EP2733253A1 - Verfahren für den Betrieb eines Wäschetrockners mit Wärmepumpe und Wäschetrockner mit Wärmepumpe oder Waschmaschine mit Wärmepumpe mit Trocknungsfunktion - Google Patents

Verfahren für den Betrieb eines Wäschetrockners mit Wärmepumpe und Wäschetrockner mit Wärmepumpe oder Waschmaschine mit Wärmepumpe mit Trocknungsfunktion Download PDF

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Publication number
EP2733253A1
EP2733253A1 EP12192939.2A EP12192939A EP2733253A1 EP 2733253 A1 EP2733253 A1 EP 2733253A1 EP 12192939 A EP12192939 A EP 12192939A EP 2733253 A1 EP2733253 A1 EP 2733253A1
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EP
European Patent Office
Prior art keywords
laundry
fan unit
heat pump
input variable
cycle
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Withdrawn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
EP12192939.2A
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English (en)
French (fr)
Inventor
Michele Bisaro
Roberto Ragogna
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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 EP12192939.2A priority Critical patent/EP2733253A1/de
Priority to AU2013346941A priority patent/AU2013346941B2/en
Priority to EP13789796.3A priority patent/EP2920354B1/de
Priority to CN201380070535.XA priority patent/CN104919109B/zh
Priority to PCT/EP2013/073643 priority patent/WO2014076093A1/en
Publication of EP2733253A1 publication Critical patent/EP2733253A1/de
Withdrawn legal-status Critical Current

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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
    • D06F58/32—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
    • D06F2101/00—User input for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • 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
    • D06F2101/00—User input for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2101/02—Characteristics of laundry or load
    • D06F2101/04—Quantity, e.g. weight
    • 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
    • D06F2101/00—User input for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2101/02—Characteristics of laundry or load
    • D06F2101/06—Type or material
    • 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
    • D06F2101/00—User input for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2101/14—Time settings
    • 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
    • D06F2101/00—User input for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2101/16—Target humidity for the drying process, e.g. very-dry cycles
    • 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
    • D06F2103/24—Spin speed; Drum movements
    • 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
    • D06F2103/46—Current or voltage of the motor driving the drum
    • 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
    • D06F2103/50—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to heat pumps, e.g. pressure or flow rate
    • 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
    • D06F2103/54—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to blowers or fans
    • 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
    • D06F2105/52—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
    • D06F25/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and having further drying means, e.g. using hot air 
    • 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 invention relates to a method of operating a heat pump laundry dryer or washing machine having a cooling fan unit for cooling a compressor of the dryer and the invention relates to a heat pump laundry dryer or a heat pump washing machine having drying function.
  • EP 2 212 463 B1 discloses a household appliance for drying laundry.
  • a heat pump unit and means for cooling a component thereof are arranged in a housing of the appliance.
  • the means for cooling comprises a blower or fan which is adapted to convey cooling air from the outside of the appliance to the component.
  • a temperature sensor is disposed in the housing for generating a signal dependent from a temperature within the housing, wherein the temperature sensor may be arranged adjacent to a heat exchanger for condensing a refrigerant.
  • a control unit of the appliance is programmed to operated the blower in response to the signal.
  • a motor for driving the blower may have a fixed speed, wherein the control unit is adapted to operate the motor intermittently in response to the temperature signal.
  • a variable-speed motor is provided, wherein the control unit is adapted to operate the motor at varying speeds depending on the temperature signal.
  • a method of operating a laundry treatment apparatus comprising: a control unit controlling the operation of the laundry dryer or washing machine, a laundry treatment chamber (e.g. laundry drum) for treating laundry using process air and a process air circuit for circulating the process air.
  • a heat pump system having a refrigerant loop is provided in which the refrigerant fluid is circulated through a first heat exchanger (evaporator) and a second heat exchanger (condenser) by means of a compressor.
  • the compressor may have a fixed rotational speed or may be a variable speed compressor.
  • the treatment apparatus further comprises a cooling fan unit or blower unit for cooling the compressor.
  • the cooling fan unit comprises for example at least one fan and a motor for driving the at least one fan.
