EP1367346B1 - Procédé de commande de l'opération de dégivrage d'un évaporateur - Google Patents

Procédé de commande de l'opération de dégivrage d'un évaporateur Download PDF

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Publication number
EP1367346B1
EP1367346B1 EP03010509A EP03010509A EP1367346B1 EP 1367346 B1 EP1367346 B1 EP 1367346B1 EP 03010509 A EP03010509 A EP 03010509A EP 03010509 A EP03010509 A EP 03010509A EP 1367346 B1 EP1367346 B1 EP 1367346B1
Authority
EP
European Patent Office
Prior art keywords
evaporator
air
determined
water
water mass
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 - Lifetime
Application number
EP03010509A
Other languages
German (de)
English (en)
Other versions
EP1367346A3 (fr
EP1367346A2 (fr
Inventor
Thomas Krieger
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.)
Carrier Kaeltetechnik Deutschland GmbH
Original Assignee
Linde Kaeltetechnik 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.)
Filing date
Publication date
Application filed by Linde Kaeltetechnik GmbH filed Critical Linde Kaeltetechnik GmbH
Publication of EP1367346A2 publication Critical patent/EP1367346A2/fr
Publication of EP1367346A3 publication Critical patent/EP1367346A3/fr
Application granted granted Critical
Publication of EP1367346B1 publication Critical patent/EP1367346B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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
    • 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

Definitions

  • a defrosting process in evaporators of refrigeration equipment usually at fixed intervals - for example, twice a day - performed. These are by means of a defrost timer fixed defrost - z. B. 6:00 and 18:00 clock set. At these times, a defrosting process is then initiated, which is only terminated when a temperature sensor arranged on the evaporator to be defrosted has reached a predetermined desired value.
  • the defrosting time actually required for the defrosting process - ie the time interval between defrost start and end - is determined and stored by the defrost control. On the basis of this stored defrost duration, it is subsequently determined whether the next or the next regular, fixed defrosting processes can be skipped due to a small buildup of frost on the evaporator.
  • a disadvantage of this procedure is that based on the last defrosting process predictions are made about future defrost processes. All current load changes of the evaporator to be doused can thus not be taken into account.
  • the document DE 43 18 842 A1 describes a method for defrosting the air coolers of a refrigeration system, the temperature and the relative humidity being periodically detected in the installation area of the refrigeration system, the water content of the air being calculated with the aid of the determined measured values, the determined values for The water content of the air from the individual measurements are cumulative and the defrost of the air cooler is initiated upon reaching or exceeding a predetermined limit.
  • Object of the present invention is to provide a generic method for controlling the defrosting process of a frosted and / or iced evaporator, which avoids the disadvantage described above.
  • evaporator return air and "evaporator supply air” respectively designate the air flow which enters the evaporator or exits the evaporator.
  • the air thus enters the evaporator at a temperature T RL and the relative humidity ⁇ RL and leaves it at the temperature T ZL in the saturated state.
  • the relative humidity ⁇ ZL of the evaporator supply air is therefore assumed to be 1.
  • the water mass values determined between two defrosting processes are added up and compared with an adjustable water mass desired value.
  • the term "between two defrosting processes” should also be understood as meaning the period between a (re) start-up of the evaporator or the refrigerator and the first subsequent defrosting process.
  • the second alternative of the method according to the invention can now be configured such that a defrosting process is initiated at the latest when the desired water mass is reached.
  • the aforementioned parameters relative humidity ( ⁇ RL ) of the evaporator return air, water loading at the evaporator unit (x RL ) and water loading at the evaporator outlet (x ZL ) are detected essentially continuously.
  • the inventive method for controlling the defrosting process of a frosted and / or iced evaporator now allows a continuous detection of the real water load on the evaporator, with the result that each optimal time for a defrosting process actually required can be determined. This results in an optimization of the energy consumption of the evaporator or the evaporator having cooling cabinet as well as an increase in reliability, in particular an increase in the temperature safety of the stored in the refrigerated goods.

