WO2014180696A1 - A thermoelectric heat pump laundry dryer - Google Patents

A thermoelectric heat pump laundry dryer Download PDF

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Publication number
WO2014180696A1
WO2014180696A1 PCT/EP2014/058601 EP2014058601W WO2014180696A1 WO 2014180696 A1 WO2014180696 A1 WO 2014180696A1 EP 2014058601 W EP2014058601 W EP 2014058601W WO 2014180696 A1 WO2014180696 A1 WO 2014180696A1
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WO
WIPO (PCT)
Prior art keywords
drying duct
processing air
inlet opening
hot side
valve
Prior art date
Application number
PCT/EP2014/058601
Other languages
French (fr)
Inventor
Yavuz Sahin
Mehmet Kaya
Erdem An
Onur Hartoka
Original Assignee
Arcelik Anonim Sirketi
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 Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Priority to EP14719781.8A priority Critical patent/EP2994566A1/en
Publication of WO2014180696A1 publication Critical patent/WO2014180696A1/en

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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

Definitions

  • the present invention relates to a laundry dryer comprising a thermoelectric heat pump.
  • the drying air activated by a fan dehumidifies the laundry by being passed over the laundry and the water vapor in the air is condensed at the condenser.
  • the drying air dehumidified at the condenser is then heated by being passed over the heater, thus hot and dry air is delivered onto the laundry.
  • laundry dryers generally air cooled type condensers are used. The air sucked by means of the cooling fan from the outer environment is delivered to the condenser and thus the drying air passing through the condenser is enabled to be condensed by being cooled.
  • thermoelectric heat pumps are also used in laundry dryers in addition to the condenser and the heater.
  • thermoelectric heat pumps are also named as Peltier elements.
  • the thermoelectric heat pumps have hot and cold sides and perform both the functions of condensing by cooling and also heating the drying air. While the hot side of the thermoelectric heat pumps used in laundry dryers assists the heater, the cold side assists the condenser. In the process of drying the laundry, the drying air is cooled by some amount while being passed over the condenser, afterwards is passed over the thermoelectric heat pump and thereby the dehumidification process of the drying air is realized in two stages. Similarly, the heating process is also performed in two stages.
  • the drying air which is almost completely dehumidified by passing through the condenser and the cold side of the thermoelectric heat pump, is heated some amount by being passed over the hot side of the thermoelectric heat pump and afterwards the heating process is completed by the drying air being passed over the main heater.
  • the lower the temperature difference between the hot and cold surfaces of the Peltier element is, the higher the performance of the Peltier element.
  • thermoelectric (Peltier) heat pump that has a cold side and a hot side.
  • the aim of the present invention is the realization of a laundry dryer wherein the effectiveness of the Peltier element is improved.
  • the laundry dryer realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises a Peltier element having a hot side and a cold side, some of the processing air activated by the processing air fan after leaving the drum continues its path in the drying duct passing from the condenser, the hot side, the cold side and the heater respectively and is delivered again to the drum in a dehumidified and heated state.
  • the remainder of the drying air is guided directly to the hot side of the Peltier element by means of a divider disposed in the drying duct, without circulating through the condenser and the cold side of the Peltier element and is again delivered to the drum over the main heater.
  • the processing air is prevented from reaching the hot side or the processing air is allowed to reach the hot side.
  • the valve changes to the closed position, thus preventing the delivery of the processing air to the hot side so that the temperature difference between the hot side and the cold side is not high.
  • control unit changes the valve to the closed position (C) or the open position (O) depending on the temperature data received from the temperature sensor.
  • control unit changes the valve to the closed position (C) or the open position (O) depending on the humidity data received from the humidity sensor.
  • valve is disposed on the divider and changed to the closed position (C) by rotating an actuation mechanism and changed to the open position (O) by being rotated from the closed position (C).
  • the effectiveness of the Peltier element is increased by decreasing the temperature difference between the hot side and the cold side of the Peltier element by means of the valve.
  • Figure 1 – is the schematic view of a laundry dryer.
  • Figure 2 – is the schematic view of the drying duct, the condenser, the Peltier element and the divider that are situated in a laundry dryer.
  • Second drying duct 4 Fan 5. Heater 6. Condenser 7. Peltier element 8. Cold side 9. Hot side 10. Inlet opening
