WO2018059979A1 - A laundry dryer with a heat pump and the control method thereof - Google Patents

A laundry dryer with a heat pump and the control method thereof Download PDF

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Publication number
WO2018059979A1
WO2018059979A1 PCT/EP2017/073414 EP2017073414W WO2018059979A1 WO 2018059979 A1 WO2018059979 A1 WO 2018059979A1 EP 2017073414 W EP2017073414 W EP 2017073414W WO 2018059979 A1 WO2018059979 A1 WO 2018059979A1
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WO
WIPO (PCT)
Prior art keywords
ambient
temperature
limit
laundry dryer
rotation
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.)
Ceased
Application number
PCT/EP2017/073414
Other languages
French (fr)
Inventor
Bora Abdik
Selcuk KARAGOZ
Erdem Kara
Umut GUVEN
Olcay KAPSIZ
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Arcelik AS
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Arcelik AS
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Filing date
Publication date
Application filed by Arcelik AS filed Critical Arcelik AS
Publication of WO2018059979A1 publication Critical patent/WO2018059979A1/en
Anticipated expiration legal-status Critical
Ceased 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
    • D06F58/32—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
    • 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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/32—Temperature
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/34—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
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/36—Flow or velocity
    • 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
    • D06F2103/44—Current or voltage
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/16—Air properties
    • D06F2105/24—Flow or velocity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/52—Changing sequence of operational steps; Carrying out additional operational steps; Modifying operational steps, e.g. by extending duration of steps
    • 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 with heat pump and its control method.
  • the heat pump system used to dry the laundry consists of a compressor enabling circulation of a refrigerant by pressurizing it, an evaporator and a condenser; drying process being performed by passing the process air through the laundry.
  • the process air heats while passing through the condenser, is sent over the laundry as heated, absorbs the humidity of the laundry and then release the humidity while passing through the evaporator.
  • the motor actuating the drum in which the laundry is placed also rotates the process air fan.
  • the motor actuating the drum is stopped in predetermined periods and is operated in reverse direction, and then is stopped again and is operated in right direction with the purpose of drying the laundry homogeneously.
  • the process fan In the periods when the motor is stopped and rotated in the reverse direction, the process fan is also stopped and rotated in the reverse direction, and the process air flow is interrupted.
  • the compressor temperature increases excessively during the period in which the air flow is interrupted.
  • the compressor is protected against high currents and temperatures by a thermal (thermic) shield, but rapid increase of the temperature during said stopping and reverse rotation periods causes the thermal shield to cut the current feeding the compressor as open circuit, ending the drying cycle before completion.
  • the aim of the present invention is to realize a laundry dryer and a control method thereof, in which excessive heating of the compressor is prevented.
  • the motor driving the drum is operated according to a predetermined algorithm of right direction rotation/stopping/reverse direction rotation.
  • the motor driving the drum also rotates the process air fan.
  • ambient heat is detected by the temperature sensors placed in the body, and the control unit calculates a mean ambient temperature according to the data received from the temperature sensors.
  • the control unit compares the mean outer environment temperature to a limit ambient temperature presaved to its memory. If the calculated ambient temperature is higher than the limit value, then the duration of rotation in the right direction of the motor driving the drum and the process air fan is prolonged, and the durations of stopping and rotation in the reverse direction is shortened.
  • the thermal shield is prevented from cutting the current feeding the compressor and ending the drying process before completion, by avoiding excessive heating of the heat pump system and particularly the compressor.
  • Figure 1 is a schematic view of the laundry dryer with heat pump.
  • Figure 2 is a diagram showing the variation of the rotation motion of the motor with respect to time in the laundry dryer with heat pump.
  • Figure 3 is a flow diagram of the control method applied in the laundry dryer with heat pump.
  • T-limit Limit ambient temperature
