US3267692A - Staggered finned evaporator structure - Google Patents

Staggered finned evaporator structure Download PDF

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Publication number
US3267692A
US3267692A US459756A US45975665A US3267692A US 3267692 A US3267692 A US 3267692A US 459756 A US459756 A US 459756A US 45975665 A US45975665 A US 45975665A US 3267692 A US3267692 A US 3267692A
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United States
Prior art keywords
fins
evaporator
leading edges
fin
upstream
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Expired - Lifetime
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US459756A
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English (en)
Inventor
Aelred J Pfeiffer
Philip F Harbour
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Westinghouse Electric Corp
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Westinghouse Electric Corp
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Publication date
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Priority to US459756A priority Critical patent/US3267692A/en
Priority to JP4989466U priority patent/JPS4838614Y1/ja
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Publication of US3267692A publication Critical patent/US3267692A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators

Definitions

  • FIGS. v u w J 1 FIG.6 are identical to FIGS. v u w J 1 FIG.6.
  • frostless food freezers in which air at a belowafreezing temperature is circulated through the frozen food compartment.
  • Such freezers substantially avoid the build-up of frost upon the food packages by removing most of the moisture from the air in the form of frost on an evaporator operating at a temperature substantially below freezing.
  • the frost on the evaporator must be periodically removed by defrosting the evaporator to reduce the resistance to air fiow presented by the frost build-up, and to restore the initial heat transfer characteristics of the evaporator.
  • lengthening of the time between defrosting cycles is desirable since reduction in frequency of defrosting in turn promotes overall uniformity of temperature in the freezer compartrnent, and reduces the fluctuations in load against which the refrigeration system works.
  • the general object of the invention is the provision of a refrigeration arrangement in which the frequency of defrosting is reduced.
  • a more specific object is the provision of such an arrangement in which the evaporator is designed to accumulate a substantially greater frost buildaup without unduly restricting air flow therethrough.
  • a fin and tube evaporator be provided with the leading edges of adjacent fins having a staggered arrangement, and with the more forwardly projecting fins being provided with cut-out areas in their surfaces generally facing the leading edges of the adjacent recessed fins. Accordingly the frost, which tends to first accumulate on the leading edges of the fins, is permitted to build up in a transverse direction to a substantially greater degree without unduly narrowing the air flow passages between the adjacent fins at the point of frost buildup.
  • clogging of the air flow passages between fins is further reduced by effectively lengthening the leading edges of individual fins by notching or, alternatively, otherwise providing inclined contours in the leading edges.
  • FIGURE 1 is a schematic representation of one refrigeration arrangement incorporating the invention
  • FIGURE 2 is a top view of a fin and tube type evaporator having the staggered fin array presented by the air entering face of the evaporator;
  • FIGURE 3 is a sectional view of the evaporator of FIGURE 1 illustrating the manner in which frost accumulates on the leading edges of the fins;
  • FIGURE 4 is a fragmentary side view of a medium length fin having a cut-out in its surface area generally facing the leading edge of a shorter length fin;
  • IGURE 5 is a fragmentary side view similar to FIG. 4 but illustrating the arrangement of the cut-out in a long fin;
  • FIGURE 6 is a fragmentary side view of a medium length fin having a leading edge shaped to effectively lengthen it in accordance with one modification of the invention.
  • FIGURE 7 is a fragmentary side view of another fin having a shaped leading edge to effectively lengthen it in accordance with another modification of the invention.
  • the refrigeration arrangement of FIGURE 1 includes a refrigerant compressor 10 connected to supply refrigerant through condenser 12 to a fin and tube type evaporator 14 which receives refrigerant in a state sufficient to depress the temperature of the evaporator to a level well below freezing.
  • the air to be cooled is [forced through the evaporator, passing between the parallel fins, by means of a fan 16.
  • Suitable duct-work carries the cold air to the freezer compartment 18 and back to the fan in the recirculating path generally indicated by the brokenline arrows of FIGURE 1.
  • the evaporator 14 (FIG. 2) is of the extended surface type comprising a serpentine tube arrangement and a plurality of spaced-apart, generally parallel fins.
  • the fins are suitably slotted to accommodate the serpentine tubes 20 which wind back and forth transverse to the planes of the fins, and to carry the refrigerant into heat transfer relation with the evaporator fins.
