EP3887592A1 - A laundry dryer with a water-cooled condenser - Google Patents

A laundry dryer with a water-cooled condenser

Info

Publication number
EP3887592A1
EP3887592A1 EP19797716.8A EP19797716A EP3887592A1 EP 3887592 A1 EP3887592 A1 EP 3887592A1 EP 19797716 A EP19797716 A EP 19797716A EP 3887592 A1 EP3887592 A1 EP 3887592A1
Authority
EP
European Patent Office
Prior art keywords
process air
condenser
temperature
water
laundry
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.)
Granted
Application number
EP19797716.8A
Other languages
German (de)
French (fr)
Other versions
EP3887592B1 (en
Inventor
Mutlu IPEK
Vasi Kadir Ertis
Samet HOCAOGLU
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.)
Arcelik AS
Original Assignee
Arcelik AS
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 AS filed Critical Arcelik AS
Publication of EP3887592A1 publication Critical patent/EP3887592A1/en
Application granted granted Critical
Publication of EP3887592B1 publication Critical patent/EP3887592B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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 
    • D06F58/24—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
    • D06F58/30—Drying processes 
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • 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 laundry dryer comprising a water-cooled condenser.
  • the cooled air is passed over the heat in the air duct by means of the fan to be reheated and then directed to the drum.
  • the cooling water sprayed in the condenser and the water condensed from the air is discharged by means of the pump under the air duct.
  • the energy consumption of the conventional laundry dryers comprising a water-cooled condenser and a heater is higher than that of the heat pump dryers.
  • Patent Application No. CN101805974 (A) relates to a laundry washer-dryer with improved dehumidification efficiency.
  • Patent Application No. KR20020090872 (A) relates to a laundry washer-dryer comprising a water-cooled condenser.
  • the condenser In the condenser, the water-air contact area and heat transfer performance are increased with different designs.
  • the aim of the present invention is the realization of a laundry dryer comprising a water-cooled condenser and wherein the dehumidification capacity can be changed according to the drying speed.
  • the laundry dryer realized in order to attain the aim of the present invention comprises a water-cooled condenser which is disposed in the air circulation duct and which dehumidifies the process air.
  • a temperature sensor is provided in the air circulation filter region while a humidity sensor is provided in the drum.
  • a variable flow valve for delivering condensation water into the condenser at different flow rates is connected to the water supply line which provides the spraying of cold water to the condenser for condensing the process air.
  • the control unit changes the flow rate of the cold water delivered into the condenser by the variable flow valve such that the process air temperature is kept around a predetermined set temperature.
  • Figure 1 - is the schematic view of a laundry dryer comprising a water-cooled condenser.
  • the laundry dryer (1) comprises a drum (2) wherein the laundry to be dried is loaded; an air circulation duct (3) which enables the process air to be passed over the laundry in the drum (2); a fan (4) which is disposed in the air circulation duct (3) and which provides the process air cycle; a resistance heater (5) which is disposed in the air circulation duct (3) at the inlet of the drum (2) and which heats the process air; a water-cooled condenser (6) which is disposed in the air circulation duct (3) and which dehumidifies the process air; a water supply line (8) which enables the cooling water (condensation water) to be taken into the condenser (6) from the water mains (7); at least one nozzle (9) which extends from the water supply line (8) into the condenser (6) and which sprays cold water onto the humid air coming from the air circulation duct (3) into the condenser (6); a temperature sensor (11), for example an NTC (Negative Temperature Coefficient) thermistor, which is disposed
  • the laundry dryer (1) of the present invention comprises
  • variable flow valve (13) which is connected to the water supply line (8) at the outlet of the water mains (7) and which delivers condensation water into the condenser (6) at different flow rates, and
  • control unit (14) which, during the drying process, changes the flow rate of the cold water delivered into the condenser (6) by the variable flow valve (13) such that the process air temperature is kept around a predetermined set temperature (T-set) depending on the data received from the temperature sensor (11) and/or the humidity sensor (12).
  • control unit (14) decreases the flow rate of the cooling water delivered from the variable flow valve (13) into the condenser (6), thus increasing the process air temperature.
  • control unit (14) increases the flow rate of the cooling water delivered from the variable flow valve (13) into the condenser (6), thus decreasing the process air temperature.
  • control unit (14) decides that the process air temperature is below the set temperature (T-set), and decreases the flow rate of the cooling water delivered from the variable flow valve (13) into the condenser (6), thus increasing the process air temperature.
  • control unit (14) decides that the process air temperature is above the set temperature (T-set), and increases the flow rate of the cooling water delivered from the variable flow valve (13) into the condenser (6), thus decreasing the process air temperature.
  • the process air passes through the filter (10) and the condenser (6) after leaving the drum (2). While passing through the condenser (6), the process air circulated in the air circulation duct (3) by the fan (4) is condensed by means of the cold water coming from the water supply line (8) and sprayed by the nozzles (9), and then the condensate is discharged. After leaving the condenser (6), the process air is passed over the heater (5) at the drum (2) inlet part of the air circulation duct (3), and hot dry process air is sent onto the laundry. The heater (5) is operated in an on-off manner continuously or intermittently depending on the process air temperature measured by the temperature sensor.
  • the heater (5) is operated at high power until the process air temperature reaches the predetermined set temperature (T-set) (approximately 75 o C). The power of the heater (5) is decreased once the set temperature (T-set) is reached. The heater (5) is operated in an on-off manner such that the process air temperature oscillates around the set temperature (T-set). Depending on the data received from the temperature sensor (11) and the humidity sensor (12), the control unit (14) decides whether the process air temperature is below or above the set temperature (T-set).
  • the control unit (14) decreases the flow rate of the cooling water delivered from the variable flow valve (13) into the condenser (6), and increases the process air temperature close to the set temperature (T-set). If the process air temperature is high, the control unit (14) increases the flow rate of the cooling water delivered from the variable flow valve (13) into the condenser (6), and decreases the process air temperature close to the set temperature (T-set).
  • the variable flow valve (13) varying amounts of water are sprayed into the condenser (6), thus the process air temperature is kept around the set temperature (T-set) during the drying process, enabling the humidity in the fabric to be more quickly evaporated.
  • control unit adjusts the amount of water delivered by the variable flow valve (13) to the condenser (6).
  • the dehumidification performance is improved, the laundry is prevented from overdrying and from getting damaged while the drying time and hence the energy consumption is decreased.

