US20060242973A1 - Refrigeration device and operating method for the same - Google Patents

Refrigeration device and operating method for the same Download PDF

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Publication number
US20060242973A1
US20060242973A1 US10/551,561 US55156104A US2006242973A1 US 20060242973 A1 US20060242973 A1 US 20060242973A1 US 55156104 A US55156104 A US 55156104A US 2006242973 A1 US2006242973 A1 US 2006242973A1
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US
United States
Prior art keywords
evaporator
temperature sensors
inner chamber
temperature
refrigeration device
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.)
Abandoned
Application number
US10/551,561
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English (en)
Inventor
Ilias Manettas
Georg Strauss
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete 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 BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Assigned to BSH BOSCH UND SIEMENS HAUSGERATE GMBH reassignment BSH BOSCH UND SIEMENS HAUSGERATE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: STRAUSS, GEORG, MANETTAS, ILIAS
Publication of US20060242973A1 publication Critical patent/US20060242973A1/en
Abandoned 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
    • F25D21/02—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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/11—Sensor to detect if defrost is necessary
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2117—Temperatures of an evaporator
    • F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
    • F25B2700/21173—Temperatures of an evaporator of the fluid cooled by the evaporator at the outlet
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/10—Sensors measuring the temperature of the evaporator

Definitions

  • the present invention relates to a refrigeration device with a thermally insulating housing enclosing an inner chamber and an evaporator arranged in the housing.
  • Moisture from the inner chamber, which forms an ice layer over time which in turn thermally insulates the evaporator from the inner chamber to be cooled, condenses on this evaporator during operation of the refrigeration device.
  • This insulation impairs the efficiency of the refrigeration device, so that the ice layer must be thawed from time to time to maintain efficient operation of the refrigeration device.
  • Every defrosting procedure is associated with input of heat into the refrigeration device, which, when normal operation of the device is resumed, must be drawn off and thus likewise impairs the energy balance of the device. Excessively frequent defrosting is thus as ineffective as excessively infrequent defrosting.
  • the object of the invention is to provide a refrigeration device, which enables reliable assessment of the quantity of ice accumulated on an evaporator with simple and robust means, and an operating mode for such a refrigeration device.
  • the invention utilises the change in temperature distribution in the vicinity of the evaporator resulting from the presence of an ice layer. If the evaporator is ice-free, this results in an extensively unhindered flow of heat in the vicinity of the evaporator, the temperature gradient is relatively flat, and the difference between the temperatures detected by the two sensors is minimal. If the heat flow is hampered by an ice layer, however, the result is a relatively steep temperature gradient in the ice layer, leading to greater differences between the temperatures detected by the two sensors, than when both sensors are ice-free.
  • One of the temperature sensors in particular can be placed directly on the surface of the evaporator and the other at a distance from the surface. This ensures that at least the first one will react very quickly to a change in temperature of the evaporator, which occurs whenever the evaporator begins to be supplied with coolant again after a standing phase.
  • the invention is applicable to refrigeration devices with an evaporator arranged directly in the inner chamber or in thermal contact with the latter.
  • the output signal delivered by the monitoring circuit can however be used in such a refrigerating device to control a display which advises a user of the necessity for defrosting.
  • a preferred application of the invention is a no-frost refrigeration device, that is, refrigeration devices, in which the evaporator is placed in a channel communicating with the inner chamber and in this channel can be warmed for defrosting, without the inner chamber necessarily having to be warmed also.
  • one of the temperature sensors is preferably placed on the surface of the evaporator and the other is placed on an output of the channel terminating in the inner chamber.
  • FIG. 1 shows a schematic section through a refrigeration device according to a first embodiment of the invention
  • FIG. 2 shows the dependence of the temperature difference detected by the sensors on the thickness of the ice layer on the evaporator in the embodiment of FIG. 1 ;
  • FIG. 3 shows a schematic detail of a second embodiment of an inventive refrigeration device
  • FIG. 4 shows the correlation between ice layer thickness and temperature difference according to the second embodiment.
  • FIG. 1 shows a sketch of a no-frost refrigeration device according to a first embodiment of the invention.
