EP2261416A1 - Échangeur thermique pour séchoir, spécialement pour un séchoir domestique - Google Patents

Échangeur thermique pour séchoir, spécialement pour un séchoir domestique Download PDF

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Publication number
EP2261416A1
EP2261416A1 EP09007604A EP09007604A EP2261416A1 EP 2261416 A1 EP2261416 A1 EP 2261416A1 EP 09007604 A EP09007604 A EP 09007604A EP 09007604 A EP09007604 A EP 09007604A EP 2261416 A1 EP2261416 A1 EP 2261416A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
fin
fins
exchanger according
flow direction
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.)
Granted
Application number
EP09007604A
Other languages
German (de)
English (en)
Other versions
EP2261416B1 (fr
Inventor
Sergio Pillot
Flavio Noviello
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.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
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 Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to EP09007604A priority Critical patent/EP2261416B1/fr
Priority to US12/796,900 priority patent/US20100307020A1/en
Publication of EP2261416A1 publication Critical patent/EP2261416A1/fr
Application granted granted Critical
Publication of EP2261416B1 publication Critical patent/EP2261416B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/206—Heat pump arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/0408—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids
    • F28D1/0426—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids with units having particular arrangement relative to the large body of fluid, e.g. with interleaved units or with adjacent heat exchange units in common air flow or with units extending at an angle to each other or with units arranged around a central element
    • F28D1/0435—Combination of units extending one behind the other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0477—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/22—Lint collecting arrangements

