EP1048911A1 - Method for defrosting and drying of refrigeration installations - Google Patents

Method for defrosting and drying of refrigeration installations Download PDF

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Publication number
EP1048911A1
EP1048911A1 EP00107590A EP00107590A EP1048911A1 EP 1048911 A1 EP1048911 A1 EP 1048911A1 EP 00107590 A EP00107590 A EP 00107590A EP 00107590 A EP00107590 A EP 00107590A EP 1048911 A1 EP1048911 A1 EP 1048911A1
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EP
European Patent Office
Prior art keywords
refrigeration system
gas
drying
thawing
gas mixture
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Granted
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EP00107590A
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German (de)
French (fr)
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EP1048911B1 (en
Inventor
Volker Dipl.-Ing. Kamm
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Linde GmbH
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Linde Gas AG
Linde Technische Gase GmbH
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Publication of EP1048911A1 publication Critical patent/EP1048911A1/en
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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
    • 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
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
    • F25D3/11—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air with conveyors carrying articles to be cooled through the cooling space

Definitions

  • the invention relates to a method for thawing and drying a refrigeration system, such as for example a freezer, especially a spiral freezer.
  • the known defrosting methods such as those using open doors or the intake of cold water can be realized, however - at least partially - not inconsiderable disadvantages. For example, become a freezer thawed warm water, this can destroy the insulation in the medium term as well as various parts, such as the connection of two materials with different expansion coefficients.
  • Drying freezers that have a conveyor such as this is the case with the so-called spiral freezers, before (restarting) it makes sense or necessary, otherwise there will be ice on the transport system when driving cold could form, which in turn creates major problems with the funding mechanism can result.
  • the object of the present invention is a method for thawing and drying a refrigeration system, such as a freezer, by means of which the mentioned disadvantages can be avoided.
  • the defrost duration should as well as the drying time are reduced; next to all hygienic Requirements are met.
  • nitrogen is preferably used as the warm gas and / or gas mixture and / or a nitrogen-rich stream is used.
  • the temperature of the used Gas and / or gas mixture is at least 100 ° C.
  • the amount of heat introduced can be gentle, controlled and hygienic Defrosting and drying of the refrigeration system can be realized.
  • the purity of the gas and / or gas mixture used can be the proportion of in the freezer introduced foreign components, such as microorganisms, are minimized.
  • Warm nitrogen can also absorb a lot of moisture. This is especially when drying conveyor systems, such as the belt one Spiral freezer, an advantage. After flushing the refrigeration system or those Areas of the refrigeration system that need to be dried leave the nitrogen Refrigeration system again and takes the moisture with it.
  • the advantages over that previous drying processes "leave doors open" are obvious because neither new dirt or new microorganisms can get into the refrigeration system.
  • heated or heated ambient air is also suitable as a defrost and Dry gas. Under certain circumstances, it may make sense that the ambient air in front the supply to the refrigeration system to be defrosted for cleaning - for example one Adsorption and / or filtering process - is subjected.
  • the method according to the invention for thawing and drying a refrigeration system enables a shortening of the defrosting and drying time and thus one longer operating time of the respective refrigeration system; beyond that it brings Hygienic improvements.
  • Liquid nitrogen is removed from a liquid nitrogen tank 1 via line 2 and supplied to an evaporator 3.
  • the vaporized and thus gaseous nitrogen is fed from the evaporator 3 via line 4 to a valve 5. Subsequently the gaseous nitrogen passes through a line 6 into a nozzle 7, through which it enters the Freezer 10 - a spiral freezer is shown in the figure - is introduced.
  • nozzle 7 For the sake of clarity, only one nozzle 7 is shown in the figure; it is however, it goes without saying that a large number of nozzles are provided in practice can. These are preferably so-called flat nozzles for conveyor belt drying educated. If a transport system is provided within the freezer 10, it is expedient if the nozzles are aimed at this. It is important to ensure, that the materials used within the freezer in the immediate flow area of the warm gas can withstand the set gas temperatures.
  • a steam or gas heater 8 which is the Heating the gaseous nitrogen to the desired defrost temperature.
  • a controllable electric heater for example, is a controllable electric heater.
  • this is also conceivable for any other possibility of heating the Allows gas and / or gas mixture to the desired temperature.
  • the temperature of the Cooling system supplied warm gas and / or gas mixture by means of adjustable electric heater is controlled.
  • Gas (mixed) current should preferably be provided with a temperature sensor 9 become.
  • the defrost and drying gas or, of course, the nitrogen is produced in any other desired manner become.
  • nitrogen there are cryogenic, adsorptive and / or Membrane separation processes conceivable. It is also available in a storage container possible.