  • the cooling fan unit is adapted to cool the compressor during a drying operation, i.e. to remove excess heat from the heat pump system, to provide that the energy-efficient steady state or targeted operation state of the heat pump system is maintained during a drying operation (after a warm-up period at the beginning of a drying cycle).
  • the method of operating a heat pump laundry dryer or a heat pump washing machine having drying function as described above comprises: detecting or monitoring one or a plurality of input variables during a running (drying) program cycle, determining the end of a program sub-sequence by detecting or monitoring the one or the plurality of input variables, modifying or changing an operation parameter set for operating the cooling fan unit upon determining the end of the program sub-sequence.
  • a drying program or drying cycle comprises a plurality of sub-sequences, i.e. cycle steps or program steps, wherein the duration or end of a cycle step is determined in dependency of one or more input variables.
  • a cycle step may be terminated when a predetermined threshold value of an input variable is reached, e.g. a predetermined time is elapsed or a predetermined temperature of the heat pump system is reached.
  • a predetermined threshold value of an input variable e.g. a predetermined time is elapsed or a predetermined temperature of the heat pump system is reached.
  • the operation parameter settings of the fan unit i.e. the cooling power of the fan unit, is adjusted to requirements of each specific drying cycle step, such that the heat pump system operates at all times at best possible conditions. I.e. it is provided that as soon as the heat pump system operates in a steady or balanced state, this operation state is maintained, whereby the drying performance of the treatment apparatus is improved, in particular with respect to energy-efficiency.
  • an operation parameter set of the cooling fan unit may comprise one or more of the following operation parameters, in particular an arbitrary combination thereof: a fan rotation speed, i.e. a fan flow rate, an On/Off activation power duty ratio, e.g. controlled by driving a cooling fan motor through a PWM (pulse-width modulation) signal to control the fan speed, a threshold temperature above which the cooling fan unit is switched On and below which the fan unit is switched Off, and additionally or alternatively an On/Off time profile (e.g. duty ratio of operational ON/OFF periods), e.g. driving the fan not continuously but through a certain activation rhythm (e.g. 20 sec. ON, 5 sec. OFF).
  • a fan rotation speed i.e. a fan flow rate
  • an On/Off activation power duty ratio e.g. controlled by driving a cooling fan motor through a PWM (pulse-width modulation) signal to control the fan speed
  • a program cycle may be one of the following: a drying cycle, a laundry refreshment cycle, a laundry dry cleaning cycle, a laundry chemical processing cycle, a washing cycle, and an anti-wrinkle cycle.
  • the program cycle or each of the plurality of program cycles has a first sub-sequence and at least a second sub-sequence, wherein the first sub-sequence has a first operation parameter set for operating the cooling fan unit and the second sub-sequence has a second operation parameter set for operating the cooling fan unit, and wherein the first and second operation parameter sets are different from each other.
  • the method provides a plurality of operation parameter sets, wherein each operation parameter set is different from the other.
  • the plurality of operation parameter sets is provided, i.e. selected and applied, by the control unit which controls the operation of the fan unit.
  • the end of a program sub-sequence is determined in dependency of at least one of the following input variables: a user selectable input variable, a working parameter of the laundry drum, a working parameter of a process air fan, a working parameter of the heat pump system, a working parameter of an electric driving motor, a working parameter of the compressor, a working parameter of a liquid pump or condensate pump, a time parameter of a counter, a drying progress status parameter or a status parameter of the laundry to be dried, a status of a liquid or condensate level, an environment parameter of the treatment apparatus environment, and a machine alarm status parameter (e.g. overheat alarm, electric failure alarm etc.).
  • a machine alarm status parameter e.g. overheat alarm, electric failure alarm etc.
  • a working parameter of heat pump system may be for example a temperature of the refrigerant, in particular the refrigerant temperature at one of the heat exchangers, at the compressor outlet or at the condenser outlet.
  • the counter for determining a time parameter of a running program cycle may be implemented in the control unit.
  • the counter may be adapted to count time or determine elapsed time from the start of a program cycle, or from the start of a sub-sequence or from the time point of one of the other input parameters reaching or exceeding a predefined value, e.g. a predetermined refrigerant temperature, laundry humidity or process air temperature.
  • a drying progress status may include the temperature of process air for example at drum exit or a humidity value of the laundry to be dried for example detected by a humidity sensor of the treatment apparatus.
