EP2140062B1 - Verfahren zum betrieb eines kondensationstrockners mit einer wärmepumpe, sowie hierzu geeigneter kondensationstrockner - Google Patents

Verfahren zum betrieb eines kondensationstrockners mit einer wärmepumpe, sowie hierzu geeigneter kondensationstrockner Download PDF

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Publication number
EP2140062B1
EP2140062B1 EP08736248A EP08736248A EP2140062B1 EP 2140062 B1 EP2140062 B1 EP 2140062B1 EP 08736248 A EP08736248 A EP 08736248A EP 08736248 A EP08736248 A EP 08736248A EP 2140062 B1 EP2140062 B1 EP 2140062B1
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EP
European Patent Office
Prior art keywords
air
heat pump
dried
dryer
process air
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.)
Active
Application number
EP08736248A
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German (de)
English (en)
French (fr)
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EP2140062A2 (de
Inventor
Günter Steffens
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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Publication of EP2140062A2 publication Critical patent/EP2140062A2/de
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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
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • D06F2103/10—Humidity expressed as capacitance or resistance
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/50—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to heat pumps, e.g. pressure or flow rate
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/26—Heat pumps
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/28—Electric heating
    • 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
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/45—Cleaning or disinfection of machine parts, e.g. of heat exchangers or filters