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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)
  • Freezing, Cooling And Drying Of Foods (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The freezer evaporator (10) has one or more injectors (7), provided with heating means (8) and thermostat (9), through which from a liquid nitrogen reservoir (1) is mixed with air and passed over the evaporator at water boiling point.

Description

Die Erfindung betrifft ein Verfahren zum Auftauen und Trocknen einer Kälteanlage, wie beispielsweise eines Frosters, insbesondere eines Spiralfrosters.The invention relates to a method for thawing and drying a refrigeration system, such as for example a freezer, especially a spiral freezer.

Bei einer Vielzahl von Kälteanlagen, wie beispielsweise Frostern jeder Art, die z. B. dem Frosten von Lebensmitteln dienen, kommt es - zumindest in einigen Bereichen der Kälteanlagen ― zu Vereisungen, Verschneiungen und/oder Verreifungen. Es ist deshalb erforderlich, daß derartige Anlagen in regelmäßigen Abständen aufgetaut, gereinigt und getrocknet werden.In a variety of refrigeration systems, such as freezers of any kind, the z. B. serve the freezing of food, it happens - at least in some areas of the refrigeration systems - for icing, snow-making and / or maturing. It is therefore it is necessary for such systems to be thawed at regular intervals, cleaned and dried.

Die bekannten Abtauverfahren, wie sie beispielsweise mittels geöffneter Türen oder dem Einlassen von kaltem Wasser realisiert werden, weisen jedoch ― zumindest teilweise ― nicht unerhebliche Nachteile auf. Werden Froster beispielsweise mit warmem Wasser aufgetaut, so kann dies mittelfristig zu einer Zerstörung der Isolation sowie diverser Teile, wie beispielsweise die Verbindung zweier Materialien mit unterschiedlichen Ausdehnungskoeffizienten, führen.The known defrosting methods, such as those using open doors or the intake of cold water can be realized, however - at least partially - not inconsiderable disadvantages. For example, become a freezer thawed warm water, this can destroy the insulation in the medium term as well as various parts, such as the connection of two materials with different expansion coefficients.

Das Trocknen von Frostern, die eine Fördereinrichtung aufweisen, wie dies beispielsweise bei den sog. Spiralfrostern der Fall ist, vor dem (Wieder-)Anfahren ist sinnvoll bzw. notwendig, da sich ansonsten beim Kaltfahren Eis auf dem Transportsystem bilden könnte, woraus wiederum große Probleme an dem Fördermechanismus resultieren können.Drying freezers that have a conveyor, such as this is the case with the so-called spiral freezers, before (restarting) it makes sense or necessary, otherwise there will be ice on the transport system when driving cold could form, which in turn creates major problems with the funding mechanism can result.

Es ist auch bereits vorgeschlagen worden, Umgebungsluft mittels eines Gebläses durch einen aufzutauenden Froster zu führen. Diese Verfahrensweise hat jedoch aus hygienischer Sicht eine Vielzahl von Nachteilen, welche dazu führen, daß der Froster hygienisch nicht sauber ist. Ferner ist eine Verfahrensweise bekannt, bei der die Atmosphäre in dem abzutauenden und zu trocknenden Froster mittels geeigneter Heizvorrichtungen erwärmt wird; die hierbei auftretenden hygienischen Probleme sind offensichtlich. It has also been proposed to use ambient air with a blower through a freezer to be defrosted. However, this procedure has ended hygienic view a variety of disadvantages, which lead to the freezer is not hygienically clean. Furthermore, a procedure is known in which the Atmosphere in the freezer to be defrosted and dried by means of suitable Heaters is heated; the hygienic problems that arise here obviously.