  • a user selected variable i.e. a user selection, may be for example a selected cycle, a selected cycle option or drying program type (e.g. fast-drying or night operation (silent and slow mode)), a residual laundry humidity, final humidity or drying level (e.g. extra-dry or iron-aid, i.e. higher residual laundry humidity), a laundry amount (e.g. input by user, detected by a weight sensor of the treatment apparatus (e.g. laundry dryer)), or estimated by an appropriate algorithm, a laundry type (e.g. cotton, wool etc.), and/or an energy-saving option or a drying process time-saving option (e.g. eco-mode, rapid).
  • a selected cycle e.g. fast-drying or night operation (silent and slow mode)
  • a residual laundry humidity, final humidity or drying level e.g. extra-dry or iron-aid, i.e. higher residual laundry humidity
  • a laundry amount e.g. input by user, detected by a weight sensor of the treatment
  • a working parameter of the laundry compartment or laundry drum may be a power consumption of a drum motor for driving the drum and/or a rotation speed of the drum motor.
  • a plurality of laundry parameters may be derived from the power consumption of the drum motor.
  • the laundry amount or load and its humidity or loss of humidity may be concluded/estimated from the detected power consumption of the drum motor.
  • the power consumption for rotating the laundry drum is higher than for a less weighing laundry load.
  • the drum motor has a lower power consumption when agitating the (less weighing) laundry.
  • a working parameter of the process air fan may be a fan rotation speed, a fan motor power consumption and/or a fan flow rate.
  • a working parameter of an electric driving motor for example a drum motor driving a laundry drum, a process air fan motor for driving process air through the process air circuit, may be the motor power supply and/or power consumption of the motor as described above, or the current, the voltage, the phase supplied to such motor, or a parameter calculated therefrom, such as the motor torque.
  • a working parameter of the compressor may be its power consumption, the compressor speed and/or a compressor motor status (e.g. On/Off).
  • An environment parameter of the treatment apparatus may be the detected ambient temperature and additionally or alternatively the humidity of ambient air outside the treatment apparatus.
  • An operation parameter set of the fan unit may be modified or changed in dependency of any one of the above described input variables or in dependency of an arbitrary combination of two or more of the input variables. I.e. an operation parameter set may be modified in dependency of each input variable independently from the other input variable(s).
  • the end of a sub-sequence is determined in response to the detected or monitored input variable exceeding, reaching or undershooting a predefined threshold, a predefined amount of change of the detected or monitored input variable, a predefined temporal gradient of the detected or monitored input variable, or an arbitrary combination thereof.
  • the specific cycle or program step end condition is determined and controlled by the control unit, such that the selected drying program may be closely adapted to requirements of a presently running program or cycle.
  • modifying or changing an operation parameter set for operating the cooling fan unit comprises changing from a first predetermined fan unit profile to a second predetermined fan unit profile, wherein the first fan unit profile is different from the second fan unit profile.
  • a first fan unit profile is executed in a (first) cycle step or sub-sequence of a running drying program cycle.
  • the cycle step is terminated as described above, e.g. because a predetermined threshold value is reached, i.e. a following (second) cycle step is started with a second fan unit profile different to the first.
  • an executed fan unit control profile may be a time behavior or time pattern, i.e. a profile over time, which is applied during the sub-sequence of the drying program until the monitored input variable reaches a predetermined sub-sequence end condition which terminates the sub-sequence.
  • the predetermined fan unit (time) profile includes one or more of the following: a predetermined fan unit speed or conveyance capacity profile (e.g. an individual speed profile over time), a predetermined fan unit On/Off-time profile (e.g. a predetermined activation profile over time like 20 sec. On / 5 sec. Off - either periodic or non-periodic), and a predetermined fan unit On/Off duty cycle ratio, i.e. the ratio between On-time and Off-time of the fan unit.
  • an operation parameter set of the cooling fan unit provides an operation profile for switching the fan On and Off over time, i.e. a fan unit On/Off profile.
  • detected input variables may be a working parameter of the treatment apparatus (e.g. drum motor speed, power consumption of the apparatus), a machine alarm or a (humidity) status of the laundry dried in the apparatus. If for example the power consumption of the treatment apparatus (i.e. the detected input variable) increases during a drying cycle above a predetermined threshold value the executed sub-sequence is terminated.
