EP2203586A1 - Laundry dryer having a distributor for condensate, and a method of operating the same - Google Patents
Laundry dryer having a distributor for condensate, and a method of operating the sameInfo
- Publication number
- EP2203586A1 EP2203586A1 EP08803827A EP08803827A EP2203586A1 EP 2203586 A1 EP2203586 A1 EP 2203586A1 EP 08803827 A EP08803827 A EP 08803827A EP 08803827 A EP08803827 A EP 08803827A EP 2203586 A1 EP2203586 A1 EP 2203586A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- process air
- dryer
- heat
- air
- exhaust
- 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
Links
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
-
- 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
- D06F58/24—Condensing arrangements
Definitions
- the invention relates to a dryer with a drying chamber for the objects to be dried and a process air duct in which a fan for driving process air through the drying chamber and a heat exchanger arrangement are located, through which heat exchanger arrangement of the effluent from the drying chamber process air heat extractable and the
- the process air duct has a supply air opening for drawing in process air from an environment of the dryer, an exhaust opening for expelling process air into the environment of the dryer and an exhaust air duct part through which process air to the exhaust port can be guided and which one Distributor, through which condensate, which was deposited in the heat exchanger assembly from the process air, is distributed in the flowing process air having.
- the invention also relates to a method for operating such a dryer.
- the heat exchanger arrangement may be a simple heat exchanger or a heat pump.
- a dryer with heat recovery is apparent from DE 30 00 865 A1.
- a so-called exhaust air dryer is described which once heated an air flow in an open channel and passes through the laundry to be dried, and then ejects it from the channel.
- the heat recovery takes place by means of a simple heat exchanger in which heat is transferred from the process air to be discharged to newly inflowing process air.
- the heated process air in the heat exchanger is further heated by a heater and then passes to the laundry to be dried.
- WO 2004/059070 A1 discloses a dryer in which an atomizer, in particular ultrasonic atomizer, is provided, with which a liquid can be distributed in the process air supplied to the objects to be dried or treated.
- a tumble dryer is operated as an exhaust air dryer or as a condensation dryer.
- An exhaust air dryer passes heated air once through the laundry to be dried and carries this moisture-laden air through an exhaust hose from the exhaust air dryer and from the room in which it is placed.
- a condensation dryer the operation of which is based on the condensation of moisture evaporated by means of warm process air from the laundry, requires no exhaust hose and allows energy recovery from the heated process air, for example by using a heat pump.
- a clothes dryer is described with a heat pump circuit, which is basically designed as a condensation dryer and in which a supply air opening is arranged in the process air duct between a condenser and an evaporator of the heat pump circuit, which is closable with a controllable closure device.
- an exhaust air dryer In the case of an exhaust air dryer, the air laden with moisture after the passage through the drum with the laundry items is generally led out of the dryer. Compared to a condensation dryer, an exhaust air dryer can be made simpler and thus cheaper. An exhaust air dryer draws air from its environment during operation and uses it directly for drying.
- heat recovery is also possible in an exhaust air dryer, but any such heat recovery implies a cooling of the exhaust air, whereby condensate can precipitate out of the exhaust air and have to be disposed of.
- ambient air of, for example, 20 ° C. and 60% relative humidity, so-called supply air
- supply air flows over heat exchanger surfaces of the air-to-air heat exchanger and is heated there by cooling the warm process air coming from the drying chamber.
- condensate which is collected in a container or pumped out.
- an emptying is necessary
- a connection to the sewage network In the first case an emptying is necessary, and in the second case a connection to the sewage network.
- the amount of accumulating condensate is a measure of the heat energy emitted in the heat exchanger and thus a measure of the improvement of energy efficiency.
- Object of the present invention is therefore to provide a dryer of the type mentioned, in which it is unnecessary to use the heat of a portion of the discharged process air to dissipate condensate incurred. It is also intended to provide a corresponding generic method.