Aufgabe der vorliegenden Erfindung ist es, ein Verfahren zum Auftauen und Trocknen einer Kälteanlage, wie beispielsweise eines Frosters, anzugeben, mittels dessen die genannten Nachteile vermieden werden können. Insbesondere sollen die Abtaudauer sowie die Trockenzeit verringert werden; daneben sollen sämtliche hygienischen Anforderungen erfüllt werden.The object of the present invention is a method for thawing and drying a refrigeration system, such as a freezer, by means of which the mentioned disadvantages can be avoided. In particular, the defrost duration should as well as the drying time are reduced; next to all hygienic Requirements are met.

Dies wird erfindungsgemäß dadurch erreicht, daß zumindest der- oder diejenigen Bereiche der Kälteanlage, die Vereisungen, Verschneiungen und/oder Verreifungen aufweisen, mittels eines warmen Gases und/oder Gasgemisches gespült werden.This is achieved according to the invention in that at least one or those Areas of the refrigeration system, the icing, snow and / or frosting have to be flushed using a warm gas and / or gas mixture.

Hierbei werden als warmes Gas und/oder Gasgemisch vorzugsweise Stickstoff und/oder ein Stickstoff-reicher Strom eingesetzt. Die Temperatur des verwendeten Gases und/oder Gasgemisches beträgt wenigstens 100°C.Here, nitrogen is preferably used as the warm gas and / or gas mixture and / or a nitrogen-rich stream is used. The temperature of the used Gas and / or gas mixture is at least 100 ° C.

Durch die über das warme Gas und/oder Gasgemisch in die abzutauende Kälteanlage eingebrachte Wärmemenge kann ein schonendes, kontrolliertes und hygienisches Abtauen und Trocknen der Kälteanlage realisiert werden. Abhängig von der Reinheit des verwendeten Gases und/oder Gasgemisches kann der Anteil an in den Froster eingebrachten Fremdbestandteile, wie Mikroorganismen, minimiert werden. Wird beispielsweise gasförmiger Stickstoff mit einer Reinheit von mindestens 5.0 als Abtau- und Trockengas verwendet, so kann bei einer Temperatur von über 100°C das Einblasen einer absolut sauberen Atmosphäre gewährleistet werden.Through the warm gas and / or gas mixture into the refrigeration system to be defrosted The amount of heat introduced can be gentle, controlled and hygienic Defrosting and drying of the refrigeration system can be realized. Depending on the purity of the gas and / or gas mixture used can be the proportion of in the freezer introduced foreign components, such as microorganisms, are minimized. Becomes for example gaseous nitrogen with a purity of at least 5.0 as defrost and Dry gas is used, so at a temperature of over 100 ° C Blowing in an absolutely clean atmosphere can be guaranteed.

Warmer Stickstoff vermag darüber hinaus sehr viel Feuchtigkeit aufzunehmen. Dies ist insbesondere beim Trocknen von Fördersystemen, wie beispielsweise dem Band eines Spiralfrosters, von Vorteil. Nach Durchspülen der Kälteanlage bzw. derjenigen Bereiche der Kälteanlage, die getrocknet werden müssen, verläßt der Stickstoff die Kälteanlage wieder und nimmt dabei die Feuchtigkeit mit. Die Vorteile gegenüber dem bisherigen Trocknungsverfahren "Türen offen lassen" sind offensichtlich, da weder neuer Schmutz noch neue Mikroorganismen in die Kälteanlage gelangen können.Warm nitrogen can also absorb a lot of moisture. This is especially when drying conveyor systems, such as the belt one Spiral freezer, an advantage. After flushing the refrigeration system or those Areas of the refrigeration system that need to be dried leave the nitrogen Refrigeration system again and takes the moisture with it. The advantages over that previous drying processes "leave doors open" are obvious because neither new dirt or new microorganisms can get into the refrigeration system.