  • an operation profile for the fan unit is selected (i.e. applied) by the control unit which increases the cooling power or conveying capacity of the fan unit. For example by providing an operation profile having longer operating phases between non-operating phases of the fan unit, i.e. by increasing a duty cycle ratio of the fan unit.
  • At least one of the working parameters and the status parameters may be detected by an associated sensor dedicated to the working parameter or status parameter to be detected, wherein the sensor signal is processed by a sensor unit.
  • a sensor may be: a weight sensor for detecting a laundry amount or load, a temperature sensor for detecting a temperature of the treatment apparatus, in particular a starting temperature of the heat pump, a humidity sensor for detecting a laundry humidity in the laundry compartment.
  • the sensor unit may be implemented or partially implemented in or by the control unit of the treatment apparatus.
  • control unit is adapted to derive at least one of the above mentioned working parameters and status parameters by monitoring a sensor signal (or signals) and/or a component status over time.
  • a sensor signal or signals
  • the laundry load or loss of humidity may be derived from the power consumption of the drum motor.
  • Another example is deriving a laundry type by monitoring the progress of process air temperature and/or laundry humidity over time - possibly with knowledge of a laundry amount.
  • wool absorbs more liquid than synthetic fibers. I.e. when heating process air to remove moisture from a load of woolen articles more water has to be vaporized - in comparison to a load of synthetic fibers - such that the temperature of the process air does not rise as fast.
  • a look-up table is implemented in the control unit, wherein the look-up table provides for each program cycle and for each sub-sequence of the program cycle (i) a corresponding operation parameter set for operating the cooling fan unit, or (ii) a reference to a corresponding operation parameter set for operating the cooling fan unit.
  • a reference may be a location in a memory (of the control unit) where a corresponding operation parameter set is stored. Some of the operation parameter sets may be identical or the reference may point to the same memory location.
  • the method further comprises: changing an operation parameter set of the cooling fan unit in dependency of the detected end of a program sub-sequence, i.e. in dependency of at least one detected or monitored first input variable, as described above and additionally modifying or changing such a determined operation parameter set of the cooling fan unit in dependency of a second input variable, wherein the type of the second input variable is different of the type of the first input variable.
  • the humidity level and the drum motor speed of the laundry load are the detected first and second input variables.
  • a predefined humidity level (end condition) is reached during a sub-sequence, the sub-sequence is terminated and a predefined operation parameter set, e.g.
  • ON/Off temperature set is selected and applied to the fan unit for the following sub-sequence. Subsequently, i.e. during the executed sub-sequence or cycle step, the selected fan unit operation parameter set (ON/Off temperature set) is modified in dependency of the second input variable, e.g. the drum motor speed.
  • the drum motor speed (input variable), e.g. motor speed ⁇ 2000 rpm, is related to a specific On/Off temperature set (fan unit operation parameter set), defining at which temperature the fan unit is switched-on and switched-Off (e.g. 58°C /56°C).
  • the operation parameter settings of the fan unit may be individually adapted to the specific state or condition of a presently executed drying cycle (step).
  • the temperature may be detected at any place in the treatment apparatus, e.g. at the heat pump system or laundry drum.
  • control unit receives and processes the at least one input variable and is adapted to modify the operating parameter set of the cooling fan unit in response to the receiving and processing of the input variable.
  • the operating parameter set is changed only in response of a change in the input variable status or level. For example when the input variable changes from one predefined level range to another predefined level range (e.g. using thresholds for the variables).
  • the second input variable is at least one of the following input variables, which have been described in part above: a user selectable input variable, a machine alarm status parameter (e.g. overheat alarm, electric failure alarm etc.), a working parameter of the laundry drum, a working parameter of a process air fan, a working parameter of an electric driving motor, a working parameter of the compressor, a drying progress status parameter or a status parameter of the laundry to be dried, an environment parameter of the treatment apparatus environment, and a working parameter of the heat pump system.
  • a working parameter of heat pump system is for example a temperature of the refrigerant, in particular the refrigerant temperature at one of the heat exchangers, at the compressor outlet or at the condenser outlet.
