EP0124110A2 - Defrosting device for several refrigeration plants - Google Patents

Defrosting device for several refrigeration plants Download PDF

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Publication number
EP0124110A2
EP0124110A2 EP84104776A EP84104776A EP0124110A2 EP 0124110 A2 EP0124110 A2 EP 0124110A2 EP 84104776 A EP84104776 A EP 84104776A EP 84104776 A EP84104776 A EP 84104776A EP 0124110 A2 EP0124110 A2 EP 0124110A2
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EP
European Patent Office
Prior art keywords
evaporator
compressor
condenser
refrigerant circuit
defrosting device
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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.)
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Application number
EP84104776A
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German (de)
French (fr)
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EP0124110A3 (en
Inventor
Manfred Umbach
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    • 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
    • F25D21/06—Removing frost
    • F25D21/12—Removing frost by hot-fluid circulating system separate from the refrigerant system
    • 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
    • F25B2400/06—Several compression cycles arranged in parallel
    • 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
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • F25B40/04—Desuperheaters
    • 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

Definitions

  • the invention relates to a defrosting device for a plurality of refrigeration systems.
  • Such a defrosting device is known from DE-OS 28 41 765, in which an additional condenser is switched into the refrigerant circuit of the refrigeration system, which is also connected to a heat circuit.
  • an additional condenser is switched into the refrigerant circuit of the refrigeration system, which is also connected to a heat circuit.
  • the heat circuit consists of a separate liquid circuit which is supplied to the defrost lines in or on the evaporator via controllable valves, so that defrosting of the evaporators can be carried out as required.
  • the heat cycle, for which an additional condenser is required, is complex.
  • the object of the present invention is to provide a defrosting device according to the preamble of claim 1, in which one can do without additional capacitors and separate heating circuits.
  • two refrigeration systems are provided, each having a refrigerant circuit 1 or 2, each comprising an evaporator 11 or 21, a condenser 12 or 22 and a compressor 13 or 23.
  • the evaporators 11, 21 are provided with an additional tube 14 or 24.
  • a solenoid valve 15 is arranged between the compressor 13 and the condenser 12. Between the compressor 13 and the solenoid valve 15, a line leading to the bore 24 of the evaporator 21 is provided with a solenoid valve 26, while the outlet of the bore 24 is connected via a check valve 27 to the line between the solenoid valve 15 and the condenser 12.
  • the refrigerant circuit 2 has a solenoid valve 25 between its compressor 23 and its condenser 22, the additional pipe 14 of the evaporator 11 of the refrigerant circuit 1 in turn being connected to the high-pressure side of the compressor 23 via a solenoid valve 16, while the pipe 14 is connected on the outlet side via a check valve 17 is connected to the line between the solenoid valve 25 and the capacitor 22.
  • the refrigerant heated in the compressor 23 is thus supplied to the bore 14 and thus to the evaporator 11 by closing the solenoid valve 25 and opening the solenoid valve 16.
  • the evaporator 31 is in turn provided with an additional bore 34.
  • the additional tubing 34 can preferably be fed from the high pressure side of the compressor 23 (again via a solenoid valve 36 and a check valve 37) by closing the solenoid valve 25 and opening the solenoid valve 36 to defrost the evaporator 31.
  • the largest compressor 23 present is preferably used to defrost the evaporators of the further refrigerant circuits 1, 3 (in the case of three or more refrigeration systems), while in particular the second largest compressor 13 is used to defrost the evaporator 21 in the refrigerant circuit 2, which contains the largest compressor 23 .
  • the check valves 17, 27, 37 prevent refrigerant shift during non-defrosting times.
  • the capacitors 12, 22, 32 can be air-cooled or water-cooled (indicated by a fan blade 40), whereby they are controlled via a pressostat 41 - similar to a heat recovery operation.
  • a subsequent or residual liquefaction of the refrigerant coming from the respective additional tubing 14, 24, 34 can be carried out in the condensers 12 and 22.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)

Abstract

Each refrigeration plant has a refrigerant circuit possessing a compressor, a condenser and an evaporator. In order to achieve easy defrosting, each evaporator is provided with additional tubing or a small-surfaced liquefier, the tubing or the liquefier for the evaporator of one refrigerant circuit being in each case connectable via a controllable valve to the high pressure side of a compressor of another refrigerant circuit.

