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KR20090024171A - 복합 형상의 펄스 전열식 제빙 - Google Patents

복합 형상의 펄스 전열식 제빙 Download PDF

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Publication number
KR20090024171A
KR20090024171A KR1020087030997A KR20087030997A KR20090024171A KR 20090024171 A KR20090024171 A KR 20090024171A KR 1020087030997 A KR1020087030997 A KR 1020087030997A KR 20087030997 A KR20087030997 A KR 20087030997A KR 20090024171 A KR20090024171 A KR 20090024171A
Authority
KR
South Korea
Prior art keywords
thickness
shape
ice making
ice
power supply
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Withdrawn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
KR1020087030997A
Other languages
English (en)
Korean (ko)
Inventor
빅터 페트렌코
Original Assignee
더 트러스티즈 오브 다트마우스 칼리지
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 더 트러스티즈 오브 다트마우스 칼리지 filed Critical 더 트러스티즈 오브 다트마우스 칼리지
Publication of KR20090024171A publication Critical patent/KR20090024171A/ko
Withdrawn legal-status Critical Current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
    • F25C—PRODUCING, WORKING OR HANDLING ICE
    • F25C5/00—Working or handling ice
    • F25C5/02—Apparatus for disintegrating, removing or harvesting ice
    • F25C5/04—Apparatus for disintegrating, removing or harvesting ice without the use of saws
    • F25C5/08—Apparatus for disintegrating, removing or harvesting ice without the use of saws by heating bodies in contact with the ice
    • 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
    • F25D21/08—Removing frost by electric heating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/84—Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Production, Working, Storing, Or Distribution Of Ice (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)
KR1020087030997A 2006-05-22 2007-05-22 복합 형상의 펄스 전열식 제빙 Withdrawn KR20090024171A (ko)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US80240706P 2006-05-22 2006-05-22
US60/802,407 2006-05-22

Publications (1)

Publication Number Publication Date
KR20090024171A true KR20090024171A (ko) 2009-03-06

Family

ID=39402323

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020087030997A Withdrawn KR20090024171A (ko) 2006-05-22 2007-05-22 복합 형상의 펄스 전열식 제빙

Country Status (6)

Country Link
US (1) US20100059503A1 (fr)
EP (1) EP2032916A2 (fr)
KR (1) KR20090024171A (fr)
CN (1) CN101484763A (fr)
CA (1) CA2653021A1 (fr)
WO (1) WO2008060696A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014164733A1 (fr) * 2013-03-13 2014-10-09 William David Duncan Systèmes et procédés de dégivrage

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0823121D0 (en) 2008-12-18 2009-01-28 Penny & Giles Controls Ltd Ice detection system
US9016073B2 (en) * 2013-03-14 2015-04-28 Whirlpool Corporation Ice maker with heatless ice removal and method for heatless removal of ice
EP3691408A1 (fr) 2015-01-12 2020-08-05 LaminaHeat Holding Ltd. Élément de chauffage de tissus
US10017262B2 (en) * 2015-09-22 2018-07-10 Rohr, Inc. Pulsed deicing system
CA3001643A1 (fr) 2015-10-19 2017-04-27 Laminaheat Holding Ltd. Elements de chauffage stratifies ayant une resistance personnalisee ou non uniforme et/ou des formes irregulieres et procedes de fabrication
USD911038S1 (en) 2019-10-11 2021-02-23 Laminaheat Holding Ltd. Heating element sheet having perforations
CN112629093B (zh) * 2021-03-09 2021-07-02 中国空气动力研究与发展中心低速空气动力研究所 一种薄膜热刀、模型表面的生长冰型的去除方法
CN113028693A (zh) * 2021-04-14 2021-06-25 中国空气动力研究与发展中心设备设计与测试技术研究所 一种冰晶生成装置及生成方法