  • the laundry dryer (1) comprises a body (2), a drum (3) in which the laundry to be dried is placed, an air duct (4) through which the process air (drying air) is circulated, a process air fan (5) ( “fan (5) for short) circulating the process air in the air duct (4), an motor (6) driving the drum (3) and the fan (5) simultaneously, and a heat pump system (12) comprising a compressor (7) executing the refrigerant cycle, a thermal shield (8) (also called “thermic” ) protecting the compressor (7) against high temperatures and electric current, an evaporator (9) enabling dehumidification of the process air, a condenser (10) enabling heating of the dehumidified process air, and an expansion member (11) such as a capillary tube or an expansion valve enabling expansion of the refrigerant leaving the condenser (10), and refrigerant flow tubes enabling the refrigerant pressurized by and the compressor (7), to return to the compressor (7) by passing through the condenser (10),
  • the laundry dryer (1) of the invention comprises at least one temperature sensor (13) placed in the body (2), enabling the measuring of the ambient air (the ambient air in which the laundry dryer (1) operates) temperature (T-ambient) directly or indirectly, and a control unit (14) determining the rotation algorithm (profile) of the motor (6) and the fan (5) during the drying cycle according to data received from the temperature sensors (13), enabling modification of:
  • the control unit (14) enables prolonging the rotation durations in the right direction (A) of the motor (6) and the fan (5), and shortening the stopping durations (B) of the motor (6) and the fan (5) and shortening the rotation durations in the reverse direction (C) of the motor (6) and the fan (5) upon the ambient temperature (T-ambient) measured by the temperature sensors (13) being higher than a limit ambient temperature (T-limit) (T-ambient > T-limit) predetermined and presaved to its memory.
  • the temperature of the compressor (7) is affected from the load situation as well as especially the ambient temperature.
  • the control unit (14) particularly decreases the rotation durations of the motor (6) and the fan (5) in the reverse direction (B) and the stopping durations (C) causing the compressor (7) to heat up excessively, and thus the periods are decreased in which process air flow is not present or is insufficient.
  • the rotation durations of the motor (6) and the fan (5) in the right direction are increased, thereby increasing the periods in which effective process air flow is applied.
  • the ratio of the periods in which the process air flow is interrupted to the total duration of the drying cycle is reduced by increasing the ratio of the periods in which process air flow is applied to the total duration of the drying cycle.
  • excessive increase of heat of the heat pump system (12) consisting of particularly the compressor (7), refrigerant flow tubes, condenser (10) and evaporator (10), as well as cutting the current feeding the compressor (7) by the thermal shield (8) as open circuit and thereby ending the drying cycle before completion, are prevented.
  • the control unit (14) evaluates the ambient temperatures (T-ambient) measured by the temperature sensors (13) at the beginning of the drying process performed in the laundry dryer (1), i.e. when the laundry dryer (1) is initially started. Since the heat pump system (12) is recently activated in the beginning of the drying cycle, the refrigerant temperature has not yet increased and therefore the temperatures measured in the body (2) are almost equal to the outer environment air temperatures as the heat pump system (12) has not yet heated up. The measurements of the temperature sensors (13) are used directly as temperature data.
  • a predetermined number of temperature measurements for a predetermined duration are taken by the temperature sensors (13) at the beginning of the drying cycle, and the control unit (14) calculates the arithmetic mean of the measured ambient temperatures (T-ambient) and compares this to the limit temperature (T-limit).
  • the laundry dryer (1) comprises at least one temperature sensor (13) placed in the air duct (4).
  • the laundry dryer (1) comprises at least one temperature sensor (13) placed in the proximity of the compressor (7).
  • control method applied by the control unit (4) in the laundry dryer (1) of the invention comprises the steps of:
  • the temperature of the environment (T-ambient) where the laundry dryer (1) is located is measured by the temperature sensors (13) provided in the body (2).
  • the control unit (14) modifies during the drying cycle the rotation durations in the right direction (A), the stopping durations (B), and the rotation durations in the reverse direction (B) determining the rotation profile of the motor (6) and therefore of the process air fan (5) by evaluating the data received from the temperature sensors (13).
  • excessive heating of the heat pump system (12) based on the ambient temperature, and ending the drying cycle through open circuit by the thermal shield (8) protecting the compressor (7) against high temperatures and currents, are prevented.