Claims (5)

  1. Procédé de commande du processus de dégivrage d'un évaporateur couvert de givre et/ou de gel, en particulier d'un évaporateur pour armoire frigorifique, caractérisé en ce que les températures de l'air de recirculation de l'évaporateur (TRL) et de l'air d'amenée de l'évaporateur (TZL) ainsi que la température d'évaporation sont saisies,
    a) en ce que l'humidité relative (ϕRL) de l'air de recirculation de l'évaporateur est saisie,
    b) en ce que l'humidité relative (ϕZL) de l'air d'amenée de l'évaporateur est supposée être 1, celle-ci étant en état de saturation après passage par l'évaporateur,
    c) en ce que le débit volumique (VL) de l'air de recirculation est déterminé,
    d) en ce qu'au moyen de l'équation d'état pour l'air humide, la charge en eau est définie à l'entrée (xRL) et à la sortie (xZL) de l'évaporateur, et la quantité d'eau déposée sur l'évaporateur (Δx = xRL-xZL) est déterminée,
    e) en ce qu'au moyen de l'équation mw = ρL * VL * Δx * Δt pour un intervalle temporel (Δt), la masse d'eau déposée sur l'évaporateur est déterminée, le paramètre ρL se rapportant à la densité de l'air,
    f) en ce que les valeurs de masse d'eau ainsi déterminées (mw) sont totalisées entre deux processus de dégivrage et comparées à une valeur de consigne réglable pour la masse d'eau, et
    g) en ce qu'un processus de dégivrage est déclenché si la valeur de consigne de masse d'eau est atteinte.
  2. Procédé de commande du processus de dégivrage d'un évaporateur couvert de givre et/ou de gel, en particulier d'un évaporateur pour armoire frigorifique, caractérisé en ce que les températures de l'air de recirculation de l'évaporateur (TRL) et de l'air d'amenée de l'évaporateur (TZL) ainsi que la température d'évaporation sont saisies,
    a) en ce que l'humidité relative (ϕRL) de l'air de recirculation de l'évaporateur est saisie,
    b) en ce que l'humidité relative (ϕZL) de l'air d'amenée de l'évaporateur est supposée être 1, celle-ci étant en état de saturation après passage par l'évaporateur,
    c) en ce que le débit volumique (VL) de l'air de recirculation est déterminé,
    d) en ce qu'au moyen de l'équation d'état pour l'air humide, la charge en eau est définie à l'entrée (xRL) et à la sortie (xZL) de l'évaporateur, et la quantité d'eau déposée sur l'évaporateur (Δx = xRL - xZL) est déterminée,
    e) en ce qu'au moyen de l'équation mw = ρL * VL * Δx * Δt pour un intervalle temporel (Δt), la masse d'eau déposée sur l'évaporateur est déterminée, le paramètre ρL se rapportant à la densité de l'air,
    f) en ce que les valeurs de masse d'eau ainsi déterminées (mw) sont totalisées entre deux processus de dégivrage et comparées à une valeur de consigne réglable pour la masse d'eau,
    g) en ce qu'une comparaison est effectuée entre la valeur de consigne de masse d'eau et la valeur actuelle de masse d'eau si un moment réglable pour le processus de dégivrage est atteint, ou immédiatement avant celui-ci,
    h) en ce que le moment prévisible où la valeur de consigne de masse d'eau est déterminé au moyen de la valeur actuelle de masse d'eau et du taux moyen d'humidité depuis le dernier processus de dégivrage, et
    i) en ce que le processus de dégivrage suivant est omis ou retardé si le moment où la valeur de consigne de masse d'eau est atteinte est postérieur au moment réglé pour le processus de dégivrage, tandis que
    j) le processus de dégivrage suivant sera déclenché, si le moment où la valeur de consigne de masse d'eau est atteinte est antérieur au moment réglé pour le processus de dégivrage.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'au moins les paramètres d'humidité relative (ϕRL) de l'air de recirculation de l'évaporateur, de charge en eau à l'entrée (xRL) de l'évaporateur et de charge en eau à la sortie (xZL) de l'évaporateur sont essentiellement déterminés de manière continue.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le paramètre de débit volumique (VL) de l'air de recirculation de l'évaporateur n'est déterminé qu'une seule fois.
  5. Procédé selon l'une des revendications 2 à 4, caractérisé en ce qu'un processus de dégivrage est déclenché au plus tard quand la valeur de consigne de masse d'eau est atteinte.
EP03010509A 2002-05-28 2003-05-09 Procédé de commande de l'opération de dégivrage d'un évaporateur Expired - Lifetime EP1367346B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10223716A DE10223716A1 (de) 2002-05-28 2002-05-28 Verfahren zum Steuern des Abtauprozesses eines Verdampfers
DE10223716 2002-05-28

