EP2578741A1 - Thermoelektrische Wärmepumpe, Wärmetauscher, Haushaltsgerät und Verfahren zum Betreiben eines Haushaltsgeräts - Google Patents

Thermoelektrische Wärmepumpe, Wärmetauscher, Haushaltsgerät und Verfahren zum Betreiben eines Haushaltsgeräts Download PDF

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Publication number
EP2578741A1
EP2578741A1 EP20110183858 EP11183858A EP2578741A1 EP 2578741 A1 EP2578741 A1 EP 2578741A1 EP 20110183858 EP20110183858 EP 20110183858 EP 11183858 A EP11183858 A EP 11183858A EP 2578741 A1 EP2578741 A1 EP 2578741A1
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EP
European Patent Office
Prior art keywords
heat
heat exchanger
process air
dishwasher
heat pump
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
EP20110183858
Other languages
English (en)
French (fr)
Other versions
EP2578741B1 (de
Inventor
Ian David Dr. Hopkin
Jonathan Jayne
David Thomas
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.)
DBK David and Baader GmbH
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DBK David and Baader 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 DBK David and Baader GmbH filed Critical DBK David and Baader GmbH
Priority to EP11183858.7A priority Critical patent/EP2578741B1/de
Priority to PL11183858T priority patent/PL2578741T3/pl
Priority to DK11183858.7T priority patent/DK2578741T3/en
Publication of EP2578741A1 publication Critical patent/EP2578741A1/de
Application granted granted Critical
Publication of EP2578741B1 publication Critical patent/EP2578741B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0002—Washing processes, i.e. machine working principles characterised by phases or operational steps
    • A47L15/0013—Drying phases, including dripping-off phases
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0047—Energy or water consumption, e.g. by saving energy or water
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/48—Drying arrangements
    • A47L15/483—Drying arrangements by using condensers
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/48—Drying arrangements
    • A47L15/486—Blower arrangements
    • 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
    • F25B21/00—Machines, plants or systems, using electric or magnetic effects
    • F25B21/02—Machines, plants or systems, using electric or magnetic effects using Peltier effect; using Nernst-Ettinghausen effect
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/18—Air temperature
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/19—Air humidity
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/11—Air heaters
    • 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
    • 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
    • F25B2321/00—Details of machines, plants or systems, using electric or magnetic effects
    • F25B2321/02—Details of machines, plants or systems, using electric or magnetic effects using Peltier effects; using Nernst-Ettinghausen effects
    • F25B2321/025—Removal of heat
    • F25B2321/0252—Removal of heat by liquids or two-phase fluids

Definitions

  • the invention relates to a thermoelectric heat pump, a heat exchanger, a household appliance, especially a dishwasher, and a method for operating such household appliance.
  • a dishwasher In DE 10 2008 043 554 A1 a dishwasher is disclosed. It has an interior in which the dishes to be washed have to be arranged. Through a rinsing device disposed in the interior the dishes are supplied with water for cleaning. For draining the water from the interior a sump pit is provided in the bottom area of the dishwasher. Moreover, a heater is provided to heat the water prior to introducing it to the interior. For the purpose of saving energy the water can be heated to low temperature only, e.g. 30°C. For drying the dishes after the rinsing operation an energy-efficient sorption drying system is provided. It includes a tank in which reversibly dehydrogenizable drying material, for instance zeolite, is arranged.
  • the tank comprises an inlet connection for an inlet passage connected to the interior of the dishwasher for feeding process air from the interior to the tank and an outlet connection for an outlet passage equally connected to the interior for discharging the process air from the tank.
  • Process air is conveyed via a fan disposed in the inlet passage from the interior through the inlet passage to the tank and from there through the outlet passage into the interior again.
  • the process air passes through the drying material, whereby the humid process air coming from the interior of the dishwasher is dried.
  • the drying by the drying agent is carried out in an exothermal manner, thereby thermal energy being released by the drying agent when the humidity of the process air is absorbed.
  • the released thermal energy in turn results in heating the process air guided to the interior through the inlet passage, thus increasing the capability of the process air of absorbing humidity.
  • a particular liquid quantity is stored in the drying material.
  • the drying material is then dried at the start of the rinsing process.
  • the process air is conveyed again through the fan from the interior of the dishwasher through the inlet passage to the tank.
