EP0063178B1 - Procédé pour le fonctionnement d'une pompe à chaleur - Google Patents

Procédé pour le fonctionnement d'une pompe à chaleur Download PDF

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Publication number
EP0063178B1
EP0063178B1 EP81109274A EP81109274A EP0063178B1 EP 0063178 B1 EP0063178 B1 EP 0063178B1 EP 81109274 A EP81109274 A EP 81109274A EP 81109274 A EP81109274 A EP 81109274A EP 0063178 B1 EP0063178 B1 EP 0063178B1
Authority
EP
European Patent Office
Prior art keywords
defrosting process
useful operation
value
state variable
timing
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.)
Expired
Application number
EP81109274A
Other languages
German (de)
English (en)
Other versions
EP0063178A1 (fr
Inventor
Franz Georg Dr. Gärtner
Hans-Ulrich Schweer
Dieter Kühl
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.)
Kkw Kulmbacher Klimagerate-Werk GmbH
Original Assignee
Kkw Kulmbacher Klimagerate-Werk GmbH
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.)
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Publication date
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Application filed by Kkw Kulmbacher Klimagerate-Werk GmbH filed Critical Kkw Kulmbacher Klimagerate-Werk GmbH
Priority to AT81109274T priority Critical patent/ATE11819T1/de
Publication of EP0063178A1 publication Critical patent/EP0063178A1/fr
Application granted granted Critical
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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
    • 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

Definitions

  • the invention relates to a method for operating a refrigerator according to the first part of claim 1.
  • a method of the type mentioned in the first part of claim 1 is already known.
  • the actual time of the defrosting is monitored and compared with a predetermined period of time.
  • the useful operating time between two defrosting operations is extended if the determined defrosting time was shorter than the predetermined period and is shortened if the determined defrosting time was longer than the predetermined period.
  • the times of the de-icing of the evaporator are not limited to the absolutely necessary extent in favor of the useful operation of the cooling circuit or the heat pump (DE-A 2 945 691).
  • a method for operating a heat pump is also known, in which the running time of the heat pump is summed at outside temperatures at which the evaporator can freeze (usually between + 5 ° C. and -5 ° C.). After reaching a predetermined time, the useful operation, that is to say the heating operation of the heat pump, is stopped and the evaporator is de-iced within a period of time, for example within half an hour, by reversing the refrigerant circuit. After the time of defrosting, heating operation is resumed and the running time is summed up again and so on. The defrosting operations are carried out depending on the outside temperature regardless of whether the evaporator is iced up or not. This mode of operation reduces the annual performance factor of the heat pump, since the heating operation is temporarily stopped even when there is no icing and useful heat could be obtained.
  • the object of the invention is to further refine and improve the method of the type for heat pump mentioned in the first part of claim 1.
  • a refrigerator is operated as a heat pump.
  • the heating mode i.e. the useful mode of the heat pump and the defrosting of its evaporator, are time-dependent and depend on the instantaneous value of a state variable of the refrigerant in the evaporator of the heat pump.
  • Either the evaporation pressure or the evaporation temperature can be used as a state variable. It is also possible to use the outside temperature as a state variable.
  • the instantaneous values of the selected state variable are not shown in the drawing. However, it is assumed that the instantaneous values of the selected state variable decrease with increasing degree of icing of the evaporator and vice versa.
  • the heat supply to the refrigerant and thus the evaporation temperature and the evaporation pressure are reduced with increasing icing.
  • the heat supply to the refrigerant increases, whereupon the evaporation temperature and the evaporation pressure rise.
  • the heat pump is switched from use mode to de-icing at the point marked with 1 in the time diagram and a first timing t is started.
  • the deicing can be done in any way, for example by sprinkling the evaporator with a brine or by reversing the refrigerant circuit or otherwise.
  • the heat pump is switched from defrosting to heating mode at position 2 of the time schedule. Furthermore, the first timekeeping ends and the result of the timekeeping is recorded.
  • an upper value for example + 20 ° C evaporation temperature
  • Heating continues to run if, after a defined basic time t G , for example 60 minutes, the state variable is still above the lower limit.
  • the correction value K w becomes positive.
  • the useful operating time following after the last defrosting time becomes longer than the basic time t G.

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)
  • Defrosting Systems (AREA)
  • Air Conditioning Control Device (AREA)

Claims (2)

