EP0285690A1 - Procédé et dispositif pour le dégivrage selon besoin dépendant de la température des installations frigorifiques - Google Patents

Procédé et dispositif pour le dégivrage selon besoin dépendant de la température des installations frigorifiques Download PDF

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Publication number
EP0285690A1
EP0285690A1 EP87105194A EP87105194A EP0285690A1 EP 0285690 A1 EP0285690 A1 EP 0285690A1 EP 87105194 A EP87105194 A EP 87105194A EP 87105194 A EP87105194 A EP 87105194A EP 0285690 A1 EP0285690 A1 EP 0285690A1
Authority
EP
European Patent Office
Prior art keywords
temperature
predetermined
difference
evaporator
value
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.)
Withdrawn
Application number
EP87105194A
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German (de)
English (en)
Inventor
Hans Dr. Viessmann
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.)
Viessmann Werke GmbH and Co KG
Original Assignee
Viessmann Werke GmbH and Co KG
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 Viessmann Werke GmbH and Co KG filed Critical Viessmann Werke GmbH and Co KG
Priority to EP87105194A priority Critical patent/EP0285690A1/fr
Publication of EP0285690A1 publication Critical patent/EP0285690A1/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • 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

Definitions

  • the invention relates to a method and an apparatus for temperature-dependent defrosting of cooling systems.
  • defrosting is necessary as the evaporator becomes more iced up.
  • - Manual introduction for example by switching off the compressor and the fans on the condenser and evaporator
  • - Time-dependent initiation eg every 24 hours
  • - Initiation depending on the degree of icing of the evaporator in which an icing sensor attached to it determines the degree of icing and initiates the defrosting process when a predetermined degree of icing is reached
  • - Temperature-dependent introduction which takes place depending on a temperature measurement on the evaporator.
  • Methods and devices for temperature-dependent defrosting which measure a temperature at the evaporator and compare it with a fixed reference value. If the measured temperature value has reached or exceeds the reference value, the defrosting process is initiated.
  • a disadvantage of this known solution is that the defrost is triggered even when the evaporator is briefly frosted. This condition can also occur when the door to the cold store is opened or when the cold store is filled with moist, fresh goods.
  • the object of the invention is to enable a method and a device which allow a reliably operating temperature-dependent defrosting of cooling systems using two temperature sensors and which only initiate the defrosting process if a given temperature condition exists in the cooling system for a certain time.
  • the predetermined difference value is approximately 10 K to 15 K.
  • the predetermined growth amount can advantageously be adjustable and is preferably 5K.
  • the predetermined time period during which the determined temperature difference between the first and second actual temperature must be equal to or greater than the predetermined difference value can advantageously be set and is preferably 4 1/2 minutes.
  • the defrosting process is also advantageously temperature-dependent when the temperature in the air flow at the inlet of the evaporator exceeds 5 ° C.
  • Fig. 1 shows an example of the diagram of a refrigeration cycle in which the invention is applicable.
  • a main circuit I which is composed of a pressure line 9, a liquid line 10 and a suction line II, flowing coolant is evaporated by an evaporator 5, compressed by a compressor 1, liquefied by a condenser 2 and dried in a combination dryer 3.
  • An E-valve 4 and a pressostat 13 also act on the main cooling circuit I.
  • a hot gas bypass line 12 is also shown, through which 6 hot gas flows for the defrosting process after opening a solenoid valve. The hot gas then flows through the bypass line, heats an evaporator dish 7 and then flows through the evaporator 5, the suction line 11 and part of the pressure line 9, as a result of which the evaporator is heated and thus defrosted.
  • a first temperature sensor 14 is arranged in the air flow at the inlet of the evaporator 5 and measures the temperature T V at this point. (The temperatures are given below in Kelvin, with the exception of the comparison temperature T V ⁇ for the end of the defrost.).
  • a second temperature sensor 15 which is called defrosting sensor in the following, is provided at the coolant outlet of the evaporator 5 or at the inlet of the suction line and measures the temperature T 1 there.
  • ⁇ T A of approx. 5 between the temperature T V measured by the first temperature sensor 14 in the air flow at the inlet of the evaporator 5 and the temperature T 1 measured by the second temperature sensor 15 at the coolant outlet of the evaporator 5 K to 10 K.
  • This temperature difference ⁇ T A is when the Ver steamer larger, because the temperature, which the defrost temperature sensor 15 measures at the coolant outlet of the evaporator 5, decreases due to the reduced heat absorption of the evaporator due to the ice.
