EP3739110B1 - Appareil de séchage de linge et procédé de fonctionnement d'une pompe à chaleur d'un tel appareil - Google Patents

Appareil de séchage de linge et procédé de fonctionnement d'une pompe à chaleur d'un tel appareil Download PDF

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Publication number
EP3739110B1
EP3739110B1 EP20173145.2A EP20173145A EP3739110B1 EP 3739110 B1 EP3739110 B1 EP 3739110B1 EP 20173145 A EP20173145 A EP 20173145A EP 3739110 B1 EP3739110 B1 EP 3739110B1
Authority
EP
European Patent Office
Prior art keywords
process air
heat pump
refrigerant
drying
air system
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
EP20173145.2A
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German (de)
English (en)
Other versions
EP3739110A1 (fr
Inventor
Alvaro Harbach
Markus Müller
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 Hausgeraete GmbH
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Filing date
Publication date
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Publication of EP3739110A1 publication Critical patent/EP3739110A1/fr
Application granted granted Critical
Publication of EP3739110B1 publication Critical patent/EP3739110B1/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 
    • 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
    • D06F58/48—Control of the energy consumption
    • 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
    • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
    • 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 an appliance for drying laundry, having at least one open process air system with at least one drying chamber accommodating laundry to be dried, at least one heat pump thermally coupled to the process air system and at least one cooling unit thermally coupled to a refrigerant line between a compressor and a condenser of the heat pump Cooling a refrigerant flowing through the refrigerant line.
  • the invention relates to a method for operating a heat pump of an appliance for drying laundry, which has at least one open process air system with at least one drying chamber accommodating laundry to be dried, the heat pump being thermally coupled to the process air system and a compressor of the heat pump flowing out Refrigerant is actively cooled by means of at least one cooling unit, which is thermally coupled to a refrigerant line that carries the refrigerant flowing out of the compressor.
  • Devices for drying laundry are known in many different configurations.
  • devices for drying laundry which allow an open process air system with a drying chamber accommodating laundry to be dried and a recovery of heat from the process air flowing in the process air system.
  • Such a device can be designed, for example, as an exhaust air dryer with heat recovery.
  • Corresponding devices are off, for example DE 197 37 075 A1 , DE 197 31 826 A1 , DE 30 00 865 A1 and U.S. 2012/10030960 A1 known.
  • the unit for heat recovery can be an individual heat exchanger thermally coupled to the process air system or a compressor heat pump thermally coupled to the process air system.
  • EP 2 037 034 B1 also discloses an exhaust air dryer with a heat pump and a cleaning device for cleaning the evaporator of the heat pump.
  • an exhaust air dryer Since an exhaust air dryer has an open process air system, the exhaust air dryer, in contrast to a condensation dryer with a closed process air duct and heat recovery, recovers both latent and sensible heat. In addition, the compressor capacity introduced into the process air via the condenser of the heat pump also increases the drying speed. As a result, an exhaust air dryer with heat recovery can have lower consumption values than a condensation dryer, despite a condensation efficiency of less than 50%.
  • the continuously introduced compressor output leads to increasing heating of the condensation dryer. If this power input is not in balance with the energy losses occurring during a drying process, such as component heating, losses through thermal radiation, convection or leakage, the process air system and the heat pump can overheat, which reduces the efficiency of the heat pump.
  • applications with actively cooled additional heat exchangers in the refrigerant circuit of the heat pump or with air-to-air heat exchangers in the process air are known.
  • the condensing efficiency of exhaust air dryers with a compressor heat pump for heat recovery can be up to 70% depending on the pumping factor and the relative humidity of the inlet air. This efficiency can only be 100% independent of the process air volume flow and the drying speed if the absolute water loading of the process air is the same at the entry and exit point with an otherwise loss-free air flow of the exhaust air dryer.
  • the process air exiting the evaporator of the heat pump leaves the exhaust air dryer with 100% relative humidity, the process air would have to be cooled by 500 W for an assumed process air volume flow of 200 m 3 /h.
  • the assumed process air volume flow of 200 m 3 /h with a specific drying speed of 10 min/kg and an initial moisture content of the laundry of 60%, the difference in the water loading of the process air between the inlet and outlet of the process air system for a degree of condensation of 80% 2 .88 g/kg. This value is independent of the condition of the ambient air.