Landscapes

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

Abstract

The present invention relates to a laundry dryer (1) comprising a drum (2) wherein the laundry to be dried is loaded; an air circulation duct (3) which enables the process air to be passed over the laundry in the drum (2); a fan (4) which is disposed in the air circulation duct (3) and which moves the process air; a resistance heater (5) which heats the process air; a water-cooled condenser (6) which is disposed in the air circulation duct (3) and which dehumidifies the process air; a water supply line (8) which enables the cooling water to be taken into the condenser (6); at least one nozzle (9) which sprays cold water onto the humid air coming into the condenser (6); a temperature sensor (11) which detects the process air temperature; a humidity sensor (12) which is disposed in the drum (2); and a variable flow valve (13) which is connected to the water supply line (8) and which delivers condensation water into the condenser (6) at different flow rates.

Description

    A LAUNDRY DRYER WITH A WATER-COOLED CONDENSER
  • The present invention relates to a laundry dryer comprising a water-cooled condenser.
  • In conventional laundry dryers wherein the drying air is circulated through a closed cycle, the drying air moved by a fan is passed over the laundry inside the drum to be dehumidified and the water vapor in the air is condensed in the condenser. The drying air dehumidified in the condenser is then heated by being passed over the heater, and thus hot and dry air is delivered onto the laundry in the drum. After passing through the filter, the air passing over the laundry in the drum enters the condenser. By means of nozzles, water is sprayed onto the humid air flowing through the air duct in the water-cooled condenser. The air getting in contact with the cooling water leaves its moisture, cools down to some extent and is directed to the suction channel of the fan. The cooled air is passed over the heat in the air duct by means of the fan to be reheated and then directed to the drum. The cooling water sprayed in the condenser and the water condensed from the air is discharged by means of the pump under the air duct. The energy consumption of the conventional laundry dryers comprising a water-cooled condenser and a heater is higher than that of the heat pump dryers.
  • The Patent Application No. CN101805974 (A) relates to a laundry washer-dryer with improved dehumidification efficiency.
  • The Patent Application No. KR20020090872 (A) relates to a laundry washer-dryer comprising a water-cooled condenser. In the condenser, the water-air contact area and heat transfer performance are increased with different designs.
  • The aim of the present invention is the realization of a laundry dryer comprising a water-cooled condenser and wherein the dehumidification capacity can be changed according to the drying speed.
  • The laundry dryer realized in order to attain the aim of the present invention comprises a water-cooled condenser which is disposed in the air circulation duct and which dehumidifies the process air. A temperature sensor is provided in the air circulation filter region while a humidity sensor is provided in the drum. A variable flow valve for delivering condensation water into the condenser at different flow rates is connected to the water supply line which provides the spraying of cold water to the condenser for condensing the process air. Depending on the data received from the temperature sensor and/or the humidity sensor, the control unit, during the drying process, changes the flow rate of the cold water delivered into the condenser by the variable flow valve such that the process air temperature is kept around a predetermined set temperature.
  • The laundry dryer realized in order to attain the aim of the present invention is illustrated in the attached figure, where:
  • Figure 1 - is the schematic view of a laundry dryer comprising a water-cooled condenser.
  • The elements illustrated in the figures are numbered as follows:
    1. Laundry dryer
    2. Drum
    3. Air circulation duct
    4. Fan
    5. Heater
    6. Condenser
    7. Water mains
    8. Water supply line
    9. Nozzle
    10. Filter
    11. Temperature sensor
    12. Humidity sensor
    13. Variable flow valve
    14. Control unit
  • The laundry dryer (1) comprises a drum (2) wherein the laundry to be dried is loaded; an air circulation duct (3) which enables the process air to be passed over the laundry in the drum (2); a fan (4) which is disposed in the air circulation duct (3) and which provides the process air cycle; a resistance heater (5) which is disposed in the air circulation duct (3) at the inlet of the drum (2) and which heats the process air; a water-cooled condenser (6) which is disposed in the air circulation duct (3) and which dehumidifies the process air; a water supply line (8) which enables the cooling water (condensation water) to be taken into the condenser (6) from the water mains (7); at least one nozzle (9) which extends from the water supply line (8) into the condenser (6) and which sprays cold water onto the humid air coming from the air circulation duct (3) into the condenser (6); a temperature sensor (11), for example an NTC (Negative Temperature Coefficient) thermistor, which is disposed at the filter (10) region of the air circulation duct (3) at the inlet of the condenser (6) and which detects the temperature of the process air dehumidifying the laundry and entering the condenser (6) to be condensed; and a humidity sensor (12) which is disposed in the drum (2) and which measures the humidity of the process air so as to detect the dryness status of the laundry and the drying speed.
