled heat pump type refrigeration cycle |
| KR0152286B1 (en) * | 1992-10-22 | 1998-11-02 | 윤종용 | Cooling/heating airconditioner and its control method |
| JPH06331202A (en) * | 1993-05-21 | 1994-11-29 | Mitsubishi Heavy Ind Ltd | Heat pump type air conditioner |
| US5551255A (en) * | 1994-09-27 | 1996-09-03 | The United States Of America As Represented By The Secretary Of Commerce | Accumulator distillation insert for zeotropic refrigerant mixtures |
| JP2001108256A (en) * | 1999-10-07 | 2001-04-20 | Daikin Ind Ltd | Hot water supplying device |
| EP1403598B1 (en) * | 2001-07-02 | 2008-12-24 | Sanyo Electric Co., Ltd. | Heat pump |
| US6467284B1 (en) * | 2001-09-17 | 2002-10-22 | Ut-Battelle, Llc | Frostless heat pump having thermal expansion valves |
| US7004246B2 (en) * | 2002-06-26 | 2006-02-28 | York International Corporation | Air-to-air heat pump defrost bypass loop |
| KR100499485B1 (en) * | 2002-11-23 | 2005-07-07 | 엘지전자 주식회사 | accumulator of heat pump system with at least two compressors |
| US7312713B2 (en) * | 2004-12-17 | 2007-12-25 | Research Foundation Of The City University Of New York | Methods and systems for detection of ice formation on surfaces |
| KR100788302B1 (en) * | 2006-04-13 | 2007-12-27 | 주식회사 코벡엔지니어링 | High speed defrosting heat pump |
-
2009
- 2009-03-10 US US12/401,136 patent/US20100229575A1/en not_active Abandoned
-
2010
- 2010-03-05 CA CA2754201A patent/CA2754201A1/en not_active Abandoned
- 2010-03-05 WO PCT/US2010/026318 patent/WO2010104757A2/en active Application Filing
- 2010-03-05 EP EP10751214A patent/EP2406563A2/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| EP2406563A2 (en) | 2012-01-18 |
| WO2010104757A3 (en) | 2011-01-06 |
| US20100229575A1 (en) | 2010-09-16 |
| WO2010104757A2 (en) | 2010-09-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |
Effective date: 20140305 |