  • the condensation efficiency would be around 60%.
  • the condensation efficiency would be around 60%.
  • this corresponds to an energy input of 1000 W into the process air.
  • the condensation effect therefore do not exceed 70%.
  • WO 2011/072999 A2 discloses a household appliance with a treatment chamber for treating articles, a process air duct for conducting process air through the treatment chamber, the process air duct comprising a blower for driving the process air, a heating device arranged upstream of the treatment chamber for heating the process air and a heat pump, it being the heating device is a heat source for transferring heat from a refrigerant circulating through the heat pump to the process air.
  • the heat pump comprises a heat sink for transferring heat into the refrigerant, a compressor for compressing the refrigerant, an expansion system for expanding the refrigerant, the expansion system having a variable restriction defined to increase a flow rate of a condensate at given pressure and temperature conditions a refrigerant guide for circulating the refrigerant in a closed loop through the heat pump, a control unit connected to the expansion system, and a sensor unit associated with the heat pump for controlling the restriction of the expansion system in response to signals transmitted from the sensor unit to the control unit.
  • the sensor unit includes an ambient temperature sensor for sensing an ambient temperature of the device, wherein the control unit is preset to set the constraint to a nominal value when the ambient temperature is substantially equal to a given normal ambient temperature, and the control unit is preset to set the constraint to a value that exceeds the nominal value when the ambient temperature differs significantly from the normal ambient temperature.
  • EP 2 599 912 A1 discloses a drying apparatus having a drying chamber and a drying air circuit having an air inlet path connected to one side of the drying chamber, an air outlet path connected to the other side of the drying chamber, and a drying air fan disposed along the air circuit. Furthermore, the drying device has a heat pump system with a heat pump compressor, a first heat exchanger arranged on the air intake path for heating a refrigerant, a second heat exchanger for cooling the refrigerant and heating the drying air, which is arranged downstream of the first heat exchanger, and a third heat exchanger arranged outside of the drying air circuit is provided.
  • the drying device has diverter valves which are arranged between the second heat exchanger on the one hand and the first heat exchanger and the third heat exchanger on the other hand and between the first heat exchanger and the third heat exchanger on the one hand and the compressor on the other hand and which are set up to selectively connect the second heat exchanger either to the first heat exchanger or to the third heat exchanger and optionally to connect the compressor either to the first heat exchanger or to the third heat exchanger.
  • the air inlet path and the air outlet path can either be connected in a closed circuit, to define a condensation dryer in which the second heat exchanger is connected to the first heat exchanger and the latter to the compressor, or be open to the atmosphere outside a housing of the drying device to define a vented dryer in which the second heat exchanger is connected to the third heat exchanger and the latter being connected to the compressor.
  • An object of the invention is to reduce the energy content of process air at an outlet of an open process air system of an appliance for drying laundry and to increase the dehumidification capacity of the appliance.
  • a device for drying laundry has at least one open process air system with at least one drying chamber accommodating laundry to be dried, at least one heat pump thermally coupled to the process air system and at least one cooling unit thermally coupled to a refrigerant line between a compressor and a condenser of the heat pump for cooling a through refrigerant flowing up the refrigerant line, the cooling unit being arranged on the process air system in such a way that it can be at least partially acted upon by process air emerging from the evaporator.
  • the compressed refrigerant flowing out of the compressor and to be fed to the condenser is cooled by means of the additional cooling unit on the refrigerant line of the refrigerant circuit.
  • the cooling unit can have at least one air cooler thermally coupled to the refrigerant line and capable of being subjected to a flow of cooling air, or a liquid cooler thermally coupled to the refrigerant line and capable of being subjected to a flow of cooling liquid, ie a heat exchanger.
  • the Refrigerant line can be routed through the cooler or past it, for example.
  • the additional cooling unit leads to cooling of the refrigerant before it enters the condenser and thus overall to stronger or very strong subcooling of the refrigerant.
  • the possible supercooling of the refrigerant in the condenser remains unaffected.