  • the laundry dryer (1) comprises a body, a drum (2) wherein the laundry is placed, a drying duct (3) wherein the processing air is circulated, a fan (4) providing the circulation of the processing air in the drying duct (3), a heater (5) that heats the processing air, a condenser (6) providing the dehumidification of the processing air, and a Peltier element (7) that is disposed after the condenser (6) in the drying duct (3) and that condenses by cooling and afterwards heats the processing air passing thereover.
  • the Peltier element (7) comprises a cold side (8) that condenses the processing air passing thereover by cooling, a hot side (9) that heats the processing air passing thereover and an inlet opening (10) that is arranged at the hot side (9) and that enables the processing air to enter the hot side (9).
  • the laundry dryer (1) furthermore, comprises a divider (11)
  • the laundry dryer (1) of the present invention comprises a valve (12) that has
  • the valve (12) When the temperature of the processing air is high, the valve (12) is kept in the closed position (C), thus enabling the processing air to be guided directly to the second drying duct (3’’) without reaching the first drying duct (3’).
  • the hot processing air By preventing the hot processing air from being directed to the hot side (9), the temperature difference between the hot side (9) and the cold side (8) is prevented from increasing.
  • the Peltier element (7) is positioned horizontally inside the body of the laundry dryer (1), the cold side (8) is situated below, and the hot side (9) above, and the condenser (6) is situated under the cold side (8), at the lowermost place inside the body of the laundry dryer (1).
  • the said elements are arranged one above the other from the drum (2) towards the base as the hot side (9) – the cold side (8) – the condenser (6).
  • the divider (11) guides some of the processing air leaving the drum (2) and flowing in the drying duct (3) to the first drying duct (3’), and the remainder to the second drying duct (3’’).
  • the first drying duct (3’) functions as the bypass duct for some of the processing air; the processing air flowing in the first drying duct (3’) is delivered directly to the hot side (9) of the Peltier element (7) by being passed from the upper inlet opening (10’), without circulating the condenser (6) and the cold side (8); and the processing air leaving the hot side (9) is again delivered to the drum (2) by being passed over the heater (5).
  • the processing air flowing in the second drying duct (3’) is delivered to the hot side (9) of the Peltier element (7) by being passed from the lower inlet opening (10’’) after circulating the condenser (6) and the cold side (8), mixes with the processing air entering the hot side (9) from the upper inlet opening (10’) and enters the drum (2) again by passing from the heater (5).
  • the divider (11) enables at least some of the processing air to be delivered directly to the hot side (9) by passing through the first drying duct (3’) without losing pressure and without circulating the condenser (6) and the cold side (8) and from there to be delivered to the drum (2) again over the heater (5).
  • the divider (11) enables the processing air flowing through both the first drying duct (3’) and the second drying duct (3’’) to enter the hot side (9) from the upper inlet opening (10’) and the lower inlet opening (10’’) by dividing the inlet opening (10) on the hot side (9) of the Peltier element (7) into two, and the hot air coming from the first drying duct (3’) and the second drying duct (3’’) continues flowing by uniting at the hot side (9).
  • the volumetric flow of the processing air is increased, pressure losses are minimized and the Peltier element (7) is enabled to operate more effectively.
  • the laundry dryer (1) comprises a control unit (13) and a temperature sensor (14) that is disposed at the drying duct (3) or the drum (2).
  • the control unit (13) changes the valve (12) to the closed position (C) from the open position (O) or to the open position (O) from the closed position (C) according to the data received from the temperature sensor (14).
  • T L a limit temperature value predetermined by the producer
  • the valve (12) is changed to the closed position (C).
  • the processing air with a temperature above the limit temperature value T L is prevented from being delivered to the hot side (9) of the Peltier element (7).
  • the temperature difference between the hot side (9) and the cold side (8) is prevented from increasing.
  • the laundry dryer (1) comprises a humidity sensor (15) that is disposed at the drying duct (3) or the drum (2).
  • the control unit (13) changes the valve (12) to the closed position (C) from the open position (O) or to the open position (O) from the closed position (C) according to the data received from the humidity sensor (15).
  • the valve (12) is changed to the closed position (C) when the humidity H p of the processing air reaches a limit humidity value H L predetermined by the producer.
  • the ongoing drying step is defined and the valve (12) is changed to the closed position (C) especially when the very high temperature values are reached at the end of the drying step.
  • the laundry dryer (1) comprises an actuation mechanism (16) that enables the valve (12) to be opened/closed.
  • the valve (12) is pivotally mounted onto the divider (11).
  • the valve (12) that prevents or allows the passage of the processing air to the hot side (9), changes to the closed position (C) or the open position (O) by rotating.

