EP3049738A1 - Procédé pour le dégivrage d'un agencement de refroidissement de gaz d'un congélateur - Google Patents

Procédé pour le dégivrage d'un agencement de refroidissement de gaz d'un congélateur

Info

Publication number
EP3049738A1
EP3049738A1 EP14776626.5A EP14776626A EP3049738A1 EP 3049738 A1 EP3049738 A1 EP 3049738A1 EP 14776626 A EP14776626 A EP 14776626A EP 3049738 A1 EP3049738 A1 EP 3049738A1
Authority
EP
European Patent Office
Prior art keywords
gas cooling
cooling arrangement
sound
frost
sound pulse
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Withdrawn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
EP14776626.5A
Other languages
German (de)
English (en)
Inventor
Johan SILJEBORN
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.)
John Bean Technologies AB
Original Assignee
John Bean Technologies AB
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 John Bean Technologies AB filed Critical John Bean Technologies AB
Publication of EP3049738A1 publication Critical patent/EP3049738A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F25D21/06—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
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/02—Detecting the presence of frost or condensate
    • 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
    • F25D21/025—Detecting the presence of frost or condensate using air pressure differential detectors

Definitions

  • the invention relates to a method for defrosting a gas cooling arrangement of a freezer.
  • the invention also relates to a freezer system.
  • the invention also relates to a defroster for defrosting a gas cooling arrangement of a freezer.
  • freezers adapted to freeze different kinds of products.
  • One group of such products is e.g. food products, including e.g. bread pieces, minced meat patties, and packed ready-meals.
  • the air flow may have different intensities.
  • the air flow may be anything from a gentle flow of air to a strong flow of air adapted to break the boundary layer of air around the product. The latter is called impingement freezing.
  • a freezer blowing cold air past the product to be frozen it is common to use one or more fans transporting the air past the product and past one or more gas cooling arrangements in which the gas is cooled.
  • One commonly used gas cooling arrangement is the use of an evaporator in which a refrigerant is evaporated. The evaporation cools the evaporator and thereby the air passing the evaporator is cooled.
  • the evaporators are often also referred to as cooling battery.
  • frost reduces the heat transfer between the air and the gas cooling arrangement, thereby reducing the gas cooling arrangements' efficiency in cooling the air passing the gas cooling arrangement.
  • the deposition of frost may also geometrically change the air passages designed for efficient flow of air through or past the gas cooling arrangement, which in turn may increase the air pressure drop over the gas cooling arrangement.
  • Another method of defrosting the cooling battery entails the use of a number of air nozzles which is adapted to be recurrently directed towards and brought to sweep over the cooling batteries in order to blow away the frost deposit from the cooling batteries by means of a directed flow of compressed air.
  • One such apparatus is disclosed in US 4 528 820.
  • One drawback with this defrosting apparatus is that the cooling battery and surrounding parts of the freezer must be designed such that the air nozzles can be moved along and get access to all parts of the cooling battery. There is also a risk that the cooling battery is damaged by the flow of compressed air. There is also a risk that the moving components of the air defroster break down or freeze stuck.
  • the air defroster also entails the addition of substantial amounts of air which need to be cleaned and which introduces heat into the freezer.
  • Another way of attacking the frost formation problem is to remove the water before it forms frost on the cooling battery.
  • One way according to this principle is to provide an air-dehumidifier generally lowering the content of water vapour in the air.
  • This entails a separate apparatus, thereby increasing the cost of the freezer.
  • the product to be frozen often also adds water vapour to the cooling air being circulated over and over in the freezer.
  • a cooling battery accumulating frost in one sense is a highly efficient dehumidifier, it is difficult and costly to provide a dehumidifier which removes the problem of frost deposition on the cooling battery.
  • JP 2010-048484 Another way of removing the water before it is deposited as frost is disclosed in JP 2010-048484.
  • the document discloses a method and a system for removing condensed water droplets from e.g. a fin of a heat exchanger. By removing condensed water droplets before they freeze, frost formation is reduced.
  • a sound generator is used to generate a standing acoustic wave.
