EP3265602B1 - Wäschetrockner vom wärmepumpentyp und verfahren zur steuerung davon - Google Patents

Wäschetrockner vom wärmepumpentyp und verfahren zur steuerung davon Download PDF

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Publication number
EP3265602B1
EP3265602B1 EP15709443.4A EP15709443A EP3265602B1 EP 3265602 B1 EP3265602 B1 EP 3265602B1 EP 15709443 A EP15709443 A EP 15709443A EP 3265602 B1 EP3265602 B1 EP 3265602B1
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EP
European Patent Office
Prior art keywords
air
temperature
cooling
fan
cooling process
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EP15709443.4A
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English (en)
French (fr)
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EP3265602A1 (de
Inventor
Selcuk KARAGOZ
Gokalp KILINC
Erdem Kara
Unsal KOYUNCU
Bahadir BARBAROZ
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Arcelik AS
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Arcelik AS
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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 
    • 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
    • D06F2101/00—User input for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2101/20—Operation modes, e.g. delicate laundry washing programs, service modes or refreshment cycles
    • 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
    • D06F2103/28—Air properties
    • D06F2103/32—Temperature
    • 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
    • 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

Definitions

  • the present invention relates to a heat pump type laundry dryer and a method for controlling the heat-pump type laundry dryer.
  • Several techniques have been devised for drying the wet laundry.
  • the ventless laundry dryers such as the heat-pump type laundry dryers and the condenser type laundry dryers are commonly known.
  • the clothes are generally dried by conveying dehumidified heated process air through the rotating laundry drum.
  • the heat pump technology constitutes an energy-efficient method of drying the laundry.
  • a heat pump type laundry dryer generally comprises a process air circuit and a refrigerant circuit which are arranged so as to mutually exchange heat.
  • the process air circuit comprises a duct for circulating the process air through the laundry drum by means of a fan inside the duct.
  • the refrigerant circuit includes an evaporator, a compressor, a condenser and an expansion valve or a capillary tube in serial connection for circulating the refrigerant.
  • the evaporator and the condenser are arranged in heat-exchange with the process air inside the duct for dehumidifying and heating the process air.
  • the heat absorbed by the evaporator is partly transferred back to the process air by means of the condenser. Thereby, the drying performance of the laundry dryer can be improved.
  • European Patent Application EP 2 811 064 A1 discloses the operation of a heat pump dryer by selecting in dependency on a detected temperature signal a temperature threshold value for switching the compressor ON and/or OFF.
  • European Patent Application EP 2 690 212 A1 discloses a laundry drying machine in which an auxiliary condenser is cooled by a fan that is controlled according to signals from two temperature sensors.
  • European Patent Application EP 2 679 718 A1 discloses a laundry treating machine comprising a thermo protector circuit adapted to cut the power supply to the compressor when predetermined temperature thresholds are exceeded.
  • WO 2014/173149 A1 discloses a heat pump laundry dryer wherein a cooling fan is operated to cool the compressor between two threshold temperatures, which are respectively sensed by a sensor.
  • a problem with the drying process is that when the laundry is completely dried the risk that the laundry suddenly catches fire increases. Therefore, according to the IEC standards the temperature of the laundry must be reduced after termination of the drying process in order to reduce the fire risk. In particular, it is prescribed that the process air temperature must be reduced below 55°C in a cooling process which is to be commenced after termination of the drying process.
  • the process air circuit and the refrigeration circuit in particular the process air fan inside the duct and the compressor motor must continue to run during such cooling process.
  • the duration of the cooling process may vary from case to case and cannot be precisely predicted. Therefore, the displayed estimated operation time generally differs from the actual operation time. Thereby, the consumer satisfaction may easily decrease.
  • An objective of the present invention is to provide a heat pump type laundry dryer and a method for controlling the heat pump laundry dryer which overcomes the aforementioned drawbacks of the prior art in a cost effective way and which enables an energy-efficient and safe operation.
  • the heat pump type laundry dryer of the present invention comprises a fan for cooling the compressor and a sensor for sensing the process air temperature T_air, wherein the control unit is configured to set a first threshold temperature T_th1 which is equal to or smaller than 55°C, to set a second threshold temperature T_th2 which is less than T_th1 and to initiate, prior to the termination of the drying process a cooling process in which the compressor cooling fan is turned ON when T_air reaches T_th1 and the compressor cooling fan is turned OFF when T_air drops to T_th2.