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

Abstract

The present invention relates to a laundry dryer (1) comprising a drum (2) wherein the laundry is placed, a drying duct (3) wherein the processing air is circulated, a fan (4) that provides the circulation of the processing air in the drying duct (3), a heater (5) that heats the processing air, a condenser (6) that provides the dehumidification of the processing air, and a Peltier element (7) that is disposed in the drying duct (3), that condenses the processing air passing thereover by cooling, and heats afterwards, that has a cold side (8), a hot side (9) and an inlet opening (10) that provides entry of the processing air into the hot side (9).

Description

A THERMOELECTRIC HEAT PUMP LAUNDRY DRYER
The present invention relates to a laundry dryer comprising a thermoelectric heat pump.
In laundry dryers wherein the drying air is circulated within a closed cycle, the drying air activated by a fan dehumidifies the laundry by being passed over the laundry and the water vapor in the air is condensed at the condenser. The drying air dehumidified at the condenser is then heated by being passed over the heater, thus hot and dry air is delivered onto the laundry. In laundry dryers generally air cooled type condensers are used. The air sucked by means of the cooling fan from the outer environment is delivered to the condenser and thus the drying air passing through the condenser is enabled to be condensed by being cooled. In the state of the art, thermoelectric heat pumps are also used in laundry dryers in addition to the condenser and the heater. The thermoelectric heat pumps are also named as Peltier elements. The thermoelectric heat pumps have hot and cold sides and perform both the functions of condensing by cooling and also heating the drying air. While the hot side of the thermoelectric heat pumps used in laundry dryers assists the heater, the cold side assists the condenser. In the process of drying the laundry, the drying air is cooled by some amount while being passed over the condenser, afterwards is passed over the thermoelectric heat pump and thereby the dehumidification process of the drying air is realized in two stages. Similarly, the heating process is also performed in two stages. The drying air, which is almost completely dehumidified by passing through the condenser and the cold side of the thermoelectric heat pump, is heated some amount by being passed over the hot side of the thermoelectric heat pump and afterwards the heating process is completed by the drying air being passed over the main heater. In the said laundry dryers wherein the heater, the condenser and the thermoelectric heat pump are used together, the lower the temperature difference between the hot and cold surfaces of the Peltier element is, the higher the performance of the Peltier element. In the state of the art, there is no embodiment that prevents the performance of the Peltier element from decreasing.
In the International Patent Application No. WO2011154336, a laundry dryer is described, comprising a thermoelectric (Peltier) heat pump that has a cold side and a hot side.
The aim of the present invention is the realization of a laundry dryer wherein the effectiveness of the Peltier element is improved.
The laundry dryer realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises a Peltier element having a hot side and a cold side, some of the processing air activated by the processing air fan after leaving the drum continues its path in the drying duct passing from the condenser, the hot side, the cold side and the heater respectively and is delivered again to the drum in a dehumidified and heated state. The remainder of the drying air is guided directly to the hot side of the Peltier element by means of a divider disposed in the drying duct, without circulating through the condenser and the cold side of the Peltier element and is again delivered to the drum over the main heater. By means of the valve, the processing air is prevented from reaching the hot side or the processing air is allowed to reach the hot side. When the temperature of the processing air increases, the valve changes to the closed position, thus preventing the delivery of the processing air to the hot side so that the temperature difference between the hot side and the cold side is not high.
