EP2692940A1 - Procédé de séchage du linge dans un sèche-linge et sèche-linge - Google Patents

Procédé de séchage du linge dans un sèche-linge et sèche-linge Download PDF

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Publication number
EP2692940A1
EP2692940A1 EP12178467.2A EP12178467A EP2692940A1 EP 2692940 A1 EP2692940 A1 EP 2692940A1 EP 12178467 A EP12178467 A EP 12178467A EP 2692940 A1 EP2692940 A1 EP 2692940A1
Authority
EP
European Patent Office
Prior art keywords
air
laundry
machine
circuit
air stream
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.)
Withdrawn
Application number
EP12178467.2A
Other languages
German (de)
English (en)
Inventor
Francesco Cavarretta
Massimiliano Vignocchi
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.)
Electrolux Home Products Corp NV
Original Assignee
Electrolux Home Products Corp NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Electrolux Home Products Corp NV filed Critical Electrolux Home Products Corp NV
Priority to EP12178467.2A priority Critical patent/EP2692940A1/fr
Publication of EP2692940A1 publication Critical patent/EP2692940A1/fr
Withdrawn legal-status Critical Current

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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
    • D06F58/20—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
    • 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 
    • D06F58/26—Heating arrangements, e.g. gas heating equipment

Definitions

  • the present invention concerns the technical field of laundry treating machines, especially laundry drying machines.
  • the present invention refers to a method for drying laundry in laundry drying machines of the condenser type and such laundry drying machines.
  • Laundry treating machines capable of carrying out a drying process on laundry generally comprise a casing that houses a laundry container, like a rotating drum, where laundry to be treated is received and a closed air stream circuit for carrying out drying operation by circulating hot air through the laundry container containing the wet laundry.
  • a heating device for heating up the air stream is advantageously arranged upstream of the rotating drum.
  • An air circulating device typically a fan, is provided in the air stream circuit for circulating the hot hair.
  • dryers further comprise condensing means provided in the air stream circuit for removing moisture from warm humid air that leaves the drum.
  • the warm humid air is both cooled down and dehumidified by the condensing means.
  • the heating device and the condensing means are, respectively, the condenser and the evaporator of a heat pump system.
  • a compressor connects the evaporator outlet to the condenser inlet while expansion means, for example an expansion valve, connects the condenser outlet to the evaporator inlet.
  • the heating device and the condensing means comprises, respectively, an electrical heater which heats up the air stream and a heat exchanger (typically an air-ait heat exchanger) which dehumidifies the humid air.
  • a heat exchanger typically an air-ait heat exchanger
  • Another object of the present invention is to provide a laundry drying machine which has reduced dimensions compared to the systems of known type.
  • a laundry drying machine comprising a laundry chamber suitable for receiving the laundry to be dried, an air stream circuit for circulating an air stream through said laundry chamber, wherein the stream circuit comprises a dehumidifying unit for dehumidifying the moist air of said air stream coming from said laundry chamber and a heating unit for heating up the dehumidified air leaving said dehumidifying unit and conveyable into said laundry chamber and by providing an auxiliary heat transferring circuit suitable for transferring heat from said air stream coming from said laundry to said dehumidified air leaving said dehumidifying unit it is possible to obtain a laundry drying machine having a higher energy efficiency compared to the known technique.
  • the present invention relates, therefore, to a laundry drying machine comprising a laundry chamber suitable for receiving the laundry to be dried, an air stream circuit for circulating an air stream through said laundry chamber, said air stream circuit comprising:
  • the heat transferring circuit comprises a closed loop circuit.
  • the heat transferring circuit comprises a first auxiliary heat exchanger suitable for transferring heat from the first air circulation path to the closed loop circuit.
  • the first auxiliary heat exchanger comprises an air-fluid exchanger.
  • the heat transferring circuit comprises a second auxiliary heat exchanger suitable for transferring heat from the closed loop circuit to the second air circulation path.
  • the second auxiliary heat exchanger comprises a fluid-air exchanger.
  • the closed loop circuit comprises a secondary fluid flowing therein.
  • the secondary fluid comprises a liquid or a gas, preferably comprises water.
  • the closed loop circuit comprises a fluid circulating device for circulating the secondary fluid inside the closed loop circuit.
  • the fluid circulating device comprises a pump.
  • the dehumidifying unit comprises a first heat exchanger of a heat pump system.
  • the first heat exchanger is an evaporator or a gas heater.
  • the heating unit comprises a second heat exchanger of a heat pump system.
  • the second heat exchanger is a condenser or a gas cooler.
  • the heat pump system further comprises a compressor and an expansion device.
  • the air stream circuit further comprises an air circulating device for circulating air within the air stream circuit.