  • a heater is provided in the tank upstream of the drying material, wherein heated process air then dries the drying material by the absorption of humidity.
  • the process air flows through the inlet passage into the interior where it condenses at the dishes and gives off heat, thereby thermal energy being recovered for the rinsing operation.
  • the object underlying the invention is to provide a thermoelectric heat pump for a dishwasher and a heat exchanger for a dishwasher which allow for an energy-saving dishwasher having an inexpensive design that is simple in terms of devices. It is another object of the invention to provide an energy-saving household appliance, especially a dishwasher, having an inexpensive design that is simple in terms of devices. Furthermore, it is the object of the invention to provide a method for such household appliance which permits an energy-saving operation.
  • process air of a dishwasher can be cooled by a thermoelectric heat pump for the dishwasher, wherein waste heat being formed by the cooling operation is advantageously discharged by a heat pipe.
  • a thermoelectric heat pump for the dishwasher, wherein waste heat being formed by the cooling operation is advantageously discharged by a heat pipe.
  • Peltier elements are provided, for instance.
  • the cooling of the process air is especially carried out during a drying operation of dishes arranged in the dishwasher.
  • a liquid absorbed by the same is condensed.
  • By arranging a heat pipe the waste heat for instance, can be flexibly returned to the process air after cooling for energy recovery.
  • An inexpensive dishwasher having a simple design in terms of devices with low energy consumption can be manufactured with such heat pump.
  • One or more fins are mounted to the heat pipe so that the latter is capable of giving off the waste heat discharged by the same to a medium surrounding the heat pipe in a more efficient fashion.
  • the heat pump including the heat pipe and the fin can be easily incorporated in a dishwasher as a unit. At least one fin is brazed or pressed, for instance, with the heat pipe.
  • a heat exchanger for a dishwasher comprises a cooling section having a heat pump according to the invention for cooling process air flowing through the heat exchanger.
  • Such heat exchanger has an extremely inexpensive and simple design in terms of devices, which when used in a dishwasher results in an equally inexpensive dishwasher simple in terms of devices.
  • a dishwasher including such heat exchanger can be used in an energy-efficient manner when the heat pipe, for instance, recovers the waste heat discharged by the same to the dishwasher in the drying operation.
  • the heat exchanger can have a heating section downstream of the cooling section which can be heated via the heat pipe.
  • a heat exchanger of this type constitutes an extremely compact unit which can be easily built into the dishwasher.
  • the cooling section and/or the heating section of the heat exchanger can have at least one layer including a plurality of flow passages through which the process air is guided.
  • the cooling section and the heating section are preferably thermally substantially separated from each other.
  • a water drain for discharging condensed liquid from the cooling section can then be provided between the cooling section and the heating section.
  • a layer is preferably formed by two walls arranged at a parallel distance from each other between which the flow passages are formed.
  • Advantageously plural layers can be superimposed in this case.
  • At least part of the neighboring flow passages of the layer are advantageously in fluid communication with each other, whereby process air can flow from one flow passage to the other flow passage so as to avoid the heat pump, for instance, that constitutes a flow resistance.
  • At least one Peltier element of the heat pump is arranged between the flow passages of the cooling section, wherein a hot side of the Peltier element is thermally insulated against the process air at least in sections so as to prevent waste heat of the Peltier element from being recirculated to the process air in the area of the cooling section.
  • the heat pipe For the discharge of waste heat in the area of the heating section of the heat exchanger the heat pipe opens into this area, especially between the flow passages, thereby the process air being capable of circulating around the latter.
  • the communication of the flow passages is provided preferably in the area of the Peltier element and/or in the orifice area of the heat pipe, as the Peltier element as well as the heat pipe constitutes a flow resistance and the process air can spread over the flow passages in these areas.
  • the flow passages between the walls are formed, for instance, by fins that are V-shaped and/or disposed at a parallel distance and extend approximately perpendicularly to the walls.
  • a household appliance which is especially a dishwasher comprises a useful area to and from which process air can be supplied and discharged via a flow path in the form of a fluid passage.
  • a heat exchanger according to the invention is disposed which results in a dishwasher having an inexpensive and extremely simple design in terms of devices that can be employed in an energy-efficient manner.
  • a temperature and/or an air humidity sensor are provided in the fluid passage upstream and/or downstream of the heat exchanger.