In an embodiment of the present invention, the control unit changes the valve to the closed position (C) or the open position (O) depending on the temperature data received from the temperature sensor.
In another embodiment of the present invention, the control unit changes the valve to the closed position (C) or the open position (O) depending on the humidity data received from the humidity sensor.
In another embodiment of the present invention, the valve is disposed on the divider and changed to the closed position (C) by rotating an actuation mechanism and changed to the open position (O) by being rotated from the closed position (C).
In the laundry dryer of the present invention, the effectiveness of the Peltier element is increased by decreasing the temperature difference between the hot side and the cold side of the Peltier element by means of the valve.
The laundry dryer realized in order to attain the aim of the present invention is illustrated in the attached figures, where:
Figure 1 – is the schematic view of a laundry dryer.
Figure 2 – is the schematic view of the drying duct, the condenser, the Peltier element and the divider that are situated in a laundry dryer.
The elements illustrated in the figures are numbered as follows:
  1. Laundry dryer
  2. Drum
  3. Drying duct
3’. First drying duct
3’’. Second drying duct
4. Fan
5. Heater
6. Condenser
7. Peltier element
8. Cold side
9. Hot side
10. Inlet opening
10’. Upper inlet opening
10’’. Lower inlet opening
11. Divider
12. Valve
13. Control unit
14. Temperature sensor
15. Humidity sensor
16. Actuation mechanism
The laundry dryer (1) comprises a body, a drum (2) wherein the laundry is placed, a drying duct (3) wherein the processing air is circulated, a fan (4) providing the circulation of the processing air in the drying duct (3), a heater (5) that heats the processing air, a condenser (6) providing the dehumidification of the processing air, and a Peltier element (7) that is disposed after the condenser (6) in the drying duct (3) and that condenses by cooling and afterwards heats the processing air passing thereover.
The Peltier element (7) comprises a cold side (8) that condenses the processing air passing thereover by cooling, a hot side (9) that heats the processing air passing thereover and an inlet opening (10) that is arranged at the hot side (9) and that enables the processing air to enter the hot side (9).
The laundry dryer (1), furthermore, comprises a divider (11)
- that is disposed in the drying duct (3),
- that, with one end extending inside the drying duct (3), divides the drying duct (3) into two, being the first drying duct (3’) and the second drying duct (3’’),
- that, with the other end extending to the inlet opening (10), divides the inlet opening (10) into two sections as the upper inlet opening (10’) and the lower inlet opening (10’’),
- that guides the processing air flowing in the first drying duct (3’) directly to the hot side (9) from the upper inlet opening (10’), without circulating the condenser (6) and the cold side (8) and
- that guides the processing air flowing in the second drying duct (3’’) and circulating the condenser (6) and the cold side (8) to the hot side (9) from the lower inlet opening (10’’).
The laundry dryer (1) of the present invention comprises a valve (12) that has
  • an open position (O) wherein the valve (12) opens the first drying duct (3’) and thus enables the processing air to be partially directed to the hot side (9) from the upper inlet opening (10’), and
  • a closed position (O) wherein the valve (12) closes the first drying duct (3’) and thus prevents the processing air from entering the hot side (9) from the upper inlet opening (10’) and directs it to the condenser (6) (Figure 1, Figure 2).
When the temperature of the processing air is high, the valve (12) is kept in the closed position (C), thus enabling the processing air to be guided directly to the second drying duct (3’’) without reaching the first drying duct (3’). By preventing the hot processing air from being directed to the hot side (9), the temperature difference between the hot side (9) and the cold side (8) is prevented from increasing.
The Peltier element (7) is positioned horizontally inside the body of the laundry dryer (1), the cold side (8) is situated below, and the hot side (9) above, and the condenser (6) is situated under the cold side (8), at the lowermost place inside the body of the laundry dryer (1). The said elements are arranged one above the other from the drum (2) towards the base as the hot side (9) – the cold side (8) – the condenser (6).