Family Cites Families (111)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1056987A (en) * 1912-07-15 1913-03-25 Achilles Calloway Gough Electric curling-iron.
US1656329A (en) * 1924-12-06 1928-01-17 Sievert Ernst Gustav High-tension cable adapted for small currents
US2205543A (en) * 1936-11-06 1940-06-25 Rideau Jean Robert Heating surface
US2496279A (en) * 1945-02-10 1950-02-07 Safeway Heat Elements Inc Flexible electric heater for deicing airfoils
US2870311A (en) * 1955-12-19 1959-01-20 Kaiser Aluminium Chem Corp Electrical conductor and system
US2988899A (en) * 1957-04-02 1961-06-20 Heron Andrew George Refrigerant evaporator with defrosting means
US3014251A (en) * 1959-07-06 1961-12-26 Patricia E Stern Thermal energy recovery and transfer device for deicing and other purposes
US3204084A (en) * 1963-05-07 1965-08-31 Gen Dynamics Corp Electrical deicer
US3256920A (en) * 1964-08-14 1966-06-21 Byers J Harold Method for increasing the traction of vehicle tires with icy road surfaces
US3316345A (en) * 1965-04-26 1967-04-25 Central Electr Generat Board Prevention of icing of electrical conductors
US3316344A (en) * 1965-04-26 1967-04-25 Central Electr Generat Board Prevention of icing of electrical conductors
US3380261A (en) * 1966-04-04 1968-04-30 Grover E. Hendrix Method and apparatus for making ice
DE2153434B2 (de) * 1971-10-27 1972-11-09 Licentia Patent Verwaltungs GmbH, 6000 Frankfurt Befestigung von erosionsschutzkanten an flugzeugprofilen
US3809341A (en) * 1972-11-14 1974-05-07 I Levin Device for removing ice from surfaces of thin-walled structures
US3964183A (en) * 1973-01-08 1976-06-22 B. C. Research Method and apparatus for detaching coatings frozen on to surfaces
US3790752A (en) * 1973-03-26 1974-02-05 Ford Motor Co Heatable laminated windshield construction
US4330703A (en) * 1975-08-04 1982-05-18 Raychem Corporation Layered self-regulating heating article
US3971056A (en) * 1975-02-18 1976-07-20 Cutler-Hammer, Inc. Semiconductor temperature switches
DE2510660A1 (de) * 1975-03-12 1976-09-23 Rautenbach Robert Waermetauscher mit phasenumwandlung fluessig/fest oder dampffoermig/fest eines stoffes
DE2537850A1 (de) * 1975-08-26 1977-03-10 Rautenbach Robert Verfahren zur trocknung von schuettguetern in einem gefriertrockner
US4085338A (en) * 1976-02-20 1978-04-18 Georgy Andreevich Genrikh High-voltage network for areas with high rate of icing
US4135221A (en) * 1976-12-16 1979-01-16 Lvovsky Politekhnichesky Institut Ice melting circuit arrangement for a high-voltage transmission network
US4082962A (en) * 1977-07-11 1978-04-04 Burgsdorf Vladimir Vladimirovi Device for melting the icing by direct current on conductors of overhead power transmission line
US4222000A (en) * 1977-07-15 1980-09-09 Lucas Industries Limited Battery heating system
US4137447A (en) * 1978-04-28 1979-01-30 Ford Motor Company Electric heater plate
US4190137A (en) * 1978-06-22 1980-02-26 Dainichi-Nippon Cables, Ltd. Apparatus for deicing of trolley wires
FR2430847A1 (fr) * 1978-07-13 1980-02-08 Saint Gobain Vitrage chauffant et/ou d'alarme
US4278875A (en) * 1979-12-19 1981-07-14 The Boeing Company Electrically heated window
US4585178A (en) * 1981-05-19 1986-04-29 Arzt Allan H Coal car thawing system
US4442681A (en) * 1981-09-28 1984-04-17 Fischer Harry C Ice-maker
US4460818A (en) * 1981-10-30 1984-07-17 Anetsberger Brothers, Inc. Drain safety interlock for fryers
CA1195163A (fr) * 1981-11-18 1985-10-15 Howard W. Long Methode et dispositif de deglacage des chaussees
US4752673A (en) * 1982-12-01 1988-06-21 Metcal, Inc. Autoregulating heater