- the invention thus relates to a dryer with a drying chamber for the objects to be dried and a process air duct in which a blower for driving process air through the drying chamber and a heat exchanger assembly are, through which heat exchanger assembly of the drying chamber
- the process air duct has a Zu Kunststoffö réelle for drawing process air from an environment of the dryer, an exhaust port for expelling process air into the environment of the dryer and an exhaust duct part through which process air to the exhaust port is feasible and which has an expensive, by which condensate, which was deposited in the heat exchanger assembly from the process air, in the flowing process air can be distributed, wherein the manifold is a nebulizer.
- the condensate separated during drying in this dryer is a measure of the return of heat energy in the drying process.
- the return of heat in particular be sized and adjusted by appropriate design of the dryer that a predetermined improvement in energy balance is achieved, for example, an improvement by which a classification of the dryer in a desired , compared to the exhaust air dryer, which is expected to be better energy consumption class according to the usual system in the European Union would be possible.
- it may be disregarded to seek a deposition of a maximum of moisture in the heat exchanger assembly.
- the drying chamber In operation, in particular the drying chamber must be sealed against the environment of the dryer to allow undisturbed proper flow of process air.
- the drying chamber by means of a corresponding closed the door. Apart from such use, this door is usually open and thus also opens the process air duct to the environment of the dryer. A draft of air through the process air duct, including the subchannel and the open door, can effectively aid the distribution of residual condensate.
- the nebuliser is an ultrasonic nebulizer.
- Ultrasonic nebulizers are known and available as compact, integrated and effective components, and can be integrated into a tumble dryer without requiring much space. They are used in many applications, for example in humidifiers and inhalers.
- the heat exchanger arrangement has a heat sink and a heat source of a heat pump cycle, that is, the dryer according to this development uses a heat pump circuit for supplying and removing heat to or from the process air stream.
- any heat pump can be used.
- An advantage of the heat pump is that temperature levels for cooling or heating the process air can be selected with some independence from each other.
- the heat exchanger arrangement in the dryer according to the invention preferably has an evaporator and a condenser of a known heat pump circuit, wherein such a heat pump circuit is designed according to the principle of the compressor heat pump.
- a heat pump cycle comprises a self-contained line system for circulating a refrigerant therein, in which line system the heat sink as evaporator for the refrigerant, a compressor for compressing the evaporated refrigerant, the heat source as a condenser for the compressed refrigerant and a throttle for relaxing the liquefied refrigerant are arranged.
- Refrigerants come in accordance with per se known practice, in particular fluorinated ethane derivatives as well as propane and carbon dioxide into consideration.
- the cooling of the warm, moisture-laden process air essentially takes place in the evaporator of the heat pump, where the heat transferred is used to evaporate the refrigerant.
- the refrigerant vaporized due to the heating is supplied to the condenser via the compressor, where heat is released due to the condensation of the gaseous refrigerant and used to heat the process air.
- the refrigerant circulates in a closed circuit in which it passes from the condenser via a throttle back to the evaporator.
- An embodiment of the dryer in which the exhaust air duct part is set up for storing condensate is also preferred. It is assumed that the absorption capacity of the exhaust air duct part flowing through during operation of the dryer process air for additional moisture is not always the same.
- the process air flow in the drying chamber still absorbs little moisture and can therefore take up and remove condensate that is left over from a previous drying process.
- the process air flow removes a relatively large amount of moisture from the objects to be dried and therefore can absorb less condensate; So it is advantageous if condensate that can not be distributed evenly, initially can remain stored.
- the exhaust air duct part to a collecting vessel for collecting the condensate.
- This collecting vessel may further preferably simply be a depression of the exhaust air duct part.
- the exhaust air duct part may, with further preference, have at least one wall region which is inclined towards the recess and which may be designed in particular as a groove or duct.
- Particularly preferred is a development of the dryer, in which the collecting vessel is arranged below the heat exchanger assembly, so that accumulating condensate can instantly drip.
- the collecting vessel can more preferably also be designed as a type of bypass of the exhaust air duct part in order to selectively guide a part of the process air stream for collecting condensate, which is additionally nebulized by the nebulizer, through the collecting vessel.
- the collecting vessel has a respect to the process air flow upstream first opening to the exhaust duct part and a respect to the process air flow downstream second opening to the exhaust duct part and the heat exchanger assembly, in particular the heat sink, at least partially bridged in the exhaust duct part.
- a fill level sensor is assigned to the collecting vessel.
