EP2252736B1 - Sèche-linge à condensation, à régulateur thermique à changement d'état, et procédé d'exploitation correspondant - Google Patents

Sèche-linge à condensation, à régulateur thermique à changement d'état, et procédé d'exploitation correspondant Download PDF

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Publication number
EP2252736B1
EP2252736B1 EP09706603A EP09706603A EP2252736B1 EP 2252736 B1 EP2252736 B1 EP 2252736B1 EP 09706603 A EP09706603 A EP 09706603A EP 09706603 A EP09706603 A EP 09706603A EP 2252736 B1 EP2252736 B1 EP 2252736B1
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EP
European Patent Office
Prior art keywords
latent heat
cooling air
condensation dryer
storage medium
heat store
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.)
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Application number
EP09706603A
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German (de)
English (en)
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EP2252736A1 (fr
Inventor
Andreas Stolze
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.)
BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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Priority to PL09706603T priority Critical patent/PL2252736T3/pl
Publication of EP2252736A1 publication Critical patent/EP2252736A1/fr
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    • 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 

Definitions

  • the invention relates to a condensation dryer with a drying chamber for objects to be dried, a process air duct in which there is an electric heater, a heat exchanger and a fan, a latent heat storage and a cooling air duct and a preferred method for its operation.
  • a tumble dryer whose operation is based on the condensation of the evaporated by means of warm process air moisture from the laundry - a so-called condensation dryer - unlike a so-called exhaust air dryer, the heated air once passes through the wet laundry and then expels, no exhaust hose for leading out the exhaust air
  • Exhaust air dryers and condensation dryers are collectively referred to herein as dryers, unless the context requires otherwise.
  • process air is passed through a fan via a heater in a wet laundry containing drum as a drying chamber. The hot air absorbs moisture from the laundry to be dried. After passing through the drum, the now moist process air is directed into a heat exchanger, which is usually preceded by a lint filter.
  • the moist process air is cooled, so that the water contained in the moist process air condenses.
  • the condensed water is then usually collected in a suitable container and the cooled and dried process air fed back to the heater and then the drum (circulating air dryer) or in the installation room of the dryer (exhaust air dryer).
  • the DE 37 10 710 A1 describes a condensation clothes dryer with a closed recirculation circuit in which a circulating air fan, an electric air heater, a laundry container, a heat exchanger and a latent heat storage are arranged with a storage medium, wherein the latent heat storage is in the recirculation loop between the heat exchanger and the electric air heater.
  • the latent heat storage stores at least partially the heat energy dissipated by the moist, warm process air from the drying chamber. If the entire content of the latent heat storage medium has melted on storage medium and the coolant supply to the heat exchanger must be turned on, the electric air heater can be throttled or turned off because the latent heat storage can be used to heat the process air.
  • the DE 102 24 940 A1 discloses a condensation dryer with a drying chamber, a closed process air circuit, a process air blower, a heater and a removably arranged in the process air circuit latent heat storage. This replaces the common, air-working heat exchanger.
  • the removably arranged latent heat accumulator can be discharged separately from the dryer.
  • a washing machine or dishwasher which has a tub and a heat exchanger, wherein a primary circuit of the heat exchanger in the course of leading from the tub sewer and a secondary circuit in the course of leading into the tub fresh water line.
  • the heat exchanger has a cavity filled with a latent thermal energy storage medium in contact with the primary and secondary circuits in a manner that does not mix the medium with the contents of the primary and secondary circuits or the contents of the primary and secondary circuits in each case a maximum possible exchange of heat energy between the content in the primary circuit and the medium on the one hand and between the medium and the content in the secondary circuit on the other hand can take place.
  • the moist, warm process air heats the cooling medium in one Heat exchanger (eg air-air heat exchanger), without the heat contained in the heated cooling medium is recovered.
  • one Heat exchanger eg air-air heat exchanger
  • the object of the present invention is therefore to improve the energy efficiency in a different way in a condensation dryer with latent heat storage.
  • a condensation dryer in which an air-to-air heat exchanger is used, the heat energy released during the cooling of the moist process air to the cooling air can be utilized.
  • the invention thus relates to a condensation dryer with a drying chamber for objects to be dried, a process air duct in which there is an electric heater, a heat exchanger and a blower, a latent heat storage and a cooling air duct, wherein the latent heat storage is arranged in the cooling air duct.