  • a temperature and a relative air humidity of the process air can be detected before the latter enters the heat exchanger and by the detected values the dew point and the dew point temperature of the process air can be determined by way of psychrometric theory, for example by an electronic control unit (ECU), and thus the cooling section can be operated with a predetermined cooling capacity sufficient to result in the condensing of the humidity in the process air. In this way an unnecessarily high cooling capacity at low temperatures is avoided, which is energy-saving. It is imaginable to provide this also in a tumble-drier, for instance, including such thermoelectric heat pumps.
  • a method according to the invention for the household appliance according to the invention comprises the step of:
  • the method can additionally comprise the steps of:
  • FIG. 1 illustrates a dishwasher 1 in a schematic longitudinal sectional view according to an embodiment. It comprises a machine housing 2 including an interior 4 for receiving dishes. The interior 4 is accessible via a tilting door 6 pivoted to the machine housing 2 for loading and unloading the dishwasher 1 with the dishes. In the interior 4 two dish cages 8 and 10 can be arranged for receiving the dishes which are movable out of the interior 4 approximately horizontally when the tilting door 6 is opened.
  • a first rinsing arm 12 is provided approximately in the center of the interior 4 below the dish cage 10 and a second rinsing arm 14 is provided in the bottom area of the interior 4 below the dish cage 8. These arms are connected to a water source and mounted in the interior 4 in a conventional fashion.
  • a heat exchanger 16 including a heat pump 18 is provided which is arranged outside the interior in a bottom area 19 of the dishwasher 1. It serves for cooling process air so that the liquid absorbed by the process air is condensed. Further, the process air is re-heated via the heat exchanger 16 after cooling.
  • the process air is tapped through an outlet connection 20 by the interior 4 and is guided via an inlet passage 22 extending outside the interior 4 to the heat exchanger 16.
  • a fan 24 is provided in the inlet passage 22 for conveying the process air.
  • the heat exchanger 16 centrally further includes a water drain 30 or sump pit for discharging condensed water which is connected to a waste water connection, for instance, via an outlet passage 32.
  • the heat exchanger 16 is explained in detail in the following Figure 2 .
  • FIG 2 shows in a perspective view the heat exchanger 16 of the dishwasher 1 of Figure 1 in accordance with a first embodiment. It includes a cooling section 34 on the left in Figure 2 for cooling the process air and a heating section 36 on the right for heating the process air.
  • the sections 34 and 36 are thermally insulated from each other by a thermal insulator 38 disposed between the sections 34 and 36.
  • the insulator 38 in addition includes the water drain 30, see also Figure 1 .
  • the heat exchanger has two layers 40 and 42 each of which includes a plurality of flow passages 44 and 46 for guiding the process air 48 - represented in Figure 2 by a plurality of arrows.
  • the flow passages 44 and 46 of a respective layer 40 and 42 are restricted at their upper and lower areas by a wall.
  • the wall is formed by plates, wherein both the cooling section 34 includes three plates 50, 52 and 54 and the heating section 36 includes three plates 56, 58 and 60.
  • the plates 50, 52, 54 and 56, 58, 60 are arranged at a parallel distance from one another and extend in the flow direction of the process air 48.
  • Each of the flow passages 44 and 46 is constituted by a plurality of fins 61 and 63, resp., extending perpendicularly to the plates 50 to 60.
  • a heat pump 62 and 64 having two respective Peltier elements is associated with a respective layer 40 and 42 of the cooling section 34.
  • Such Peltier elements are sufficiently known from the state of the art and are disclosed, for instance, in the document WO 2007/138064 A1 for a dishwasher; therefore hereinafter more detailed explanations are dispensed with.
  • the heat pumps 62 and 64 are described below in more detail.
  • the Peltier elements penetrate a respective layer 40 and 42, resp., over the entire width thereof transversely to the direction of flow of the process air 48 and are arranged approximately in the center of a respective layer 40 and 42, resp., in the cooling section 34.
  • Waste heat of the Peltier elements is discharged through heat pipes 66 and 68 and is supplied to the heating section 36 of the heat exchanger 16 with the heat pipes 66 and 68 passing through the latter.
  • the heat pipe 66 is associated with the upper heat pump 62 in Figure 2 and the heat pipe 68 is associated with the lower heat pump 64. In Figure 2 only the portion of the heat pipes 66 and 68 projecting from the heat exchanger, which is U-shaped, is visible.