  • the injection valve 4 counteracts the increase in the temperature difference ⁇ T A , but since it is a backward control, it cannot fully compensate for this.
  • the temperature difference ⁇ T A between the defrost temperature sensor and the temperature sensor 14 in the air flow at the inlet of the evaporator thus increases by an increase ⁇ T of approximately 5 K when it is iced up.
  • FIG. 2 shows a block diagram of a device for temperature-dependent defrosting of cooling systems, which carries out the method according to the invention.
  • the difference ⁇ T A T15 - T V from a difference-forming element 20 formed.
  • the difference-forming member 20 receives the temperatures T1 T and T V corresponding signals from the temperature sensors 15 and 14 and a release signal indicating the above-mentioned first condition.
  • An output signal of the difference-forming element 20, which corresponds to the difference ⁇ T A formed, is applied to a first comparator 22 and is compared there with a signal 31 which corresponds to a first predetermined temperature reference value ⁇ T A ⁇ , which is higher than the increase amount ⁇ T the temperature difference .DELTA.T A determined under normal cooling conditions, that is to say with an iced-up evaporator.
  • the comparison signal 31 supplied to the first comparator 22 is advantageously adjustable, since, as mentioned above, the temperature difference ⁇ T A depends on the load on the cooling system. As soon as the temperature difference ⁇ T A compared by the first comparator 22 reaches or exceeds the predetermined reference value ( ⁇ T A ⁇ ), the first comparator 22 delivers an output signal.
  • the time period ⁇ t 1 is advantageously adjustable and is preferably 4 1/2 minutes.
  • the output signal of the logic element 27 sets a switching element 25, which is shown in the exemplary embodiment according to FIG. 2 as a flip-flop.
  • the switching element 25 In response to the signal at its set input, the switching element 25 generates a defrost signal 35 at its output, and the subsequent actuators (not shown) at the start the defrosting process is supplied. With the beginning of the defrost signal 35, a second timer 24 is started, which prevents, via a further logic element 28, that a further defrosting process is started before a second time period ⁇ t2 has elapsed. The second timer 24 accordingly blocks the switching element 25 for the time period ⁇ t2, which can be set by means of the signal 34 and is preferably 2 hours.
  • the defrosting process is terminated depending on the temperature, namely as soon as the temperature T V detected by the temperature sensor 14 reaches or exceeds a comparison temperature T V ⁇ .
  • the circuit shown in FIG. 2 contains a further comparator 21, which compares the temperature T V with the comparison value T V ⁇ in accordance with the signal 30. This is also adjustable and is preferably 5 ° C. The output signal of the second comparator 21 then generated resets the switching element 25, whereupon the defrost signal 35 is ended.
  • the device shown in FIG. 2 is only shown as a basic circuit diagram in its functional blocks. However, it can also be a functional part of a control device of the cooling system, which can also be a digital control device controlled by a microprocessor, for example.
  • FIG. 3 shows a time diagram illustrating the function of the device according to the invention shown in FIG. 2 when used in the refrigeration circuit shown in FIG. 1.
  • Fig. 3 the temperature responses of the sensors 14 and 15 measured temperatures T V and T15 are shown. At the time t0 the icing of the evaporator is assumed. From this point in time the temperature T15 at the outlet of the evaporator 5 drops, while that of Temperature sensor 14 measured temperature T14 remains essentially constant.
  • the temperature difference ⁇ T A detected by the difference forming element reaches the predetermined comparison value ⁇ T A ⁇ at the time t 1.
  • the temperature difference ⁇ T A must last for approximately 4 1/2 minutes from the time t 1 until the defrost signal 35 begins at the time t 2.
  • the temperature T V then increases gradually and the temperature T 1 5 increases very quickly because of the hot gas flowing through the evaporator.
  • the temperature T V in the air flow at the inlet of the evaporator 5 is to reach the comparison temperature T V ⁇ , that is to say, for example 5 ° C., at the time t 3, as a result of which the switching element 25 is reset and the defrosting process is ended.
  • the timer 24 is used for the period of e.g. 2 hours from the start of the defrost at time t2 to prevent another defrost.
  • the comparison temperature values T V ⁇ , ⁇ T A ⁇ that is to say the comparison signals 30 and 31 supplied to the comparators 21 and 22 and the time periods ⁇ t 1 and ⁇ t 2 determined by the timing elements 23 and 24, that is to say the signals 33 and 34 are variably adjustable so that the device according to the invention can be adapted to different possible uses.