  • the performance of the condenser which determines the drying speed, falls by the performance output of the cooling unit, the dehumidification performance via the evaporator of the heat pump remains unchanged. This reduces the energy content or the water load of the saturated air at the outlet of the evaporator in relation to the energy input via the condenser to such an extent that the condensation rate increases by the desired amount to over 80%.
  • the drying speed decreases.
  • the additional cooler can transmit more than 600 W. Since the measure according to the invention of increased supercooling of the refrigerant also improves the efficiency of the heat pump, it is even possible to reduce the energy consumption of the appliance for drying laundry. Due to the additional cooling of the refrigerant of the refrigerant circuit of the heat pump according to the invention and the condensing efficiency of more than 80% that can be achieved as a result, the device according to the invention can be operated as a condensation dryer in a closed room despite its open process air circuit.
  • the open process air system is partially formed by the drying chamber accommodating the laundry to be dried and has at least one process air fan for moving process air through process air ducts of the process air system connected in a communicating manner to the drying chamber.
  • the process air system can also have at least one process air filter, which can be connected, for example, between the drying chamber and the evaporator of the heat pump.
  • the process air system can have at least one additional electrical heating unit, which can be connected between the condenser of the heat pump and the drying chamber.
  • the heat pump is preferably directly thermally coupled to the process air system.
  • the evaporator and the condenser are thermally connected to the process air system coupled.
  • the heat pump can be designed as a compressor heat pump and correspondingly have the compressor for compressing the refrigerant and an expansion unit for expanding the refrigerant.
  • the appliance for drying laundry can be designed, for example, as a tumble dryer (air-vented dryer), as a washer-dryer with an air-vented drying function or as a drying cabinet with an air-vented drying function.
  • the cooling unit By arranging the cooling unit on the process air system in such a way that it can be at least partially charged with process air emerging from the evaporator, no additional fan is required, which is associated with advantages in terms of the available installation space within the device and with a reduction in the manufacturing costs of the device.
  • the saturated process air coming from the evaporator is routed through the cooling unit.
  • the cooling unit Depending on the respective energy discharge by means of the cooling unit from the refrigerant circuit, not only is the temperature of the process air raised, but its relative humidity is also lowered.
  • precipitated condensate for example on walls of the process air system blown with the process air, is no longer to be expected.
  • a refrigerant flowing out of a compressor of the heat pump is at least one cooling unit, which is thermally coupled to a refrigerant line carrying the refrigerant flowing out of the compressor, is actively cooled, wherein the cooling unit is acted upon by a process air flow emerging from an evaporator of the heat pump.
  • the advantages mentioned above in relation to the device are correspondingly associated with the method.
  • the method with the device according to one of the above configurations or any combination of at least two of these configurations are carried out together.
  • the cooling unit is actively cooled by applying a flow of cooling fluid to the cooling unit.
  • the cooling unit is subjected to a flow of process air emerging from an evaporator of the heat pump.
  • FIG. 1 shows a schematic representation of an exemplary embodiment of a device 1 according to the invention for drying laundry.
  • the device 1 has a device housing 2 in which an open process air system 3 with a drying chamber 4 (not shown) that accommodates laundry to be dried is arranged.
  • the process air system 3 has a process air fan 5, which can be activated by means of control electronics 6 of the device 1 to carry out a drying process.
  • the device 1 has a heat pump 7 which is thermally coupled to the process air system 3 and is designed as a compressor heat pump.
  • the heat pump 7 has a condenser 8 that heats the ambient air entering the process air system 3, an evaporator 9 that cools and dehumidifies the process air exiting the drying chamber 4, a compressor 10, an expansion unit 11 and refrigerant lines 12 that connect these components of the heat pump 7 to one another, whereby a refrigerant circuit of the heat pump 7 is formed.
  • the device 1 has a cooling unit 13 which is thermally coupled to a refrigerant line 12 between the compressor 10 and the condenser 8 of the heat pump 7 for cooling a refrigerant flowing through this refrigerant line 12 .
  • the cooling unit 13 is arranged on the process air system 3 in such a way that it can be at least partially acted upon by process air emerging from the evaporator 9 .