  • the machine comprises a control system suitable for activating and/or deactivating the auxiliary heat transferring circuit.
  • the present invention relates to a method for drying laundry in a laundry washing machine of the type comprising a laundry chamber suitable for receiving the laundry to be dried, an air stream circuit for circulating an air stream through said laundry chamber, said air stream circuit comprising:
  • the step of transferring heat comprises a step of extracting heat from the moist air of the air stream coming from the laundry chamber by means of a first auxiliary heat exchanger belonging to a closed loop auxiliary circuit and a step of releasing heat to the dehumidified air leaving the dehumidifying unit by means of a second auxiliary heat exchanger belonging to the closed loop auxiliary circuit.
  • the present invention has proved to be particularly successful when applied to a front-loading drying machine with a rotatable laundry container; however it is clear that the present invention can be applied as well to a top-loading drying machine and also to laundry drying machines of cabinet type, i.e. laundry drying machines where the laundry container does not rotate. Furthermore, the present invention can be usefully applied to all the machines requiring a drying phase for wetted clothes, as for example a combined laundry washing and drying machine. With reference to Figure 1 , reference number 1 indicates as a whole a laundry drying machine 1, or dryer, according to the present invention.
  • the dryer 1 preferably comprises, though not necessarily, a substantially parallelepiped-shaped outer boxlike casing 2 which is preferably structured for resting on the floor and a preferably, though not necessarily, substantially cylindrical rotatable drum 9 which is structured for housing the laundry to be dried.
  • the drum 9 preferably has its front opening or mouth directly facing a laundry loading/unloading pass-through opening provided in the front wall 2a of the boxlike casing 2.
  • a front door 8, pivotally coupled to the front upright side wall 2a, is provided for allowing access to the drum interior region to place laundry to be dried therein.
  • the dryer 1 preferably furthermore comprises an electric motor assembly, not illustrated, which is structured for driving into rotation the rotatable drum about its longitudinal reference axis, preferably by means of a belt/pulley system.
  • the dryer 1 is provided with an air stream circuit 10 which is structured to circulate inside the drum 9 a stream of hot air having a low moisture content.
  • the hot air circulates over and through the laundry located inside the drum 9 to dry the laundry.
  • the air stream circuit 10 is also structured for drawing moist air from the drum 9, cooling down the moist air leaving the drum 9 so to extract and retain the surplus moisture.
  • the dehumidified air is then heated up to a predetermined temperature preferably higher than that of the moist air arriving from the drum 9. Finally the heated, dehumidified air is conveyed again into the drum 9, where it flows over and through the laundry stored inside the rotatable drum 9 to rapidly dry the laundry, as said above.
  • the air stream circuit 10 forms therefore a closed loop for the air A, as schematically illustrated with dashed line in Figure 2 .
  • a fan 12 is preferably arranged along the circuit 10 for generating the air stream, more preferably upstream of the drum 9.
  • the fan 12 is adapted and designed for circulating the air within the air stream circuit 10.
  • the air stream circuit 10 comprises a dehumidifying unit 23 arranged downstream of the drum 9 and a heater unit 21 arranged downstream of the dehumidifying unit 23 and upstream of the drum 9.
  • upstream and downstream are referred to the flowing direction of the air, heated air and/or moist air, during the standard functioning of the dryer; for example saying that the fan is arranged upstream of the drum means that in the standard functioning of the dryer the air firstly passes through the fan and then flows into the drum; saying that the dehumidifying unit is arranged downstream of the drum means that in the standard functioning of the dryer the air firstly circulates inside the drum and then passes through the dehumidifying unit.
  • the dehumidifying unit 23 is preferably connected to the drum 9 by means of a first air circulation path 25.
  • the dehumidifying unit 23 is preferably connected to the heating unit 21 by means of a second air circulation path 26.
  • the moist air condenses and the water generated therein is preferably collected in a tank, not illustrated, arranged below the unit itself 23.
  • the dehumidifying unit 23 is the evaporator of a heat pump system 20 and the heating unit 21 is the condenser of such heat pump system 20.
  • the evaporator 23 dehumidifies the moist air coming from the drum 9 and then the condenser 21 heats up the dehumidified air coming from the evaporator 23. The heated air is then conveyed again into the drum 9.
  • the air stream circuit 10 and the heat pump system 20 are thermally coupled by the condenser 21 and the evaporator 23.
  • the warm moist air which leaves the drum at a first high temperature T1 when passes through the dehumidifying unit 23 is cooled down and then dehumidified so that, at the dehumidifying output 23b, it is at a lower temperature T2.
  • the heat pump system 20 advantageously comprises, other than the condenser 21 and the evaporator 23, an expansion device 22 and a compressor 24.
  • the heat pump system 20 forms also a closed loop.
  • the expansion device 22 preferably comprises a capillary tube.