  • one tube circuit carries refrigerant for cooling purposes only, while a separate tube may be provided to carry a defrosting fluid (usually hot refrigerant gas) at selected times to defrost of the evaporator.
  • the evaporator includes fins of three different lengths as measured in the direction of airflow indicated by the arrows.
  • One set of fins 22 have their leading edges projecting farthest upstream into the air fiow and are termed the long fins.
  • Another set of fins 24 have their leading edges recessed, i.e., offset in a downstream direction from the leading edges of the long fins, and these fins are identified as medium length fins 24.
  • the third set of fins 26 are the shortest fins in the direction of air flow and have leading edges recessed still farther in a downstream direction.
  • both the medium length fin 24, and the long fins 22 are provided with cut-out portions 30 and 32, respectively, which transversely face the leading edge 26a (indicated by the broken line of the adjacent short fin 26).
  • the purpose of the cut-outs 30 and 32 is to provide an area where no frost build-up can occur on the medium and longer length fins. Thus, a passage for air flow remains for a considerably longer period after the frost build-up on the leading edge of the short fins extends substantially into the space between the adjacent fins.
  • FIGURES 6 and 7 illustrate forms that the leading edges of the various fins may take in effectively lengthening these leading edges.
  • both the medium length fin 24 and the short fin are provided with saw-toothed shaped notches 36 and 38, respectively, to effect the lengthening of the leading edges.
  • the medium fin 24 is provided on its leading edge with a single notch 40, and the leading edge of the short fin 26, again indicated by the broken line, simply extends at an angle for most of its length.
  • the cut-out portions 42 are located to face a substantial part of the length of the leading edge of the short fin and are formed as two separate cut-outs with a bridge between for purposes of rigidity of the fin.
  • cut-out areas may in some instances take the form of the space left when a tab is bent out transversely.
  • the number of sets of fins may differ appreciably. Accordingly, it will be understood that the examples shown and described herein are only currently preferred modes of carrying out the invention and are not intended to limit the scope of the invention, as defined by the appended claims, to the specific detail illustrated.
  • an evaporator having spaced-apart, generally parallel fins between which air flows to be cooled;
  • a refrigeration producing system connected to said evaporator to supply refrigerant thereto in a condition producing a below-freezing temperature
  • said evaporator having at least two sets of fins altermating with each other, at least a portion of the fin leading edges of one set of fins projecting farther upstream into said air flow than the corresponding leading edge portion of the other set of fins, so that multiple spacings, in a transverse direction between facing fins, are presented by the upstream face of the evaporator as a whole;
  • said one set of fins including surface areas downstream from said leading edge portions provided with cutout areas generally facing, in a transverse direction, the leading edge portions of said other set of fins having leading edge portions recessed in a down stream direction to delay clogging of said evaporator due to frost build-up on said leading edge portions of said other set of fins.
  • At least a portion of the length of the leading edges of one set of fins extends at an angle with respect to the direction of said air flow to effectively lengthen said leading edges.
  • a fin arrangement for a fin and tube type refrigerant evaporator adapted to normally operate at a belowfreezing temperature including:
  • said upstream projecting fins including cutout portions in that area of their surfaces facing, in a transverse direction, the leading edges of the recessed fins to delay bridging of frost between said leading edges of said recessed fins and said fins having said facing cut-out portions.
  • a fin-type refrigerant evaporator adapted to normally operate at below-freezing temperatures to chill air passing between the fins, including:
  • the surface areas of said selected fins including openings therein facing, in a transverse direction, said leading edges of said other fins to delay clogging of said evaporator due to frost build-up on said leading edges of said other fins.
  • At least a portion of the leading edges of said selected fins and said other fins are inclined with respect to the direction of said air fiow to effectively lengthen said leading edges.
  • At least a portion of the leading edges of said selected fins and said other fins include V-shaped notches therein.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US459756A 1965-05-28 1965-05-28 Staggered finned evaporator structure Expired - Lifetime US3267692A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US459756A US3267692A (en) 1965-05-28 1965-05-28 Staggered finned evaporator structure
JP4989466U JPS4838614Y1 (enrdf_load_stackoverflow) 1965-05-28 1966-05-28