  • the refrigeration device conventionally comprises a thermally-insulating housing 1 , in which an inner chamber 2 for receiving cool goods and an evaporator chamber 5 separated from the inner chamber 2 by a partition 3 , is formed by openings 4 in the partition 3 communicating with the inner chamber 2 .
  • a plate-like evaporator 7 supplied with coolant by a refrigerating machine 6 and, in close contact with the latter, a defrosting unit 8 .
  • the evaporator chamber 5 and the openings 4 are designated jointly also as air duct.
  • a monitoring circuit 10 controls operation of the refrigerating machine 6 and a ventilator 11 arranged on the upper opening 4 by means of a measuring signal by a (not shown) temperature sensor in the inner chamber 2 .
  • Refrigerating machine 6 and ventilator 11 can in each case be run at the same time; it is preferred to switch the ventilator 11 on and off in each case with a certain delay relative to the refrigerating machine 6 , so as to first give the evaporator 7 the opportunity to cool down before air is circulated when the refrigerating machine 6 is started up, and so as to continue utilising residual cold of the evaporator 7 after the refrigerating machine 6 is switched off.
  • a first temperature sensor 12 is attached directly to a surface of the evaporator 7 , which is stroked by the air current circulating through the air duct when the ventilator 11 is running and on which as a result moisture precipitates from this air current and over time forms an ice layer 13 , shown as a lightly hatched surface.
  • a second temperature sensor 14 is arranged in the upper opening 4 , from which air cooled in the evaporator chamber 5 flows back to the inner chamber 2 .
  • the evaporator 7 is conventionally operated at intervals, that is, supplied by the refrigerating machine 6 with liquid coolant.
  • the monitoring circuit 10 detects the difference between the temperatures measured by the sensors 12 and 14 in each case with a preset time delay from when the evaporator is started up or at a point in time when the change in speed of the temperature detected by one of the temperature sensors 12 , 14 has fallen below a limit value and therefore can be assumed that the temperature distribution in the air duct is no longer all that far removed by stationary distribution.
  • the difference between the temperatures detected by the temperature sensors 12 , 14 at such a point in time is at the lowest when the thickness of the ice layer is zero, and it increases with the thickness of the ice layer.
  • the monitoring circuit 10 waits until the inner chamber 2 is sufficiently cooled down for the refrigerating machine 6 and the ventilator 11 to be switched off, and then closes a switch 9 , via which the defrosting heating unit 8 is supplied with current.
  • the period, during which the switch 9 remains closed, is preset and considering the performance of the defrosting heating unit 8 is selected such that the quantity of heat given off in this period must suffice to thaw the ice layer 13 .
  • FIG. 3 schematically illustrates an enlarged detail of a refrigeration device according to a second embodiment of the invention. It is distinguished from the embodiment of FIG. 1 only by the placing of the temperature sensors 12 ′, 14 ′, so that the refrigeration device does not have to be illustrated and described in its entirety.
  • the two temperature sensors 12 ′, 14 ′ are held here on a carrier 15 made of a poor heat-conducting material, which is attached, e.g. adhered to a surface of the evaporator 7 , on which an ice layer 13 can form.
  • FIG. 4 shows the temperature difference ⁇ T detected under the same conditions as in the embodiment of FIG. 1 between the sensors as a function of the thickness d of the ice layer.
  • the thickness of the ice layer is less than the distance d 1 of the temperature sensor 12 ′ from the surface of the evaporator 7 , both temperature sensors are subjected to the air current in the evaporator chamber 5 , and their temperature is determined substantially by that of the air current. Since the distancing of the second temperature sensor 14 ′ from the evaporator 7 is greater than that of the first sensor 12 ′, the second sensor is in any case slightly warmer than the first.
  • the temperature difference ⁇ T therefore now begins to grow fast with the layer thickness d.
  • the temperature difference, corresponding to the critical layer thickness dmax, can take on another value ⁇ Tmax′ than in the embodiment of FIG. 1 . Since a large increase in the curve of FIG. 4 can be realised in the vicinity of dmax, precise and reproducible detection of the critical layer thickness dmax is 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)
  • Defrosting Systems (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
US10/551,561 2003-04-04 2004-04-05 Refrigeration device and operating method for the same Abandoned US20060242973A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10315524A DE10315524A1 (de) 2003-04-04 2003-04-04 Kältegerät und Betriebsverfahren dafür
DE10315524.4 2003-04-04
PCT/EP2004/003609 WO2004088222A1 (de) 2003-04-04 2004-04-05 Kältegerät und betriebsverfahren dafür

Publications (1)

Publication Number Publication Date
US20060242973A1 true US20060242973A1 (en) 2006-11-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US10/551,561 Abandoned US20060242973A1 (en) 2003-04-04 2004-04-05 Refrigeration device and operating method for the same

Country Status (7)

