ATE38555T1 - METHOD AND DEVICE FOR DEFROST CONTROL OF HEAT PUMPS. - Google Patents
METHOD AND DEVICE FOR DEFROST CONTROL OF HEAT PUMPS.Info
- Publication number
- ATE38555T1 ATE38555T1 AT84111031T AT84111031T ATE38555T1 AT E38555 T1 ATE38555 T1 AT E38555T1 AT 84111031 T AT84111031 T AT 84111031T AT 84111031 T AT84111031 T AT 84111031T AT E38555 T1 ATE38555 T1 AT E38555T1
- Authority
- AT
- Austria
- Prior art keywords
- signal
- temperature
- temperature difference
- delta
- supplied
- Prior art date
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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
- F25D21/006—Defroster control with electronic control circuits
Abstract
1. A defrosting control method for heat pumps, a defrosting operation being controlled in dependence upon the temperature difference between the evaporator temperature and the ambient or supply air temperature of the evaporator, the actual temperature difference (DELTA T) being compared with a set-value temperature difference (DELTA Tm ) which varies in dependence upon the ambient or supply air temperature (Tm ), a defrosting signal being delivered on the basis of such comparison when the actual temperature difference exceeds the set-value temperature difference, characterised in that the continuously detected actual value signals of the ambient or supply air temperature (Tm ) and the evaporator temperature (Tk ) are supplied to a subtractor (60) determining the temperature difference DELTA T = Tm -Tk , the actual value signal (Tm ) is also supplied to a function former (62) which forms the set-value temperature difference (DELTA Tm ) from the actual-value signal (Tm ) and an adjusted temperature difference signal (Uv ), the actual-temperature difference signal (DELTA T) output by the subtractor (60) and the set-value temperature difference signal (DELTA Tm ) output by the function former (62) are supplied to a hysteretic comparator (61) which when DELTA T > DELTA Tm produces an output signal transmitted as first instruction signal (54) to a facility (65, 66) for triggering different defrosting signals, the actual value signal (Tm ) is also supplied to a hysteretic comparator (72) and compared therein with a signal (Uk ) corresponding to a fixed temperature above 0 degree C, more particularly 5 degrees C, and an output signal supplied as second instruction signal (56, 57 respectively) to the facility (65, 66) is produced, the actual value signal (Tk ) is supplied to a hysteretic comparator (71) and compared therein with a signal (Uo ) corresponding to a temperature of 0 degree C, and only when (Tk ) is below 0 degree C is an output signal produced which is supplied as third instruction signal (55) to the facility (65, 66) and when the first instruction signal (54) and the third instruction signal (55), the latter signalling a temperature Tk < 0 degree C, are present, the facility (65, 66) : a) if the second instruction signal (56, 57 respectively) signals a temperature Tm < Tuk , triggers a switching process whereby the heat pump drive is stopped and accelerated defrosting with heating gas is started or b) if the second instruction signal (56, 57 respectively) signals a temperature Tm > Tuk triggers a switching process whereby the heat pump drive is stopped and a normal defrosting process started.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19833333907 DE3333907A1 (en) | 1983-09-20 | 1983-09-20 | METHOD AND DEVICE FOR DEFROSTING HEAT PUMPS |
EP84111031A EP0142663B1 (en) | 1983-09-20 | 1984-09-15 | Defrost control method and device for heat pumps |
Publications (1)
Publication Number | Publication Date |
---|---|
ATE38555T1 true ATE38555T1 (en) | 1988-11-15 |
Family
ID=6209559
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT84111031T ATE38555T1 (en) | 1983-09-20 | 1984-09-15 | METHOD AND DEVICE FOR DEFROST CONTROL OF HEAT PUMPS. |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0142663B1 (en) |