  • the temperature of the laundry can be reduced below 55°C prior to the termination of the drying process. Thereby, the need for conducting an additional cooling process after the termination of the drying process can be obviated.
  • the total operation time of the laundry dryer can be prevented from prolonging. Thereby the energy consumption can be reduced and the energy efficiency can be improved.
  • the risk of fire can be eliminated or reduced as much as possible and thus the safety can be improved. Thereby, the consumer satisfaction can be increased.
  • the cooling process is initiated when the user selects a predetermined drying program or after elapse of a predetermined duration whichever condition enters first.
  • an auxiliary cooling process is initiated prior to the initiation of the cooling process, or after the initiation of the cooling process when T_air has not yet reached T_th1.
  • the compressor cooling fan is turned ON or OFF and/or the compressor motor is turned ON or OFF or driven at higher or lower rotational speeds in accordance with the refrigerant temperature T_rfg so as to maintain the latter within the limits of an upper threshold and a lower threshold.
  • the measures taken in the auxiliary cooling process in respect of the compressor motor can also be similarly applied in the cooling process.
  • the process air temperature T_air is sensed in the vicinity of an air filter of the process air circuit which is located on the downstream of the drum.
  • the heat-pump type laundry dryer (1) comprises a rotating drum (2) for receiving the laundry, a process air circuit (3) for conveying dehumidified heated process air through the drum (2), wherein the process air circuit (3) includes a duct (10) and a process air fan (11) inside the duct (10), a refrigerant circuit (4) for dehumidifying the process air and heating the dehumidified process air, wherein the refrigerant circuit (4) includes a refrigerant compressor (5), a condenser (12), an expansion element (13) such as a capillary tube or an expansion valve and an evaporator (14) and a control unit (6) for conducting the drying process of the laundry.
  • the heat-pump type laundry dryer (1) of the present invention further comprises: a fan (7) for cooling the compressor (5) and a sensor (8) for sensing the process air temperature T_air, wherein the control unit (6) is configured to set a first threshold temperature T_th1 which is equal to or smaller than 55°C, to set a second threshold temperature T_th2 which is less than T_th1 and to initiate, prior to the termination of the drying process a cooling process in which the fan (7) is turned ON when T_air reaches T_th1 and the fan (7) is turned OFF when T_air drops to T_th2 ( Fig. 1 to 3 ).
  • control unit (6) is further configured to initiate the cooling process when a predetermined drying program has been selected by the user via a user interface (not shown) or a predetermined duration has elapsed since the drying process was commenced.
  • said drying program is a program which is specific for drying cotton laundry to a level of dryness that is suitable for ironing.
  • said predetermined duration is shorter than the total operation time of the drying program.
  • the heat-pump type laundry dryer (1) further comprises a sensor (9) for sensing the refrigerant temperature T_rfg.
  • the control unit (6) is further configured to set a third threshold temperature T_th3, to set a fourth threshold temperature T_th4 which is equal to smaller than T_th3 and to initiate an auxiliary cooling process (A) prior to the initiation of the cooling process or after the initiation of the cooling process when T_air has not yet reached T_th1, wherein in the auxiliary cooling process (A) the fan (7) is turned ON when T_rfg exceeds T_th3 and the fan (7) is turned OFF when T_rfg drops below T_th4.
  • the process air circuit (3) comprises an air filter (not shown) which is located immediately downstream of the drum (2).
  • the sensor (8) for sensing the process air temperature T_air is located in the vicinity of the air filter.
  • the method for controlling the heat-pump type laundry dryer (1) comprises: a step (S1) of starting the drying process in which the laundry is dried by process air.
  • the control method the present invention further comprises: a step (S2) of setting a first threshold temperature T_th1 which is equal to or smaller than 55°C and a second threshold temperature T_th2 which is less than T_th1; a step (S2) of initiating a cooling process prior to the termination of the drying process, wherein the cooling process comprises: a step (S3 to S6) of sensing the process air temperature T_air, turning the compressor cooling fan (7) ON when the process air temperature T_air reaches T_th1 and turning the compressor cooling fan (7) OFF when the process air temperature T_air drops to T_th2.
  • the cooling process is initiated when a predetermined drying program has been selected by the user or a predetermined duration has elapsed since the drying process was commenced.
  • control method further comprises a step of initiating (S2-S3) an auxiliary cooling process (A) prior to the initiation of the cooling process, or after the initiation of the cooling process when T_air has not yet reached T_th1, wherein the auxiliary cooling process (A) comprises: a step (S7, S9) of setting a third threshold temperature T_th3 and a fourth threshold temperature T_th4 which is equal to or smaller than T_th3 and a step (S7 to S10) of sensing the refrigerant temperature T_rfg, turning the compressor cooling fan (7) ON when the refrigerant temperature T_rfg exceeds T_th3 and turning the compressor cooling fan (7) OFF when the refrigerant temperature T_rfg drops below T_th4 ( Fig. 1 to 3 ).