EP0121959B1 (fr) * 1983-03-03 1987-11-25 Fokker Aircraft B.V. Système pour casser un élément de connection pour tension
US4985313A (en) * 1985-01-14 1991-01-15 Raychem Limited Wire and cable
US4531380A (en) * 1984-01-10 1985-07-30 Turbo Refrigerating Company Ice making machine
US4563572A (en) * 1984-08-01 1986-01-07 Armstrong World Industries, Inc. High-efficiency task heater
DE3437304A1 (de) * 1984-10-11 1986-04-17 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zur bestimmung der temperatur, vorzugsweise der eisgrenzschichttemperatur, eines elektrischen widerstandsheizelementes einer enteisungsanlage fuer flugzeuge, hubschrauber oder dergleichen
FR2578377B1 (fr) * 1984-12-26 1988-07-01 Aerospatiale Element chauffant de dispositif de degivrage d'une structure alaire, dispositif et son procede d'obtention
US4732351A (en) * 1985-03-21 1988-03-22 Larry Bird Anti-icing and deicing device
US4743740A (en) * 1985-10-07 1988-05-10 Rohr Industries, Inc. Buried element deicer
US4673797A (en) * 1985-10-28 1987-06-16 Donnelly Corporation Power control for heated windshields
US4798058A (en) * 1986-02-28 1989-01-17 Charles Gregory Hot gas defrost system for refrigeration systems and apparatus therefor
US5068589A (en) * 1986-04-16 1991-11-26 Texas Instruments Incorporated Supplemental automotive vehicular heater system and method of providing same
US4760978A (en) * 1986-11-19 1988-08-02 Cox & Company, Inc. Ice-free screen for protecting engines from damage caused by foreign bodies in the intake airstream
JP2720449B2 (ja) * 1987-05-25 1998-03-04 株式会社デンソー 車両用充電装置
US4814546A (en) * 1987-11-25 1989-03-21 Minnesota Mining And Manufacturing Company Electromagnetic radiation suppression cover
US4820902A (en) * 1987-12-28 1989-04-11 Ppg Industries, Inc. Bus bar arrangement for an electrically heated transparency
US6193793B1 (en) * 1988-01-28 2001-02-27 Howard W. Long Asphaltic compositions and uses therefor
US4897597A (en) * 1988-12-08 1990-01-30 Surface Systems, Inc. Apparatus and methods for detecting wet and icy conditions
US5398547A (en) * 1989-01-10 1995-03-21 Innovative Dynamics, Inc. Apparatus for measuring ice distribution profiles
US5218472A (en) * 1989-03-22 1993-06-08 Alcan International Limited Optical interference structures incorporating porous films
BR9001349A (pt) * 1989-03-22 1991-04-02 Alcan Int Ltd Estrutura de interferencia otica,estrutura capaz de ser convertida em uma estrutura de interferencia otica,processo para producao de uma estrutura de interferencia otica,dispositivo de interferencia otica,indicador de cozimento paraum recipiente de alimento util em microondas e montagem de um recipiente de alimento util em microondas
US4950950A (en) * 1989-05-18 1990-08-21 Eastman Kodak Company Electroluminescent device with silazane-containing luminescent zone
US5061836A (en) * 1990-01-18 1991-10-29 United Technologies Corporation Microwave deicing for aircraft engine propulsor blades
US5109140A (en) * 1990-04-16 1992-04-28 Nguyen Kha D High fidelity audio cable
DE4237167C2 (de) * 1991-11-14 2003-04-17 Perkin Elmer Corp Vorrichtung zum geregelten Beheizen einer Ionenquelle eines thermionischen Detektors
US5466913A (en) * 1991-11-15 1995-11-14 Funai Electric Co., Ltd. Bread making apparatus and its temperature control method
JP2632470B2 (ja) * 1992-02-28 1997-07-23 東日本旅客鉄道株式会社 面状発熱体による踏切の融雪構造
US5380983A (en) * 1993-07-12 1995-01-10 Black & Decker Inc. Electrical appliance having user proximity sensor
US5441305A (en) * 1993-07-16 1995-08-15 Tabar; William J. Apparatus and method for powered thermal friction adjustment