  • the standing acoustic wave comprises nodes, having a minimum amplitude, and anti-nodes, having a maximum amplitude.
  • condensed water droplets are moved to a position of a node of the standing wave. By doing this the condensed water droplets on the heat exchanger can be moved and thus concentrated to specific locations, i.e. the locations of the nodes.
  • portions of the heat exchanger not corresponding to positions of the nodes of the standing wave will have a reduced amount of condensed water droplets.
  • ice formation can be reduced or concentrated to the positions of the nodes of the standing wave.
  • JP 2010-048484 it is proposed to sweep the frequency used to alter the positions of the nodes of the standing wave, and thereby move the water droplets along e.g. a fin of a heat exchanger.
  • Another strategy described, for achieving the same result is to physically move the sound source to alter said positions of the nodes.
  • a third strategy proposed is to use an high amplitude sound wave to move said droplets away from the sound source used. This approach is, however, complicated and difficult to realise. First of all you have to find the resonance frequency in order to establish a standing wave. Secondly, one have to move the sound wave nodes sufficiently fast to remove the water droplets before they freeze into ice. Thirdly, if any ice anyhow is formed on the heat exchanger, the
  • US 2007/0039344 discloses a method and apparatus for removing excess moisture from evaporator coils of e.g. an air- conditioning system.
  • the moisture is removed from the evaporator coils by vibrating the coils.
  • the coils may be vibrated by mechanical or acoustic devices such as solenoid plungers and acoustic transducers.
  • US 2007/0039344 does not address or even mention a problem with frost deposition. It may be noted that US 2007/0039344 relates to an air- conditioning apparatus in which frost deposition is not an issue at all.
  • JP 408327288 discloses a heat pump air conditioning system with two evaporators, one indoor heat exchanger and one outdoor heat exchanger. Two sound generators are used to generate vibrations on the outdoor heat exchanger used as a condenser in an air conditioning system.
  • the outdoor heat exchanger forms a condenser in the system.
  • a first of the sound generators is attached to the frame to induce vibrations to the fins of the outdoor heat exchanger and the second sound generator is attached to the tubing to induce vibrations to the tubing of the system.
  • the vibrations of the fins will cause the air stream passing the fins to vibrate in order to promote destruction of a boundary layer in order to achieve an improvement in heat exchanging efficiency. It is also briefly discussed how the vibration of the air stream have certain effects during a heating period when the system is run in the opposite direction, in a heating mode.
  • the sound generator is installed in the inflow side of the air in order to add vibrations to the fins of the outdoor heat exchanger and to remove dew condensation and frost promptly.
  • the second sound generator will cause vibrations to propagate and to break the boundary layer between the liquid phase and gas phase of the medium in the tube.
  • a further object of the invention is to provide a freezer system provided with a defroster.
  • a further object of the invention is to provide a defroster for defrosting a gas cooling arrangement of a freezer.
  • a first aspect of the invention it relates to a method for defrosting a gas cooling arrangement of a freezer, the gas cooling
  • removing the frost may e.g. be performed by the sound pulse cracking or breaking the frost which then e.g. may fall of the gas cooling arrangement due to the gravity.
  • the sound pulse may e.g. also collapse the boundary layer close to the gas cooling arrangement surface and thereby facilitate the normal airflow of the gaseous medium passing the gas cooling arrangement to blow away frost particles from the gas cooling arrangement surface.
  • the design with a sound pulse removing the frost is a good solution since the gas cooling arrangement may be designed as a compact unit without having to consider how to provide access to a system with air jet nozzles or the like. This also makes it possible to fit a sound pulse defroster to many of the existing freezers. Moreover, there is no significant risk that the sound pulse damages the gas cooling arrangement.
  • the invention is especially suitable for applications where the gas cooling arrangement is adapted to cool a gaseous medium passing the gas cooling arrangement to a temperature of below 0°C. Such applications are especially prone to result in a frost development on the gas cooling
  • the sound pulse may be generated with a frequency below 300 Hz, preferably between 10-250 Hz, more preferably between 150-250 Hz.
  • a frequency below 300Hz is considered suitable since the relatively long wave length of the vibration of the air is considered suitable to break up frost formed on the gas cooling arrangement.