  • the stored in the latent heat storage by cooling of heated cooling air heat energy can be used to heat process air in the process air duct and / or the drying chamber. According to the invention it is preferred if the heating of the process air in the drying chamber, i. as a result of a heat exchange between latent heat storage and drying chamber takes place.
  • a surface of the latent heat accumulator facing away from the cooling air channel is spaced from the drying chamber by a maximum of 5 cm, preferably a maximum of 3 cm and particularly preferably a maximum of 2 cm.
  • the surface of the latent heat accumulator facing away from the cooling air channel is concave.
  • a distance between the concave surface and an outer surface of the drying chamber is between 0.5 and 5 cm.
  • the latent heat storage used according to the invention generally contains a storage medium for heat energy, wherein the storage medium is preferably surrounded by a good thermal conductivity latent heat storage wall.
  • the latent heat accumulator used in the condensation dryer according to the invention preferably has ribs on a surface of the latent heat accumulator facing the cooling air passage. These ribs can serve to guide the cooling air through the latent heat storage. Alternatively or additionally, the ribs may be filled with a storage medium.
  • the latent heat storage is rotatable about an axis.
  • the latent heat storage is preferably cylindrical.
  • the rotation axis of the cylindrical latent heat accumulator is particularly preferably parallel to a rotation axis of the drying chamber.
  • the latent heat storage is driven by a drum as a drying chamber. This allows a better heat transfer from the heated cooling air to the latent heat storage but also take place from the latent heat storage on the drying chamber.
  • a temperature sensor is arranged in the cooling air passage in front of and behind the latent heat storage.
  • the temperatures measured by the two temperature sensors allow a determination of the state of charge of the latent heat accumulator.
  • state of charge means the extent of the phase transition from the liquid to the solid state in the storage medium of the latent heat storage.
  • the state of charge is thus a measure of the ability of the latent heat storage for storing heat energy.
  • the temperature sensors are preferably connected to a control device which automatically triggers a shutdown or connection of the electric heater.
  • the latent heat store contains a storage medium with a phase transition from the liquid to the solid state in the temperature range of 30 to 65 ° C, more preferably in the temperature range of 35 to 60 ° C and most preferably in the temperature range of 45 to 55 ° C.
  • the latent heat storage contains a storage medium containing an inorganic salt hydrate and / or an organic compound.
  • the storage medium used contains a salt hydrate, wherein the salt hydrate preferably contains at least one salt selected from the group consisting of sodium acetate, sodium thiosulfate, magnesium nitrate and magnesium chloride.
  • potassium nitrate, ammonium nitrate and lithium nitrate may also be used.
  • a storage medium in the latent heat storage and a mixture of organic and inorganic compounds can be used.
  • An example of this is a mixture of 80 wt .-% acetamide and 20 wt .-% NaNO 3 with a melting point of 59 ° C.
  • the melting point of the storage medium corresponds to the discharge temperature of the latent heat storage.
  • the volume flow and the power of the air-to-air heat exchanger are generally tuned to the discharge temperature, so that the difference between the discharge temperature and the temperature of the cooling air at the exit from the heat exchanger is sufficiently large to allow efficient charging of the latent heat storage.
  • This temperature difference is generally 3 to 25 ° C, preferably 5 to 20 ° and most preferably 8 to 15 ° C. Under these conditions, the heat exchange is particularly favorable.
  • the storage media which can be used in accordance with the invention show a more or less pronounced tendency to hypothermia, which are described in so-called hot packs, as described, for example, in US Pat. can be used as a pocket warmer, find application. In these, heat energy is deliberately released by triggering a crystallization process in the supercooled solution at temperatures below the melting point (discharge temperature).
  • a storage medium in the form of a supercooled solution can be used according to the invention.
  • a nucleating agent is added to the storage medium.
  • a nucleating agent is, for example, a solid substance which is dispersed in the storage medium and chemically inert with respect to the storage medium and which does not melt at any temperature which can be expected in the latent heat store and which thus represents seeds from which the storage medium passing into the solid phase can form crystals. Examples include quartz (silica) and talc (magnesium silicate). The person skilled in the art is aware of suitable nucleating agents for various storage media.
  • the latent heat storage of the inventive Condensation dryer in its interior means for generating a flow in the storage medium.
  • the air-air heat exchanger is removable. This is particularly advantageous because a removable heat exchanger can be cleaned more easily from lint.
  • the latent heat storage is removable.
  • the discharge of the latent heat storage can then take place independently of the condensation dryer.