Landscapes

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

Claims (2)

  1. Appareil (1) de séchage du linge, comprenant au moins un système d'air de traitement (3) ouvert comprenant au moins une chambre de séchage (4) recevant du linge à sécher, au moins une pompe à chaleur (7) couplée thermiquement au système d'air de traitement (3), et au moins une unité de refroidissement (13) couplée thermiquement à une conduite d'agent réfrigérant (12) entre un compresseur (10) et un condenseur (8) de la pompe à chaleur (7) pour refroidir un agent réfrigérant s'écoulant à travers la conduite d'agent réfrigérant (12),
    caractérisé en ce que l'unité de refroidissement (13) est agencée sur le système d'air de traitement (3) de manière à pouvoir être exposée au moins en partie à de l'air de traitement sortant de l'évaporateur (9).
  2. Procédé de fonctionnement d'une pompe à chaleur (7) d'un appareil (1) de séchage du linge, lequel comprend au moins un système d'air de traitement (3) ouvert comprenant au moins une chambre de séchage (4) recevant du linge à sécher, dans lequel la pompe à chaleur (7) est couplée thermiquement au système d'air de traitement (3), et un agent réfrigérant s'écoulant à partir d'un compresseur (10) de la pompe à chaleur (7) est refroidi activement au moyen d'au moins une unité de refroidissement (13), qui est couplée thermiquement à une conduite d'agent réfrigérant (12) acheminant l'agent réfrigérant s'écoulant à partir du compresseur (10),
    caractérisé en ce que l'unité de refroidissement (13) est exposée à un flux d'air de traitement sortant d'un évaporateur (9) de la pompe à chaleur (7).
EP20173145.2A 2019-05-17 2020-05-06 Appareil de séchage de linge et procédé de fonctionnement d'une pompe à chaleur d'un tel appareil Active EP3739110B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019207225.9A DE102019207225A1 (de) 2019-05-17 2019-05-17 Gerät zum Trocknen von Wäsche und Verfahren zum Betreiben einer Wärmepumpe eines solchen Geräts

Publications (2)

Publication Number Publication Date
EP3739110A1 EP3739110A1 (fr) 2020-11-18
EP3739110B1 true EP3739110B1 (fr) 2023-08-02

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Application Number Title Priority Date Filing Date
EP20173145.2A Active EP3739110B1 (fr) 2019-05-17 2020-05-06 Appareil de séchage de linge et procédé de fonctionnement d'une pompe à chaleur d'un tel appareil

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Country Link
EP (1) EP3739110B1 (fr)
CN (1) CN111945401B (fr)
DE (1) DE102019207225A1 (fr)
PL (1) PL3739110T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021202230A1 (de) * 2021-03-09 2022-09-15 BSH Hausgeräte GmbH Kondensationstrockner mit Wärmepumpe und Umluftanteil sowie Verfahren zu seinem Betrieb