Definitions

  • the invention relates to a heat exchanger for a dryer, especially for a domestic dryer, which has a plurality of fins, wherein a flow channel is established between two fins, wherein air is guided along a flow direction through the flow channel from an inlet edge to an outlet edge.
  • Heat exchangers of this type are usually employed in domestic laundry dryers, especially in heat pump tumble dryers to which this invention relates specifically.
  • the heat exchanger consists of a plurality of flat panels which are arranged with a certain distance to another, i. e. between the panel surfaces of two adjacent fins a distance is kept. By this, a plurality of flow channels is created. Humid air from the laundry is blown through the flow channels. As the air is in contact with the surface of the fins a heat transmission can take place which is necessary for carrying out the drying of the laundry.
  • a certain problem is that the heat exchanger is exposed to a contamination with lint which is contained in the air.
  • the heat exchangers i. e. the evaporator and the condenser, especially of the heat pump tumble dryer, are not removable and an additional filter needs to be periodically cleaned due to the fact that not all lint is filtered by the main filtering system of the dryer.
  • the filtering system is improved there are still certain amounts of lint which reach the heat exchangers.
  • lint accumulations take place at the entrance of the evaporator and the condenser, which causes performance degradation. Consequently, it is necessary to clean the heat exchanger from time to time to ensure its function.
  • a heat exchanger for a dryer especially for a domestic dryer, which is designed in such a way that the lint accumulation in the heat exchanger is significantly reduced. Consequently, it should become possible to go without a separate filter system which is arranged near the heat exchanger for cleaning the heat exchanger from lint.
  • the solution of this object according to the invention is characterized in that at least the inlet edge of the fin has at least partially a rounded shape seen in a direction perpendicular to the flow direction and parallel to the surface of the fin.
  • the fins have a flat shape.
  • the rounded shape can have a semi-circle shape according to a first preferred embodiment of the invention.
  • the rounded shape can connect the surfaces of the fin and a flat portion of the fin, wherein the flow direction is perpendicular on the flat portion.
  • the rounded shape can have a quadrant shape.
  • the quadrant shape has a radius of 10 % till 30 % of the width of the fin at the inlet edge.
  • a further preferred embodiment of the invention suggests that the rounded shape has a drop-shaped form.
  • the maximum width of the fin at the inlet edge measured in a direction perpendicular to the flow direction is greater than the width of the fin at a location in flow direction behind the inlet edge.
  • outlet edge of the fin can have at least partially a rounded shape seen in a direction perpendicular to the flow direction and parallel to the surface of the fin.
  • the surface of the fin is preferably arranged under an acute angle to the flow direction. This angle can be between 0.25° and 2°.
  • the distance between the surfaces of two fins can decreases in flow direction.
  • More than one plurality of fins can be arranged in succession in flow direction, wherein each set of fins have the proposed rounded shape at the inlet edge.
  • the heat exchanger can be an evaporator or a condenser of a domestic dryer.
  • the invention found out that the accumulation of the lint is mainly due to sharp edged on the entrance of the heat exchangers as being used by common fins of heat exchangers of domestic laundry dryers.
  • the invention aims to avoid the accumulation of lint on the heat exchangers with a new shape of the fins. Instead of the common known design with sharp edges on the entrance of the evaporator and the condenser, there is suggested to provide a radius specifically at the inlet edge of the fins.
  • the fins of the heat exchanger are bent fins, wherein the bending is the inlet edge of the fin comprising the at least partially rounded shape.
  • these fins are bent like a "V", they are V-shaped, with an at least partially rounded tip of the "V”.
  • These fins comprise a draft angle between adjacent fins in order to have different dimensions between the entrance (inlet) and the exit (outlet) of the flow channel between two fins of the heat exchangers. More space between fins in the entrance is aimed in order to facilitate the crossing of the lint and lower pitch on the exit is aimed to improve the heat exchange.
  • the number of contact collars is doubled so there is a further improvement of heat exchange between refrigerant and fins.
  • the new shape of the heat exchanger fins allows to avoid lint accumulation on the entrance of the heat exchangers.
  • FIG 1 a bottom part of a domestic laundry dryer is shown which has two heat exchangers 1, i. e. an evaporator (in the front) and a condenser (in the back). Air is flowing through the heat exchangers 1 in a flow direction F. As the air contains lint, in usual heat exchangers an accumulation of lint appears for example at a location marked with C in FIG 1 . It is the aim of the invention to avoid this lint sedimentation.
  • Each heat exchanger 1 consists of a plurality of fins 2 which can be seen in the further figures.
  • the fins 2 form a plurality of flow channels 3, i. e. a flow channel 3 is established between two adjacent fins 2.
  • Each fin 2 has an inlet edge 4 and an outlet edge 5.
  • the heat exchanger 1 here consists of two sections, each having the plurality of fins 2.
  • the inlet edge 4 of the fin 2 has at least partially a rounded shape, when regarded in a direction perpendicular to the flow direction F and parallel to the surface 7 of the fin 2.
  • FIG 4, FIG 5 and FIG 6 where details of this design are shown.
  • the rounded shape is established by paint or lacquer which is applied to the inlet edge 4 of the fins 2.
  • the paint forms a drop-shape contour at the inlet edge 4 of the fin 2 which ensures that lint does find no hold at the edge and consequently does not accumulate at the inlet edge 4.
  • the design according to FIG 5 comes up with fins 2 which are bent in the shown form (V-shape with rounded tip).
  • the fins 2 are made from a thin metal sheet wherein the surfaces 7 are arranged under an acute angle ⁇ which is between 0.25° and 2.0° to the flow direction F. Consequently, the distance a between two adjacent fins 2 decreases in flow direction F.
  • this arrangement of the fins produces turbulences between two facing surfaces 7 which improve the heat transfer.
  • the rounded shape 6 of the fin 2 at the inlet edge 4 is semi-circular. This design can be used with or without the specific form of the surfaces 7 running under the angle ⁇ .
  • the rounded shape 6' consists of two quadrants which connect a flat portion 8 of the fin 2.
  • a preferred embodiment suggests a relation between the width b' of the fin at the inlet edge 4 to the radius r of the quadrant; the radius r can be between 10 % and 30 % of the width b'.
  • FIG 6c shows schematically a drop-shaped form of the rounded shape 6".
  • the maximum width B of the fin 2 is here greater than the width b of the fin according to the base form at the inlet edge 4.
  • the fins 2 shown in FIG 6a, 6b and 6c can be compact sheets with surfaces 7, which means that the room between the surfaces 7 of one fin is filled with material.
  • the fins 2 can be bent sheets, which means that the fin 2 is hollow, the hollow room between the surfaces 7 is just surrounded by the bent sheet.
  • the edge designs shown in FIG 6a, 6b and 6c are shown with surfaces 7 running under the angle ⁇ . But all these edge designs can also be realized with surfaces 7 running parallel to the Flow direction.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Geometry (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP09007604A 2009-06-09 2009-06-09 Échangeur de chaleur pour séchoir, spécialement pour un séchoir domestique Not-in-force EP2261416B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP09007604A EP2261416B1 (fr) 2009-06-09 2009-06-09 Échangeur de chaleur pour séchoir, spécialement pour un séchoir domestique
US12/796,900 US20100307020A1 (en) 2009-06-09 2010-06-09 Heat Exchanger for a Dryer, Especially for a Domestic Dryer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09007604A EP2261416B1 (fr) 2009-06-09 2009-06-09 Échangeur de chaleur pour séchoir, spécialement pour un séchoir domestique

Publications (2)

Publication Number Publication Date
EP2261416A1 true EP2261416A1 (fr) 2010-12-15
EP2261416B1 EP2261416B1 (fr) 2013-02-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP09007604A Not-in-force EP2261416B1 (fr) 2009-06-09 2009-06-09 Échangeur de chaleur pour séchoir, spécialement pour un séchoir domestique