Selbstverständlich eignet sich auch erwärmte bzw. erhitzte Umgebungsluft als Abtau- und Trockengas. Unter Umständen kann es sinnvoll sein, daß die Umgebungsluft vor der Zuführung in die abzutauende Kälteanlage einer Reinigung ― beispielsweise einem Adsorptions- und/oder Filterprozeß ― unterworfen wird. Of course, heated or heated ambient air is also suitable as a defrost and Dry gas. Under certain circumstances, it may make sense that the ambient air in front the supply to the refrigeration system to be defrosted for cleaning - for example one Adsorption and / or filtering process - is subjected.

Das erfindungsgemäße Verfahren zum Auftauen und Trocknen einer Kälteanlage ermöglicht eine Verkürzung der Abtau- sowie der Trocknungsdauer und damit eine längere Betriebsdauer der jeweiligen Kälteanlage; darüber hinaus bringt es Verbesserungen in hygienischer Hinsicht mit sich.The method according to the invention for thawing and drying a refrigeration system enables a shortening of the defrosting and drying time and thus one longer operating time of the respective refrigeration system; beyond that it brings Hygienic improvements.

Das erfindungsgemäße Verfahren zum Auftauen und Trocknen einer Kälteanlage sowie weitere Ausgestaltungen desselben seien anhand des in der Figur dargestellten Ausführungsbeispiels näher erläutert.The method according to the invention for thawing and drying a refrigeration system and further refinements of the same are based on that shown in the figure Embodiment explained in more detail.

Aus einem Flüssigstickstoff-Tank 1 wird über Leitung 2 flüssiger Stickstoff entnommen und einem Verdampfer 3 zugeführt. Der verdampfte und damit gasförmige Stickstoff wird aus dem Verdampfer 3 über Leitung 4 einem Ventil 5 zugeführt. Anschließend gelangt der gasförmige Stickstoff über eine Leitung 6 in eine Düse 7, über die er in den Froster 10 ― in der Figur ist ein Spiralfroster dargestellt ― eingebracht wird.Liquid nitrogen is removed from a liquid nitrogen tank 1 via line 2 and supplied to an evaporator 3. The vaporized and thus gaseous nitrogen is fed from the evaporator 3 via line 4 to a valve 5. Subsequently the gaseous nitrogen passes through a line 6 into a nozzle 7, through which it enters the Freezer 10 - a spiral freezer is shown in the figure - is introduced.

Der Übersichtlichkeit halber ist in der Figur lediglich eine Düse 7 dargestellt; es ist jedoch selbstverständlich, daß in der Praxis eine Vielzahl von Düsen vorgesehen sein können. Diese sind vorzugsweise als sog. Flachdüsen für die Förderbandtrocknung ausgebildet. Sofern innerhalb des Frosters 10 ein Transportsystem vorgesehen ist, ist es zweckmäßig, wenn die Düsen auf dieses gerichtet sind. Es ist darauf zu achten, daß die innerhalb des Frosters verwendeten Materialien im unmittelbaren Strömungsbereich des warmen Gases den eingestellten Gastemperaturen widerstehen können.For the sake of clarity, only one nozzle 7 is shown in the figure; it is however, it goes without saying that a large number of nozzles are provided in practice can. These are preferably so-called flat nozzles for conveyor belt drying educated. If a transport system is provided within the freezer 10, it is expedient if the nozzles are aimed at this. It is important to ensure, that the materials used within the freezer in the immediate flow area of the warm gas can withstand the set gas temperatures.