- the collecting vessel can be designed so that it can be removed from the dryer for the purpose of cleaning or otherwise disposing of condensate.
- the process air duct is an open channel leading from the supply air opening to the exhaust air opening.
- the dryer according to the invention in which an at least partial circulation of the process air would not be excluded in principle, perfected as exhaust air dryer.
- the process air duct has a heater.
- this heating can only be provided for heating the corresponding components of the dryer and the moist objects placed in the drum at the beginning of a drying process, wherein the drying process continues after the heating without using the heating.
- the heat pump circuit only with a relatively small pumping power and at least to introduce the heat necessary for the drying process to a substantial extent via the permanently operated heating.
- the heater provides further considerable flexibility in the design of the dryer according to the invention and in particular the option to optimize the dryer under a variety of economic aspects.
- the heater may in particular be an electric heating element or a burner for oil or gas according to conventional practice.
- the invention also provides a method for operating a dryer with a drying chamber for the objects to be dried and a process air duct in which a blower for driving process air through the drying chamber and a heat exchanger arrangement are located, through which heat exchanger arrangement of the effluent from the drying chamber Process air withdrawn heat and the process air supplied to the drying chamber is supplied, wherein the process air duct has a Zu Kunststoffö réelle for drawing process air from an environment of the dryer, an exhaust port for expelling process air in the environment of the dryer and an exhaust duct part through which process air to the exhaust port in which is distributed through a manifold condensate, which was deposited in the heat exchange arrangement of the process air in the flowing process air, wherein the distribution of the condensate by misting he follows.
- Preferred embodiments of the method provide that the atomization takes place by the action of ultrasound, or that the removal of heat from the process air flowing from the drying chamber and the supply of heat to the process air flowing to the drying chamber by a heat pumping process in the heat exchanger arrangement respectively.
- FIG. 1 shows a sketch for an embodiment of a dryer with a distributor for condensate
- Fig. 3 is a sketch for a second embodiment of the exhaust duct part.
- the dryer 1 illustrated in a sketch in FIG. 1 has a process air channel 2 and a drying chamber 3, which is a drum 3 rotatable about an axis 4 shown as a small cross.
- Process air flowing in the process air stream is guided by means of a blower 5 through the drum 3 and laundry items (not shown) located therein; behind the drum 3, the process air passes through a lint filter 6, which in the simplest case is a lattice-shaped sieve 6, to lint, ie small fibers, which process air entrains the entrained by the rotation of the drum 3 against each other laundry pieces and entrains.
- a lint filter 6 which in the simplest case is a lattice-shaped sieve 6, to lint, ie small fibers, which process air entrains the entrained by the rotation of the drum 3 against each other laundry pieces and entrains.
- the process air is drawn through a supply air opening 7 in the process air duct 2 and pushed out through an exhaust port 8.
- air passes directly from an environment of the dryer 1.
- an exhaust hose 9 With which the exhaust air from the dryer 1 away and from a building in which it is placed, is discharged.
- the dryer 1 in construction and function corresponds to a conventional exhaust air dryer.
- a heat exchange arrangement 10, 11 is present; in her or the associated heat source 1 1, the retracted through the supply air opening 7 process air is heated.
- the heated process air is passed into the drum 3, where it comes into contact with the laundry to be dried and then flows to the lint filter 6. Then the moist, warm and freed of any fluff process air is cooled in the heat sink 10.
- the heat withdrawn from the process air is passed from the heat sink 10 to the heat source 11 in a heat pump circuit 10 to 14, whose components include the heat sink 10 and the heat source 11, and is supplied there to the freshly fed process air.
- the heat pump circuit 10 to 14 is formed by an evaporator 10, which acts as a heat sink 10, and the condenser 11, which acts as a heat source 11, and a throttle 12 and a compressor 13, all of which via a closed line system 14 to a circuit with each other
- a refrigerant to be cyclically vaporized, to be compressed, liquefied and to be expanded circulates.
- This is a fluorinated ⁇ thanderivat, for example, under the name R134a pertinent known compound, propane or carbon dioxide.