  • a first leg 70 of the heat pipes 66 and 68 penetrates the cooling section 34 between the Peltier elements.
  • Another leg 72 of the heat pipes 66 and 68 penetrates a respective layer 40 and 42 of the heating section 36 substantially transversely to the direction of flow of the process air 48 and centrally of a respective layer 40 and 42.
  • the heat pipes 66 and 68 per se are known equally sufficiently from the state of the art, which is therefore referred to for further explanations.
  • the process air 48 to be cooled is guided from the interior 4 of the dishwasher 1 of Figure 1 to the heat exchanger 16 and flows through the flow passages 44 and 46 of the layers 40 and 42 of the cooling section 34.
  • the process air 48 circulates around the Peltier elements of the heat pumps 62 and 64, respectively, whereby the process air is cooled and condenses humidity entrained by the same.
  • the condensed water then flows to the water drain 30, the layers 40 and 42 being appropriately configured.
  • the waste heat generated by the Peltier elements then arrives via the heat pipes 66 and 68 to the heating section 36 of the heat exchanger 16.
  • the cooled process air 48 then continues to flow after the cooling section 34 through the heating section 36 with the heat pipes 66 and 68, whereby the waste heat is discharged to the process air 48 and the latter is heated.
  • the fins 61 and 63 of the layers 40 and 42 additionally serve as absorbing surfaces of heat of the process air 48 and in the heating section 36 additionally serve as heat transfer surfaces of the waste heat from the heat pipes 66 and 68 to the process air 48.
  • Behind the heat exchanger 16 the dried and heated process air is recirculated to the interior 4 of the dishwasher 1 of Figure 1 .
  • the heat pipes are thermally insulated outside the heating section 36 so that the waste heat is discharged to the ambience substantially only in the heating section 36.
  • FIG 3 schematically shows in a perspective view the heat pump 62 and 64, resp., of Figure 2 .
  • the heat pipes 66 and 68 open with their end portions leading away from the Peltier elements into a heat spreader 78 via which heat is discharged over a large area from the heat pipes 66 and 68 and to which process air 48 of Figure 2 is supplied.
  • the heat pipes 66 and 68 resp., penetrate the heat spreader 78 approximately centrally with their legs 72.
  • a heat spreader 80 and 82, resp., is likewise associated above and below the Peltier elements of the heat pumps 62 and 64, thus the Peltier elements being sandwiched between the heat spreaders 80 and 82.
  • thermoelectric heat pump 62 or 64, respectively, of Figure 2 is illustrated in a schematic cross sectional view.
  • the heat pumps 62, 64 comprise a heat sink 84 consisting preferably of aluminium or copper and having a roughly rectangular cross section.
  • Peltier elements 86, 88 each are arranged which are adapted to be supplied with current via electrical connections that are not illustrated.
  • a respective cool side 90 and 92 of the Peltier elements 86 or 88, respectively, points away from the heat sink 84, while a hot side 94 and 96 of the Peltier elements 86 or 88, respectively, abuts on the heat sink 84.
  • the width of the Peltier elements 86 and 88 is somewhat smaller than that of the sink 84, and the Peltier elements 86, 88 are arranged approximately centrally with respect to the heat sink 84.
  • a heat spreader 80 or 82, respectively, having a rectangular cross section abuts on a respective cool side 90 or 92 of the Peltier elements 86 or 88, respectively.
  • the heat spreader 80, 82 may be an individual heat spreader or may be formed directly by the cold side heat sink 44, 46, eliminating the need for the additional component.
  • a width of the heat spreaders 80, 82 is somewhat larger than the width of the heat sink 84. Insulation elements 98 are arranged between the heat sink 84 and the respective heat spreader 80 and 82 next to the Peltier element 86 or 88, respectively.
  • Further insulation elements 100 are arranged between the heat spreaders 80 and 82.
  • a left and a right side face of the heat sink 84 are thermally insulated from the environment by the insulation elements 100.
  • FIG. 5 shows the heat exchanger 102 in an exploded view according to a second embodiment. For convenience, only some portions of the heat exchanger 102 in the cooling section 34 are shown.
  • the fins 104 and 106 of the layers 40 and 42, resp., are formed substantially V-shaped with respect to each other in contrast to the fins of Figure 2 .