  • the invention also relates to a method for operating a condensation dryer with a drying chamber for objects to be dried, a process air duct in which there is an electric heater, a heat exchanger and a blower, a latent heat storage and a cooling air duct, wherein the latent heat storage is arranged in the cooling air duct, and wherein when the electric heater is switched on in the heat exchanger heated cooling air is fed to the storage medium containing latent heat storage and the latent heat storage is charged by heat energy contained in the heated cooling air is stored in the storage medium.
  • a phase transition in the storage medium from solid to liquid is used for the storage of the heat energy contained in the heated cooling air.
  • the storage of thermal energy is carried out until the phase transition in the storage medium is completed from solid to liquid.
  • the electric heater is switched off after completion of the phase transition.
  • the temperature of the process air and the cooling air generally decreases.
  • the process air in the drying chamber is then heated by the heat energy stored in the storage medium.
  • the drying of laundry in the drying chamber then generally takes place at a lower temperature level than with the exclusive use of an electric heater.
  • process air and cooling air are passed through the heat exchanger in a crossflow or countercurrent process.
  • the invention has the advantage that a condensation dryer with a latent heat storage can be operated with higher efficiency.
  • the invention allows the operation of a condensation dryer at a relatively high ambient temperature at which a discharge of heated cooling air in the installation room of the dryer is not desirable.
  • FIGS. 1 and 2 Further details of the invention will become apparent with reference to the FIGS. 1 and 2 from the following description of a non-limiting embodiment of the condensation dryer according to the invention and the method for operating this condensation dryer.
  • FIG. 1 shows a vertically cut condensation dryer (hereinafter abbreviated to "dryer”) according to an embodiment of the invention, in which a latent heat storage in the cooling air duct is arranged in the immediate vicinity of the drying chamber.
  • dryer vertically cut condensation dryer
  • FIG. 2 shows a section of a condensation dryer according to the invention, in which the arrangement of a provided with ribbed latent heat storage in the immediate vicinity of the drying chamber can be seen even more clearly.
  • the in FIG. 1 shown dryer 1 has a drum rotatable about a horizontal axis as a drying chamber 2, are mounted within which driver 15 for moving laundry during a drum rotation.
  • Process air is guided by means of a blower 6 in the process air duct 3 via an electric heater 4 through the drum 2.
  • the process air laden with moisture in the process air duct 3 is passed through an air-air heat exchanger 5, where a heat exchange with cooling air, which originates from a cooling air inlet 16 takes place.
  • the Process air cools down by condensation of the moisture contained in it and is in turn passed through the fan 6 and the electric heater 4 in the drying chamber 2, whereby the process air circuit is closed.
  • the condensed moisture is in an in Fig. 1 collected condensate tank, not shown.
  • the heated in the air-air heat exchanger 5 cooling air is passed through a latent heat storage 7, where it is cooled by transfer of heat energy from the heated cooling air to a storage medium.
  • the storage medium not shown in detail here is a salt hydrate, which can store heat energy by a phase transition from solid to liquid.
  • the cooled cooling air is then passed through a cooling air outlet 17 into the installation room of the dryer 1.
  • the temperature difference is transmitted to a control device 22, which evaluates it with regard to the charging of the latent heat accumulator 7 and causes a shutdown of the electric heater 4.
  • the temperature of the entering into the drying chamber 3 process air drops down and the drying is continued due to the heat transfer from the latent heat storage 7 to the drying chamber 3 at a lower temperature level.
  • the distance between the drying chamber 2 and the latent heat storage 7 of 5 to 10 mm.
  • the electric heater 4 can be turned on again. Thereafter, the temperature of the process air and thus the cooling air rises after passing through the air-air heat exchanger 5, so that the latent heat storage 7 is recharged.
  • the drum 3 is in the in Fig. 1 shown embodiment at the rear bottom by means of a pivot bearing and front mounted by means of a bearing plate 20, wherein the drum 3 rests with a brim on a sliding strip 21 on the bearing plate 20 and is held at the front end.
  • the control of the dryer via the control device 22, which can be controlled by the user via an operating unit 23.
  • Fig. 2 shows a section of a condensation dryer 1 according to the invention, in which the arrangement of a provided with ribs 12 latent heat accumulator 7 in the immediate vicinity of the drying chamber 2 can be seen even more clearly.
  • ribs 12 are arranged on the cooling air channel 8 facing surface 11 of the latent heat accumulator 7 .
  • the cooling air channel 8 facing away from the surface 9 of the latent heat accumulator 7 is concave and shaped so that it has the same width as the drying chamber 2, from the outer surface 10, it has a distance of 5 to 10 mm.
  • 24 means a deflector, which deflects the cooling air exiting horizontally from the air-air heat exchanger 5 upwards.
  • the arrows indicate the flow direction of the cooling air.
  • the latent heat storage 7 is designed in this embodiment as a removable part.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Drying Of Solid Materials (AREA)