Landscapes

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

Abstract

The present invention relates to a laundry dryer (1) comprising a body (2), a drum (3) in which the laundry to be dried are placed, an air duct (4) through which the process air is circulated, a fan (6) circulating the process air in the air duct (4), an motor (6) driving the drum (3) and the fan (5) simultaneously, and a heat pump system (12) having a compressor (7) circulating the refrigerant, a thermal shield (8) protecting the compressor (7) against high temperatures and electric current, an evaporator (9) enabling dehumidification of the process air, and a condenser (10) enabling heating of the dehumidified process air, and the control method thereof.

Description

A LAUNDRY DRYER WITH A HEAT PUMP AND THE CONTROL METHOD THEREOF
The present invention relates to a laundry dryer with heat pump and its control method.
In laundry dryers with heat pump, the heat pump system used to dry the laundry consists of a compressor enabling circulation of a refrigerant by pressurizing it, an evaporator and a condenser; drying process being performed by passing the process air through the laundry. The process air heats while passing through the condenser, is sent over the laundry as heated, absorbs the humidity of the laundry and then release the humidity while passing through the evaporator.
In many applications with laundry dryers with heat pump, the motor actuating the drum in which the laundry is placed, also rotates the process air fan. During the drying cycle, the motor actuating the drum is stopped in predetermined periods and is operated in reverse direction, and then is stopped again and is operated in right direction with the purpose of drying the laundry homogeneously.
In the periods when the motor is stopped and rotated in the reverse direction, the process fan is also stopped and rotated in the reverse direction, and the process air flow is interrupted. The compressor temperature increases excessively during the period in which the air flow is interrupted. The compressor is protected against high currents and temperatures by a thermal (thermic) shield, but rapid increase of the temperature during said stopping and reverse rotation periods causes the thermal shield to cut the current feeding the compressor as open circuit, ending the drying cycle before completion.
State of the art international patent application no. WO2012020943 (A2) relates to a laundry dryer with heat pump in which the excessive heating of the compressor is prevented and the drying duration is shortened.
The aim of the present invention is to realize a laundry dryer and a control method thereof, in which excessive heating of the compressor is prevented.
In the laundry dryer with heat pump and the control method thereof realized to achieve the aim of the present invention, the motor driving the drum is operated according to a predetermined algorithm of right direction rotation/stopping/reverse direction rotation. The motor driving the drum also rotates the process air fan. In the embodiment of the invention, ambient heat is detected by the temperature sensors placed in the body, and the control unit calculates a mean ambient temperature according to the data received from the temperature sensors. The control unit compares the mean outer environment temperature to a limit ambient temperature presaved to its memory. If the calculated ambient temperature is higher than the limit value, then the duration of rotation in the right direction of the motor driving the drum and the process air fan is prolonged, and the durations of stopping and rotation in the reverse direction is shortened. Thus, the periods in which process air flow is effectively applied is increased and the periods in which air flow is interrupted is decreased. The thermal shield is prevented from cutting the current feeding the compressor and ending the drying process before completion, by avoiding excessive heating of the heat pump system and particularly the compressor.
The laundry dryer with heat pump and the control method thereof realized to achieve the aims of the present invention is illustrated in the accompanying drawings, wherein:
Figure 1 is a schematic view of the laundry dryer with heat pump.
Figure 2 is a diagram showing the variation of the rotation motion of the motor with respect to time in the laundry dryer with heat pump.
Figure 3 is a flow diagram of the control method applied in the laundry dryer with heat pump.
The elements in the figures are numbered individually and the correspondence of these numbers are given hereinafter.
  1. Laundry dryer
  2. Body
  3. Drum
  4. Air duct
  5. Fan
  6. Motor
  7. Compressor
  8. Thermal shield
  9. Evaporator
  10. Condenser
  11. Expansion member
  12. Heat pump system
  13. Temperature sensor
  14. Control unit
T-ambient: Measured ambient temperature
T-limit: Limit ambient temperature
A: Rotation duration of the motor in the right direction
B: Stopping duration of the motor
C: Rotation duration of the motor in the reverse direction
cw: Clockwise rotation
ccw: Counter clockwise rotation
t: time
The laundry dryer (1) comprises a body (2), a drum (3) in which the laundry to be dried is placed, an air duct (4) through which the process air (drying air) is circulated, a process air fan (5) ( “fan (5) for short) circulating the process air in the air duct (4), an motor (6) driving the drum (3) and the fan (5) simultaneously, and a heat pump system (12) comprising a compressor (7) executing the refrigerant cycle, a thermal shield (8) (also called “thermic” ) protecting the compressor (7) against high temperatures and electric current, an evaporator (9) enabling dehumidification of the process air, a condenser (10) enabling heating of the dehumidified process air, and an expansion member (11) such as a capillary tube or an expansion valve enabling expansion of the refrigerant leaving the condenser (10), and refrigerant flow tubes enabling the refrigerant pressurized by and the compressor (7), to return to the compressor (7) by passing through the condenser (10), expansion member (11) and the evaporator (9).