  • the operation parameter set of the cooling unit may be changed in dependency of the second input variable being in a first predefined range or being above or below a first predefined threshold, wherein for a predefined second range of the first input variable the operation parameter set of the cooling unit may be changed in dependency of the second input variable being in a second predefined range or being above or below a second predefined threshold.
  • Table 1 A general example comprising first and second threshold values (Thresholds 1 and 2) is depicted in the following Table 1: Table 1: General example Input Range fan unit operation parameter set activated Input ⁇ Threshold 1 fan unit operation parameter set 1 Threshold 1 ⁇ Input ⁇ Threshold 2 fan unit operation parameter set 2 Input > Threshold 2 fan unit operation parameter set 3
  • Table 2 Specific example Drum motor speed (connected to fan unit) fan unit On/Off temperature Speed ⁇ 2000 rpm 58°C / 56°C 2000 rpm ⁇ speed ⁇ 2800 rpm 54°C / 53°C Speed > 2800 rpm 51°C / 50°C
  • the first input variable is the drum motor speed
  • the second input variable is a temperature of a heat pump system temperature or refrigerant temperature.
  • the applied fan unit On/Off temperature (in column 2) is selected in dependency of the drum motor speed (in column 1) - i.e. the higher the drum motor speed the lower the On/Off switching temperature to respond in time to a faster temperature rise of the compressor at higher drum motor speeds.
  • a look-up table e.g. like shown in the example of Table 2, is implemented in the control unit and the operation parameter set to be selected is retrieved from the look-up table in dependency of the respective value or value range of the input variable.
  • a further look-up table may be implemented in the control unit and the second input variable to be selected is retrieved from the further look-up table in dependency of the first input variable, wherein the first and second input variables govern the operation of the fan unit as described above and below.
  • the first input variable may be the drum motor speed as shown above, the process air blower speed or the drum rotation speed, wherein the second input variable is a threshold temperature or temperature range of a heat pump system temperature or refrigerant temperature.
  • the selection of the operation parameter set or the modification of the operation parameter set during a sub-sequence or cycle step may be made in dependency of a function in which the first input variable and the second input variable are used as function variables.
  • the drum motor speed is the first input variable and a temperature of e.g. the heat pump system is the second input variable, wherein the operation parameter set (switch-On / switch-Off temperature set) is set in dependency of the first input variable.
  • equations [1] and [2] provide a continuous adjustment of the fan unit switch-On / switch-Off temperature.
  • Table 3 Continuous adjustment of fan unit switch-On/-Off temperature in dependency of detected drum motor speed drum motor [rpm] fan unit switch-On temp. [°C] fan unit switch-Off temp. [°C] 2000 60 58 2100 59 57 2200 58 56 .... .... .... 2700 53 51 2800 52 50 2900 51 49 3000 50 48
  • a heat pump laundry dryer or heat pump washing machine having drying function comprising: a control unit controlling the operation of the laundry dryer or washing machine, a laundry treatment chamber for treating laundry using process air, a process air circuit for circulating the process air, a heat pump system having a refrigerant loop, in which the refrigerant fluid is circulated through a first and a second heat exchanger, a compressor for circulating the refrigerant fluid through the refrigerant loop, and a cooling fan unit for cooling the compressor, wherein the control unit is adapted to control the operation of the laundry dryer or of the washing machine as described above.
  • any of the above described features and elements of the method of operating a treatment apparatus may be combined in any arbitrary combination and may be implemented in a heat pump laundry dryer or heat pump washing machine having drying function as described above.
  • Fig. 1 depicts in a schematic representation a laundry treatment apparatus 2 which in this embodiment is a heat pump tumble dryer.
  • the tumble dryer comprises a heat pump system 4, including in a closed refrigerant loop 6 in this order of refrigerant flow B: a first heat exchanger 10 acting as evaporator for evaporating the refrigerant and cooling process air, a compressor 14, a second heat exchanger 12 acting as condenser for cooling the refrigerant and heating the process air, and an expansion device 16 from where the refrigerant is returned to the first heat exchanger 10.
  • the heat pump system 4 forms a refrigerant loop 6 through which the refrigerant is circulated by the compressor 14 as indicated by arrow B. If the refrigerant in the heat pump system 4 is operated in the transcritical or totally supercritical state, the first and second heat exchanger 10, 12 can act as gas heater and gas cooler, respectively.