The divider (11) guides some of the processing air leaving the drum (2) and flowing in the drying duct (3) to the first drying duct (3’), and the remainder to the second drying duct (3’’). The first drying duct (3’) functions as the bypass duct for some of the processing air; the processing air flowing in the first drying duct (3’) is delivered directly to the hot side (9) of the Peltier element (7) by being passed from the upper inlet opening (10’), without circulating the condenser (6) and the cold side (8); and the processing air leaving the hot side (9) is again delivered to the drum (2) by being passed over the heater (5). The processing air flowing in the second drying duct (3’) is delivered to the hot side (9) of the Peltier element (7) by being passed from the lower inlet opening (10’’) after circulating the condenser (6) and the cold side (8), mixes with the processing air entering the hot side (9) from the upper inlet opening (10’) and enters the drum (2) again by passing from the heater (5).
The divider (11) enables at least some of the processing air to be delivered directly to the hot side (9) by passing through the first drying duct (3’) without losing pressure and without circulating the condenser (6) and the cold side (8) and from there to be delivered to the drum (2) again over the heater (5). The divider (11) enables the processing air flowing through both the first drying duct (3’) and the second drying duct (3’’) to enter the hot side (9) from the upper inlet opening (10’) and the lower inlet opening (10’’) by dividing the inlet opening (10) on the hot side (9) of the Peltier element (7) into two, and the hot air coming from the first drying duct (3’) and the second drying duct (3’’) continues flowing by uniting at the hot side (9). Thus, the volumetric flow of the processing air is increased, pressure losses are minimized and the Peltier element (7) is enabled to operate more effectively.
In an embodiment of the present invention, the laundry dryer (1) comprises a control unit (13) and a temperature sensor (14) that is disposed at the drying duct (3) or the drum (2). The control unit (13) changes the valve (12) to the closed position (C) from the open position (O) or to the open position (O) from the closed position (C) according to the data received from the temperature sensor (14). When the temperature of the processing air Tp reaches a limit temperature value TL predetermined by the producer, the valve (12) is changed to the closed position (C). Thus, the processing air with a temperature above the limit temperature value TL is prevented from being delivered to the hot side (9) of the Peltier element (7). Thus, the temperature difference between the hot side (9) and the cold side (8) is prevented from increasing.
In an embodiment of the present invention, the laundry dryer (1) comprises a humidity sensor (15) that is disposed at the drying duct (3) or the drum (2). The control unit (13) changes the valve (12) to the closed position (C) from the open position (O) or to the open position (O) from the closed position (C) according to the data received from the humidity sensor (15). In order to decrease the temperature difference between the hot side (9) and the cold side (8), the valve (12) is changed to the closed position (C) when the humidity Hp of the processing air reaches a limit humidity value HL predetermined by the producer. Moreover, the ongoing drying step is defined and the valve (12) is changed to the closed position (C) especially when the very high temperature values are reached at the end of the drying step.
In an embodiment of the present invention, the laundry dryer (1) comprises an actuation mechanism (16) that enables the valve (12) to be opened/closed. The valve (12) is pivotally mounted onto the divider (11). The valve (12), that prevents or allows the passage of the processing air to the hot side (9), changes to the closed position (C) or the open position (O) by rotating.
In the laundry dryer (1) of the present invention, delivering the processing air to the hot side (9) or not is controlled by means of the valve (12). Thus, the effectiveness of the Peltier element (7) is increased.