- Gas refrigerant leaving the evaporator 10 is compressed and heated by the compressor 13; It passes to the condenser 1 1, where it liquefies by giving off heat to the process air.
- the process air flow is used, in which the condensate is distributed in an exhaust duct part 15 of the process air duct 2 immediately in front of the exhaust port 8 - see also Figures 2 and 3 together with the accompanying explanation.
- Condensate, which is obtained at the evaporator 10 passes through a corresponding conduit or channel or a correspondingly inclined wall portion 16 to a manifold 17, which is an ultrasonic atomizer 17.
- a natural gradient which can be formed by a corresponding design of the exhaust air duct part 15.
- the process air stream absorbs atomized condensate and discharges it through the exhaust air opening 8 and the exhaust air hose 9.
- Means for controlling the nebulizer 17 are not shown, as well as means for driving other components of the dryer 1. Such means are basically known, it is therefore unnecessary to go into detail here.
- a particular advantage of the nebuliser 17 is that it allows the condensate to be distributed in the process air without the process air having to fulfill specific thermodynamic requirements, in particular having a certain elevated temperature and a certain reduced relative humidity in order to be present as a liquid Evaporate condensate and absorb it.
- the removal of the condensate takes place as a mist, that is as a dispersion of liquid in gas.
- the limited life of a mist is of lesser importance - it is quite sufficient that the mist substantially exists until it has come out of the dryer 1 and through the exhaust hose 9 from the vicinity of the dryer 1.
- the heater shown in Figure 1 between the fan 5 and the drum 3 18, in this case an electric heating element 18, depending on the size of the pump power of the heat pump circuit 10 to 14 may be provided only for heating the corresponding components of the dryer 1 and in the drum. 3 inserted moist objects at the beginning of a drying process, wherein the drying process continues after heating without using the heater 18; It is also possible to design the heat pump cycle 10 to 14 only with a relatively small pumping power and to introduce the heat required for the drying process into a more or less significant proportion via the permanently operated heater 18.
- the specific design of the dryer 1 between these extremes is a matter of consideration, which also takes into account economic aspects - the heat pump cycle 10 to 14 is a major cost factor for the dryer 1, the price of which remains smaller the smaller the heat pump cycle 10 to 14 is. Ultimately, there is a trade-off between an acceptable price and an acceptable level of heat recovery in the dryer 1.
- FIG 2 shows a simple embodiment for the exhaust duct part 15.
- Condensate which drips from the heat sink 10, passes according to the given by the inclined wall portion 16 slope to the collecting vessel 18, which is only a recess 18 containing the ultrasonic nebulizer 17.
- the condensate atomized by the ultrasonic fan 17 passes into the process air stream symbolized by a thick arrow, after it has flowed through the heat sink 10, and is discharged therefrom from the exhaust air duct part 15.
- a separate, possibly for the purpose of cleaning or otherwise disposal of any remaining condensate removable collecting vessel 18 is provided in the exhaust duct part 15.
- the collecting vessel forms a bypass, through which a part of the process air flow is guided past the heat sink 10.
- This part enters the collecting vessel 18 at the first opening 19 on the upstream side of the heat sink 10 (relative to the process air stream symbolized by thick arrows) and leaves it again after receiving atomised condensate through the second opening 20 which is in relation to the process air flow downstream of the heat sink 10 is arranged.
- a pressure loss over the heat sink 10 in the process air stream is made usable for forming a partial flow which is not cooled in the heat sink 10 and thus can absorb the condensate better than cooled air.
- a fill level sensor 21 Associated with the collection vessel 18 is also a fill level sensor 21. This is used to detect any excess condensate that may be present and to display it to a user in order to enable the user person to take appropriate action, for example to otherwise dispose of the excess condensate.
- the invention is not limited to exhaust air dryer, but in particular also includes those dryers that circulate the process air in any case in part.
