US3786227A - Heat exchanger defrost apparatus - Google Patents

Heat exchanger defrost apparatus Download PDF

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Publication number
US3786227A
US3786227A US00306665A US3786227DA US3786227A US 3786227 A US3786227 A US 3786227A US 00306665 A US00306665 A US 00306665A US 3786227D A US3786227D A US 3786227DA US 3786227 A US3786227 A US 3786227A
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United States
Prior art keywords
plates
heat
tubes
heat exchanger
junction points
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.)
Expired - Lifetime
Application number
US00306665A
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English (en)
Inventor
R Seipp
Clure H Mc
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.)
Thermo King Corp
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Thermo King Corp
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Filing date
Publication date
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Publication of US3786227A publication Critical patent/US3786227A/en
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    • 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
    • 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

Definitions

  • a plate and tube heat exchanger assembly includes a plurality of coolant transporting tubes and a plurality of spaced plates to be periodically defrosted.
  • the tubes pass through the plates and are in heat conducting relationship therewith at junction points with the plates.
  • At least one but less than all of the plates may 1 be modified, according to the instant invention, to include an electric heating element disposed at one end thereof for imparting'heat through the plate and to the tubes and other plates at the junction points therebetween at predetermined times for periodic defrosting.
  • the thickness of the plates having heating elements associated therewith are of a greater thickness than the remainder of the plates.
  • This invention relates to a plate and tube heat exchanger assembly, such as that comprising a refrigerator evaporator, which includes a plurality of parallel coolant transporting tubes and a plurality of spaced plates which are to be periodically defrosted.
  • the plates extend transversely from the tubes, and the tubes are adapted to pass through and be in heat conducting. relationship with the plates at junction points with the plates.
  • At least one of the plates has a respective heating element disposed at one end.
  • the heating element is a tubular electrical heating device which is retained at the end of a respective plate by means of a clamp in order that heat generated by the device may be imparted to the plate and through the tubes to other plates at the junction points therebetween at a predetermined time when it is desired to accomplish the periodic defrosting.
  • a respective plate having a heating element attached thereto may be modified in accordance with the inven-' tion to include a transversely extending leg.
  • the leg extends below the tubes and is adapted to secure the plate to the assembly defrost and collection pan in order that heat may be supplied thereto in the assembled relationship to insure free draining.
  • FIG. 1 is a top plan view of the heat exchanger and evaporator section of a refrigeration system employing the defrost apparatus of the present invention
  • FIG. 2 is a frontal elevation of the heat exchanger section assembled in relation to the refrigeration system defrost and collection pan;
  • FIG. 3 is an isometric view of one of the heat ex.- change plates modified in accordance with the instant invention to include a tubular electric heating element.
  • Assembly 1 comprises a plurality of generally parallel coolant transporting tube segments 2 and a plurality of thermally conductive spaced plates or thin fin members 4 which extend transversely from the tubes. Tubes 2 may be serially connected together and disposed in the general configuration of a coil 35 with a coolant inlet end 7 and a coolant outlet end 8 by connecting U-shaped end members 6 to tubes 2 as illustrated, or in any other suitable fashion.
  • heat exchanger assembly 1 is an air cooling evaporator with the connected tube configuration representing the evaporator coil 35.
  • the evaporator assembly 1 also includes conventional transverse frame members 10 and a defrost and collection pan 12,
  • the evaporator coil 35 is adapted to make a series of passes through apertures 25 (best shown in FIG. 3) provided in the fin members.
  • the tube segments 2 are in heat conducting relationship with the junction points formed with the fins.
  • heat exchanger assemblies of the present type require periodic defrosting to prevent the buildup of frost on the fin members 4 which could impede the flow of air therethroughand consequently reduce the cooling effectiveness of the unit.
  • An improved defrost apparatus has been developed which may successfully transmit heat into the evaporator coil to prevent front accumulation among the fin members, as will be detailed more fully hereinafter.
  • individual fin members at regularly spaced intervals may be replaced by a modified thick plate 15 which is fabricated from a highly heat conductive material, such as Aluminum, for example.
  • the thickness of plates 15 may be equal to about ten times the regular thickness of fin members 4.
  • Each plate 15 includes a heating element for defrosting the evaporator and a means for retaining the heating element to the plate.
  • the heating element is disposed at one end of the plates 15, it is within the scope of this invention to retain a heating element from both ends of the plates simultaneously.
  • the heating element is a tubular electric heater 20 such as those known under the trade names of Calrod or Corox, but any other conventional tubular heater may be employed equally well.
  • the heater element is attached to the plate 15 by means of a clamp 22.
  • the clamp 22 may comprise complementary halves 23 and 24 fastened together by any suitable means, such as by bolt 27 with the tubular electric heater 20 interposed between the halves, as shown, or, the clamp may be a single, uniform member.
  • the defrost apparatus just described may provide a more even thermal distribution across the heat exchanger evaporator coil 35 and defrost more effec tively than conventional methods of imbedding tubular heaters within the edgeof the coil.
  • the thick highly heat conductive plates can provide a rigid heater retention means while acting as a primary conduction path for imparting heat through the plate to the tube segments 2 at the junction points therebetween.
  • the heat may then be evenly distributed through the evaporator coil and to the thin fin members 4 at predetermined times for periodic defrosting of the fins when any suitable switch means (not shown), connected in line between an electric power source (not shown) and a respective heater, is manually or automatically turned on to provide the heating element with a current supply.
  • Heat conducting plates 15 may be further modified as shown in FIG. 3, to include a foot member 30 extending transversely from the plate. As best shown in FIG. 2, foot 30 extends below the evaporator coil 35 to adapt plates 15 to rest upon and be secured to the evaporator defrost and collection pan 12 in the assembled relationship.
  • the tubular heaters may therefore provide a direct source of heat for the collection pan 12 to permit the pan to be freely drained.
  • a defrost apparatus has been disclosed which not only provides for a uniform heat distribution and effi cient defrosting of the evaporator heat exchange fins but is also a source of heat for the defrost and collecplacement. Other modifications will occur to those skilled in the art.
  • a plate tube heat exchanger assembly including a plurality of parallel coolant transporting tubes and a plurality of spaced plates to be periodically defrosted and extending transversely from said tubes, said tubes passing through said plates and being in heat conducting relationship therewith at junction points with said plates, 2. select number of said parallel plates comprising less than all of said plurality of spaced plates having respective heat imparting means connected thereto, the thickness of each of said select number of plates being greater than the relative thickness of the remainder of the plates not having said heat imparting means, whereby heat is transferred through said select number of plates of increased thickness and to said tubes at the junction points therebetween at predetermined times for periodic defrosting.
  • said plates having respective heat imparting means include a foot member extending transversely from said plates to adapt said plates to be secured to a heat exchanger defrost and collection pan.