The laundry dryer (1) of the invention comprises at least one temperature sensor (13) placed in the body (2), enabling the measuring of the ambient air (the ambient air in which the laundry dryer (1) operates) temperature (T-ambient) directly or indirectly, and a control unit (14) determining the rotation algorithm (profile) of the motor (6) and the fan (5) during the drying cycle according to data received from the temperature sensors (13), enabling modification of:
- rotation durations in the right direction (A) (predetermined rotation durations applied during most of the duration of the drying cycle in the clockwise (cw) direction or in counter clockwise (ccw) direction accepted as “right” direction),
- stopping durations (B), and
- rotation durations in the reverse rotation direction with respect to the right rotation direction (C).
The control unit (14) enables prolonging the rotation durations in the right direction (A) of the motor (6) and the fan (5), and shortening the stopping durations (B) of the motor (6) and the fan (5) and shortening the rotation durations in the reverse direction (C) of the motor (6) and the fan (5) upon the ambient temperature (T-ambient) measured by the temperature sensors (13) being higher than a limit ambient temperature (T-limit) (T-ambient > T-limit) predetermined and presaved to its memory.
In the laundry dryer (1) with heat pump, the temperature of the compressor (7) is affected from the load situation as well as especially the ambient temperature. Upon the ambient temperature exceeding a certain limit value, the control unit (14) particularly decreases the rotation durations of the motor (6) and the fan (5) in the reverse direction (B) and the stopping durations (C) causing the compressor (7) to heat up excessively, and thus the periods are decreased in which process air flow is not present or is insufficient. In turn, the rotation durations of the motor (6) and the fan (5) in the right direction are increased, thereby increasing the periods in which effective process air flow is applied. The ratio of the periods in which the process air flow is interrupted to the total duration of the drying cycle is reduced by increasing the ratio of the periods in which process air flow is applied to the total duration of the drying cycle. Thus, excessive increase of heat of the heat pump system (12) consisting of particularly the compressor (7), refrigerant flow tubes, condenser (10) and evaporator (10), as well as cutting the current feeding the compressor (7) by the thermal shield (8) as open circuit and thereby ending the drying cycle before completion, are prevented.
In an embodiment of the invention, the control unit (14) evaluates the ambient temperatures (T-ambient) measured by the temperature sensors (13) at the beginning of the drying process performed in the laundry dryer (1), i.e. when the laundry dryer (1) is initially started. Since the heat pump system (12) is recently activated in the beginning of the drying cycle, the refrigerant temperature has not yet increased and therefore the temperatures measured in the body (2) are almost equal to the outer environment air temperatures as the heat pump system (12) has not yet heated up. The measurements of the temperature sensors (13) are used directly as temperature data.
In another embodiment of the invention, a predetermined number of temperature measurements for a predetermined duration are taken by the temperature sensors (13) at the beginning of the drying cycle, and the control unit (14) calculates the arithmetic mean of the measured ambient temperatures (T-ambient) and compares this to the limit temperature (T-limit).
In another embodiment of the invention, the laundry dryer (1) comprises at least one temperature sensor (13) placed in the air duct (4).
In another embodiment of the invention, the laundry dryer (1) comprises at least one temperature sensor (13) placed in the proximity of the compressor (7).
The control method applied by the control unit (4) in the laundry dryer (1) of the invention, comprises the steps of:
- taking by the temperature sensors (13) a predetermined number of measurements for a predetermined duration at the beginning of the drying process (100);
- calculating by the control unit (14) the arithmetic mean of all temperature data and determining a single ambient temperature (T-ambient) (101);
- comparing the calculated ambient temperature (T-ambient) with the limit ambiance temperature (T-limit) (102);
- prolonging the rotation duration in the right direction (A), and shortening the stopping duration (B) and rotation duration in the reverse direction (C) of the motor (6) upon the calculated ambient temperature (T-ambient) being higher than the limit ambient temperature (T-limit) (103); of normal conditions without modifying the rotation durations in the right direction (A), stopping durations (B), and the rotation durations in the reverse direction (C) of the motor (6), upon the calculated ambient temperature (T-ambient) being lower than the limit ambient temperature (T-limit) (104).
In the embodiment of the invention, the temperature of the environment (T-ambient) where the laundry dryer (1) is located, is measured by the temperature sensors (13) provided in the body (2). The control unit (14) modifies during the drying cycle the rotation durations in the right direction (A), the stopping durations (B), and the rotation durations in the reverse direction (B) determining the rotation profile of the motor (6) and therefore of the process air fan (5) by evaluating the data received from the temperature sensors (13). Thus, excessive heating of the heat pump system (12) based on the ambient temperature, and ending the drying cycle through open circuit by the thermal shield (8) protecting the compressor (7) against high temperatures and currents, are prevented.