Der Düse 7 vorgeschaltet ist ein Dampf- oder Gaserhitzer 8 vorgesehen, der der Erwärmung des gasförmigen Stickstoffes auf die gewünschte Abtautemperatur dient. Für die Erwärmung des über die Düse 7 in den Froster 10 eingeführten Abtau- und Trocknungsgases eignet sich beispielsweise eine regelbare elektrische Heizung. Denkbar hierfür ist jedoch auch jede andere Möglichkeit, die eine Erwärmung des Gases und/oder Gasgemisches auf die gewünschte Temperatur ermöglicht. Um Schäden an der abzutauenden Kälteanlage bzw. an der in ihr angeordneten Einrichtungen zu vermeiden, ist es ― gemäß einer vorteilhaften Ausgestaltung des erfindungsgemäßen Verfahrens ― zweckmäßig, wenn die Temperatur des der Kälteanlage zugeführten warmen Gases und/oder Gasgemisches mittels der regelbaren elektrischen Heizung gesteuert wird. Upstream of the nozzle 7 is a steam or gas heater 8, which is the Heating the gaseous nitrogen to the desired defrost temperature. For heating the defrost and introduced through the nozzle 7 into the freezer 10 Drying gas, for example, is a controllable electric heater. However, this is also conceivable for any other possibility of heating the Allows gas and / or gas mixture to the desired temperature. Around Damage to the refrigeration system to be defrosted or to the one arranged in it To avoid facilities, it is - according to an advantageous embodiment of the inventive method - useful if the temperature of the Cooling system supplied warm gas and / or gas mixture by means of adjustable electric heater is controlled.

Zum Zwecke der Regelung der Temperatur des aus der Düse 7 austretenden Gas(gemisch)stromes sollte vorzugsweise ein Temperatursensor 9 vorgesehen werden.For the purpose of regulating the temperature of the emerging from the nozzle 7 Gas (mixed) current should preferably be provided with a temperature sensor 9 become.

Über entsprechende Vorrichtungen 11 wird das Gemisch aus zugeführtem Gas und Frosteratmosphäre an die Umgebung abgegeben. Derartige Vorrichtungen in der richtigen Verschaltung verhindern zudem, daß bei begehbaren Kälteanlagen eine Gefährdung von Personen durch Sauerstoffmangel besteht.The mixture of supplied gas and Freezer atmosphere released to the environment. Such devices in the correct wiring also prevent that in walk-in refrigeration systems People are at risk from lack of oxygen.

Im Gegensatz zu der beschriebenen Darstellung kann das Abtau- und Trocknungsgas bzw. der Stickstoff selbstverständlich auf jede andere beliebige Art und Weise erzeugt werden. Im Falle des Stickstoffes sind hierbei kryogene, adsorptive und/oder Membrantrennverfahren denkbar. Auch die Bereitstellung in einem Speicherbehälter ist möglich.In contrast to the illustration described, the defrost and drying gas or, of course, the nitrogen is produced in any other desired manner become. In the case of nitrogen, there are cryogenic, adsorptive and / or Membrane separation processes conceivable. It is also available in a storage container possible.

Die Verwendung von Stickstoff oder eines Stickstoff-reichen Gasgemisches ― dies gilt selbstverständlich auch für andere Inertgas(gemische) ― als Abtau- und Trocknungsgas hat durch die Inertisierung auch den Vorteil, daß die Anwesenheit von Kleinstlebewesen, wie beispielsweise Mäusen, Fröschen, Ratten, etc., verhindert wird.The use of nitrogen or a nitrogen-rich gas mixture - this applies of course also for other inert gases (mixtures) - as defrosting and drying gas has the advantage of inerting that the presence of microorganisms, such as mice, frogs, rats, etc. is prevented.

Claims (6)