Claims (16)

  1. Sèche-linge à condensation (1) doté d'une chambre sèche (2) pour des objets à sécher, d'un conduit d'air de traitement (3), dans lequel se trouvent un chauffage (4) électrique, un échangeur de chaleur (5) et une soufflerie (6), d'un accumulateur de chaleur latente (7) et d'un conduit d'air de refroidissement (8),
    caractérisé en ce que l'accumulateur de chaleur latente (7) est disposé dans le conduit d'air de refroidissement (8).
  2. Sèche-linge à condensation (1) selon la revendication 1, caractérisé en ce qu'une surface (9), opposée au conduit d'air de refroidissement (8), de l'accumulateur de chaleur latente (7) est espacée au maximum de 5 cm de la chambre sèche (2).
  3. Sèche-linge à condensation (1) selon la revendication 2, caractérisé en ce que la surface (9), opposée au conduit d'air de refroidissement (8), de l'accumulateur de chaleur latente (7) est concave.
  4. Sèche-linge à condensation (1) selon la revendication 3, caractérisé en ce qu'un espacement entre la surface (9) concave et une surface (10) extérieure de la chambre sèche (2) se situe entre 0,5 et 5 cm.
  5. Sèche-linge à condensation (1) selon l'une des revendications 1 à 4, caractérisé en ce qu'une surface (11), tournée vers le conduit d'air de refroidissement (8), de l'accumulateur de chaleur latente (7) présente des nervures (12).
  6. Sèche-linge à condensation (1) selon la revendication 1 ou 2, caractérisé en ce que l'accumulateur de chaleur latente (7) peut tourner autour d'un axe.
  7. Sèche-linge à condensation (1) selon la revendication 6, caractérisé en ce que l'accumulateur de chaleur latente (7) est cylindrique.
  8. Sèche-linge à condensation (1) selon l'une des revendications 1 à 7, caractérisé en ce qu'un capteur de température (13, 14) est disposé à chaque fois dans le canal d'air de refroidissement (8) en amont et en aval de l'accumulateur de chaleur latente (7).
  9. Sèche-linge à condensation (1) selon l'une des revendications 1 à 8, caractérisé en ce que l'accumulateur de chaleur latente (7) contient un fluide accumulateur avec une transition de phase de l'état liquide dans l'état solide dans la plage de températures de 30 à 65°C.
  10. Sèche-linge à condensation (1) selon l'une des revendications 1 à 8, caractérisé en ce que l'accumulateur de chaleur latente (7) contient un fluide accumulateur, qui contient au moins un hydrate de sel inorganique et/ou un composé organique.
  11. Sèche-linge à condensation (1) selon la revendication 10, caractérisé en ce qu'on utilise un hydrate de sel, qui contient au moins un sel provenant du groupe, qui est constitué de thiosulfate de sodium, de nitrate de magnésium et de chlorure de magnésium.
  12. Sèche-linge à condensation (1) selon l'une des revendications 1 à 11, caractérisé en ce que l'accumulateur de chaleur latente (7) présente dans son espace intérieur des moyens pour générer un écoulement dans le fluide accumulateur.
  13. Procédé pour faire fonctionner un sèche-linge à condensation (1) doté d'une chambre sèche (2) pour des objets à sécher, d'un conduit d'air de traitement (3), dans lequel se trouvent un chauffage (4) électrique, un échangeur de chaleur (5) et une soufflerie (6), d'un accumulateur de chaleur latente (7) et d'un conduit d'air de refroidissement (8), l'accumulateur de chaleur latente (7) étant disposé dans le conduit d'air de refroidissement (8),
    caractérisé en ce que, lorsque le chauffage (4) électrique est allumé, de l'air de refroidissement réchauffé dans l'échangeur de chaleur est guidé sur l'accumulateur de chaleur latente (7) contenant un fluide accumulateur et l'accumulateur de chaleur latente (7) est rechargé du fait que de l'énergie thermique contenue dans l'air de refroidissement réchauffé est stockée dans le fluide accumulateur.
  14. Procédé selon la revendication 13, caractérisé en ce qu'une transition de phase dans le fluide accumulateur de solide en liquide est utilisée pour le stockage de l'énergie thermique contenue dans l'air de refroidissement réchauffé.
  15. Procédé selon la revendication 14, caractérisé en ce que le stockage de l'énergie thermique est effectué jusqu'à ce que la transition de phase dans le fluide accumulateur de solide en liquide soit achevée.
  16. Procédé selon la revendication 15, caractérisé en ce que le chauffage électrique (4) est déconnecté après la fin de la transition de phase et le réchauffement de l'air de traitement dans la chambre sèche (2) s'effectue au moyen de l'énergie thermique stockée dans le fluide accumulateur.
EP09706603A 2008-01-28 2009-01-16 Sèche-linge à condensation, à régulateur thermique à changement d'état, et procédé d'exploitation correspondant Active EP2252736B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09706603T PL2252736T3 (pl) 2008-01-28 2009-01-16 Suszarka kondensacyjna z zasobnikiem ciepła utajonego oraz sposób jej eksploatacji