Country Link
US (1) US20060242973A1 (zh)
EP (1) EP1613906A1 (zh)
CN (1) CN1833147A (zh)
BR (1) BRPI0409186A (zh)
DE (1) DE10315524A1 (zh)
RU (1) RU2349847C2 (zh)
WO (1) WO2004088222A1 (zh)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080148733A1 (en) * 2006-12-22 2008-06-26 Genedics Llc System and method for creating a closed-loop riparian geothermal infrastructure
GB2456744A (en) * 2007-08-30 2009-07-29 Ebac Ltd Auto-defrost refrigeration apparatus
US20100050682A1 (en) * 2008-08-28 2010-03-04 Ariga Tohru Integrated air conditioner
US20180292121A1 (en) * 2017-04-11 2018-10-11 Lg Electronics Inc. Refrigerator
IT201900005938A1 (it) * 2019-04-17 2020-10-17 Ali Group S R L Procedimento di controllo del ghiacciamento dell’evaporatore, in un abbattitore di temperatura
US11493260B1 (en) 2018-05-31 2022-11-08 Thermo Fisher Scientific (Asheville) Llc Freezers and operating methods using adaptive defrost

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007066360A1 (en) * 2005-12-06 2007-06-14 Giuseppe Floris Device for detecting the characteristics of ice-snow-hoar frost
CN107940873B (zh) * 2017-11-17 2020-12-04 合肥美的电冰箱有限公司 化霜方法、化霜系统、计算机可读存储介质和制冷设备
CN110873504B (zh) * 2018-08-31 2021-04-23 沈阳海尔电冰箱有限公司 冰箱的化霜控制方法和冰箱
CN111322812A (zh) * 2018-12-17 2020-06-23 青岛海尔生物医疗股份有限公司 风冷冰箱智能进入化霜的控制方法、控制装置及冰箱
CN109654775A (zh) * 2018-12-18 2019-04-19 青岛经济技术开发区海尔热水器有限公司 一种除霜控制方法及空气源热泵系统
CN109850419B (zh) * 2018-12-25 2024-03-29 广州好高冷科技有限公司 一种基于混冷的多循环变风量蓄冷保温箱通风装置
CN110873447B (zh) * 2019-11-29 2021-11-12 深圳麦克维尔空调有限公司 一种制冷空调的除霜控制方法、装置及设备
CN110887315A (zh) * 2019-12-03 2020-03-17 珠海格力电器股份有限公司 冰箱化霜检测装置、冰箱化霜控制方法及冰箱
DE102023200198A1 (de) 2023-01-12 2024-07-18 BSH Hausgeräte GmbH Bestimmen eines Abtauzeitpunkts eines Verdampfers eines Haushalts-Kältegeräts

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US3359749A (en) * 1965-06-17 1967-12-26 Thermo King Corp Differential control device
US3839878A (en) * 1971-12-23 1974-10-08 Philips Corp Apparatus for controlling refrigerator defrost apparatus
US4345441A (en) * 1980-01-12 1982-08-24 Danfoss A/S Defroster for the evaporator of a refrigerator
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US4852360A (en) * 1987-12-08 1989-08-01 Visual Information Institute, Inc. Heat pump control system
US4860551A (en) * 1987-12-29 1989-08-29 Whirlpool Corporation Frost sensor for an appliance
US5003786A (en) * 1989-04-07 1991-04-02 Mitsubishi Jukogyo Kabushiki Kaisha Refrigerating apparatus
US5440890A (en) * 1993-12-10 1995-08-15 Copeland Corporation Blocked fan detection system for heat pump
US5575158A (en) * 1994-10-05 1996-11-19 Russell A Division Of Ardco, Inc. Refrigeration defrost cycles
US6260365B1 (en) * 2000-01-07 2001-07-17 Traulsen & Company, Inc. Control system and related methods for refrigeration and freezer units
US6467282B1 (en) * 2000-09-27 2002-10-22 Patrick D. French Frost sensor for use in defrost controls for refrigeration
US20090266093A1 (en) * 2005-07-26 2009-10-29 Mitsubishi Electric Corporation Refrigerating air conditioning system