  • a plurality of fins is integrally combined into modules 108. Crests 110 formed by two respective adjacent fins, two of which are provided with a reference numeral in Figure 5 , extend approximately in the direction of flow of the process air and are substantially adjacent to the plates 50, 52 and 54 in the mounted state.
  • the modules 108 are connected to the plates 50, 52 and 54 in a force-fit, form-fit and/or adhesively joined manner.
  • a width of the modules 108 in the direction of flow is formed such that the heat pumps 62 or 64 can be disposed there between.
  • the heat pumps 62 and 64 resp., do no longer penetrate the respective layer 40 and 42, resp., in contrast to the heat exchanger 16 of Figure 2 , but are arranged centrally of a respective layer.
  • the heat pipes 66 or 68 are guided transversely to the direction of flow between modules 108 to an edge area of the heat exchanger 102 and do not project from the same in contrast to Figure 2 . In the edge area the heat pipes 66 and 68 then extend further in the direction of flow along the modules 108 to the heating section 36.
  • the heating section 36 can be formed, substantially corresponding to the cooling section 34, to have plural modules of fins between which the heat pipes 66 and 68, resp., are guided through.
  • FIG. 6 shows a portion of the heat exchanger according to a third embodiment.
  • the upper layer 40 is represented in which a plurality of fins 114 arranged in V-shape is provided in the cooling and heating sections 34 and 36 so as to form flow passages.
  • the heat pump 62 is arranged centrally in the cooling section 34 between the fins 114, wherein, in contrast to the previous embodiments, two heat pipes 116 and 118 extend in the direction of flow of the process air 48 to the heating section 36 and thus are substantially shorter as a whole.
  • the heat pipes 116 and 118 are arranged at a parallel distance from each other and then open centrally into a heat spreader 120 disposed in the heat section 36.
  • FIG. 7 shows a strongly simplified representation of a top view on the heat exchanger 112 of Figure 6 .
  • the flow passages 122 formed by the fins 114 are in multiple fluid communications with one another.
  • the fluid communication takes place through rows of openings 124 to 130.
  • the openings 124 are formed upstream approximately ahead of the heat pump 62 in the cooling section 34 and the openings 126 are formed downstream approximately behind the heat pump 62.
  • the openings 128 are formed upstream ahead of the heat spreader 120 in the heating section 36 and the openings 130 are formed downstream behind the heat spreader 120.
  • the process air 48 represented by plural arrows in Figure 7 can be spread comparatively uniformly to the flow passages 122 passing the heat pump 62 so as to by-pass the heat pump 62 constituting an obstacle to flow.
  • FIG 8 shows a fourth embodiment of the heat exchanger 132, the layer 40 being represented in sections.
  • Fins 134 are disposed in the heat exchanger 132 at a parallel distance from each other and are connected to the plate 52 in the cooling section 34 via a common holding plate 136.
  • the fins 134 may also be of a folded fin construction so that plate 136 is not required.
  • Fins 137 of the heating section 36 are fixed to the heat pipe 138, on the other hand.
  • the U-shaped heat pipe 138 extends in the cooling section 34 with the first leg 140 approximately transversely to the fins 134 outwardly from the heat pump 62 approximately centrally in the cooling section 34.
  • the heat pipe 138 then extends with its connecting portion 144 between the leg 140 and the further leg 146 from the cooling section 34 to the heating section 36.
  • the leg 146 then extends transversely to the flow direction centrally through the heating section 36.
  • Fins 137 of the heating section 36 are fixed to the leg 146 of the heat pipe 138 in that the latter penetrates each of the fins 137 centrally through a through bore 151 introduced to the same and is pressed or welded, for instance, with the same.
  • the fins are bent at their longitudinal side facing away from the central plate 52 and having an angular portion 152, whereby they have an L-shaped cross section to improve the thermal contact with plate 58 and 60.
  • Figure 9 shows the heat pump 62 of the heat exchanger 132 in top view and side view. In the upper top view it is visible that the heat pipe 138 completely penetrates the heat pump 62. It is further visible in Figure 9 that the heat pump 62 forms a unit with the heat pipe 138 and the fins 137 fixed to the leg 146 which can be easily inserted in a heat exchanger 132 according to Figure 8 .
  • Figure 10 constitutes the heat pump 154 according to a further embodiment. It includes two L-shaped heat pipes 156, 158. They have a respective leg 160, 162 extending away from the heat pump 154 in the direction of flow of the process air, the legs extending at a parallel distance approximately centrally of a respective layer 40, 42, see Figure 2 .