- an inventive dryer allows at least partial recovery of heat energy that would otherwise be lost to the drying process, without accumulation of condensate, which would have to be separately and specially disposed of. Therefore, the invention is also attractive from an economical point of view, especially, but not exclusively, in an exhaust air dryer.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007044881A DE102007044881A1 (en) | 2007-09-20 | 2007-09-20 | Washing dryer e.g. condensation dryer, has distributor i.e. ultrasound atomizer, through which condensate separated from process air in heat-exchanger arrangement is distributed in flowing-through process air |
DE102007052075A DE102007052075A1 (en) | 2007-10-31 | 2007-10-31 | Washing dryer e.g. condensation dryer, has distributor i.e. ultrasound atomizer, through which condensate separated from process air in heat-exchanger arrangement is distributed in flowing-through process air |
PCT/EP2008/061859 WO2009040237A1 (en) | 2007-09-20 | 2008-09-08 | Laundry dryer having a distributor for condensate, and a method of operating the same |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2203586A1 true EP2203586A1 (en) | 2010-07-07 |
EP2203586B1 EP2203586B1 (en) | 2013-02-20 |
Family
ID=40090697
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08803827A Not-in-force EP2203586B1 (en) | 2007-09-20 | 2008-09-08 | Laundry dryer having a distributor for condensate, and a method of operating the same |
Country Status (3)
Country | Link |
---|---|
US (1) | US8578626B2 (en) |
EP (1) | EP2203586B1 (en) |
WO (1) | WO2009040237A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110318235A (en) * | 2018-03-30 | 2019-10-11 | 青岛海尔洗衣机有限公司 | A kind of dryer |
Families Citing this family (7)
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---|---|---|---|---|
US8024871B2 (en) * | 2006-11-08 | 2011-09-27 | Lg Electronics Inc. | Exhaust structure for clothes dryer in apartment building |
DE102007018787A1 (en) * | 2007-04-20 | 2008-10-23 | BSH Bosch und Siemens Hausgeräte GmbH | Method for operating a condensation dryer with a heat pump, and suitable condensation dryer for this purpose |
US9382658B2 (en) * | 2012-12-18 | 2016-07-05 | Mohamed H. Tarifi | Lint trap |
CN104631069A (en) * | 2013-11-07 | 2015-05-20 | 杭州三花研究院有限公司 | Clothes dryer and control method thereof |
CN104911882B (en) * | 2014-03-14 | 2018-10-30 | 青岛海尔滚筒洗衣机有限公司 | A kind of dryer or washing-drying integral machine |
KR102366400B1 (en) * | 2015-03-30 | 2022-02-22 | 엘지전자 주식회사 | Laundry treatment apparatus |
EP3075898B1 (en) * | 2015-03-30 | 2018-06-20 | LG Electronics Inc. | Laundry treatment apparatus |
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US3009257A (en) * | 1960-11-09 | 1961-11-21 | Kenneth W Scott | Integrated squeegee-air dryer |
US3899108A (en) * | 1971-11-12 | 1975-08-12 | Normbau Gmbh Maschinen Pappara | Apparatus for steaming and smoothing of articles of clothing in a closed chamber |
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US6691536B2 (en) * | 2000-06-05 | 2004-02-17 | The Procter & Gamble Company | Washing apparatus |
US7059065B2 (en) * | 2002-04-22 | 2006-06-13 | The Procter & Gamble Company | Fabric article treating method and apparatus |
CA2502708C (en) | 2002-11-14 | 2009-04-21 | The Procter & Gamble Company | Fabric article treating device comprising more than one housing |
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CN101300040B (en) * | 2005-09-06 | 2011-04-13 | 智慧医疗技术Pty有限公司 | Nebuliser |
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2008
- 2008-09-08 US US12/677,122 patent/US8578626B2/en not_active Expired - Fee Related
- 2008-09-08 WO PCT/EP2008/061859 patent/WO2009040237A1/en active Application Filing
- 2008-09-08 EP EP08803827A patent/EP2203586B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110318235A (en) * | 2018-03-30 | 2019-10-11 | 青岛海尔洗衣机有限公司 | A kind of dryer |
CN110318235B (en) * | 2018-03-30 | 2023-07-21 | 青岛海尔洗衣机有限公司 | Clothes dryer |
Also Published As
Publication number | Publication date |
---|---|
WO2009040237A1 (en) | 2009-04-02 |
EP2203586B1 (en) | 2013-02-20 |
US8578626B2 (en) | 2013-11-12 |
US20100199515A1 (en) | 2010-08-12 |
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