AT (1) | ATE38555T1 (en) |
DE (2) | DE3333907A1 (en) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4563877A (en) * | 1984-06-12 | 1986-01-14 | Borg-Warner Corporation | Control system and method for defrosting the outdoor coil of a heat pump |
JPS6192908A (en) * | 1984-10-12 | 1986-05-10 | Diesel Kiki Co Ltd | Air conditioner for vehicle |
US4573326A (en) * | 1985-02-04 | 1986-03-04 | American Standard Inc. | Adaptive defrost control for heat pump system |
DE3539817A1 (en) * | 1985-11-09 | 1987-05-14 | Licentia Gmbh | Method for metrologically determining, displaying and/or evaluating the icing occurring on the cooling plates of an air cooler |
US4835715A (en) * | 1986-12-17 | 1989-05-30 | Carrier Corporation | Outdoor ambient temperature determination |
EP0285690A1 (en) * | 1987-04-08 | 1988-10-12 | Viessmann Werke GmbH & Co. | Process and apparatus for the temperature dependent defrosting of cooling plants according to demand |
US4882908A (en) * | 1987-07-17 | 1989-11-28 | Ranco Incorporated | Demand defrost control method and apparatus |
DE4105880A1 (en) * | 1991-02-25 | 1992-08-27 | Kueba Kaeltetechnik Gmbh | METHOD AND DEVICE FOR OPTIMIZING THE PERFORMANCE AND DEFROSTING OF REFRIGERANT EVAPORATORS |
KR100271974B1 (en) * | 1998-08-31 | 2000-11-15 | 전주범 | De-frost control method |
AU7699000A (en) * | 1999-09-24 | 2001-04-24 | Arcelik A.S. | Defrost control |
US6334321B1 (en) * | 2000-03-15 | 2002-01-01 | Carrier Corporation | Method and system for defrost control on reversible heat pumps |
DE10053422A1 (en) * | 2000-10-27 | 2002-05-08 | Bsh Bosch Siemens Hausgeraete | Refrigeration device with automatic defrost |
DE10223716A1 (en) * | 2002-05-28 | 2003-12-11 | Linde Ag | Process for controlling the defrosting process of an evaporator |
KR20050105029A (en) * | 2004-04-30 | 2005-11-03 | 엘지전자 주식회사 | Defrosting driving method for air conditioner |
EP2366968B1 (en) * | 2010-03-17 | 2017-05-17 | Wolf GmbH | Method and device for thawing an evaporator of a heat pump device |
ES2762238T3 (en) * | 2010-07-01 | 2020-05-22 | Carrier Corp | Defrost on demand with evaporator refrigerant saturation |
EP2717002B1 (en) * | 2012-10-08 | 2019-01-02 | Emerson Climate Technologies GmbH | Method for determining thaw times |
CN111076364A (en) * | 2019-12-25 | 2020-04-28 | 珠海格力电器股份有限公司 | Heat exchanger assembly, air conditioner and air conditioner control method |
DE102020123960B4 (en) | 2020-09-15 | 2023-07-27 | Viessmann Climate Solutions Se | Method for operating a heat pump and heat pump |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3950962A (en) * | 1973-05-01 | 1976-04-20 | Kabushiki Kaisha Saginomiya Seisakusho | System for defrosting in a heat pump |
DE2637129A1 (en) * | 1976-08-18 | 1978-02-23 | Bosch Gmbh Robert | DEVICE FOR DEFROSTING EVAPORATORS IN REFRIGERANT CIRCUITS, IN PARTICULAR OF HEAT PUMPS |
US4215554A (en) * | 1978-05-30 | 1980-08-05 | General Electric Company | Frost control system |
US4338790A (en) * | 1980-02-21 | 1982-07-13 | The Trane Company | Control and method for defrosting a heat pump outdoor heat exchanger |
DE3227604A1 (en) * | 1981-07-29 | 1983-02-24 | Olsberg Gesellschaft für Produktion und Absatz mbH, 5790 Brilon | Automatic defrosting device for heat pump evaporators |
JPS58150736A (en) * | 1982-03-03 | 1983-09-07 | Hitachi Ltd | Control circuit for defrosting |
-
1983
- 1983-09-20 DE DE19833333907 patent/DE3333907A1/en active Granted
-
1984
- 1984-09-15 AT AT84111031T patent/ATE38555T1/en not_active IP Right Cessation
- 1984-09-15 DE DE8484111031T patent/DE3475100D1/en not_active Expired
- 1984-09-15 EP EP84111031A patent/EP0142663B1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
EP0142663A2 (en) | 1985-05-29 |
EP0142663B1 (en) | 1988-11-09 |
DE3333907A1 (en) | 1985-04-04 |
DE3333907C2 (en) | 1988-05-11 |
EP0142663A3 (en) | 1985-07-03 |
DE3475100D1 (en) | 1988-12-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
REN | Ceased due to non-payment of the annual fee |