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)
  • Defrosting Systems (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US00306665A 1972-11-15 1972-11-15 Heat exchanger defrost apparatus Expired - Lifetime US3786227A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US30666572A 1972-11-15 1972-11-15

Publications (1)

Publication Number Publication Date
US3786227A true US3786227A (en) 1974-01-15

Family

ID=23186296

Family Applications (1)

Application Number Title Priority Date Filing Date
US00306665A Expired - Lifetime US3786227A (en) 1972-11-15 1972-11-15 Heat exchanger defrost apparatus

Country Status (8)

Country Link
US (1) US3786227A (xx)
JP (1) JPS5125811Y2 (xx)
BE (1) BE807170A (xx)
CA (1) CA990519A (xx)
DE (1) DE2355356C2 (xx)
ES (1) ES197196Y (xx)
GB (1) GB1412316A (xx)
ZA (1) ZA738220B (xx)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918268A (en) * 1974-01-23 1975-11-11 Halstead Ind Inc Heat pump with frost-free outdoor coil
US4346285A (en) * 1979-04-28 1982-08-24 Murata Manufacturing Co., Ltd. Heating device employing thermistor with positive coefficient characteristic
US4369350A (en) * 1978-11-29 1983-01-18 Hitachi, Ltd. Electric defroster heater mounting arrangement for stacked finned refrigeration evaporator
US4766736A (en) * 1987-10-13 1988-08-30 Thermal King Corporation Evaporator coil heat exchanger assembly
US5826442A (en) * 1996-05-31 1998-10-27 Daewoo Electronics Co., Ltd. Defroster for refrigerators
WO2003081151A1 (en) * 2002-03-22 2003-10-02 Arçel K A. . Evaporator and evaporator production method
US20070000271A1 (en) * 2003-11-28 2007-01-04 Lg Electronics Inc. Defroster for evaporator in refrigerator
WO2008120892A2 (en) * 2007-03-30 2008-10-09 Lg Electronics Inc. Evaporator with defrosting heater
US20130327743A1 (en) * 2009-08-07 2013-12-12 Radyne Corporation Heat Treatment of Helical Springs or Similarly Shaped Articles by Electric Resistance Heating
US20160136712A1 (en) * 2013-06-05 2016-05-19 Neturen Co., Ltd. Heating method, heating apparatus, and hot press molding method for plate workpiece
CN108800728A (zh) * 2018-08-23 2018-11-13 赵玉环 制冷设备用的板状发热体
CN109186137A (zh) * 2018-11-08 2019-01-11 合肥美的电冰箱有限公司 蒸发器组件及冰箱
US10935329B2 (en) 2015-01-19 2021-03-02 Hussmann Corporation Heat exchanger with heater insert
US20220146183A1 (en) * 2020-11-06 2022-05-12 Whirlpool Corporation Refrigeration unit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9906252D0 (en) * 1999-03-18 1999-05-12 Imi Cornelius Uk Ltd Beverage cooling
JP6491544B2 (ja) * 2015-06-08 2019-03-27 昭和電工株式会社 エバポレータ