  • the wave length will be more than a meter in length and the sound pulse will propagate past the gas cooling arrangement without being attenuated to any significant extent, i.e. the energy put into the sound pulse will effectively be transmitted to the frost and gas cooling arrangement throughout the gas cooling arrangement.
  • the long wave length will decrease the risk of the formation of "dead points" not affected by the sound pulse.
  • the sound pulse may be generated with a duration between 1 and 15 seconds, preferably between 1 and 10 seconds, more preferably between 2 and 4 seconds. If the sound pulse is too short there is a risk that the frost will not be removed to satisfactory degree e.g. due to that cracks in the frost will not have time to form and to propagate. On the other hand an excessively long sound pulse will not remove significantly more frost (if any) than a sound pulse of limited duration. Most of the frost will be removed quickly since the sound pulse will effectively introduce a vibratory energy to the air, the frost and the gas cooling arrangement, which energy will quickly break the frost in pieces and from the gas cooling arrangement.
  • the sound pulse may be generated at predetermined time intervals. This is a simple way of controlling the defrosting action. Moreover, if the sound pulse is generated using a sound horn which uses compressed air, this predetermined time interval makes the consumption of compressed air well defined.
  • the sound pulse may be generated at intervals based on current amount of frost on said gas cooling arrangement. This way it is possible to generate the sound pulses such that the gas cooling arrangement may perform at its best. This may e.g. be done when the amount of frost reaches a certain level where the gas cooling arrangement otherwise would have a heat exchange effectiveness falling below a desired level. This may e.g. be done when the amount of frost reaches a certain level where the frost is especially effectively affected by the sound pulse used.
  • the current amount of frost may e.g. be determined by analyzing an image of the gas cooling arrangement and/or by measuring the differential pressure over the gas cooling
  • intervals are set to be at most ten times an hour. This is considered an upper limit from a working environment point of view.
  • the sound pulse is preferably directed towards said gas cooling arrangement. This way the energy of the sound pulse is effectively
  • the sound pulse exhibit preferably a sound pressure level (SPL) at said gas cooling arrangement of 100-160 dB S pi_, preferably 120-150 dB S PL- This is a pressure level that will effectively remove frost but will still be at an acceptable level outside the housing of the freezer.
  • SPL sound pressure level
  • a freezer system comprised in a housing, comprising:
  • a sound generator arranged to generate a sound pulse and to subject said gas cooling arrangement to said sound pulse such that an amount of frost formed on said gas cooling arrangement is reduced by removing frost formed on said gas cooling arrangement by means of sound energy in said sound pulse.
  • removing the frost may e.g. be performed by the sound pulse cracking or breaking the frost which then e.g. may fall of the gas cooling arrangement due to the gravity.
  • the sound pulse may e.g. also collapse the boundary layer close to the gas cooling arrangement surface and thereby facilitate the normal airflow of the gaseous medium passing the gas cooling arrangement to blow away frost particles from the gas cooling arrangement surface.
  • the design with a sound pulse removing the frost is a good solution since the gas cooling arrangement may be designed as a compact unit without having to consider how to provide access to a system with air jet nozzles or the like. This also makes it possible to fit a sound pulse defroster to many of the existing freezers. Moreover, there is no significant risk that the sound pulse damages the gas cooling arrangement.
  • the sound pulse generator may effectively transmit the sound pulse to the gas cooling arrangement and some of the energy of the sound pulse will be the attenuated by the housing.
  • the sound generator preferably comprises a sound horn powered by compressed air.
  • a sound horn is capable of producing a sound pulse with a significant sound energy capable of breaking the frost on the gas cooling arrangement.
  • compressed air is commonly used for other purposes in e.g. food production plants, i.e. there is most often already a supply of compressed air.
  • a defroster for defrosting a gas cooling arrangement of a freezer comprising:
  • a sound generator arranged to generate a sound pulse and to subject said gas cooling arrangement to said sound pulse such that an amount of frost formed on said gas cooling arrangement is reduced by removing frost formed on said gas cooling arrangement by means of sound energy in said sound pulse.