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Claims (5)

  1. Ein wärmepumpentyp Wäschetrockner (1) besitzt:
    - eine Trommel (2) für die Aufnahme von der Wäsche,
    - einen Prozessluftumlauf (3), dass die entfeuchtete und erhitzte Prozessluft durch die Trommel (2) befördert,
    - einen Kältemittelumlauf (4) für das Entfeuchten der Prozessluft und zum Erwärmen der entfeuchteten Prozessluft, wobei der Kältemittelumlauf (4) einen Kältemittelkompressor (5) besitzt,
    - eine Steuereinheit (6) für die Durchführung des Trocknungsvorgangs
    - einen Ventilator (7) zum Kühlen des Kältemittelkompressors (5)
    - einen Sensor (8) zum Erfassen der Prozesslufttemperatur T_air,
    gekennzeichnet durch
    - die Steuereinheit (6), die so konfiguriert ist, dass es um eine erste Schwellentemperatur T_th1 einzustellen ist, die gleich oder kleiner als 55°C ist,
    - eine zweite Schwellentemperatur T_th2, die kleiner als T_th1 ist,
    - dass vor der Beendigung des Trocknungsprozesses ein Kühlvorgang einzuleiten ist, bei dem der Ventilator (7) eingeschaltet wird, wenn T_air T_th1 erreicht und der Ventilator (7) ausgeschaltet wird, wenn T_air auf T_th2 absinkt,
    - dass Starten des Kühlvorgangs, wenn ein vorbestimmtes Trocknungsprogramm vom Benutzer ausgewählt wurde oder eine vorbestimmte Zeit seit dem Beginn des Trocknungsvorgangs vergangen ist.
  2. Ein wärmepumpentyp Wäschetrockner (1), wie in Anspruch 1 aufgeführt, ist dadurch gekennzeichnet, dass ein Sensor (9) für das Erfassen der Kältemitteltemperatur T_rfg vorgesehen ist, allerdings die Steuereinheit (6) dazu eingerichtet ist, eine weitere (dritte) Schwellentemperatur T-th3 und (vierte) Schwellentemperatur T-th4 einzustellen, die gleich oder kleiner als T_th3 ist und für das Einleiten eines Hilfskühlvorgangs (A) dient, dass vor oder nach dem Beginn des Abkühlvorgangs, falls T_air noch nicht T_th1 erreicht haben sollte, wobei in Hilfskühlvorgang (A) der Ventilator (7) eingeschaltet wird, wenn T_rfg T_th3 überschreitet und der Ventilator (7) wird ausgeschaltet wird, wenn T_rfg T_th4 unterschreitet.
  3. Ein wärmepumpentyp Wäschetrockner (1), wie in den Ansprüchen 1 bis 2 aufgeführt, ist dadurch gekennzeichnet, dass der Prozessluftumlauf (3) einen Luftfilterbesitzt, der unmittelbar stromabwärts an der Trommel (2) angeordnet ist, wobei der Sensor (8) sich zum Erfassen der Prozesslufttemperatur T_air in der Nähe des Luftfilters befindet.
  4. Ein Verfahren für das Steuern des wärmepumpentyp Wäschetrockner (1) umfasst:
    - einen Schritt (S1) zum Starten des Trocknungsverfahren, bei dem die Wäsche durch Prozessluft getrocknet wird.
    Dieses Verfahren ist weiterhin gekennzeichnet durch:
    - einen Schritt (S2) für das Einstellen einer ersten Schwellentemperatur T_th1, die gleich oder kleiner als 55 °C ist und einer zweiten Schwellentemperatur T_th2, die kleiner als T_th1 ist;
    - einen Schritt (S2) zum Einleiten eines Kühlprozesses vor der Beendigung des Trocknungsprozesses, wobei dieser Kühlprozess folgendes umfasst:
    - einen Schritt (S3 bis S6) zum Erfassen der Prozesslufttemperatur T_air, durch das Einschalten eines Kompressorkühlventilators (7), wenn die Prozesslufttemperatur T_air T_th1 erreicht und schaltet dass Kompressorkühlventilator (7) ein, wenn die Prozesslufttemperatur T_air absinkt zu T_th2,
    - wobei in dem Verfahrensschritt (S2) der Kühlprozess dann eingeleitet wird, wenn ein vorbestimmtes Trocknungsprogramm vom Benutzer ausgewählt wurde oder eine vorbestimmte Dauer seit dem Beginn des Trocknungsprozesses vergangen ist.
  5. Das Verfahren zum Steuern des Trockners, wie in Anspruch 4 aufgeführt, umfasst fortfahrend:
    - einen Schritt zum Einleiten (S2-S3) des Hilfskühlvorgangs (A) vor oder nach dem Beginn des Abkühlvorgangs, wenn T_air noch nicht T_th1 erreicht hat, wobei der Hilfskühlvorgang (A) folgendes einschließt:
    - einen Schritt (S7, S9) zum Einstellen einer dritten Schwellentemperatur T_th3 und vierten Schwellentemperatur T_th4, die gleich oder kleiner als T_th3 ist und einen Schritt (S7 bis S10) für das Erfassen der Kältemitteltemperatur T_rfg, wobei der Kompressorkühlventilator (7) auf EiN (ON) gedreht wird, wenn die Kältemitteltemperatur T_rfg T_th3 überschreitet und ausgeschaltet wird, wenn durch das Kompressorkühlventilator (7) die Kältemitteltemperatur T_rfg T_th4 unterschreitet.
EP15709443.4A 2015-03-02 2015-03-02 Wäschetrockner vom wärmepumpentyp und verfahren zur steuerung davon Active EP3265602B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2015/054260 WO2016138920A1 (en) 2015-03-02 2015-03-02 Heat pump type laundry dryer and method for controlling the same