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1073813A (en) * 1912-05-24 1913-09-23 Alvin B Neiman Heat-radiator.
US2492397A (en) * 1946-01-26 1949-12-27 Bush Mfg Company Defroster for evaporators
US2529215A (en) * 1947-11-10 1950-11-07 Trane Co Heat exchanger
DE1127062B (de) * 1958-03-01 1962-04-05 Schaltbau Gmbh Verbundheizkoerper
US3099914A (en) * 1961-12-29 1963-08-06 Gen Electric Refrigerating apparatus
US3138006A (en) * 1962-04-30 1964-06-23 Gen Motors Corp Refrigerating apparatus including defrost means
US3358467A (en) * 1965-07-16 1967-12-19 Clark Equipment Co Refrigerated case drain blockage warning structure

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2930207A (en) * 1957-12-02 1960-03-29 Whirlpool Co Heater clamping assemblies

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1073813A (en) * 1912-05-24 1913-09-23 Alvin B Neiman Heat-radiator.
US2492397A (en) * 1946-01-26 1949-12-27 Bush Mfg Company Defroster for evaporators
US2529215A (en) * 1947-11-10 1950-11-07 Trane Co Heat exchanger
DE1127062B (de) * 1958-03-01 1962-04-05 Schaltbau Gmbh Verbundheizkoerper
US3099914A (en) * 1961-12-29 1963-08-06 Gen Electric Refrigerating apparatus
US3138006A (en) * 1962-04-30 1964-06-23 Gen Motors Corp Refrigerating apparatus including defrost means
US3358467A (en) * 1965-07-16 1967-12-19 Clark Equipment Co Refrigerated case drain blockage warning structure

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918268A (en) * 1974-01-23 1975-11-11 Halstead Ind Inc Heat pump with frost-free outdoor coil
USRE29966E (en) * 1974-01-23 1979-04-17 Halstead Industries, Inc. Heat pump with frost-free outdoor coil
US4369350A (en) * 1978-11-29 1983-01-18 Hitachi, Ltd. Electric defroster heater mounting arrangement for stacked finned refrigeration evaporator
US4346285A (en) * 1979-04-28 1982-08-24 Murata Manufacturing Co., Ltd. Heating device employing thermistor with positive coefficient characteristic
US4766736A (en) * 1987-10-13 1988-08-30 Thermal King Corporation Evaporator coil heat exchanger assembly
US5826442A (en) * 1996-05-31 1998-10-27 Daewoo Electronics Co., Ltd. Defroster for refrigerators
WO2003081151A1 (en) * 2002-03-22 2003-10-02 Arçel K A. . Evaporator and evaporator production method
US8087261B2 (en) * 2003-11-28 2012-01-03 Lg Electronics Inc. Defroster for evaporator in refrigerator
US20070000271A1 (en) * 2003-11-28 2007-01-04 Lg Electronics Inc. Defroster for evaporator in refrigerator
WO2008120892A2 (en) * 2007-03-30 2008-10-09 Lg Electronics Inc. Evaporator with defrosting heater
WO2008120892A3 (en) * 2007-03-30 2008-11-20 Lg Electronics Inc Evaporator with defrosting heater
US20180070409A1 (en) * 2009-08-07 2018-03-08 Radyne Corporation Heat Treatment of Helical Springs or Similarly Shaped Articles by Electric Resistance Heating
US9814100B2 (en) * 2009-08-07 2017-11-07 Radyne Corporation Heat treatment of helical springs or similarly shaped articles by electric resistance heating
US20130327743A1 (en) * 2009-08-07 2013-12-12 Radyne Corporation Heat Treatment of Helical Springs or Similarly Shaped Articles by Electric Resistance Heating
US11044788B2 (en) * 2009-08-07 2021-06-22 Radyne Corporation Heat treatment of helical springs or similarly shaped articles by electric resistance heating
US20160136712A1 (en) * 2013-06-05 2016-05-19 Neturen Co., Ltd. Heating method, heating apparatus, and hot press molding method for plate workpiece
US10935329B2 (en) 2015-01-19 2021-03-02 Hussmann Corporation Heat exchanger with heater insert
CN108800728A (zh) * 2018-08-23 2018-11-13 赵玉环 制冷设备用的板状发热体
WO2020037855A1 (zh) * 2018-08-23 2020-02-27 赵玉环 制冷设备用的板状发热体
CN109186137A (zh) * 2018-11-08 2019-01-11 合肥美的电冰箱有限公司 蒸发器组件及冰箱
CN109186137B (zh) * 2018-11-08 2020-08-04 合肥美的电冰箱有限公司 蒸发器组件及冰箱
US20220146183A1 (en) * 2020-11-06 2022-05-12 Whirlpool Corporation Refrigeration unit
US11686523B2 (en) * 2020-11-06 2023-06-27 Whirlpool Corporation Refrigeration unit

Also Published As

Publication number Publication date
ES197196Y (es) 1975-09-01
DE2355356A1 (de) 1974-05-22
JPS5125811Y2 (xx) 1976-07-01
JPS5016557U (xx) 1975-02-21
ES197196U (es) 1975-04-01
AU6193373A (en) 1975-05-01
ZA738220B (en) 1974-09-25
DE2355356C2 (de) 1983-03-31
BE807170A (fr) 1974-05-09
CA990519A (en) 1976-06-08
GB1412316A (en) 1975-11-05

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