Verfahren zum Auftauen und Trocknen einer Kälteanlage, wie beispielsweise eines Frosters, dadurch gekennzeichnet, daß zumindest der- oder diejenigen Bereiche der Kälteanlage, die Vereisungen, Verschneiungen und/oder Verreifungen aufweisen, mittels eines warmen Gases und/oder Gasgemisches gespült werden.Method for thawing and drying a refrigeration system, such as a freezer, characterized in that at least one or those areas of the refrigeration system which have icing, snow-making and / or maturing are flushed using a warm gas and / or gas mixture. Verfahren zum Auftauen und Trocknen einer Kälteanlage nach Anspruch 1, dadurch gekennzeichnet, daß das warme Gas und/oder Gasgemisch Stickstoff und/oder ein Stickstoff-reicher Strom ist.Method for thawing and drying a refrigeration system according to claim 1, characterized in that the warm gas and / or gas mixture nitrogen and / or is a nitrogen-rich stream. Verfahren zum Auftauen und Trocknen einer Kälteanlage nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Temperatur des der Kälteanlage zugeführten warmen Gases und/oder Gasgemisches wenigstens 100 °C beträgt.Method for thawing and drying a refrigeration system according to claim 1 or 2, characterized in that the temperature of the supplied to the refrigeration system warm gas and / or gas mixture is at least 100 ° C. Verfahren zum Auftauen und Trocknen einer Kälteanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Kälteanlage während und/oder nach dem Zuführen des warmen Gases und/oder Gasgemisches entlüftet bzw. das Gas und/oder Gasgemisch während und/oder nach dem Zuführen aus der Kälteanlage abgeführt wird.Method for thawing and drying a refrigeration system according to one of the preceding Claims, characterized in that the refrigeration system during and / or after supplying the warm gas and / or gas mixture vented or the gas and / or gas mixture during and / or after Feed is discharged from the refrigeration system. Verfahren zum Auftauen und Trocknen einer Kälteanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Temperatur des der Kälteanlage zugeführten Gases und/oder Gasgemisches geregelt wird.Method for thawing and drying a refrigeration system according to one of the preceding Claims, characterized in that the temperature of the Refrigeration system supplied gas and / or gas mixture is regulated. Verfahren zum Auftauen und Trocknen einer Kälteanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das der Kälteanlage zugeführte warme Gas und/oder Gasgemisch durch Verdampfen einer Flüssigkeit bzw. Flüssigkeitsmischung erzeugt wird.Method for thawing and drying a refrigeration system according to one of the preceding Claims, characterized in that the refrigeration system supplied warm gas and / or gas mixture by evaporating a liquid or liquid mixture is generated.
EP00107590A 1999-04-30 2000-04-07 Method for defrosting and drying of refrigeration installations Expired - Lifetime EP1048911B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19919935 1999-04-30
DE19919935A DE19919935A1 (en) 1999-04-30 1999-04-30 Process for thawing and drying refrigeration systems

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EP1048911A1 true EP1048911A1 (en) 2000-11-02
EP1048911B1 EP1048911B1 (en) 2003-06-18

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AT (1) ATE243308T1 (en)
DE (2) DE19919935A1 (en)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210111566A (en) * 2020-03-03 2021-09-13 (주)발맥스기술 System and method for recycle of refrigerants in charging equipment of LNG

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991007994A1 (en) * 1989-11-29 1991-06-13 Frigoscandia Food Process Systems Ab Method for preventing bacterial growth in a food processing plant and such a plant for carrying out the method
GB2249534A (en) * 1990-09-06 1992-05-13 Leek Brian Cleaning apparatus for endless conveyors.
US5349828A (en) * 1993-09-17 1994-09-27 The Boc Group, Inc. Conveyor belt cleaning apparatus for food freezing

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3830078A (en) * 1970-03-24 1974-08-20 Us Air Force Anti-frost apparatus
US4072488A (en) * 1976-12-10 1978-02-07 Kysor Industrial Corporation Air defrost reach-in refrigerated display cabinet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991007994A1 (en) * 1989-11-29 1991-06-13 Frigoscandia Food Process Systems Ab Method for preventing bacterial growth in a food processing plant and such a plant for carrying out the method
GB2249534A (en) * 1990-09-06 1992-05-13 Leek Brian Cleaning apparatus for endless conveyors.
US5349828A (en) * 1993-09-17 1994-09-27 The Boc Group, Inc. Conveyor belt cleaning apparatus for food freezing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210111566A (en) * 2020-03-03 2021-09-13 (주)발맥스기술 System and method for recycle of refrigerants in charging equipment of LNG

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PL194383B1 (en) 2007-05-31
EP1048911B1 (en) 2003-06-18
PL339423A1 (en) 2000-11-06
DE50002573D1 (en) 2003-07-24
DE19919935A1 (en) 2000-11-02
ATE243308T1 (en) 2003-07-15

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