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EP3265602A1 EP3265602A1 (de) 2018-01-10
EP3265602B1 true EP3265602B1 (de) 2019-05-08

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US (1) US20180038042A1 (de)
EP (1) EP3265602B1 (de)
TR (1) TR201602419A1 (de)
WO (1) WO2016138920A1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10260194B2 (en) * 2016-07-15 2019-04-16 Whirlpool Corporation Laundry treating appliance with a sensor
KR102658780B1 (ko) * 2016-09-21 2024-04-19 엘지전자 주식회사 건조기의 제어 방법

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014173149A1 (zh) * 2013-04-24 2014-10-30 海尔集团公司 一种干衣机控制方法

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Publication number Priority date Publication date Assignee Title
DE10360867A1 (de) * 2003-12-23 2005-07-21 BSH Bosch und Siemens Hausgeräte GmbH Verfahren und Vorrichtung zum Trocknen von Wäsche
US8991068B2 (en) * 2011-06-16 2015-03-31 General Electric Company Energy efficient cycle for clothes dryer
US9285166B2 (en) * 2011-10-04 2016-03-15 Arcelik Anonim Sirketi Heat pump laundry dryer
EP2679718A1 (de) * 2012-06-29 2014-01-01 Electrolux Home Products Corporation N.V. Wäsche- oder Geschirrbehandlungsmaschine
PL2690212T3 (pl) * 2012-07-23 2017-04-28 Whirlpool Corporation Sposób sterowania suszarką do pranej bielizny z systemem pompy ciepła i suszarka do pranej bielizny sterowana takim sposobem
EP2733256A1 (de) * 2012-11-16 2014-05-21 Electrolux Home Products Corporation N.V. Wäschebehandlungsvorrichtung mit Wärmepumpe und Verfahren für den Betrieb einer Wäschebehandlungsvorrichtung mit Wärmepumpe
EP2811064B1 (de) * 2013-06-03 2020-10-14 Electrolux Appliances Aktiebolag Wäschebehandlungsvorrichtung mit temperaturabhängiger Steuerung

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
WO2014173149A1 (zh) * 2013-04-24 2014-10-30 海尔集团公司 一种干衣机控制方法

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WO2016138920A1 (en) 2016-09-09
EP3265602A1 (de) 2018-01-10
TR201602419A1 (tr) 2018-03-21
US20180038042A1 (en) 2018-02-08

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