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008006348A DE102008006348A1 (de) 2008-01-28 2008-01-28 Kondensationstrockner mit einem Latentwärmespeicher sowie Verfahren zu seinem Betrieb
PCT/EP2009/050466 WO2009095318A1 (fr) 2008-01-28 2009-01-16 Sèche-linge à condensation, à régulateur thermique à changement d'état, et procédé d'exploitation correspondant

Publications (2)

Publication Number Publication Date
EP2252736A1 EP2252736A1 (fr) 2010-11-24
EP2252736B1 true EP2252736B1 (fr) 2012-01-11

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EP (1) EP2252736B1 (fr)
AT (1) ATE541078T1 (fr)
DE (1) DE102008006348A1 (fr)
PL (1) PL2252736T3 (fr)
WO (1) WO2009095318A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009046547A1 (de) * 2009-11-09 2011-05-12 BSH Bosch und Siemens Hausgeräte GmbH Trockner mit einer Trocknungskammer für zu trocknende Gegenstände und einem Latentwärmespeicher
DE102012208619A1 (de) 2012-05-23 2013-11-28 BSH Bosch und Siemens Hausgeräte GmbH Verfahren zum Betrieb eines Trockners mit einem Latentwärmespeicher, sowie hierzu geeigneter Trockner
DE102012210238B4 (de) * 2012-06-18 2017-01-12 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Latentwärmespeichermaterialien auf der Basis von Aluminiumsulfat-Hydraten und deren Verwendung
DE102012223613A1 (de) 2012-12-18 2014-06-18 BSH Bosch und Siemens Hausgeräte GmbH Haushaltsgerät mit effizientem Latentwärmespeicher sowie Verfahren zu seinem Betrieb
DE102014217341B4 (de) 2014-08-29 2023-02-09 BSH Hausgeräte GmbH Latentwärmespeicher für ein Haushaltsgerät
DE102017200173A1 (de) 2017-01-09 2018-07-12 BSH Hausgeräte GmbH Haushaltsgerät mit Latentwärme-Speicherkörper, Latentwärme-Speicherkörper sowie Verfahren zu deren Betrieb bzw. Herstellung
KR20210129870A (ko) * 2020-04-21 2021-10-29 엘지전자 주식회사 세탁물 건조기

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DE3710710A1 (de) 1987-03-31 1988-10-13 Philips Patentverwaltung Kondensations-waeschetrockner
DE4340065A1 (de) * 1993-11-24 1995-06-01 Bosch Siemens Hausgeraete Verfahren zum Regenerieren eines hygroskopischen Materials in einem Wäschetrockner
DE4403737A1 (de) * 1994-02-07 1995-08-10 Bosch Siemens Hausgeraete Wasch- oder Geschirrspülmaschine mit einem Wärmetauscher
ATE212817T1 (de) * 1995-12-09 2002-02-15 Whirlpool Co Verfahren zur energieeinsparung in haushaltsgeräten und gerät mit verbessertem energiewirkungsgrad
DE19622882C2 (de) * 1996-06-07 2000-05-18 Aeg Hausgeraete Gmbh Geschirrspülmaschine
DE10224940A1 (de) 2001-06-22 2003-02-27 Miele & Cie Kondensationswäschetrockner

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DE102008006348A1 (de) 2009-07-30
PL2252736T3 (pl) 2012-06-29
WO2009095318A1 (fr) 2009-08-06
ATE541078T1 (de) 2012-01-15
EP2252736A1 (fr) 2010-11-24

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