  • removing the frost may e.g. be performed by the sound pulse cracking or breaking the frost which then e.g. may fall of the gas cooling arrangement due to the gravity.
  • the sound pulse may e.g. also collapse the boundary layer close to the gas cooling arrangement surface and thereby facilitate the normal airflow of the gaseous medium passing the gas cooling arrangement to blow away frost particles from the gas cooling arrangement surface.
  • the design with a sound pulse removing the frost is a good solution since the gas cooling arrangement may be designed as a compact unit without having to consider how to provide access to a system with air jet nozzles or the like. This also makes it possible to fit a sound pulse defroster to many of the existing freezers. Moreover, there is no significant risk that the sound pulse damages the gas cooling arrangement.
  • the method, the freezer and the defroster are especially suitable for embodiments where the freezer is adapted to freeze food products.
  • the defrosting action is controlled and it requires no additional media, such as liquids or other gases.
  • the method, the freezer and the defroster are considered especially suitable for embodiments where gaseous medium which passes the gas cooling arrangement and which is adapted to cool the product is air.
  • the sound pulse may e.g. be generated by a sound horn to which compressed air is supplied.
  • Fig 1 schematically shows a cross-section of a freezer provided with a defroster according to the invention, the freezer being provided with a product path extending in an essentially straight line through the freezer.
  • Fig 2 schematically shows a cross-section of a freezer provided with a defroster according to the invention, the freezer being provided with a product path extending in a helical path inside the freezer.
  • Fig 3a and fig 3b schematically illustrate the method according to the invention.
  • fig 3a the cooling of the gaseous medium continues during defrosting and in fig 3a the cooling of the gaseous medium is temporarily discontinued during the defrosting of the gas cooling arrangement.
  • the freezer is provided with an insulated housing 1 , having walls 1 a, 1 b, a floor 1 c and a roof 1 d.
  • a conveyor 2 extends from an inlet opening in the front wall to an outlet opening in the back wall.
  • Air is circulated inside housing 1 using a fan 3.
  • the air circulated inside the housing 1 is cooled by a cooling battery comprising two gas cooling arrangements 4a and 4b (denoted in common as 4).
  • the arrangements is formed of two evaporators.
  • the flow path of the air is generally indicated by the white arrows.
  • the fan pressurises the chamber directly above the conveyor and the air flows generally downwardly towards the conveyor 2. After passing the conveyor 2 and thereby cooing the product on the conveyor 2, the air flows to the sides and then upwardly along the sides towards the two gas cooling arrangements 4a-b.
  • the air passes the two gas cooling arrangements 4 in an upwardly directed generally vertical flow. After passing the gas cooling arrangements 4, the air is drawn to the centre by the fan 3.
  • the freezer of this embodiment is provided with an insulated housing 1 , having walls 1 a, 1 b, a floor 1 c and a roof 1d.
  • a conveyor 2 extends from an inlet opening in the wall 1 b two an outlet opening in the wall 2b (as indicated by the grey arrows in the conveyor 2), or alternatively the conveyor 2 runs in the opposite direction.
  • the conveyor 2 extends during a major part of its extension in a helical path forming a stack 2b.
  • the stack 2b may be so-called self- supporting where on turn of the conveyor carries the turn immediately above said turn.
  • the stack 2b may also be supported partly or fully by a still standing framework or by a rotating drum.
  • Such different kinds of stacks of helically extending conveyors are well-known in the art.
  • Air is circulated inside housing 1 using a fan 3.
  • the air circulated inside the housing 1 is cooled by a cooling battery comprising a number of gas cooling arrangements 4.
  • the gas cooling arrangements is formed of two evaporators.
  • the flow path of the air is generally indicated by the white arrows.
  • the fan 3 draws air upwardly to the upper portion of the stack 2b.
  • the air passes down through the conveyor 2 and is then drawn to the side and upwardly through the gas cooling arrangement 4.
  • the air passes the gas cooling arrangement 4 in an upwardly directed generally vertical flow.
  • the gas cooling arrangements 4 form part of a cooling system which is well-known in the art. Basically the gas cooling arrangements 4 are formed of a great number of tubes or pathways in which a cooling medium is allowed to be evaporated. The evaporation of the cooling medium inside the tubes or pathways requires heat and this heat is drawn from the air passing the gas cooling arrangement.
  • the tubes are arranged in rows and are provided with or attached to fins, or are formed as pathways between plates.