Description

Die Erfindung betrifft eine Abtaueinrichtung für mehrere Kälteanlagen nach dem Oberbegriff des Anspruchs 1.The invention relates to a defrosting device for a plurality of refrigeration systems.

Eine derartige Abtaueinrichtung ist aus der DE-OS 28 41 765 bekannt, bei der ein zusätzlicher Kondensator in den Kältemittelkreislauf der Kälteanlage eingeschaltet ist, der außerdem an einen Wärmekreislauf angeschlossen ist. Durch entsprechendes öffnen und Schließen von Ventilen, die beiderseits des zusätzlichen Kondensators im Wärmekreislauf vorgesehen sind, kann die von diesem erzeugte Wärme dem Wärmekreislauf zugeführt werden. Der Wärmekreislauf besteht aus einem separaten Flüssigkeitskreislauf, der über steuerbare Ventile Abtauleitungen im oder am Verdampfer zugeführt wird, so daß eine bedarfsbedingte Abtauung der Verdampfer vorgenommen werden kann. Der Wärmekreislauf, für den ein zusätzlicher Kondensator benötigt wird, ist aufwendig.Such a defrosting device is known from DE-OS 28 41 765, in which an additional condenser is switched into the refrigerant circuit of the refrigeration system, which is also connected to a heat circuit. By appropriately opening and closing valves which are provided on both sides of the additional condenser in the heat circuit, the heat generated by this can be supplied to the heat circuit. The heat circuit consists of a separate liquid circuit which is supplied to the defrost lines in or on the evaporator via controllable valves, so that defrosting of the evaporators can be carried out as required. The heat cycle, for which an additional condenser is required, is complex.

Aufgabe der vorliegenden Erfindung ist es, eine Abtaueinrichtung nach dem Oberbegriff des Anspruchs 1 zu schaffen, bei der man auf zusätzliche Kondensatoren und getrennte Wärmekreisläufe verzichten kann.The object of the present invention is to provide a defrosting device according to the preamble of claim 1, in which one can do without additional capacitors and separate heating circuits.

Diese Aufgabe wird entsprechend dem kennzeichnenden Teil des Anspruchs 1 gelöst.This object is achieved in accordance with the characterizing part of claim 1.

Zum Abtauen der Kälteanlagen wird somit kein eigenständiger Wärmekreislauf benötigt, vielmehr wird die Funktion des Wärmekreislaufes von Schleifen der Kältemittelkreisläufe übernommen,ohne daß die Kältemittelkreisläufe unterbrochen werden müßten.No independent heating circuit is therefore required for defrosting the refrigeration systems. Rather, the function of the heating circuit is taken over by loops of the refrigerant circuits without the refrigerant circuits having to be interrupted.

Weitere Ausgestaltungen der Erfindung sind der nachfolgenden Beschreibung und den Unteransprüchen zu entnehmen.Further embodiments of the invention can be found in the following description and the subclaims.

Die Erfindung wird nachstehend anhand eines in der beigefügten Abbildung dargestellten Ausführungsbeispiels näher erläutert.The invention is explained below with reference to an embodiment shown in the accompanying figure.