US5582754A (en) * 1993-12-08 1996-12-10 Heaters Engineering, Inc. Heated tray
US5411121A (en) * 1994-03-22 1995-05-02 Laforte; Jean-Louis Deicing device for cable
US5523959A (en) * 1994-04-25 1996-06-04 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Ice detector and deicing fluid effectiveness monitoring system
US5496989A (en) * 1994-05-05 1996-03-05 United Technology Corporation Windshield temperature control system
US5408844A (en) * 1994-06-17 1995-04-25 General Electric Company Ice maker subassembly for a refrigerator freezer
US5744704A (en) * 1995-06-07 1998-04-28 The Regents, University Of California Apparatus for imaging liquid and dielectric materials with scanning polarization force microscopy
US5573685A (en) * 1996-02-05 1996-11-12 Boncaldo; Paul J. Remote control antifreeze device for a vehicle locking unit
FR2744872B1 (fr) * 1996-02-08 1998-04-10 Eurocopter France Dispositif de chauffage d'un profil aerodynamique
US6239601B1 (en) * 1996-03-20 2001-05-29 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Thickness measurement device for ice, or ice mixed with water or other liquid
US5873254A (en) * 1996-09-06 1999-02-23 Interface Multigrad Technology Device and methods for multigradient directional cooling and warming of biological samples
FR2756253B1 (fr) * 1996-11-27 1999-01-29 Eurocopter France Elements resistifs pour le chauffage d'un profil aerodynamique, et dispositif de chauffage d'un profil aerodynamique incorporant de tels elements
US5886321A (en) * 1996-12-19 1999-03-23 Ppg Industries, Inc. Arrangement for heating the wiper rest area of a vehicle windshield
US5861855A (en) * 1997-02-03 1999-01-19 Hughes Electronics Corporation Method and apparatus for de-icing a satellite dish antenna
US6097904A (en) * 1997-02-13 2000-08-01 Canon Kabushiki Kaisha Control apparatus for energizing heating element
US5902962A (en) * 1997-04-15 1999-05-11 Gazdzinski; Robert F. Cable and method of monitoring cable aging
US6027075A (en) * 1997-06-16 2000-02-22 Trustees Of Dartmouth College Systems and methods for modifying ice adhesion strength
US6279856B1 (en) * 1997-09-22 2001-08-28 Northcoast Technologies Aircraft de-icing system
US5934617A (en) * 1997-09-22 1999-08-10 Northcoast Technologies De-ice and anti-ice system and method for aircraft surfaces
US6237874B1 (en) * 1997-09-22 2001-05-29 Northcoast Technologies Zoned aircraft de-icing system and method
US6558947B1 (en) * 1997-09-26 2003-05-06 Applied Chemical & Engineering Systems, Inc. Thermal cycler
JPH11278007A (ja) * 1998-03-30 1999-10-12 Yataro Ichikawa スリップ防止装置及び之を有する車両
US7087876B2 (en) * 1998-06-15 2006-08-08 The Trustees Of Dartmouth College High-frequency melting of interfacial ice
US6693786B2 (en) * 1998-06-15 2004-02-17 The Trustees Of Dartmouth College Modification of ice friction in transportation systems
US7038125B2 (en) * 1998-06-15 2006-05-02 Petrenko Victor F Low-frequency de-icing of cableways
US6847024B2 (en) * 1998-06-15 2005-01-25 Trustees Of Dartmouth College Prevention of ice formation by applying electric power to a liquid water layer
US6576115B2 (en) * 1998-06-15 2003-06-10 The Trustees Of Dartmouth College Reduction of ice adhesion to land surfaces by electrolysis
JP2003517555A (ja) * 1998-10-27 2003-05-27 トラスティーズ・オブ・ダートマウス・カレッジ 氷付着強度を変えるためのシステムおよび方法
AU3206300A (en) * 1998-12-01 2000-06-19 Trustees Of Dartmouth College Methods and structures for removing ice from surfaces
CA2253762A1 (fr) * 1998-12-04 2000-06-04 Hydro-Quebec Appareil et methode de commutation pour des lignes de transport d'energie electrique