Applications Claiming Priority (1)

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US459756A US3267692A (en) 1965-05-28 1965-05-28 Staggered finned evaporator structure

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JP (1) JPS4838614Y1 (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3381494A (en) * 1966-10-27 1968-05-07 Clark Equipment Co Frost collector evaporator coil
US4353223A (en) * 1979-07-17 1982-10-12 Bosch-Siemens Hausgerate Gmbh Refrigerator with a large refrigeration chamber cooled by natural convection
US5157941A (en) * 1991-03-14 1992-10-27 Whirlpool Corporation Evaporator for home refrigerator
US6094934A (en) * 1998-10-07 2000-08-01 Carrier Corporation Freezer
US6354367B1 (en) 2001-02-12 2002-03-12 Rheem Manufacturing Company Air conditioning unit having coil portion with non-uniform fin arrangement
WO2004016996A1 (en) * 2002-08-14 2004-02-26 Multibrás S.A. Eletrodomésticos Evaporator for a refrigeration system
US20040123613A1 (en) * 2001-05-04 2004-07-01 Chiang Robert Hong Leung Medium temperature refrigerated merchandiser
US20040168456A1 (en) * 2001-05-04 2004-09-02 Chiang Robert Hong Leung Evaporator for medium temperature refrigerated merchandiser
US20060113066A1 (en) * 2004-12-01 2006-06-01 Intel Corporation Heat exchanger configuration for pumped liquid cooling computer systems
EP1496323A3 (de) * 2003-07-05 2007-05-09 Heinen Freezing GmbH Kühlregister
WO2008039074A1 (en) * 2006-09-27 2008-04-03 Spot Cooler Systems As Cooling element
US20080115920A1 (en) * 2006-11-21 2008-05-22 Sanyo Electric Co., Ltd. Showcase
US20090323276A1 (en) * 2008-06-25 2009-12-31 Mongia Rajiv K High performance spreader for lid cooling applications
US8069678B1 (en) * 2006-06-07 2011-12-06 Bernert Robert E Heat transfer in the liquefied gas regasification process
CN102692099A (zh) * 2011-03-21 2012-09-26 珠海格力电器股份有限公司 换热器
US20160376986A1 (en) * 2015-06-25 2016-12-29 Hrst, Inc. Dual Purpose Heat Transfer Surface Device
US10352624B1 (en) * 2015-02-19 2019-07-16 J R Thermal LLC Intermittent thermosyphon

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2613065A (en) * 1947-11-21 1952-10-07 Chausson Usines Sa Cooling radiator
US2853859A (en) * 1945-05-04 1958-09-30 William I Thompson Cold traps
US3084914A (en) * 1958-06-23 1963-04-09 Scient Design Co Condenser for recovery of sublimable materials
US3099914A (en) * 1961-12-29 1963-08-06 Gen Electric Refrigerating apparatus
US3199581A (en) * 1961-01-11 1965-08-10 Peerless Of America Fin-type heat exchange unit with nonregistering fin edges for frost-inhibiting purposes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2853859A (en) * 1945-05-04 1958-09-30 William I Thompson Cold traps
US2613065A (en) * 1947-11-21 1952-10-07 Chausson Usines Sa Cooling radiator
US3084914A (en) * 1958-06-23 1963-04-09 Scient Design Co Condenser for recovery of sublimable materials
US3199581A (en) * 1961-01-11 1965-08-10 Peerless Of America Fin-type heat exchange unit with nonregistering fin edges for frost-inhibiting purposes
US3099914A (en) * 1961-12-29 1963-08-06 Gen Electric Refrigerating apparatus