Claims (4)

  1. A laundry dryer (1) comprising a drum (2) wherein the laundry is placed, a drying duct (3) wherein the processing air is circulated, a fan (4) providing the circulation of processing air in the drying duct (3), a heater (5) that heats the processing air, a condenser (6) providing the dehumidification of the processing air, a Peltier element (7) that is disposed after the condenser (6) in the drying duct (3), having a cold side (8) that condenses the processing air passing thereover by cooling, a hot side (9) that heats the processing air passing thereover and an inlet opening (10) that is arranged at the hot side (9) and that provides entry of the processing air to the hot side (9); and a divider (11) that is disposed in the drying duct (3), that, with one end extending inside the drying duct (3), divides the drying duct (3) into two, being the first drying duct (3’) and the second drying duct (3’’), that, with the other end extending to the inlet opening (10), divides the inlet opening into two sections as the upper inlet opening (10’) and the lower inlet opening (10’’), that guides the processing air flowing in the first drying duct (3’) directly to the hot side (9) from the upper inlet opening (10’), and that guides the processing air flowing in the second drying duct (3’’) and circulating the condenser (6) and the cold side (8) to the hot side (9) from the lower inlet opening (10’’), characterized by a valve (12) that has
    – an open position (O) wherein the valve (12) opens the first drying
    duct (3’) and thus enables the processing air to be partially directed
    to the hot side (9) from the upper inlet opening (10’), and
    – a closed position (O) wherein the valve (12) closes the first drying duct (3’) and thus prevents the processing air from entering the hot side (9) from the upper inlet opening (10’) and directs it to the condenser (6).
  2. – A laundry dryer (1) as in Claim 1, characterized by a control unit (13), a temperature sensor (14) that is disposed at the drying duct (3) or the drum (2) and the valve (12) that is changed to the closed position (C) from the open position (O) or to the open position (O) from the closed position (C) by the control unit (13) according to the data received from the temperature sensor (14).
  3. – A laundry dryer (1) as in Claim 1, characterized by a humidity sensor (15) that is disposed at the drying duct (3) or the drum (2) and the valve (12) that is changed to the closed position (C) from the open position (O) or to the open position (O) from the closed position (C) by the control unit (13) according to the data received from the humidity sensor (15).
  4. 4 - A laundry dryer (1) as in any one of the above claims, characterized by the valve (12) that is pivotally mounted onto the divider (11) and an actuation mechanism (16) that enables the valve (12) to be opened/closed.
PCT/EP2014/058601 2013-05-09 2014-04-28 A thermoelectric heat pump laundry dryer WO2014180696A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14719781.8A EP2994566A1 (en) 2013-05-09 2014-04-28 A thermoelectric heat pump laundry dryer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201305559 2013-05-09
TRA2013/05559 2013-05-09

Publications (1)

Publication Number Publication Date
WO2014180696A1 true WO2014180696A1 (en) 2014-11-13

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WO (1) WO2014180696A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140310976A1 (en) * 2013-04-23 2014-10-23 Whirlpool Corporation Dryer or washer dryer and method for this operation

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006026251A1 (en) * 2006-06-06 2007-12-13 BSH Bosch und Siemens Hausgeräte GmbH Apparatus and method for drying laundry
WO2011151204A2 (en) * 2010-06-04 2011-12-08 Arcelik Anonim Sirketi A thermoelectric heat pump laundry dryer wherein energy is saved
WO2011154336A1 (en) 2010-06-07 2011-12-15 Arcelik Anonim Sirketi A thermoelectric heat pump laundry dryer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006026251A1 (en) * 2006-06-06 2007-12-13 BSH Bosch und Siemens Hausgeräte GmbH Apparatus and method for drying laundry
WO2011151204A2 (en) * 2010-06-04 2011-12-08 Arcelik Anonim Sirketi A thermoelectric heat pump laundry dryer wherein energy is saved
WO2011154336A1 (en) 2010-06-07 2011-12-15 Arcelik Anonim Sirketi A thermoelectric heat pump laundry dryer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140310976A1 (en) * 2013-04-23 2014-10-23 Whirlpool Corporation Dryer or washer dryer and method for this operation
US9389018B2 (en) * 2013-04-23 2016-07-12 Whirlpool Corporation Dryer or washer dryer and method for this operation

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