  • the respective other legs 164 and 166 of the heat pipe 156 and 158 extend substantially transversely to the direction of flow of the process air and face away from each other.
  • the legs 164 and 166 extend approximately centrally of a respective layer 40 and 42 of the heating section 36, see e.g. Figure 2 .
  • respective fins 168 and 170 are fixed at a parallel distance from each other.
  • a respective fin 168 and 170 has a central through bore 172 and 174 through which the respective heat pipe 156 and 158 is guided.
  • the fins 168 and 170 are then fixed to the heat pipes 156 and 158 in a force-fit, form-fit and/or adhesively joined manner, for example by a soldering, pressing or adhesive connection.
  • FIG 11 shows a simplified diagram of the dishwasher 1. It includes, in contrast to the dishwasher 1 of Figure 1 , an additional air heater 176 disposed downstream of the heat exchanger 16 in the outlet passage 26.
  • the process air 48 can be further heated, before it enters the interior 4 of the dishwasher 1 again. This can benefit the system in conditions when the ambient conditions are cold so that the drying air is easily saturated. Increasing the air temperature reduces the relative humidity for a given specific humidity and thus makes the drying more efficient.
  • a power supply 178 is provided at which the heater 176 is connected electrically via wires 180 and the heat exchanger 16 is connected via electric wires 182.
  • a power flow in the wires 180 and 182 can be switched on and off by a respective switch 184 and 186.
  • the switches 184 and 186 are controlled via an Electronic Control Unit (ECU) 188.
  • ECU Electronic Control Unit
  • Plural sensors are connected to the same.
  • a sensor 190 is arranged upstream of the heat exchanger 16 in the inlet passage 22 for measuring the temperature and the air humidity of the process air in this area. The measuring signals of the sensor 190 are then guided through a measuring line 192 to the ECU 188.
  • another sensor 194 which is connected to the ECU 188 via a measuring line 196 is arranged for measuring the temperature and the air humidity of the process air.
  • a sensor 198 equally provided for measuring the temperature and the air humidity of the process air is arranged which is connected to a measuring line 200 to the ECU 188.
  • a temperature in the cooling section 34 of the heat exchanger 16 is detected via a sensor 202 and in the heating section 36 via a sensor 204 each of which is connected to the ECU 188 via a measuring line 206 and 208.
  • a sensor 209 is provided for measuring the temperature of the ambient air which is connected to the ECU 188 via a measuring line 211.
  • the ECU 188 then controls the electric switches 184 and 186 via a respective control wire 210 and 212 in response to the detected measuring signals.
  • the ECU 188 For the electric supply of the ECU 188 the latter is connected to the power supply 178 via electric lines 214.
  • a control algorithm is deposited which uses psychometric theory to determine the optimum operating point and whether the heater 176 is required during the drying cycle. Cooling of the process air then is controlled by the ECU 188 by switching on or off the power supply 178 via the switch 186.
  • the heater 176 is equally controlled by switching on or off the power supply 178 via the electric switch 184.
  • a dishwasher comprising a rinsing chamber for cleaning dishes.
  • the latter can be discharged from the rinsing chamber and can be dried and heated via a heat exchanger. Downstream of the heat exchanger the process air is supplied to the rinsing chamber.