  • the expansion device may be of different type, for example an expansion valve.
  • the condenser 21 and the evaporator 23 are heat exchangers.
  • heat exchangers are of the serpentine type, comprising respective pipe corrugated in a zigzag pattern.
  • refrigerant An evaporating and condensing fluid, known as refrigerant, flows in the heat pump system 20.
  • refrigerant flows counter-clockwise in a closed loop.
  • the refrigerant is compressed and heated by the compressor 24. From the compressor outlet 24b the heated refrigerant in its gaseous state reaches the condenser 21. In the condenser 21 the refrigerant condenses and cools down while the air stream of the air stream circuit 10 which is blown across the condenser 21 is heated up. The condensed refrigerant then passes through the expansion device 22 where its pressure abruptly decreases and resulting in a mixture of liquid and vapour at a lower temperature and pressure. The cold liquid-vapour mixture from the expansion device outlet then travels through the evaporator 23 and here is heated up and vaporized. This is obtained thanks to the warm moist air of the air stream circuit 10 coming from the drum 9 which is blown across the evaporator 23.
  • the warm moist air coming from the drum 9 at the same time is cooled down and dehumidified, as said above.
  • the resulting refrigerant vapour is then conveyed from the evaporator outlet 23b to the compressor inlet 24a and compressed and heated again by the compressor 24.
  • the heat pump system may comprises a gas cooler instead of the condenser and may comprises a gas heater instead of the evaporator.
  • the refrigerant is advantageously a gas, such as CO 2 , which maintains its gaseous state along all the closed-loop circuit, and in particular in the gas cooler and in the gas heater.
  • the gas temperature changes while passing through the gas cooler and the gas heater.
  • an auxiliary heat transferring circuit 50 interacts with the first air circulation path 25 and the second air circulation path 26 of the air stream circuit 10 so that heat is transferred from the warm moist air coming from the drum 9 to the dehumidified air leaving the evaporator 23.
  • the auxiliary heat transferring circuit 50 preferably comprises a secondary fluid flowing in a closed loop and thermally coupled with the first air circulation path 25 and the second air circulation path 26.
  • the secondary fluid preferably flows inside a sealed duct 51, or pipe, and is thermally coupled to the first and second air circulation paths 25, 26 by means of respective first and second auxiliary heat exchangers 52 and 53.
  • the secondary fluid preferably comprises a liquid, more preferably it comprises water.
  • the first auxiliary heat exchanger 52 comprises an air-fluid exchanger and the second auxiliary heat exchanger 53 comprises a fluid-air exchanger.
  • the secondary fluid may be different and comprising any fluid at a proper pressure suitable to transfer thermal energy, such as a vapour or a liquid-vapour mixture.
  • the secondary fluid is preferably moved inside the closed loop by means of a pump 56, more preferably a hydraulic pump.
  • the pump is arranged downstream the first auxiliary heat exchanger 52 and upstream the second auxiliary heat exchanger 53, as shown in Figure 2 .
  • the pump may be arranged downstream the second heat auxiliary exchanger and upstream the first auxiliary heat exchanger.
  • the heat of the warm moist air coming from the drum 9 is, hence, at least partially transferred to the secondary liquid by means of the first auxiliary heat exchanger 52 before the air reaches the evaporator 23.
  • the warm moist air is cooled down from temperature T1 to a lower intermediate temperature T1' before entering in the evaporator 23, while part of its thermal energy is released to the secondary fluid.
  • the warm moist air coming from the drum 9 before entering in the evaporator 23 is subjected to a pre-cooling by means of the first auxiliary heat exchanger 52
  • the warm moist air reaches the evaporator 23 at such lower intermediate temperature T1' which is close to, or preferably equal to, the saturation temperature Ts.
  • the heat pump system 20 may be designed for a lower nominal functioning power compared to the prior art system and may have therefore reduced dimension, for example having a smaller compressor.
  • the reduction of energy required for condensation may advantageously implies the reduction of the condensation surface of the evaporator and, therefore, the reduction of its dimension.
  • the overall dimension, and cost, of the machine may thus be reduced accordingly.
  • the dehumidified air leaves the evaporator 23 at temperature T2 and flows inside the second circulating path 26, the dehumidified air according to the invention is partially warmed up by the second auxiliary heat exchanger 53.
  • a quantity of heat from the secondary liquid is therefore transferred by means of the second auxiliary heat exchanger 53 to the dehumidified air before it reaches the condenser 21.
  • the dehumidified air enters in the condenser 21 at a higher value T2' with respect to the know technique.
  • the dehumidified air leaving the evaporator 23 before entering in the condenser 21 is subjected to a pre-heating by means of the second auxiliary heat exchanger 53.
  • the warmed air at the condenser output which is conveyed inside the drum 9 has a higher value with respect the temperature of the known technique. This advantageously increases the drying effect of the hot dry air circulating over and through the wet laundry and/or advantageously reduces the duration of the drying process.