Bei dem dargestellten Ausführungsbeispiel sind zwei Kälteanlagen vorgesehen, die jeweils einen Kältemittelkreislauf 1 bzw. 2 aufweisen, die jeweils einen Verdampfer 11 bzw. 21, einen Kondensator 12 bzw. 22 und einen Verdichter 13 bzw. 23 umfassen. Die Verdampfer 11, 21 sind mit einer zusätzlichen Berohrung 14 bzw. 24 versehen. Zwischen dem Verdichter 13 und dem Kondensator 12 ist ein Magnetventil 15 angeordnet. Zwischen dem Verdichter 13 und dem Magnetventil 15 ist eine zu der Berohrung 24 des Verdampfers 21 führende Leitung mit einem Magnetventil 26 vorgesehen, während der Ausgang der Berohrung 24 über ein Rückschlagventil 27 mit der Leitung zwischen dem Magnetventil 15 und dem Kondensator 12 verbunden ist.In the exemplary embodiment shown, two refrigeration systems are provided, each having a refrigerant circuit 1 or 2, each comprising an evaporator 11 or 21, a condenser 12 or 22 and a compressor 13 or 23. The evaporators 11, 21 are provided with an additional tube 14 or 24. A solenoid valve 15 is arranged between the compressor 13 and the condenser 12. Between the compressor 13 and the solenoid valve 15, a line leading to the bore 24 of the evaporator 21 is provided with a solenoid valve 26, while the outlet of the bore 24 is connected via a check valve 27 to the line between the solenoid valve 15 and the condenser 12.

Durch Schließen des Magnetventils 15 und öffnen des Magnetventils 26 kann die vom Verdichter erzeugte und somit im Kältemittel vorhandene Wärme der zusätzlichen Berohrung 24 des Verdichters 21 zum Abtauen von diesem zugeführt werden.By closing the solenoid valve 15 and opening the solenoid valve 26, the heat generated by the compressor and thus present in the refrigerant can be supplied to the additional bore 24 of the compressor 21 for defrosting it.

Ebenso besitzt der Kältemittelkreislauf 2 ein Magnetventil 25 zwischen dessen Verdichter 23 und dessen Kondensator 22, wobei die zusätzliche Berohrung 14 des Verdampfers 11 des Kältemittelkreislaufs 1 wiederum über ein Magnetventil 16 mit der Hochdruckseite des Verdichters 23 verbunden ist, während die Berohrung 14 austrittsseitig über ein Rückschlagventil 17 mit der Leitung zwischen dem Magnetventil 25 und dem Kondensator 22 verbunden ist. Zum Abtauen des Verdampfers 11 wird somit das im Verdichter 23 erwärmte Kältemittel durch Schließen des Magnetventils 25 und öffnen des Magnetventils 16 der Berohrung 14 und damit dem Verdampfer 11 zugeführt.Likewise, the refrigerant circuit 2 has a solenoid valve 25 between its compressor 23 and its condenser 22, the additional pipe 14 of the evaporator 11 of the refrigerant circuit 1 in turn being connected to the high-pressure side of the compressor 23 via a solenoid valve 16, while the pipe 14 is connected on the outlet side via a check valve 17 is connected to the line between the solenoid valve 25 and the capacitor 22. To defrost the evaporator 11, the refrigerant heated in the compressor 23 is thus supplied to the bore 14 and thus to the evaporator 11 by closing the solenoid valve 25 and opening the solenoid valve 16.

Wenn weitere Kälteanlagen, beispielsweise mit einem Kältemittelkreislauf 3 vorhanden sind, der einen Verdampfer 31, einen Kondensator 32 und einen Verdichter 33 umfasst, ist der Verdampfer 31 wiederum mit einer zusätzlichen Berohrung 34 versehen. Die zusätzliche Berohrung 34 kann vorzugsweise von der Hochdruckseite des Verdichters 23 ( ebenfalls wiederum über ein Magnetventil 36 und ein Rückschlagventil 37 ) durch Schließen des Magnetventils 25 und öffnen des Magnetventils 36 zum Abtauen des Verdampfers 31 gespeist werden. Hierbei wird vorzugsweise der größte vorhandene Verdichter 23 zum Abtauen der Verdampfer der weiteren Kältemittelkreisläufe 1, 3 ( bei drei oder mehr Kälteanlagen ) verwendet, während insbesondere der zweitgrößte Verdichter 13 zum Abtauen des Verdampfers 21 im Kältemittelkreislauf 2, der den größten Verdichter 23 enthält, verwendet.If further refrigeration systems are present, for example with a refrigerant circuit 3, which comprises an evaporator 31, a condenser 32 and a compressor 33, the evaporator 31 is in turn provided with an additional bore 34. The additional tubing 34 can preferably be fed from the high pressure side of the compressor 23 (again via a solenoid valve 36 and a check valve 37) by closing the solenoid valve 25 and opening the solenoid valve 36 to defrost the evaporator 31. The largest compressor 23 present is preferably used to defrost the evaporators of the further refrigerant circuits 1, 3 (in the case of three or more refrigeration systems), while in particular the second largest compressor 13 is used to defrost the evaporator 21 in the refrigerant circuit 2, which contains the largest compressor 23 .