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  • 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)
EP87105194A 1987-04-08 1987-04-08 Procédé et dispositif pour le dégivrage selon besoin dépendant de la température des installations frigorifiques Withdrawn EP0285690A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP87105194A EP0285690A1 (fr) 1987-04-08 1987-04-08 Procédé et dispositif pour le dégivrage selon besoin dépendant de la température des installations frigorifiques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87105194A EP0285690A1 (fr) 1987-04-08 1987-04-08 Procédé et dispositif pour le dégivrage selon besoin dépendant de la température des installations frigorifiques

Publications (1)

Publication Number Publication Date
EP0285690A1 true EP0285690A1 (fr) 1988-10-12

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EP87105194A Withdrawn EP0285690A1 (fr) 1987-04-08 1987-04-08 Procédé et dispositif pour le dégivrage selon besoin dépendant de la température des installations frigorifiques

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EP (1) EP0285690A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0501387A2 (fr) * 1991-02-25 1992-09-02 KÜBA KÄLTETECHNIK GmbH Procédé et dispositif pour optimaliser la performance et pour commander la dégirage d'évaporateurs de réfrigérant
FR2674010A1 (fr) * 1991-03-14 1992-09-18 Sereth Procede pour enclencher le degivrage d'un echangeur thermique.
EP0881440A3 (fr) * 1997-05-27 1999-10-06 R.C. Condizionatori S.p.A. Commande de dégivrage d'évaporateur pour une unité de pompe à chaleur à air
ES2136566A1 (es) * 1997-11-05 1999-11-16 Zotes Fernandez Primitivo Procedimiento de control de funcionamiento de una camara frigorifica.
DE102005054104A1 (de) * 2005-11-12 2007-05-24 Stiebel Eltron Gmbh & Co. Kg Verfahren und Vorrichtung zum Regeln eines Abtauvorgangs eines Verdampfers einer Kältemaschine
WO2010078998A2 (fr) 2008-12-18 2010-07-15 BSH Bosch und Siemens Hausgeräte GmbH Appareil frigorifique doté d'un chauffage de dégivrage
EP2366968A3 (fr) * 2010-03-17 2012-07-18 Wolf GmbH Procédé et dispositif de décongélation d'un évaporateur d'un dispositif de pompe à chaleur
WO2013007618A3 (fr) * 2011-07-14 2013-07-25 BSH Bosch und Siemens Hausgeräte GmbH Appareil frigorifique sans givre et procédé de dégivrage d'un évaporateur
EP2719978A1 (fr) * 2012-10-15 2014-04-16 Whirlpool Corporation Procédé de commande d'un appareil frigorifique domestique
AT14941U1 (de) * 2010-03-04 2016-09-15 Vaillant Group Austria Gmbh Verfahren zum Abtauen eines Luft-Sole-Wärmetauschers einer Wärmepumpe mit einem Solekreislauf
US10974289B2 (en) 2013-03-27 2021-04-13 Halliburton Energy Services, Inc. Methods of mitigating bituminous material adhesion using nano-particles

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2427563A1 (fr) * 1978-05-30 1979-12-28 Gen Electric Appareil de commande de degivrage pour systeme de conditionnement de la temperature
US4373349A (en) * 1981-06-30 1983-02-15 Honeywell Inc. Heat pump system adaptive defrost control system
DE3227604A1 (de) * 1981-07-29 1983-02-24 Olsberg Gesellschaft für Produktion und Absatz mbH, 5790 Brilon Automatische abtauregelvorrichtung fuer waermepumpen-verdampfer
GB2133867A (en) * 1983-01-21 1984-08-01 Newtech Controls Ltd Defrost control means
EP0142663A2 (fr) * 1983-09-20 1985-05-29 MAN Technologie Aktiengesellschaft Procédé et dispositif de commande du dégivrage pour pompes à chaleur
EP0164948A2 (fr) * 1984-06-12 1985-12-18 York International Corporation Système de commande et procédé pour le dégivrage du serpentin extérieur d'une pompe à chaleur
US4573326A (en) * 1985-02-04 1986-03-04 American Standard Inc. Adaptive defrost control for heat pump system
DE3441912A1 (de) * 1984-11-16 1986-05-28 Fichtel & Sachs Ag, 8720 Schweinfurt Verfahren zum automatischen abtauen eines luftbeaufschlagten verdampfers einer waermepumpe
DE3509664A1 (de) * 1985-03-18 1986-09-25 SEP Gesellschaft für technische Studien, Entwicklung, Planung mbH, 8000 München Verfahren und vorrichtung zur automatischen abtauung luftbeaufschlagter verdampfer in kaeltemittelkreislaeufen, insbes. von waermepumpen