  • the arrangement used for cooling a gaseous medium, such as air, passing the gas cooling arrangement, basically forms a lamellar structure with pathways for the gaseous medium through the gas cooling arrangement.
  • the pathways may be closed or may be in communication with each other along their extension through the gas cooling arrangement.
  • air is circulated through the gas cooling arrangement, water vapour in the air will condensate and freeze on the gas cooling arrangement thereby forming frost on the gas cooling arrangement.
  • the frost will e.g. increase the pressure drop over the gas cooling arrangement, e.g. due to a decrease in the available flow area and due to deteriorated flow conditions.
  • the freezers are also provided with a sound generator 5.
  • the sound generator 5 is adapted to generate a sound pulse in order to subject the gas cooling arrangement 4 to said sound pulse such that an amount of frost formed on the gas cooling arrangement 4 is reduced by removing frost formed on the gas cooling arrangement 4 by means of sound energy in said sound pulse.
  • the sound generator 5 may e.g. be a so-called sound horn which is driven by compressed air.
  • the sound generator 5 is connected to a pressure vessel 6 which in turn is connected to a compressor or a supply 7 of pressurised air. Between the pressure vessel 6 and the sound generator 5 there is arranged a control valve 8 and a pressure regulator 9. The exact configuration of the valves/regulators may be varied.
  • the sound generator 5 is adapted to generate a sound pulse with a frequency below 300 Hz.
  • the frequency is between 10-300Hz.
  • the frequency is between 10-250 Hz.
  • the frequency is between 10-150 Hz.
  • the frequency is between 50-300Hz.
  • the frequency is between 50-200 Hz.
  • the frequency is between 50-150 Hz.
  • the frequency is between 150-250 Hz.
  • the sound generator is adapted to generate a sound pulse with a duration between 1 and 15 seconds.
  • the duration is between 1 and 10seconds.
  • the duration is between 2 and 15 seconds.
  • the duration is between 2 and 10 seconds.
  • the duration is between 1 and 4 seconds.
  • the duration is between 2 and 4 seconds.
  • the duration is between 1 and 5 seconds.
  • the duration is between 1 and 3 seconds.
  • the sound generator 5 is adapted to generate a sound pulse at predetermined time intervals.
  • the sound pulse is generated at intervals based on current amount of frost on said gas cooling arrangement.
  • Current amount of frost may e.g. be determined by analyzing an image of the gas cooling arrangement or by measuring the differential pressure over the gas cooling arrangement.
  • the intervals set to be at most ten times an hour.
  • the total duration of the sound pulses accounts to less than 10% of the total time the freezer is running.
  • the sound generator is adapted to generate a sound pulse exhibiting a sound pressure level (SPL) at said gas cooling arrangement of 100-160 dBspL, preferably 120-150 dB S pL- According to one embodiment the pressure level at the gas cooling arrangement is 100-150 dB S pL- According to one embodiment the pressure level at the gas cooling arrangement is 120-160 dBsPL-
  • the sound generator 5 is adapted to generate a sound pulse which is directed towards said gas cooling arrangement 4 (as indicated by the black arrows).
  • the sound generator 5 is arranged separately from the gas cooling arrangement 4 and at a distance from the gas cooling arrangement 4.
  • the sound pulse will travel in the air from the sound generator towards the gas cooling arrangement.
  • the distance is at least 0.5m.
  • the distance is at least 1 m. The distance between the sound generator 5 and the gas cooling
  • the sound generator 5 is adapted to generate a sound pulse directed towards the gas cooling arrangements 4.
  • the sound generator 5 is adapted to generate a sound pulse travelling in an upwardly generally vertical direction. This direction is the same as the air is travelling through the gas cooling arrangement 4. According to one embodiment it may be said that the sound generator 5 is adapted to generate a sound pulse travelling in the same direction through the gas cooling arrangement 4 as the direction in which the gaseous medium to be cooled passes through the gas cooling arrangement. If this direction is vertically upward, one advantage is that the pathways allowing the upward flow of air will most likely also allow frost to fall downwardly due to the gravity.
  • the sound generators 5 are of the kind being essentially funnel shaped and being provided with a sound generating membrane 10.
  • the sound generators 5 are adapted to be placed such that the membrane 10 of respective sound generator 5 is placed on the outside of the housing 1 d and such that the funnel shaped part of respective sound generator extends into the housing. This minimizes the risk of the sound generator being subjected to frost deposition.