Definitions

  • the invention relates to a method for operating a condensation dryer with a drying chamber for the objects to be dried, a process air circuit in which there is a heater for heating the process air and the heated process air is guided by means of a blower over the objects to be dried, a heat pump cycle with a Evaporator, a compressor and a condenser, and sensors for determining the humidity of the objects to be dried, as well as a suitable condensation dryer (see, for example, the document DE-A-3 113 471 ).
  • the method is suitable for disinfecting the articles, which are in particular laundry items.
  • Clothes dryers whose operation is based on the condensation of the evaporated by means of warm process air moisture of the laundry from the process air discharged from the laundry - so-called condensation dryer - need no exhaust hose and are very popular because it uses in an internal bathroom or a laundry room of a larger residential complex can be. This applies both to specially designed for drying laundry clothes dryer as well as for so-called washer-dryer, so devices that both wash clothes and can dry. Any subsequent reference to a "tumble dryer” or “condenser dryer” therefore applies to both a drying and a washing and drying device.
  • process air In a condensation dryer air (so-called 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, for example, by a separately guided cooling air flow, so that the moisture contained in the moist process air condenses.
  • the water thus accumulated is then generally collected in a suitable container, and the cooled and dried air is returned to the heater and then to the drum.
  • This drying process is very energy-intensive, since the heat extracted during the cooling of the process air in the heat exchanger is lost to the process, at least when this heat is dissipated in a cooling air flow.
  • a heat pump is the well-known "compressor heat pump", in which circulates a cyclically to be evaporated and liquefied working or refrigerant and which is widely used for cooling or air conditioning, are used.
  • compressor heat pump In a condensation dryer equipped with such a heat pump, the cooling of the warm, moisture-laden process air essentially takes place in a first heat exchanger of the heat pump, in particular an evaporator, where the heat transferred is used to evaporate a refrigerant used in the heat pump.
  • Such vaporized due to the heating refrigerant is fed via a compressor to a second heat exchanger, in the given case and hereinafter also called “condenser", the heat pump, where due to the condensation of the gaseous refrigerant heat is released, which in turn for heating the process air before entering the Drum is used.
  • the liquefied refrigerant passes through a throttle, which reduces its pressure, back to the evaporator to evaporate there, with renewed absorption of heat from the process air.
  • a condensation dryer with a compressor heat pump occurs due to the process in the drying chamber a temperature of only 50 ° C to 60 ° C, which is generally insufficient for a disinfection of laundry.
  • the disinfecting in the condenser dryer in particular the disinfection of laundry, but would in principle be easily possible if the drying chamber and thus the laundry contained in it would be kept for a sufficiently long period of time at a temperature of about 70 ° C.
  • the object of the invention is therefore to provide a method for operating a condensation dryer of the type specified above, in particular a condensation dryer with a heat pump, with which a disinfection at elevated temperature can be performed. Also, a particularly suitable for this process condensation dryer should be specified.
  • An object of the invention is thus a method for operating a condensation dryer with a drying chamber for the objects to be dried, a process air circuit in which there is a heater for heating the process air and heated process air is guided by means of a blower over the objects to be dried, and a Heat pump circuit comprising an evaporator, a compressor and a condenser, and a sensor arrangement for determining a moisture in the objects to be dried, wherein the humidity is determined and up to a predetermined value (F) of the humidity in the range of 0% to 12%, preferably 3% to 5%, the process air through the condenser (15), preferably exclusively by this, is heated and after falling below the predetermined value (F) the heater (18) is operated in such a way that over a period of at least 5 minutes , preferably at most 40 minutes, more preferably over a period dream of 10 to 15 minutes, in the drying chamber an air temperature of at least 70 ° C is.
  • F predetermined value
  • the heat pump circuit is switched off before reaching an air temperature of 65 ° C.
  • the heat pump cycle is switched off when switching on the heater.
  • an air-air heat exchanger optionally present in the condensation dryer is switched on. This also allows for a switched-off heat pump cycle (ie deactivated evaporator) a condensation of still in the objects to be dried, especially laundry, existing moisture.
  • the heater is operated so that in the drying chamber, an air temperature in the range of 70 to 80 ° C consists.
  • the invention also relates to a condensation dryer for carrying out the method according to the invention with a drying chamber for the objects to be dried, a process air circuit in which there is a heater for heating the process air and heated process air by means of a blower over the objects to be dried, a heat pump cycle with an evaporator, a compressor and a condenser, and a sensor arrangement for determining the moisture in the objects to be dried, the condensation dryer having a control unit for switching on the heating when a predetermined value (F) of the humidity in the range of 0 to 12% is reached. , Preferably 3 to 5%, and is equipped to shut down a heat pump cycle.
  • F predetermined value
  • the condensation dryer according to the invention is equipped with a sensor arrangement comprising at least one sensor for determining the moisture in the objects to be dried.
  • the sensor assembly is generally located in the drying chamber.
  • two electrodes can be introduced into the drying chamber, usually a laundry drum, in such a way that they contact the wet items of laundry.
  • An electrical voltage is applied to the electrodes and the current intensity or the electrical conductance between the electrodes is measured. If the measured current value or the measured electrical conductance falls below a predetermined threshold value, which corresponds to a predetermined humidity (F), this can be concluded by reaching the end of a normal drying phase, to which the generally to a disinfection of the dry material (laundry) leading inventive method connects.
  • F predetermined humidity
  • the switching on of the heater and switching off the heat pump cycle is effected.
  • the disinfection of the dry material can be carried out via a separate program or as an integrated module at the end of a drying program.
  • the condensation dryer according to the invention has an air-to-air heat exchanger, and a control unit, upon reaching a predetermined value (F) of the humidity in the range of 0 to 12% causes the switching of the air-to-air heat exchanger.
  • the air-air heat exchanger can be removed. This is particularly advantageous because a removable heat exchanger can be easily cleaned of lint.
  • the refrigerant used in the heat pump cycle is preferably selected from the group consisting of a butane / isopropane mixture, carbon dioxide and fluorocarbon compounds. As such, these agents are known as refrigerants.