Country Status (2)

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US (1) US20100307020A1 (fr)
EP (1) EP2261416B1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2594688A1 (fr) * 2011-11-21 2013-05-22 Electrolux Home Products Corporation N.V. Sèche-linge avec système de pompe à chaleur
EP2644768A1 (fr) 2012-03-30 2013-10-02 BSH Electrodomésticos España, S.A. Pompe à chaleur pour appareil de traitement de linge
WO2013144780A1 (fr) 2012-03-30 2013-10-03 BSH Bosch und Siemens Hausgeräte GmbH Pompe à chaleur pour un appareil de traitement de vêtements et appareil de traitement de vêtements comprenant une telle pompe à chaleur
US20140144035A1 (en) * 2010-11-29 2014-05-29 Electrolux Home Products Corporation N.V. Laundry dryer
EP2871432A1 (fr) 2013-11-06 2015-05-13 BSH Hausgeräte GmbH Pompe à chaleur pour un appareil ménager
WO2015068092A1 (fr) 2013-11-06 2015-05-14 BSH Hausgeräte GmbH Pompe à chaleur destinée à un appareil ménager
IT201900011568A1 (it) * 2019-07-12 2021-01-12 Air Hex Alonte S R L Aletta a resistenza migliorata e relativa batteria di scambio termico.

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130255095A1 (en) * 2012-03-27 2013-10-03 Bsh Bosch Und Siemens Hausgerate Gmbh Clothes treatment appliance with condenser and cleaning device
US20130255097A1 (en) * 2012-03-27 2013-10-03 Bsh Bosch Und Siemens Hausgerate Gmbh Clothes treatment appliance with condenser and cleaning device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6082786A (ja) * 1983-10-13 1985-05-10 Matsushita Electric Ind Co Ltd フイン付熱交換器
WO2008146488A1 (fr) * 2007-05-31 2008-12-04 Panasonic Corporation Sèche-linge

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4621438A (en) * 1980-12-04 1986-11-11 Donald M. Thompson Energy efficient clothes dryer
US6913069B2 (en) * 2003-08-14 2005-07-05 Hewlett-Packard Development Company, L.P. Cooling device having fins arranged to funnel air
US7472742B2 (en) * 2005-12-01 2009-01-06 General Electric Company Heat sink assembly
US20080066888A1 (en) * 2006-09-08 2008-03-20 Danaher Motion Stockholm Ab Heat sink

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6082786A (ja) * 1983-10-13 1985-05-10 Matsushita Electric Ind Co Ltd フイン付熱交換器
WO2008146488A1 (fr) * 2007-05-31 2008-12-04 Panasonic Corporation Sèche-linge

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140144035A1 (en) * 2010-11-29 2014-05-29 Electrolux Home Products Corporation N.V. Laundry dryer
US9273903B2 (en) * 2010-11-29 2016-03-01 Electrolux Home Products Corporation N.V. Laundry dryer
EP2594688A1 (fr) * 2011-11-21 2013-05-22 Electrolux Home Products Corporation N.V. Sèche-linge avec système de pompe à chaleur
WO2013075997A1 (fr) * 2011-11-21 2013-05-30 Electrolux Home Products Corporation N.V. Sèche-linge équipé d'un système de pompe à chaleur
CN103946441A (zh) * 2011-11-21 2014-07-23 伊莱克斯家用产品股份有限公司 具有热泵系统的衣物干燥机
CN103946441B (zh) * 2011-11-21 2016-12-14 伊莱克斯家用产品股份有限公司 具有热泵系统的衣物干燥机
EP2644768A1 (fr) 2012-03-30 2013-10-02 BSH Electrodomésticos España, S.A. Pompe à chaleur pour appareil de traitement de linge
WO2013144780A1 (fr) 2012-03-30 2013-10-03 BSH Bosch und Siemens Hausgeräte GmbH Pompe à chaleur pour un appareil de traitement de vêtements et appareil de traitement de vêtements comprenant une telle pompe à chaleur
EP2871432A1 (fr) 2013-11-06 2015-05-13 BSH Hausgeräte GmbH Pompe à chaleur pour un appareil ménager
WO2015068092A1 (fr) 2013-11-06 2015-05-14 BSH Hausgeräte GmbH Pompe à chaleur destinée à un appareil ménager
IT201900011568A1 (it) * 2019-07-12 2021-01-12 Air Hex Alonte S R L Aletta a resistenza migliorata e relativa batteria di scambio termico.

Also Published As

Publication number Publication date
EP2261416B1 (fr) 2013-02-20
US20100307020A1 (en) 2010-12-09

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