  • The laundry dryer (1) of the present invention comprises
  • - a variable flow valve (13) which is connected to the water supply line (8) at the outlet of the water mains (7) and which delivers condensation water into the condenser (6) at different flow rates, and
  • - a control unit (14) which, during the drying process, changes the flow rate of the cold water delivered into the condenser (6) by the variable flow valve (13) such that the process air temperature is kept around a predetermined set temperature (T-set) depending on the data received from the temperature sensor (11) and/or the humidity sensor (12).
  • If the process air temperature is below the set temperature (T-set), the control unit (14) decreases the flow rate of the cooling water delivered from the variable flow valve (13) into the condenser (6), thus increasing the process air temperature.
  • If the process air temperature is above the set temperature (T-set), the control unit (14) increases the flow rate of the cooling water delivered from the variable flow valve (13) into the condenser (6), thus decreasing the process air temperature.
  • If the dehumidification (drying) speed of the process air is below a predetermined threshold value, the control unit (14) decides that the process air temperature is below the set temperature (T-set), and decreases the flow rate of the cooling water delivered from the variable flow valve (13) into the condenser (6), thus increasing the process air temperature.
  • If the dehumidification (drying) speed of the process air is above a predetermined threshold value, the control unit (14) decides that the process air temperature is above the set temperature (T-set), and increases the flow rate of the cooling water delivered from the variable flow valve (13) into the condenser (6), thus decreasing the process air temperature.
  • In the laundry dryer (1), the process air passes through the filter (10) and the condenser (6) after leaving the drum (2). While passing through the condenser (6), the process air circulated in the air circulation duct (3) by the fan (4) is condensed by means of the cold water coming from the water supply line (8) and sprayed by the nozzles (9), and then the condensate is discharged. After leaving the condenser (6), the process air is passed over the heater (5) at the drum (2) inlet part of the air circulation duct (3), and hot dry process air is sent onto the laundry. The heater (5) is operated in an on-off manner continuously or intermittently depending on the process air temperature measured by the temperature sensor. At the start of the drying process, the heater (5) is operated at high power until the process air temperature reaches the predetermined set temperature (T-set) (approximately 75oC). The power of the heater (5) is decreased once the set temperature (T-set) is reached. The heater (5) is operated in an on-off manner such that the process air temperature oscillates around the set temperature (T-set). Depending on the data received from the temperature sensor (11) and the humidity sensor (12), the control unit (14) decides whether the process air temperature is below or above the set temperature (T-set). If the process air temperature is low, the control unit (14) decreases the flow rate of the cooling water delivered from the variable flow valve (13) into the condenser (6), and increases the process air temperature close to the set temperature (T-set). If the process air temperature is high, the control unit (14) increases the flow rate of the cooling water delivered from the variable flow valve (13) into the condenser (6), and decreases the process air temperature close to the set temperature (T-set). By means of the variable flow valve (13), varying amounts of water are sprayed into the condenser (6), thus the process air temperature is kept around the set temperature (T-set) during the drying process, enabling the humidity in the fabric to be more quickly evaporated. Depending on the data received from the temperature sensor (11) and the humidity sensor (12), the control unit adjusts the amount of water delivered by the variable flow valve (13) to the condenser (6). By keeping the process air temperature constant, the dehumidification performance is improved, the laundry is prevented from overdrying and from getting damaged while the drying time and hence the energy consumption is decreased.