Claims (7)

  1. A laundry dryer (1) comprising a body (2), a drum (3) in which the laundry to be dried is placed, an air duct (4) through which the process air is circulated, a fan (5) circulating the process air in the air duct (4), an motormotor (6) driving the drum (3) and the fan (5) simultaneously, and a heat pump system (12) having a compressor (7) circulating the refrigerant, an evaporator (9) enabling dehumidification of the process air, and a condenser (10) enabling heating of the dehumidified process air, characterized by at least one temperature sensor (13) placed in the body (2), enabling the measuring of the ambient air temperature (T-ambient), and a control unit (14) enabling modification of rotation durations in the right direction (A), stopping durations (B), and rotation durations in the reverse direction (C) of the motor (6) and the fan (5) according to data received from the temperature sensors (13).
  2. A laundry dryer (1) according to claim 1 characterized by the control unit (14) prolonging the rotation durations in the right direction (A), and shortening the stopping durations (B) and rotation durations in the reverse direction (C) of the motor (6) and the fan (5) upon the ambient temperature (T-ambient) measured by the temperature sensors (13) being higher than a limit ambient temperature (T-limit) predetermined and presaved to its memory.
  3. A laundry dryer (1) according to claim 1 or 2 characterized by the control unit (14) evaluating the ambient temperatures (T-ambient) measured by the temperature sensors (13) in the beginning of the drying process performed in the laundry dryer (1).
  4. A laundry dryer (1) according to claim 1 or 2 characterized by the temperature sensors (13) taking a predetermined number of temperature measurements for a predetermined duration and the control unit (14) calculating the arithmetic mean of the measured ambient temperatures (T-ambient) and comparing this to the limit temperature (T-limit).
  5. A laundry dryer (1) according to claim 1 characterized by at least one temperature sensor (13) placed in the air duct (4).
  6. A laundry dryer (1) according to claim 1 or 5, characterized by at least one temperature sensor (13) placed in the proximity of the compressor (7).
  7. A control method applied in a laundry dryer (1), comprising the steps of:
    - taking by the temperature sensors (13) a predetermined number of measurements for a predetermined duration at the beginning of the drying process (100);
    - calculating by the control unit (14) the arithmetic mean of all temperature data and determining a single ambient temperature (T-ambient) (101);
    - comparing the calculated ambient temperature (T-ambient) with the limit ambiance temperature (T-limit) (102);
    - prolonging the rotation duration in the right direction (A), and shortening the stopping duration (B) and rotation duration in the reverse direction (C) of the motor (6) upon the calculated ambient temperature (T-ambient) being higher than the limit ambient temperature (T-limit) (103);
    - applying the motor (6) predetermined rotation algorithm of normal conditions upon the calculated ambient temperature (T-ambient) being lower than the limit ambient temperature (T-limit) (104).
PCT/EP2017/073414 2016-09-30 2017-09-18 A laundry dryer with a heat pump and the control method thereof Ceased WO2018059979A1 (en)

Applications Claiming Priority (2)

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TR2016/13670A TR201613670A2 (en) 2016-09-30 2016-09-30
TRA2016/13670 2016-09-30

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Publication number Priority date Publication date Assignee Title
CN113293585B (en) * 2020-02-21 2024-08-23 青岛胶南海尔洗衣机有限公司 Control method of auxiliary cooling device of heat pump system and heat pump drying equipment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070251119A1 (en) * 2006-04-17 2007-11-01 Lg Electronics Inc. Dryer and control method thereof
WO2012020943A2 (en) 2010-08-09 2012-02-16 Lg Electronics Inc. Clothes dryer
WO2012134148A2 (en) * 2011-03-29 2012-10-04 Lg Electronics Inc. Controlling method for clothes dryer
EP3031978A1 (en) * 2014-12-09 2016-06-15 LG Electronics Inc. Dryer and control method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070251119A1 (en) * 2006-04-17 2007-11-01 Lg Electronics Inc. Dryer and control method thereof
WO2012020943A2 (en) 2010-08-09 2012-02-16 Lg Electronics Inc. Clothes dryer
WO2012134148A2 (en) * 2011-03-29 2012-10-04 Lg Electronics Inc. Controlling method for clothes dryer
EP3031978A1 (en) * 2014-12-09 2016-06-15 LG Electronics Inc. Dryer and control method thereof

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