Die Rückschlagventile 17, 27, 37 verhindern eine Kältemittelverlagerung während der Nichtabtauzeiten.The check valves 17, 27, 37 prevent refrigerant shift during non-defrosting times.

Die Kondensatoren 12, 22, 32 können luft- oder wassergekühlt ( angedeutet durch einen Ventilatorflügel 40 ) sein, wobei sie über einen Pressostaten 41 - ähnlich einem Wärmerückgewinnungsbetrieb - angesteuert werden.The capacitors 12, 22, 32 can be air-cooled or water-cooled (indicated by a fan blade 40), whereby they are controlled via a pressostat 41 - similar to a heat recovery operation.

In den Kondensatoren 12 und 22 kann eine Nach- bzw. Restverflüssigung des von der jeweiligen zusätzlichen Berohrung 14, 24, 34 kommenden Kältemittels vorgenommen werden.A subsequent or residual liquefaction of the refrigerant coming from the respective additional tubing 14, 24, 34 can be carried out in the condensers 12 and 22.

Bei Kühlmöbeln genügt der Einsatz von Rippenrohren oder kleinflächigen Verflüssigern einreihig mit gleicher Höhe oder Anströmbreite des Kühlmöbelverdampfers. Bei Kühlraumverdampfern ist auch eine zusätzliche Berohrung einer dort vorhandenen Tropfrinne erforderlich, etwa in Form einer Rohrschlange.For refrigerated cabinets, the use of finned tubes or small-area condensers with the same height or inflow width of the refrigerated cabinet evaporator is sufficient. In the case of cold room evaporators, additional tubing is also required for an existing drip channel, for example in the form of a pipe coil.

Claims (5)

1) Abtaueinrichtung für mehrere Kälteanlagen mit jeweils einem Kältemittelkreislauf, der einen Verdichter, einen Kondensator und einen Verdampfer aufweist, wobei die Verdampfer mit Hilfe von Leitungen, die ein warmes Medium führen, abtaubar sind, dadurch gekennzeichnet, daß jeder Verdampfer ( 11, 21, 31 ) mit einer zusätzlichen Berohrung oder einem kleinflächigen Verflüssiger (14, 24, 34) versehen ist, wobei jeweils die Berohrung oder der Verflüssiger (14, 24, 34) für den Verdampfer (11, 21, 31) eines Kältemittelkreislaufs (1, bzw. 2, bzw. 3) mit der Hochdruckseite eines Verdichters (13, 23, 33) eines weiteren Kältemittelkreislaufs (1, bzw. 2, bzw. 3) ventilgesteuert verbindbar ist.1) Defrosting device for several refrigeration systems, each with a refrigerant circuit, which has a compressor, a condenser and an evaporator, the evaporators being defrostable with the aid of lines which carry a warm medium, characterized in that each evaporator (11, 21, 31) is provided with additional tubing or a small area condenser (14, 24, 34), the tubing or condenser (14, 24, 34) for the evaporator (11, 21, 31) of a refrigerant circuit (1 or 2 or 3) can be connected to the high pressure side of a compressor (13, 23, 33) of a further refrigerant circuit (1, or 2 or 3) in a valve-controlled manner. 2) Abtaueinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß jeweils ein Rückschlagventil (17, 27, 37) an der Austrittsseite der Berohrung oder des Verflüssigers (14, 24, 34) vorgesehen ist.2) Defrosting device according to claim 1, characterized in that a check valve (17, 27, 37) is provided on the outlet side of the pipe or the condenser (14, 24, 34). 3) Abtaueinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Kondensatoren (12, 22, 32) der Kälteanlagen jeweils über einen Pressostaten (41) ansteuerbar sind.3) Defrosting device according to claim 1 or 2, characterized in that the condensers (12, 22, 32) of the refrigeration systems can each be controlled via a pressostat (41). 4) Abtaueinrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der größte vorhandene Verdichter (23) eines Kältemittelkreislaufs (2) hochdruckseitig mit den Berohrungen oder Verflüssigern (14, 34) der Verdampfer (11, 31) aller weiteren Kältemittelkreisläufe (1, 3) und ein Verdichter (13) eines der weiteren Kältemittelkreisläufe (1) hochdruckseitig mit der Berohrung oder dem Verflüssiger (24) des Verdampfers (21) des ersten Kältemittelkreislaufs (2) verbindbar ist.4) Defrosting device according to one of claims 1 to 3, characterized in that the largest existing compressor (23) of a refrigerant circuit (2) on the high pressure side with the tubes or condensers (14, 34) of the evaporators (11, 31) of all other refrigerant circuits (1 , 3) and a compressor (13) of one of the further refrigerant circuits (1) on the high pressure side can be connected to the tubing or the condenser (24) of the evaporator (21) of the first refrigerant circuit (2). 5) Abtaueinrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der nächstkleinere Verdichter (13) der weiteren Kältemittelkreisläufe hochdruckseitig mit der Berohrung oder dem Verflüssiger (24) des Verdampfers (21) des ersten Kältemittelkreislaufs (2) verbindbar ist.5) defrosting device according to claim 4, characterized in that the next smaller compressor (13) of the other refrigerant circuits on the high pressure side with the tubing or the condenser (24) of the evaporator (21) of the first refrigerant circuit (2) can be connected.
EP84104776A 1983-04-28 1984-04-27 Defrosting device for several refrigeration plants Withdrawn EP0124110A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3315391 1983-04-28
DE19833315391 DE3315391A1 (en) 1983-04-28 1983-04-28 DEFROSTING DEVICE FOR SEVERAL REFRIGERATION SYSTEMS