Claims (5)

  1. A laundry dryer (1) comprising a drum (2) wherein the laundry to be dried is loaded; an air circulation duct (3) which enables the process air to be passed over the laundry in the drum (2); a fan (4) which is disposed in the air circulation duct (3) and which moves the process air; a resistance heater (5) which is disposed in the air circulation duct (3) at the inlet of the drum (2); a water-cooled condenser (6) which is disposed in the air circulation duct (3); a water supply line (8) which enables the cooling water to be taken into the condenser (6) from the water mains (7); at least one nozzle (9) which extends into the condenser (6) and which sprays cold water onto the humid air; a temperature sensor (11) which is disposed at the filter (10) region of the air circulation duct (3) at the inlet of the condenser (6) and which detects the process air temperature; and a humidity sensor (12) which is disposed in the drum (2) and which measures the humidity of the process air, characterized by
    - a variable flow valve (13) which is connected to the water supply line (8) at the outlet of the water mains (7) and which delivers condensation water into the condenser (6) at different flow rates, and
    - a control unit (14) which changes the flow rate of the cold water delivered into the condenser (6) by the variable flow valve (13) such that the process air temperature is kept around a predetermined set temperature (T-set) depending on the data received from the temperature sensor (11) and/or the humidity sensor (12).
  2. A laundry dryer (1) as in Claim 1, characterized by the control unit (14) which decreases the flow rate of the cooling water delivered from the variable flow valve (13) into the condenser (6), thus increasing the process air temperature if the process air temperature is below the set temperature (T-set).
  3. A laundry dryer (1) as in Claim 1, characterized by the control unit (14) which increases the flow rate of the cooling water delivered from the variable flow valve (13) into the condenser (6), thus decreasing the process air temperature if the process air temperature is above the set temperature (T-set).
  4. A laundry dryer (1) as in Claim 1, characterized by the control unit (14) which decides, if the dehumidification speed of the process air is below a predetermined threshold value, that the process air temperature is below the set temperature (T-set), and which decreases the flow rate of the cooling water delivered from the variable flow valve (13) into the condenser (6), thus increasing the process air temperature.
  5. A laundry dryer (1) as in Claim 1, characterized by the control unit (14) which decides, if the dehumidification speed of the process air is above a predetermined threshold value, that the process air temperature is above the set temperature (T-set), and which increases the flow rate of the cooling water delivered from the variable flow valve (13) into the condenser (6), thus decreasing the process air temperature.
EP19797716.8A 2018-11-28 2019-11-01 A laundry dryer with a water-cooled condenser Active EP3887592B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201818083 2018-11-28
PCT/EP2019/079975 WO2020108918A1 (en) 2018-11-28 2019-11-01 A laundry dryer with a water-cooled condenser