1. Procédé pour faire fonctionner une machine frigorifique, dans laquelle la durée d'un fonctionnement utile, conforme aux prescriptions, provoquant un givrage de son évaporateur, est fixée par la durée d'un processus de dégivrage précédant le fonctionnement utile et d'un processus de dégivrage venant à la suite de ce fonctionnement utile, caractérisé par la combinaison des caractéristiques:
1.1 On fait fonctionner la machine frigorifique en pompe à chaleur,
1.2 On ne fait commencer un processus de dégivrage que si la valeur instantanée de l'une des variables d'état de l'agent frigorifique, la pression ou la température, devient inférieure à une valeur limite inférieure,
1.3 Lorsque la valeur limite inférieure de la variable d'état est atteinte, on interrompt le fonctionnement utile, on fait commencer un processus de de dégivrage et on fait débuter un premier chronométrage (t),
1.4 Dès que, pendant le dégivrage, la grandeur d'état a augmenté jusqu'à une valeur supérieure, on met fin au processus de dégivrage et on branche la machine frigorifique sur le fonctionnement utile et l'on met fin au premier chronométrage en en conservant le résultat,
1.5 On poursuit le fonctionnement utile si, après une durée de base (tc) fixée, la variable d'état est encore inférieure à la valeur limite inférieure,
1.6 On interrompt à nouveau le fonctionnement utile et on fait commencer un processus de dégivrage si, après que la durée de base (tG) se soit écoulée, la valeur instantanée de la variable d'état est égale ou inférieure à la valeur limite inférieure, et en outre, on fait débuter un second chronométrage (t) au début du processus de dégivrage qui suit le fonctionnement utile,
1.7 A la fin, qui se produit dès qui la valeur limite supérieure est atteinte, du processus de dégivrage effectué en dernier, on met aussi fin au second chronométrage (t) et on en conserve le résultat.
1.8 On détermine toutes les durées de fonctionnement suivantes, respectivement par la durée de base (tG) et par une valeur de correction (Kw) ajoutée à cette durée de base et formée à partir d'une constante (k) servant de facteur de correction et de l'avant-dernière valeur chronométrée qui a été conservée et dont on a soustrait la dernière valeur chronométrée qui a été conservée.
2. Procédé suivant la revendication 1, caractérise en ce qu'on choisit comme variable d'état pour le commencement du dégivrage, la température extérieure au lieu de la variable d'état choisie de l'agent frigorigène dans l'évaporateur de la pompe à chaleur.
EP81109274A 1981-04-16 1981-10-29 Procédé pour le fonctionnement d'une pompe à chaleur Expired EP0063178B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81109274T ATE11819T1 (de) 1981-04-16 1981-10-29 Verfahren zum betreiben einer waermepumpe.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3115599 1981-04-16
DE3115599A DE3115599C2 (de) 1981-04-16 1981-04-16 Abtausteuerung für eine Wärmepumpe

Publications (2)

Publication Number Publication Date
EP0063178A1 EP0063178A1 (fr) 1982-10-27
EP0063178B1 true EP0063178B1 (fr) 1985-02-13

Family

ID=6130369

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81109274A Expired EP0063178B1 (fr) 1981-04-16 1981-10-29 Procédé pour le fonctionnement d'une pompe à chaleur

Country Status (4)

Country Link
EP (1) EP0063178B1 (fr)
JP (1) JPS57179526A (fr)
AT (1) ATE11819T1 (fr)
DE (1) DE3115599C2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3235642A1 (de) * 1982-09-25 1984-03-29 3 E Elektronik-Elektro-Energieanlagen Baugesellschaft mbH, 5500 Trier Einrichtung zur elektrischen abtauregelung fuer den verdampfer einer kaelteanlage
DE3238354A1 (de) * 1982-10-15 1984-04-19 Siemens AG, 1000 Berlin und 8000 München Verfahren zum abtauen des verdampfers einer beispielsweise als waermepumpe betriebenen kaeltemaschine
US4573326A (en) * 1985-02-04 1986-03-04 American Standard Inc. Adaptive defrost control for heat pump system
GB2183320B (en) * 1985-11-08 1990-07-11 Ewald Gossler Method and device for compression of gases
GB8702722D0 (en) * 1987-02-06 1987-03-11 York Int Ltd Defrosting of heat exchangers
JPH0539835U (ja) * 1991-03-25 1993-05-28 ジエイ スー ピー 永久磁性吸盤新型結構
US5440893A (en) * 1994-02-28 1995-08-15 Maytag Corporation Adaptive defrost control system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS553348Y2 (fr) * 1974-11-06 1980-01-26
JPS5460753U (fr) * 1977-10-06 1979-04-26
US4156350A (en) * 1977-12-27 1979-05-29 General Electric Company Refrigeration apparatus demand defrost control system and method
US4173871A (en) * 1977-12-27 1979-11-13 General Electric Company Refrigeration apparatus demand defrost control system and method
US4251988A (en) * 1978-12-08 1981-02-24 Amf Incorporated Defrosting system using actual defrosting time as a controlling parameter
US4680940A (en) * 1979-06-20 1987-07-21 Vaughn Eldon D Adaptive defrost control and method
DE3022571C2 (de) * 1980-06-16 1983-10-20 KKW Kulmbacher Klimageräte-Werk GmbH, 8650 Kulmbach Verfahren zum Betreiben einer Wärmepumpe

Also Published As

Publication number Publication date
ATE11819T1 (de) 1985-02-15
DE3115599C2 (de) 1986-07-10
JPS6334375B2 (fr) 1988-07-11
EP0063178A1 (fr) 1982-10-27
DE3115599A1 (de) 1982-11-04
JPS57179526A (en) 1982-11-05

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