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JPH09178328A (ja) * 1995-12-28 1997-07-11 Ishizuka Denshi Kk 着霜検知装置
DE69622199D1 (de) * 1996-02-06 2002-08-08 Ishizuka Electronics Corp Vorrichtung zum feststellen von eisbildung
JPH10227555A (ja) * 1997-02-18 1998-08-25 Toshiba Corp 冷蔵庫制御装置
JPH1194437A (ja) * 1997-09-19 1999-04-09 Ishizuka Electronics Corp 着霜検知器
JP2000180022A (ja) * 1998-12-16 2000-06-30 Sanden Corp 冷却器の着霜検知装置
TR200200796T2 (tr) * 1999-09-24 2002-06-21 Arçeli̇k A.Ş. Buzdolabı içi defrost kontrol yöntemi
JP2001133124A (ja) * 1999-11-05 2001-05-18 Sanden Corp 冷却器の着霜検知装置
JP2001215077A (ja) * 2000-02-02 2001-08-10 Hitachi Ltd 除霜制御装置と制御方法、および冷蔵庫
JP2001263912A (ja) * 2000-03-17 2001-09-26 Hitachi Ltd 冷蔵庫
JP2002090035A (ja) * 2000-09-11 2002-03-27 Daiwa Industries Ltd 庫内の着霜検知機構
DE10053422A1 (de) * 2000-10-27 2002-05-08 Bsh Bosch Siemens Hausgeraete Kältegerät mit Abtau-Automatik

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3359749A (en) * 1965-06-17 1967-12-26 Thermo King Corp Differential control device
US3839878A (en) * 1971-12-23 1974-10-08 Philips Corp Apparatus for controlling refrigerator defrost apparatus
US4417452A (en) * 1980-01-04 1983-11-29 Honeywell Inc. Heat pump system defrost control
US4345441A (en) * 1980-01-12 1982-08-24 Danfoss A/S Defroster for the evaporator of a refrigerator
US4843833A (en) * 1984-03-06 1989-07-04 Trw Canada Limited Appliance control system
US4852360A (en) * 1987-12-08 1989-08-01 Visual Information Institute, Inc. Heat pump control system
US4860551A (en) * 1987-12-29 1989-08-29 Whirlpool Corporation Frost sensor for an appliance
US5003786A (en) * 1989-04-07 1991-04-02 Mitsubishi Jukogyo Kabushiki Kaisha Refrigerating apparatus
US5440890A (en) * 1993-12-10 1995-08-15 Copeland Corporation Blocked fan detection system for heat pump
US5575158A (en) * 1994-10-05 1996-11-19 Russell A Division Of Ardco, Inc. Refrigeration defrost cycles
US6260365B1 (en) * 2000-01-07 2001-07-17 Traulsen & Company, Inc. Control system and related methods for refrigeration and freezer units
US20010054292A1 (en) * 2000-01-07 2001-12-27 Ronald Davis Control system and related methods for refrigeration and freezer units
US6467282B1 (en) * 2000-09-27 2002-10-22 Patrick D. French Frost sensor for use in defrost controls for refrigeration
US20090266093A1 (en) * 2005-07-26 2009-10-29 Mitsubishi Electric Corporation Refrigerating air conditioning system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080148733A1 (en) * 2006-12-22 2008-06-26 Genedics Llc System and method for creating a closed-loop riparian geothermal infrastructure
GB2456744A (en) * 2007-08-30 2009-07-29 Ebac Ltd Auto-defrost refrigeration apparatus
US20100050682A1 (en) * 2008-08-28 2010-03-04 Ariga Tohru Integrated air conditioner
US8584481B2 (en) * 2008-08-28 2013-11-19 Sharp Kabushiki Kaisha Integrated air conditioner
US20180292121A1 (en) * 2017-04-11 2018-10-11 Lg Electronics Inc. Refrigerator
US10718562B2 (en) * 2017-04-11 2020-07-21 Lg Electronics Inc. Refrigerator
US11415359B2 (en) * 2017-04-11 2022-08-16 Lg Electronics Inc. Refrigerator
US11493260B1 (en) 2018-05-31 2022-11-08 Thermo Fisher Scientific (Asheville) Llc Freezers and operating methods using adaptive defrost
IT201900005938A1 (it) * 2019-04-17 2020-10-17 Ali Group S R L Procedimento di controllo del ghiacciamento dell’evaporatore, in un abbattitore di temperatura
EP3726167A1 (en) * 2019-04-17 2020-10-21 Ali Group S.r.l. Control process for controlling the icing of the evaporator in a blast chiller

Also Published As

Publication number Publication date
EP1613906A1 (de) 2006-01-11
CN1833147A (zh) 2006-09-13
WO2004088222A1 (de) 2004-10-14
RU2349847C2 (ru) 2009-03-20
RU2005130293A (ru) 2006-06-10
BRPI0409186A (pt) 2006-05-30
DE10315524A1 (de) 2004-10-14

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