  • the heat pump system 20 may be designed for a lower nominal functioning power compared to the prior art system and may have therefore reduced dimension, for example having a smaller compressor.
  • the auxiliary heat transferring circuit 50 may be preferably controlled in order to be activated and/or deactivated at a given time.
  • the auxiliary heat transferring circuit 50 is preferably kept deactivated (switched-off) while the heat pump system 20 is working in its transitional state.
  • the auxiliary heat transferring circuit 50 is advantageously activated.
  • the heat pump system 20 may work more efficiently.
  • the configuration refers to a laundry drying machine which differs from the laundry drying machine 1 previously described for the fact that the dehumidifying unit 123 advantageously comprises an air-air heat exchanger and the heating unit 121 comprises an electrical heater device, preferably an electric heating element such as a resistor.
  • the air-air heat exchanger 123 is in the form of an air-air cross-flow type heat exchanger wherein the moist air crossing the exchanger 123 is cooled by an air cooling flow F, preferably ambient air, passing through the exchanger 123 itself and not mixing with the moist air.
  • an air cooling flow F preferably ambient air
  • the air-air heat exchanger 123 is connected to the drum 9 by means of the first air circulation path 25 and the air-air heat exchanger 123 is connected to the electrical heater 121 by means of the second air circulation path 26.
  • the auxiliary heat transferring circuit 50 interacts with the first air circulation path 25 and the second air circulation path 26 of the air stream circuit 10 so that heat is transferred from the warm moist air coming from the drum 9 to the dehumidified air leaving the air-air heat exchanger 123.
  • the heat of the warm moist air coming from the drum 9 is, hence, at least partially transferred to the secondary liquid by means of the first auxiliary heat exchanger 52 before the air reaches the air-air heat exchanger 123.
  • the warm moist air is cooled down from temperature T1 to a lower intermediate temperature T1' before entering in the air-air heat exchanger 123, while part of its thermal energy is released to the secondary fluid of the heat transferring circuit 50.
  • the warm moist air reaches the air-air heat exchanger 123 at such lower intermediate temperature T1' which is close to, or preferably equal to, the saturation temperature Ts.
  • the air cooling flow F of the air-air heat exchanger 123 may have a reduced mass flow rate compared to the prior art system and may have therefore reduced dimension, for example having smaller conveying ducts for the air cooling flow F or having air forcing means, typically a fan, of reduced dimension and/or nominal power.
  • the reduction of energy required for condensation may advantageously implies the reduction of the condensation surface of the air-air heat exchanger 123 and therefore the reduction of its dimension.
  • the overall dimension, and cost, of the machine may thus be reduced accordingly.
  • the dehumidified air leaves the air-air heat exchanger 123 at temperature T2 and flows inside the second circulating path 26, the dehumidified air according to the invention is partially warmed up by the second auxiliary heat exchanger 53.
  • a quantity of heat from the secondary liquid is therefore transferred by means of the second auxiliary heat exchanger 53 to the dehumidified air before it reaches the electrical heater 121.
  • the dehumidified air enters in the electrical heater 121 at a higher value T2' with respect to the know technique.
  • the warmed air at the electrical heater output which is conveyed inside the drum 9, has a higher value with respect the temperature of the known technique. This advantageously increases the drying effect of the hot dry air circulating over and through the wet laundry and/or advantageously reduces the duration of the drying process.
  • the temperature of the air which is conveyed inside the drum 9 is maintained at the same value as in the known machine, less energy is required for heating the dehumidified air, thus increasing the efficiency of the drying operation.
  • the power dissipation of the electrical heater 121 may be lower with respect the known machine.
  • the auxiliary heat transferring circuit 50 may be preferably controlled in order to be activated and/or deactivated at a given time.
  • the auxiliary heat transferring circuit 50 is preferably kept deactivated (switched-off) for a given period of time (transitional phase) while the electrical heater 121 reaches its steady state.
  • the auxiliary heat transferring circuit 50 is advantageously activated after the transitional phase.
  • the present invention allows all the set objects to be achieved.
  • it makes it possible to obtain a laundry drying machine having a higher energy efficiency compared to the systems of known type.
  • changes may be made to the laundry drying machine as described herein without, however, departing from the scope of the present invention.
  • the dehumidifying unit and the heating unit may be of any type and different from the units above described.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP12178467.2A 2012-07-30 2012-07-30 Procédé de séchage du linge dans un sèche-linge et sèche-linge Withdrawn EP2692940A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12178467.2A EP2692940A1 (fr) 2012-07-30 2012-07-30 Procédé de séchage du linge dans un sèche-linge et sèche-linge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12178467.2A EP2692940A1 (fr) 2012-07-30 2012-07-30 Procédé de séchage du linge dans un sèche-linge et sèche-linge