Publications (3)

Publication Number Publication Date
EP1367346A2 EP1367346A2 (fr) 2003-12-03
EP1367346A3 EP1367346A3 (fr) 2005-08-03
EP1367346B1 true EP1367346B1 (fr) 2007-03-28

Family

ID=29414232

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03010509A Expired - Lifetime EP1367346B1 (fr) 2002-05-28 2003-05-09 Procédé de commande de l'opération de dégivrage d'un évaporateur

Country Status (4)

Country Link
EP (1) EP1367346B1 (fr)
AT (1) ATE358264T1 (fr)
DE (2) DE10223716A1 (fr)
ES (1) ES2283677T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6964172B2 (en) * 2004-02-24 2005-11-15 Carrier Corporation Adaptive defrost method
US7802441B2 (en) 2004-05-12 2010-09-28 Electro Industries, Inc. Heat pump with accumulator at boost compressor output
US7849700B2 (en) 2004-05-12 2010-12-14 Electro Industries, Inc. Heat pump with forced air heating regulated by withdrawal of heat to a radiant heating system
DE102006048880A1 (de) 2006-10-16 2008-04-17 Wurm Gmbh & Co. Kg Elektronische Systeme Abtausteuerverfahren
CN108646695B (zh) * 2018-07-12 2020-05-22 杭州数亦有道科技有限公司 一种用于蒸发工序的智能控制方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3759049A (en) * 1972-02-25 1973-09-18 Whirlpool Co Defrost control
DE3110042A1 (de) * 1981-03-16 1982-09-30 Gesellschaft für Wärmepumpen und Energierückgewinnungsanlagen mbH, 7311 Holzmaden Verfahren und anordnung zum abtauen von eis an einem luftkuehler einer waermepumpe oder kaeltemaschine
US4561263A (en) * 1983-03-28 1985-12-31 Honeywell Inc. Refrigeration or heat pump system defrost
DE3333907A1 (de) * 1983-09-20 1985-04-04 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8000 München Verfahren und vorrichtung zur abtauregelung von waermepumpen
DE4318842A1 (de) * 1993-06-07 1994-12-08 York Int Gmbh Verfahren zum Abtauen einer Kälteanlage
DE4318843A1 (de) * 1993-06-07 1994-12-08 York Int Gmbh Verfahren zum Betätigen von Rahmenheizungen in Kühlmöbeln
DE19844854A1 (de) * 1998-09-30 2000-04-06 Winfried H Eming Verfahren zur zeitunabhängigen Abtauung von Kälteverdampfern in Kühlmöbeln und Kühlmöbel zur Durchführung des Verfahrens

Also Published As

Publication number Publication date
EP1367346A3 (fr) 2005-08-03
ES2283677T3 (es) 2007-11-01
EP1367346A2 (fr) 2003-12-03
DE50306888D1 (de) 2007-05-10
ATE358264T1 (de) 2007-04-15
DE10223716A1 (de) 2003-12-11

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