Landscapes

  • 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)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)

Abstract

La présente invention concerne un dégivreur (5-10) pour le dégivrage d'un agencement de refroidissement de gaz (4) d'un congélateur, comportant un générateur de sons (5) agencé pour générer une impulsion sonore et pour soumettre ledit agencement de refroidissement de gaz (4) à ladite impulsion sonore de sorte que la quantité de givre formé sur ledit agencement de refroidissement de gaz (4) soit réduite par l'élimination du givre formé sur ledit agencement de refroidissement de gaz (4) au moyen d'énergie sonore dans ladite impulsion sonore. La présente invention concerne également un système de congélateur comportant un tel dégivreur (5-10) et un agencement de refroidissement de gaz (4). La présente invention concerne en outre un procédé de dégivrage d'un agencement de refroidissement de gaz (4) d'un congélateur.
EP14776626.5A 2013-09-25 2014-09-24 Procédé pour le dégivrage d'un agencement de refroidissement de gaz d'un congélateur Withdrawn EP3049738A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1351102 2013-09-25
PCT/EP2014/070330 WO2015044178A1 (fr) 2013-09-25 2014-09-24 Procédé pour le dégivrage d'un agencement de refroidissement de gaz d'un congélateur

Publications (1)

Publication Number Publication Date
EP3049738A1 true EP3049738A1 (fr) 2016-08-03

Family

ID=51626023

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14776626.5A Withdrawn EP3049738A1 (fr) 2013-09-25 2014-09-24 Procédé pour le dégivrage d'un agencement de refroidissement de gaz d'un congélateur

Country Status (3)

Country Link
US (1) US20160223246A1 (fr)
EP (1) EP3049738A1 (fr)
WO (1) WO2015044178A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6617019B2 (ja) * 2015-12-22 2019-12-04 株式会社前川製作所 熱交換器及び熱交換器の除霜方法
US10739056B2 (en) * 2016-10-17 2020-08-11 Messer Industries Usa, Inc. Snow and ice removal for impinger
KR20190090733A (ko) * 2019-06-12 2019-08-02 엘지전자 주식회사 음향재생이 가능한 냉장고

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1979001019A1 (fr) * 1978-05-02 1979-11-29 Kockums Automation Procede de nettoyage sonique

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101747A (en) * 1976-01-30 1978-07-18 Ranco Incorporated Differential pressure operated switch
DE2720922A1 (de) * 1977-05-10 1978-11-16 Teichmann & Mevs Verfahren und vorrichtung zum automatischen abtauen von kaelteaggregaten
US4299095A (en) * 1979-08-13 1981-11-10 Robertshaw Controls Company Defrost system
JPH08327288A (ja) * 1995-05-30 1996-12-13 Sharp Corp 熱交換器
US7934384B2 (en) * 2004-10-22 2011-05-03 General Mills, Inc. Portable cooled merchandizing unit with customer enticement features
US7269967B2 (en) * 2005-08-22 2007-09-18 Gas Technology Institute Method and apparatus for removing moisture from evaporator coils
US20070169630A1 (en) * 2006-01-20 2007-07-26 David Auyoung Thermal processing chamber and conveyor belt for use therein and method of processing product
JP4816696B2 (ja) * 2008-08-22 2011-11-16 三菱電機株式会社 熱交換器
EP3779335B1 (fr) * 2010-02-23 2023-04-26 LG Electronics Inc. Réfrigérateur

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1979001019A1 (fr) * 1978-05-02 1979-11-29 Kockums Automation Procede de nettoyage sonique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2015044178A1 *

Also Published As

Publication number Publication date
WO2015044178A1 (fr) 2015-04-02
US20160223246A1 (en) 2016-08-04

Similar Documents

Publication Publication Date Title
KR20010041407A (ko) 물 생성 장치
US20160223246A1 (en) Method for defrosting a gas cooling arrangement of a freezer
US4570447A (en) Removing frost deposits from cooling-coil batteries in a freezing plant during operation
JP2013514511A (ja) 人工雪生成装置
KR101031416B1 (ko) 냉각 장치
CN101675305A (zh) 空调和空调控制方法
JP4816696B2 (ja) 熱交換器
WO2013020579A1 (fr) Dispositif d'échangeur thermique autonettoyant
CN108351150A (zh) 具有防霜换热器的空气温度调节系统
US10739056B2 (en) Snow and ice removal for impinger
CN107328149A (zh) 用于速冻、冷藏的翅管式换热器阵列式超声波防除霜技术
JP4081507B1 (ja) 冷却装置
US10605546B2 (en) Heat exchanger
CN114518004B (zh) 一种冲击式隧道速冻装置及速冻方法
US20110011097A1 (en) Device and Method for Chilling or Deep-Freezing Food Products by Impacting Jets
RU2005132791A (ru) Установка для очистки поверхности
CN209341657U (zh) 一种小型渔船用速冻柜
JP3973429B2 (ja) 冷凍装置
JP4889747B2 (ja) 熱交換器及びこれを備えた空気調和機
WO2011115626A1 (fr) Système et procédé de dégivrage par ondes de choc à air
WO1990005277A1 (fr) Procede et agencement permettant une transmission thermique forcee entre des corps alimentaires et des gaz
JP2017116134A (ja) 熱交換器及び熱交換器の除霜方法
CN206160330U (zh) 一种蒸发冷凝无油空调系统
JP3891668B2 (ja) 空気清浄冷却設備
CN105026857A (zh) 冰箱

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20160422

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAX Request for extension of the european patent (deleted)
RIC1 Information provided on ipc code assigned before grant

Ipc: B08B 7/02 20060101ALI20180523BHEP

Ipc: F28F 17/00 20060101ALI20180523BHEP

Ipc: F25D 21/06 20060101ALI20180523BHEP

Ipc: F25D 21/02 20060101AFI20180523BHEP

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20180704

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20181115