  • the heat pump in the condensation dryer according to the invention has, in addition to evaporator, condenser and compressor in the flow direction of the refrigerant between the condenser and the evaporator, an expansion valve (also referred to as throttle valve or throttle) on.
  • an expansion valve also referred to as throttle valve or throttle
  • the refrigerant used in the heat pump preferably circulates in the heat pump circuit with a turbulent flow.
  • a turbulent flow may be adjusted by a suitable structural design of a flow channel and / or by suitable drive means (e.g., compressor).
  • the temperature of the refrigerant of the heat pump, in particular in the condenser, according to the invention is generally kept within the permissible range via the control of heat pump, heating and air-air heat exchanger.
  • process air and cooling air or process air and refrigerant in the heat pump are each passed through the corresponding heat exchangers in a crossflow or countercurrent process.
  • the heater used in the condensation dryer according to the invention is preferably a two-stage heater.
  • the heating power of the heater is preferably in the range of 1000 to 2500 watts. especially between 1300 and 2000 watts.
  • the condenser dryer As the degree of drying of the objects to be dried in the condenser dryer decreases the energy required for drying, it is appropriate to regulate the heating accordingly, that is. As the degree of dryness progresses, their heating power is reduced to maintain a balance between the supplied and necessary drying energy.
  • the invention has the advantage that an energetically favorable drying process is connected with the disinfection of the objects to be dried or dried. Moreover, the disinfection can be achieved in a particularly gentle way. In addition, the heat pump is spared.
  • FIG. 1 It is referred to FIG. 1 ,
  • FIG. 1 shows a vertically cut condensation dryer (hereinafter abbreviated to "dryer”) according to an embodiment of the invention with a heat pump circuit, a heater and an air-to-air heat exchanger.
  • dryer vertically cut condensation dryer
  • the in FIG. 1 shown dryer 1 has a drum rotatable about a horizontal axis as a drying chamber 3, are mounted within which driver 4 for moving laundry during a drum rotation.
  • Process air is conducted by means of a blower 19 via a heater 18, by a drum 3, an air-air heat exchanger 11, 12 and a heat pump 13, 14, 15 in an air channel 2 in a closed circuit (process air circuit 2).
  • the moist, warm process air is cooled and reheated after condensation of moisture contained in the process air.
  • heated air from the heater 18, ie from the side of the drum 3 opposite a dryer door 5 is passed through the perforated bottom into the drum 3, where it comes into contact with the laundry to be dried and flows through the filling opening of the drum 3 to a lint filter 6 within a drying door closing the filling opening 5.
  • the air flow is deflected in the dryer door 5 down and passed from the air duct 2 to the air-air heat exchanger 11, 12.
  • the moisture absorbed by the process air from the items of laundry condenses there and is absorbed in a FIG. 1 dashed drawn condensate tank 21 collected from which they can be disposed of.
  • the somewhat cooled process air to the evaporator 13 of a heat pump 13, 14, 15 out, where it is further cooled.
  • the refrigerant of the heat pump evaporated in the evaporator 13 is conducted to the condenser 15 via a compressor 14.
  • the refrigerant liquefies with heat being released to the process air.
  • the now in liquid form refrigerant is then via a throttle valve 17 again led to the evaporator 13, whereby the refrigerant circuit is closed.
  • the cooling air is taken from the room air and, after passing through the air-to-air heat exchanger 11, 12 again supplied to the room air.
  • 20 means a fan in the cooling air passage 12 of the air-to-air heat exchanger.
  • Sensors 22 and 23 are used to determine the moisture in the objects to be dried, in particular laundry.
  • the signals of the sensors are supplied to a control device 16, which in turn is connected via lines 10 to the heater 18, the heat pump circuit 13, 14, 15 and the air-air cooler 11, 12.
  • the control device 16 causes in response to a predetermined humidity (F) and the humidity measured by the sensors 22 and 23, a connection of the heater 18, a shutdown of the heat pump circuit 13, 14, 15 and a connection of the air-air cooler 11,12 ,
  • 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 7, wherein the drum 3 rests with a brim on a sliding strip 8 on the bearing plate 7 and is held at the front end.
  • the control of the condensation dryer can be controlled by the user via an operating unit 9.
  • a drying process with disinfection is commonly carried out on appropriate selection of the control unit 9.
  • the presence of the conventional heater 18 in addition to the heat pump 13, 14, 15 is utilized.
  • the laundry items loaded in the drum 3 for drying are conventionally dried using the heat pump 13, 14, 15 in an energy-saving manner.
  • the heat pump 13, 14, 15 can not be used because they can not work at the high temperatures of the process air, which are required for disinfecting, or only poorly. Consequently, it is turned off, and only the conventional heater 18 is used. Since the laundry items are already largely dried, their heat absorption capacity is relatively low, and the thermal performance of the heater 18 is sufficient to achieve the necessary high temperatures.
  • the air-air cooler 11, 12 are deactivated to keep losses of heat low. Then the disinfection takes place by appropriate heating of the laundry items. For a subsequent rapid cooling of the laundry items may optionally be the air-to-air cooler 11, 12 are used.
  • the invention provides a new, useful and useful application option for a dryer of the hybrid genus.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Drying Of Solid Materials (AREA)
EP08736248A 2007-04-20 2008-04-15 Verfahren zum betrieb eines kondensationstrockners mit einer wärmepumpe, sowie hierzu geeigneter kondensationstrockner Active EP2140062B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007018787A DE102007018787A1 (de) 2007-04-20 2007-04-20 Verfahren zum Betrieb eines Kondensationstrockners mit einer Wärmepumpe, sowie hierzu geeigneter Kondensationstrockner
PCT/EP2008/054563 WO2008128931A2 (de) 2007-04-20 2008-04-15 Verfahren zum betrieb eines kondensationstrockners mit einer wärmepumpe, sowie hierzu geeigneter kondensationstrockner

Publications (2)

Publication Number Publication Date
EP2140062A2 EP2140062A2 (de) 2010-01-06
EP2140062B1 true EP2140062B1 (de) 2012-06-20

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Country Status (5)

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US (1) US8087182B2 (zh)
EP (1) EP2140062B1 (zh)
CN (1) CN101663433B (zh)
DE (1) DE102007018787A1 (zh)
WO (1) WO2008128931A2 (zh)

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US8640360B2 (en) * 2010-01-08 2014-02-04 Karcher North America, Inc. Integrated water damage restoration system, sensors therefor, and method of using same

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WO2008128931A2 (de) 2008-10-30
US20100037480A1 (en) 2010-02-18
DE102007018787A1 (de) 2008-10-23
CN101663433B (zh) 2011-08-10
WO2008128931A3 (de) 2009-01-08
CN101663433A (zh) 2010-03-03
EP2140062A2 (de) 2010-01-06
US8087182B2 (en) 2012-01-03

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