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3000865A1 (de) * 1980-01-11 1981-07-16 Fichtel & Sachs Ag, 8720 Schweinfurt Waeschetrockner mit waermerueckgewinnung
DE4409607C2 (de) * 1993-04-21 2002-03-14 Miele & Cie Kondensationswäschetrockner mit einer Wärmepumpe
DE19731826A1 (de) * 1997-07-24 1998-02-12 Joachim Rieder Wäschetrockner mit kontinuierlicher Wärmerückgewinnung
DE19737075A1 (de) * 1997-08-26 1998-03-19 Joachim Rieder Wäschetrockner mit kontinuierlicher Wärmerückgewinnung
JP4026469B2 (ja) * 2002-10-16 2007-12-26 松下電器産業株式会社 衣類乾燥装置
DE10349712B4 (de) * 2003-10-23 2007-03-01 Miele & Cie. Kg Verfahren zum Trocknen von Wäsche und Wäschetrockner zur Durchführung des Verfahrens
JP4531414B2 (ja) * 2004-02-16 2010-08-25 パナソニック株式会社 洗濯乾燥機
DE102007016078A1 (de) * 2007-04-03 2008-10-09 BSH Bosch und Siemens Hausgeräte GmbH Hybridtrockner und Verfahren zum Betreiben eines solchen Hybridtrockners
KR100925739B1 (ko) * 2007-09-13 2009-11-11 엘지전자 주식회사 덕트리스 건조기
EP2058427A1 (fr) * 2007-11-06 2009-05-13 BSH Electrodomésticos España, S.A. Appareil ménager ayant une unité de pompe à chaleur et moyen de refroidissement d'un composant associé
ES2385767B1 (es) * 2009-04-15 2013-06-17 Bsh Electrodomesticos España S.A. Licuador así como también bomba de calor y aparato doméstico con un licuador de tal tipo.
ES2373135B1 (es) * 2009-12-14 2012-12-13 Bsh Electrodomesticos España S.A Aparato doméstico que comprende un sistema de expansión.
DE102009055206A1 (de) * 2009-12-22 2011-06-30 BSH Bosch und Siemens Hausgeräte GmbH, 81739 Hausgerät mit Wärmepumpenkreislauf
CN102822410B (zh) * 2010-08-09 2015-06-17 Lg电子株式会社 干衣机
EP2468946B1 (fr) * 2010-12-27 2014-05-07 Electrolux Home Products Corporation N.V. Système de pompe à chaleur pour sèche-linge et procédé de fonctionnement d'un sèche-linge à pompe à chaleur
EP2489775A1 (fr) * 2011-02-18 2012-08-22 Electrolux Home Products Corporation N.V. Sèche-linge à pompe à chaleur et procédé de fonctionnement d'un sèche-linge à pompe à chaleur
EP2540905B1 (fr) * 2011-06-29 2015-02-25 Electrolux Home Products Corporation N.V. Sèche-linge avec système de pompe à chaleur
EP2599912A1 (fr) * 2011-11-30 2013-06-05 Electrolux Home Products Corporation N.V. Appareil de sèche-linge à pompe thermique
EP3124680B1 (fr) * 2015-07-27 2018-06-20 Electrolux Appliances Aktiebolag Procédé pour adapter des paramètres de fonctionnement lors du séchage dans un séchoir de pompe à chaleur
DE102015216435A1 (de) * 2015-08-27 2017-03-02 BSH Hausgeräte GmbH Haushaltsgerät mit Abreinigungseinrichtung für Wärmetauscher
DE102017217767A1 (de) * 2017-10-06 2019-04-11 BSH Hausgeräte GmbH Wäschebehandlungsgerät und Verfahren zum Betreiben eines Wäschebehandlungsgeräts
DE102018201257A1 (de) * 2018-01-29 2019-08-01 BSH Hausgeräte GmbH Gerät zum Trocknen von Wäsche und Verfahren zum Betreiben einer Wärmepumpe eines solchen Geräts

Also Published As

Publication number Publication date
DE102019207225A1 (de) 2020-11-19
CN111945401A (zh) 2020-11-17
CN111945401B (zh) 2024-04-26
EP3739110A1 (fr) 2020-11-18
PL3739110T3 (pl) 2024-01-03

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