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EP2692940A1 true EP2692940A1 (fr) 2014-02-05

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3023533A1 (fr) * 2014-11-20 2016-05-25 LG Electronics Inc. Appareil de traitement de vêtements avec cycle à pompe à chaleur
EP3040470A1 (fr) * 2014-12-29 2016-07-06 LG Electronics Inc. Appareil de traitement de vêtements
CN106400423A (zh) * 2015-07-31 2017-02-15 杭州三花家电热管理***有限公司 烘干***及干燥装置
CN107034645A (zh) * 2015-07-31 2017-08-11 杭州三花家电热管理***有限公司 烘干***及干燥装置
CN110331566A (zh) * 2015-01-30 2019-10-15 杭州三花研究院有限公司 烘干***及其使用方法
CN114687178A (zh) * 2020-12-30 2022-07-01 广东美的白色家电技术创新中心有限公司 衣物处理装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2914859A1 (de) * 1979-04-12 1980-10-30 Bauknecht Gmbh G Waeschetrockner
GB2092729A (en) * 1981-01-07 1982-08-18 Technoscript Ab Regenerative Dryer
DE4306215A1 (de) * 1993-02-27 1994-09-01 Licentia Gmbh Programmgesteuerter Wäschetrockner mit einem Wärmepumpenkreis
GB2375812A (en) * 2001-04-05 2002-11-27 Dbk Technitherm Ltd Drying apparatus with heat exchanger and heat pump
US20050066538A1 (en) * 2003-09-29 2005-03-31 Michael Goldberg Heat pump clothes dryer
WO2010140334A1 (fr) * 2009-06-04 2010-12-09 パナソニック株式会社 Dispositif de séchage

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2914859A1 (de) * 1979-04-12 1980-10-30 Bauknecht Gmbh G Waeschetrockner
GB2092729A (en) * 1981-01-07 1982-08-18 Technoscript Ab Regenerative Dryer
DE4306215A1 (de) * 1993-02-27 1994-09-01 Licentia Gmbh Programmgesteuerter Wäschetrockner mit einem Wärmepumpenkreis
GB2375812A (en) * 2001-04-05 2002-11-27 Dbk Technitherm Ltd Drying apparatus with heat exchanger and heat pump
US20050066538A1 (en) * 2003-09-29 2005-03-31 Michael Goldberg Heat pump clothes dryer
WO2010140334A1 (fr) * 2009-06-04 2010-12-09 パナソニック株式会社 Dispositif de séchage

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3023533A1 (fr) * 2014-11-20 2016-05-25 LG Electronics Inc. Appareil de traitement de vêtements avec cycle à pompe à chaleur
US10240276B2 (en) 2014-11-20 2019-03-26 Lg Electronics Inc. Clothes treating apparatus with heat pump cycle and method for controlling the same
EP3040470A1 (fr) * 2014-12-29 2016-07-06 LG Electronics Inc. Appareil de traitement de vêtements
US9803313B2 (en) 2014-12-29 2017-10-31 Lg Electronics Inc. Clothes treating apparatus
CN110331566A (zh) * 2015-01-30 2019-10-15 杭州三花研究院有限公司 烘干***及其使用方法
CN106400423A (zh) * 2015-07-31 2017-02-15 杭州三花家电热管理***有限公司 烘干***及干燥装置
CN107034645A (zh) * 2015-07-31 2017-08-11 杭州三花家电热管理***有限公司 烘干***及干燥装置
CN107034645B (zh) * 2015-07-31 2019-09-27 浙江三花智能控制股份有限公司 烘干***及干燥装置
CN106400423B (zh) * 2015-07-31 2019-10-22 浙江三花智能控制股份有限公司 烘干***及干燥装置
CN114687178A (zh) * 2020-12-30 2022-07-01 广东美的白色家电技术创新中心有限公司 衣物处理装置

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