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2427563A1 (fr) * 1978-05-30 1979-12-28 Gen Electric Appareil de commande de degivrage pour systeme de conditionnement de la temperature
US4373349A (en) * 1981-06-30 1983-02-15 Honeywell Inc. Heat pump system adaptive defrost control system
DE3227604A1 (de) * 1981-07-29 1983-02-24 Olsberg Gesellschaft für Produktion und Absatz mbH, 5790 Brilon Automatische abtauregelvorrichtung fuer waermepumpen-verdampfer
GB2133867A (en) * 1983-01-21 1984-08-01 Newtech Controls Ltd Defrost control means
EP0142663A2 (fr) * 1983-09-20 1985-05-29 MAN Technologie Aktiengesellschaft Procédé et dispositif de commande du dégivrage pour pompes à chaleur
EP0164948A2 (fr) * 1984-06-12 1985-12-18 York International Corporation Système de commande et procédé pour le dégivrage du serpentin extérieur d'une pompe à chaleur
DE3441912A1 (de) * 1984-11-16 1986-05-28 Fichtel & Sachs Ag, 8720 Schweinfurt Verfahren zum automatischen abtauen eines luftbeaufschlagten verdampfers einer waermepumpe
US4573326A (en) * 1985-02-04 1986-03-04 American Standard Inc. Adaptive defrost control for heat pump system
DE3509664A1 (de) * 1985-03-18 1986-09-25 SEP Gesellschaft für technische Studien, Entwicklung, Planung mbH, 8000 München Verfahren und vorrichtung zur automatischen abtauung luftbeaufschlagter verdampfer in kaeltemittelkreislaeufen, insbes. von waermepumpen

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0501387A2 (fr) * 1991-02-25 1992-09-02 KÜBA KÄLTETECHNIK GmbH Procédé et dispositif pour optimaliser la performance et pour commander la dégirage d'évaporateurs de réfrigérant
EP0501387A3 (en) * 1991-02-25 1993-02-24 Kueba Kaeltetechnik Gmbh Method and device for performance optimising and defrosting control of refrigerant evaporators
FR2674010A1 (fr) * 1991-03-14 1992-09-18 Sereth Procede pour enclencher le degivrage d'un echangeur thermique.
EP0881440A3 (fr) * 1997-05-27 1999-10-06 R.C. Condizionatori S.p.A. Commande de dégivrage d'évaporateur pour une unité de pompe à chaleur à air
ES2136566A1 (es) * 1997-11-05 1999-11-16 Zotes Fernandez Primitivo Procedimiento de control de funcionamiento de una camara frigorifica.
DE102005054104A1 (de) * 2005-11-12 2007-05-24 Stiebel Eltron Gmbh & Co. Kg Verfahren und Vorrichtung zum Regeln eines Abtauvorgangs eines Verdampfers einer Kältemaschine
WO2010078998A2 (fr) 2008-12-18 2010-07-15 BSH Bosch und Siemens Hausgeräte GmbH Appareil frigorifique doté d'un chauffage de dégivrage
WO2010078998A3 (fr) * 2008-12-18 2011-03-03 BSH Bosch und Siemens Hausgeräte GmbH Appareil frigorifique doté d'un chauffage de dégivrage
US9534826B2 (en) 2008-12-18 2017-01-03 BSH Hausgeräte GmbH Refrigerator having a defrost heater
AT14941U1 (de) * 2010-03-04 2016-09-15 Vaillant Group Austria Gmbh Verfahren zum Abtauen eines Luft-Sole-Wärmetauschers einer Wärmepumpe mit einem Solekreislauf
EP2366968A3 (fr) * 2010-03-17 2012-07-18 Wolf GmbH Procédé et dispositif de décongélation d'un évaporateur d'un dispositif de pompe à chaleur
WO2013007618A3 (fr) * 2011-07-14 2013-07-25 BSH Bosch und Siemens Hausgeräte GmbH Appareil frigorifique sans givre et procédé de dégivrage d'un évaporateur
EP2719978A1 (fr) * 2012-10-15 2014-04-16 Whirlpool Corporation Procédé de commande d'un appareil frigorifique domestique
US10974289B2 (en) 2013-03-27 2021-04-13 Halliburton Energy Services, Inc. Methods of mitigating bituminous material adhesion using nano-particles

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