US6018152A (en) * 1999-04-13 2000-01-25 Allaire; Marc-Andre Method and device for de-icing conductors of a bundle of conductors
US6246831B1 (en) * 1999-06-16 2001-06-12 David Seitz Fluid heating control system
US6227492B1 (en) * 1999-08-06 2001-05-08 Bell Helicopter Textron Inc. Redundant ice management system for aircraft
US6489594B2 (en) * 1999-10-29 2002-12-03 Msx, Inc. Heating apparatus for preventing ice dams on a roof
JP2001343126A (ja) * 2000-05-31 2001-12-14 Sanyo Electric Co Ltd 加熱調理器
US6681580B2 (en) * 2001-09-12 2004-01-27 Manitowoc Foodservice Companies, Inc. Ice machine with assisted harvest
US7265323B2 (en) * 2001-10-26 2007-09-04 Engineered Glass Products, Llc Electrically conductive heated glass panel assembly, control system, and method for producing panels
DE60214329T2 (de) * 2002-01-14 2006-12-28 Head Technology Gmbh Verbesserter Ski, Verfahren zum Versteifen des Skis und Verfahren zum Herstellen des Skis
US20080223842A1 (en) * 2002-02-11 2008-09-18 The Trustees Of Dartmouth College Systems And Methods For Windshield Deicing
US7638735B2 (en) * 2002-02-11 2009-12-29 The Trustees Of Dartmouth College Pulse electrothermal and heat-storage ice detachment apparatus and methods
ATE405133T1 (de) * 2002-02-11 2008-08-15 Dartmouth College Systeme und verfahren zum ändern einer eis-objekt grenzfläche
US6753513B2 (en) * 2002-03-19 2004-06-22 Hamilton Sundstrand Propeller de-icing system
PL211467B1 (pl) * 2002-07-05 2012-05-31 Seco Warwick Społka Z Ograniczoną Odpowiedzialnością Układ regulacji temperatury w procesie termicznej obróbki metali
US6915959B2 (en) * 2003-06-26 2005-07-12 Msx, Inc. Apparatus and method for monitoring of an automatic deicing controller
US20060011596A1 (en) * 2003-10-28 2006-01-19 Sharp Larry L Screen printed heater for vehicle elements
TWI335407B (en) * 2003-12-19 2011-01-01 Hoshizaki Electric Co Ltd Automatic ice making machine
EP2221561A2 (fr) * 2004-06-22 2010-08-25 The Trustees of Dartmouth College Systèmes de pulsation et procédés pour détacher de la glace
US7928345B2 (en) * 2004-10-22 2011-04-19 Ppg Industries Ohio, Inc. Aircraft windshield defogging/deicing system and method of use thereof
US7355302B2 (en) * 2005-11-23 2008-04-08 Ice Corporation System and method for providing power and control through a rotating interface
US7423243B2 (en) * 2006-03-03 2008-09-09 Allied Precision Industries, Inc. Heating system and method
US9656757B2 (en) * 2008-09-16 2017-05-23 Hamilton Sundstrand Corporation Propeller deicing system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014164733A1 (fr) * 2013-03-13 2014-10-09 William David Duncan Systèmes et procédés de dégivrage
US9512580B2 (en) 2013-03-13 2016-12-06 Elwha Llc Systems and methods for deicing
US9714494B2 (en) 2013-03-13 2017-07-25 Elwha Llc Systems and methods for deicing

Also Published As

Publication number Publication date
CA2653021A1 (fr) 2008-05-22
WO2008060696A2 (fr) 2008-05-22
CN101484763A (zh) 2009-07-15
US20100059503A1 (en) 2010-03-11
EP2032916A2 (fr) 2009-03-11
WO2008060696A3 (fr) 2008-09-12

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Legal Events

Date Code Title Description
PA0105 International application

Patent event date: 20081219

Patent event code: PA01051R01D

Comment text: International Patent Application

PG1501 Laying open of application
PC1203 Withdrawal of no request for examination
WITN Application deemed withdrawn, e.g. because no request for examination was filed or no examination fee was paid