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3381494A (en) * 1966-10-27 1968-05-07 Clark Equipment Co Frost collector evaporator coil
US4353223A (en) * 1979-07-17 1982-10-12 Bosch-Siemens Hausgerate Gmbh Refrigerator with a large refrigeration chamber cooled by natural convection
US5157941A (en) * 1991-03-14 1992-10-27 Whirlpool Corporation Evaporator for home refrigerator
US6094934A (en) * 1998-10-07 2000-08-01 Carrier Corporation Freezer
US6354367B1 (en) 2001-02-12 2002-03-12 Rheem Manufacturing Company Air conditioning unit having coil portion with non-uniform fin arrangement
AU747477B1 (en) * 2001-02-12 2002-05-16 Rheem Manufacturing Company Air conditioning unit having coil portion with non-uniform fin arrangement
US8151587B2 (en) 2001-05-04 2012-04-10 Hill Phoenix, Inc. Medium temperature refrigerated merchandiser
US20040123613A1 (en) * 2001-05-04 2004-07-01 Chiang Robert Hong Leung Medium temperature refrigerated merchandiser
US20040168456A1 (en) * 2001-05-04 2004-09-02 Chiang Robert Hong Leung Evaporator for medium temperature refrigerated merchandiser
US6923013B2 (en) 2001-05-04 2005-08-02 Carrier Corporation Evaporator for medium temperature refrigerated merchandiser
US7073347B2 (en) * 2002-08-14 2006-07-11 Multibras S.A. Eletrodomesticos Evaporator for a refrigeration system
US20050247077A1 (en) * 2002-08-14 2005-11-10 Multibras S.A. Eletrodomesticos Evaporator for a refrigeration system
WO2004016996A1 (en) * 2002-08-14 2004-02-26 Multibrás S.A. Eletrodomésticos Evaporator for a refrigeration system
EP1496323A3 (de) * 2003-07-05 2007-05-09 Heinen Freezing GmbH Kühlregister
AU2004308347B2 (en) * 2003-12-22 2009-04-23 Carrier Corporation Evaporator for medium temperature refrigerated merchandiser
US20060113066A1 (en) * 2004-12-01 2006-06-01 Intel Corporation Heat exchanger configuration for pumped liquid cooling computer systems
US8069678B1 (en) * 2006-06-07 2011-12-06 Bernert Robert E Heat transfer in the liquefied gas regasification process
EP2069697A4 (en) * 2006-09-27 2013-09-25 Envent As COOLING ELEMENT
JP2010505085A (ja) * 2006-09-27 2010-02-18 スポット・クーラー・システムズ・アーエス 冷却部材
US20090277621A1 (en) * 2006-09-27 2009-11-12 Spot Cooler Systems As Cooling element
WO2008039074A1 (en) * 2006-09-27 2008-04-03 Spot Cooler Systems As Cooling element
US20080115920A1 (en) * 2006-11-21 2008-05-22 Sanyo Electric Co., Ltd. Showcase
US8671705B2 (en) * 2006-11-21 2014-03-18 Sanyo Electric Co., Ltd. Showcase
US20090323276A1 (en) * 2008-06-25 2009-12-31 Mongia Rajiv K High performance spreader for lid cooling applications
CN102692099A (zh) * 2011-03-21 2012-09-26 珠海格力电器股份有限公司 换热器
US10352624B1 (en) * 2015-02-19 2019-07-16 J R Thermal LLC Intermittent thermosyphon
US20160376986A1 (en) * 2015-06-25 2016-12-29 Hrst, Inc. Dual Purpose Heat Transfer Surface Device

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Publication number Publication date
JPS4838614Y1 (enrdf_load_stackoverflow) 1973-11-14

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