Publications (2)

Publication Number Publication Date
EP3887592A1 true EP3887592A1 (en) 2021-10-06
EP3887592B1 EP3887592B1 (en) 2023-07-12

Family

ID=68426507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19797716.8A Active EP3887592B1 (en) 2018-11-28 2019-11-01 A laundry dryer with a water-cooled condenser

Country Status (2)

Country Link
EP (1) EP3887592B1 (en)
WO (1) WO2020108918A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US12435456B2 (en) 2022-01-25 2025-10-07 Samsung Electronics Co., Ltd. Washing machine with drying function

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KR102862653B1 (en) * 2019-10-25 2025-09-23 삼성전자주식회사 Dryer and controlling method thereof
CN113265861B (en) * 2021-05-17 2026-02-10 青岛海尔洗衣机有限公司 A garment processing device and its control method
CN113279201A (en) * 2021-05-20 2021-08-20 长虹美菱股份有限公司 Drying control method of drum washing machine capable of reducing water and electricity consumption
CN113832686B (en) * 2021-10-22 2022-11-25 珠海格力电器股份有限公司 Drying control method and device for clothes treatment equipment, medium and equipment
CN114775248B (en) * 2022-04-29 2023-08-01 珠海格力电器股份有限公司 Clothes care device and control method thereof
US20230363616A1 (en) * 2022-05-13 2023-11-16 Haier Us Appliance Solutions, Inc. Dishwashing appliance having an air-drying dehumidification assembly
CN114753130B (en) * 2022-05-16 2023-08-29 珠海格力电器股份有限公司 Drying equipment and its control method
CN120042046B (en) * 2025-01-23 2026-01-23 珠海格力电器股份有限公司 Clothing processing equipment, control devices, and drying methods with drying functions

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TW593829B (en) 2001-05-23 2004-06-21 Hitachi Ltd Washing and drying machine and water-cooled heat exchanger
JP2004159859A (en) * 2002-11-12 2004-06-10 Sharp Corp Clothes dryer
JP2009240737A (en) * 2008-04-01 2009-10-22 Toshiba Corp Cloth drier
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TR201106336A1 (en) * 2011-06-27 2013-01-21 Ar�El�K Anon�M ��Rket� A washing and drying machine with air-cooled condenser.
EP2746455A1 (en) * 2012-12-20 2014-06-25 BSH Bosch und Siemens Hausgeräte GmbH Process for operating a washer dryer with a heat pump, and a suitable washer dryer
CN105483995A (en) * 2014-09-18 2016-04-13 博西华电器（江苏）有限公司 Drying method of dyer and dryer using same

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US12435456B2 (en) 2022-01-25 2025-10-07 Samsung Electronics Co., Ltd. Washing machine with drying function

Also Published As

Publication number Publication date
WO2020108918A1 (en) 2020-06-04
EP3887592B1 (en) 2023-07-12

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