  • the heat exchanger includes a heat pump for cooling and drying the process air, wherein waste heat of the heat pump is discharged through a heat pipe.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Washing And Drying Of Tableware (AREA)
EP11183858.7A 2011-10-04 2011-10-04 Thermoelektrische Wärmepumpe, Wärmetauscher, Haushaltsgerät und Verfahren zum Betreiben eines Haushaltsgeräts Not-in-force EP2578741B1 (de)

Priority Applications (3)

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EP11183858.7A EP2578741B1 (de) 2011-10-04 2011-10-04 Thermoelektrische Wärmepumpe, Wärmetauscher, Haushaltsgerät und Verfahren zum Betreiben eines Haushaltsgeräts
PL11183858T PL2578741T3 (pl) 2011-10-04 2011-10-04 Termoelektryczna pompa ciepła, wymiennik ciepła, urządzenie gospodarstwa domowego oraz sposób działania urządzenia gospodarstwa domowego
DK11183858.7T DK2578741T3 (en) 2011-10-04 2011-10-04 Thermoelectric heat pump, heat exchanger, home appliance and method of operating a home appliance

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CN104894801A (zh) * 2014-03-06 2015-09-09 Lg电子株式会社 衣物处理装置
US20150257627A1 (en) * 2014-03-17 2015-09-17 Samsung Electronics Co., Ltd. Household appliance having drying apparatus
CN106264409A (zh) * 2016-09-05 2017-01-04 佛山市顺德区美的洗涤电器制造有限公司 洗碗机的干燥***及洗碗机
EP3124682A1 (de) * 2015-07-27 2017-02-01 Electrolux Appliances Aktiebolag Wärmepumpentrockner
US20190383528A1 (en) * 2019-06-28 2019-12-19 Gavin Sung Hybrid thermal cooling system
US11672404B2 (en) 2020-10-07 2023-06-13 Whirlpool Corporation Dish treating appliance with an air supply circuit
JP7469181B2 (ja) 2020-08-20 2024-04-16 トヨタ自動車株式会社 ヒートパイプ恒温槽

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US11166618B2 (en) 2018-09-07 2021-11-09 Haier Us Appliance Solutions, Inc. Drying system with heat pipe and thermoelectric assembly

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US5649372A (en) * 1996-03-14 1997-07-22 American Dryer Corporation Drying cycle controller for controlling drying as a function of humidity and temperature
DE10334792A1 (de) * 2003-07-30 2005-02-24 BSH Bosch und Siemens Hausgeräte GmbH Geschirrspülmaschine
US20060254623A1 (en) * 2003-07-30 2006-11-16 Bsh Bosch Und Siemens Hausgerate, Gmbh Dishwasher comprising a heat tube
DE102004055926A1 (de) * 2004-11-19 2006-05-24 BSH Bosch und Siemens Hausgeräte GmbH Haushaltsgerät mit einer Trocknungseinheit
US20090044576A1 (en) * 2005-12-06 2009-02-19 BSH Bosch und Siemens Hausgeräte GmbH Apparatus and Method for Loading Items to Be Washed With an Air Flow
US20090049843A1 (en) * 2005-12-16 2009-02-26 BSH Bosch und Siemens Hausgeräte GmbH Domestic Appliance Comprising a Thermoelectric Heat Pump
WO2007138064A1 (en) 2006-05-31 2007-12-06 Arcelik Anonim Sirketi A dishwasher with an improved drying arrangement
WO2010003936A1 (en) * 2008-07-07 2010-01-14 Arcelik Anonim Sirketi A heat pump type dryer
DE102008043554A1 (de) 2008-11-07 2010-05-12 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Betreiben eines Geschirrspülmaschine
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CN104894801A (zh) * 2014-03-06 2015-09-09 Lg电子株式会社 衣物处理装置
US20150252517A1 (en) * 2014-03-06 2015-09-10 Lg Electronics Inc. Laundry treatment apparatus
US20150257627A1 (en) * 2014-03-17 2015-09-17 Samsung Electronics Co., Ltd. Household appliance having drying apparatus
KR20150108188A (ko) * 2014-03-17 2015-09-25 삼성전자주식회사 건조장치를 구비하는 가전제품
US10039434B2 (en) * 2014-03-17 2018-08-07 Samsung Electronics Co., Ltd. Household appliance having drying apparatus
EP3124682A1 (de) * 2015-07-27 2017-02-01 Electrolux Appliances Aktiebolag Wärmepumpentrockner
CN106264409A (zh) * 2016-09-05 2017-01-04 佛山市顺德区美的洗涤电器制造有限公司 洗碗机的干燥***及洗碗机
US20190383528A1 (en) * 2019-06-28 2019-12-19 Gavin Sung Hybrid thermal cooling system
US11649993B2 (en) * 2019-06-28 2023-05-16 Intel Corporation Hybrid thermal cooling system
JP7469181B2 (ja) 2020-08-20 2024-04-16 トヨタ自動車株式会社 ヒートパイプ恒温槽
US11672404B2 (en) 2020-10-07 2023-06-13 Whirlpool Corporation Dish treating appliance with an air supply circuit

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Publication number Publication date
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EP2578741B1 (de) 2017-04-12
PL2578741T3 (pl) 2017-08-31

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