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EP0124110A2 true EP0124110A2 (en) 1984-11-07
EP0124110A3 EP0124110A3 (en) 1985-06-12

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EP84104776A Withdrawn EP0124110A3 (en) 1983-04-28 1984-04-27 Defrosting device for several refrigeration plants

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2825143A1 (en) * 2001-05-28 2002-11-29 Energie Transfert Thermique Monobloc system and hot and cold water production installation, for air conditioning, uses a programmable automatic three way valve to control fluid circulating in principal and auxiliary circuits

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3392541A (en) * 1967-02-06 1968-07-16 Larkin Coils Inc Plural compressor reverse cycle refrigeration or heat pump system
FR2266123A2 (en) * 1974-03-28 1975-10-24 Chapuis Henri
EP0027604A2 (en) * 1979-10-22 1981-04-29 Carrier Corporation Refrigeration system having two refrigeration circuits

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3234754A (en) * 1963-02-18 1966-02-15 Lester K Quick Reevaporator system for hot gas refrigeration defrosting systems
US4122686A (en) * 1977-06-03 1978-10-31 Gulf & Western Manufacturing Company Method and apparatus for defrosting a refrigeration system
DE2841765C2 (en) * 1978-09-26 1983-08-18 Umbach, Manfred, 5020 Frechen Defrosting device for a cold generator
US4359877A (en) * 1981-05-11 1982-11-23 General Electric Company Heat pump coil circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3392541A (en) * 1967-02-06 1968-07-16 Larkin Coils Inc Plural compressor reverse cycle refrigeration or heat pump system
FR2266123A2 (en) * 1974-03-28 1975-10-24 Chapuis Henri
EP0027604A2 (en) * 1979-10-22 1981-04-29 Carrier Corporation Refrigeration system having two refrigeration circuits

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2825143A1 (en) * 2001-05-28 2002-11-29 Energie Transfert Thermique Monobloc system and hot and cold water production installation, for air conditioning, uses a programmable automatic three way valve to control fluid circulating in principal and auxiliary circuits

Also Published As

Publication number Publication date
EP0124110A3 (en) 1985-06-12
DE3315391C2 (en) 1988-07-07
DE3315391A1 (en) 1984-10-31

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