  • the expansion device 16 is a controllable valve that operates under the control of a control unit 30 ( Fig. 2 ) to adapt the flow resistance for the refrigerant in dependency of operating states of the heat pump system 4.
  • the expansion device 16 may be a fixed, non-controllable device like a capillary tube.
  • the process air flow within the treatment apparatus 2 is guided through a compartment 18 of the treatment apparatus 2, i.e. through a compartment 18 for receiving articles to be treated, e.g. a drum 18.
  • the articles to be treated are textiles, laundry 19, clothes, shoes or the like. In the embodiments here these are preferably textiles, laundry or clothes.
  • the process air flow is indicated by arrows A in Fig. 1 and is driven by a process air blower 8 or fan.
  • the process air channel 20 guides the process air flow A outside the drum 18 and includes different sections, including the section forming the battery channel 20a in which the first and second heat exchangers 10, 12 are arranged.
  • the process air exiting the second heat exchanger 12 flows into a rear channel 20b in which the process air blower 8 is arranged.
  • the air conveyed by blower 8 is guided upward in a rising channel 20c to the backside of the drum 18.
  • the air exiting the drum 18 through the drum outlet (which is the loading opening of the drum) is filtered by a fluff filter 22 arranged close to the drum outlet in or at the channel 20.
  • the first heat exchanger 10 transfers heat from process air A to the refrigerant. By cooling the process air to lower temperatures, humidity from the process air condenses at the first heat exchanger 10, is collected there and drained to a condensate collector 26.
  • the process air which is cooled and dehumidified after passing the first heat exchanger 10 passes subsequently through the second heat exchanger 12 where heat is transferred from the refrigerant to the process air.
  • the process air is sucked from exchanger 12 by the blower 8 and is driven into the drum 18 where it heats up the laundry 19 and receives the humidity therefrom.
  • the process air exits the drum 18 and is guided in front channel 20d back to the first heat exchanger 10.
  • the main components of the heat pump system 4 are arranged in a base section 5 or basement of the dryer 2.
  • a cooling fan unit 24 or blower unit is arranged close to the compressor 14 for blowing cooling air C towards the compressor to remove heat from the compressor 14, i.e. from the heat pump system 4, during a drying operation.
  • the cooling air flow C which is an ambient air flow in the embodiments, is actively driven by the cooling fan unit 24 and is taking heat from (the surface of) the compressor 14.
  • the fan unit 24 comprises a blower or fan 36 which is driven by a fan motor 34 controlled by the control unit 30 of the dryer 2.
  • the electrical power consumed by the compressor 14 which is not transformed to work power by compressing the refrigerant is removed from the heat pump system 4, i.e. heat power of the compressor is balanced in the - under ideal consideration - closed loops of refrigerant and process air.
  • heat power of the compressor is balanced in the - under ideal consideration - closed loops of refrigerant and process air.
  • the heat deposited by the compressor 14 in the refrigerant loop 6 is balanced by the cooling fan unit 24 to prevent overheating.
  • the heat pump system 4 runs through a warm-up phase before reaching the steady state (i.e. normal or balanced mode after the warm-up period).
  • the conditions for optimizing cooling requirement over time changes.
  • the present invention provides a solution for optimizing cooling over time.
  • Fig. 2 shows a schematic block diagram of components of the dryer of Fig. 1 illustrating the control of the dryer components.
  • the control unit 30 is adapted to control the operation of the components of the dryer 2, like a drum motor 32, the compressor 14, the valve 16 (optionally) and the fan motor, according to the selected program. Via an input panel 38 a user may select a drying program or cycle, e.g. fast, economy, iron-aid. Optionally further inputs may be made, e.g. residue humidity, laundry amount or laundry type.
  • the control unit 30 is adapted to control the fan unit 24 such that after a warm-up period a steady state of the heat pump system is maintained by operating the fan unit 24 for example as described below.
  • operation parameter settings of the fan unit 24 may be modified or changed by the control unit 30 as schematically shown in Fig. 3a .
  • Operation parameter of the fan unit 24 may be a switch-On/-Off temperature set, a cooling fan rotation speed, an On/Off activation duty ratio, an On/Off time profile (e.g. 10 sec. On, 5 sec. Off).
  • Fig. 3a shows an example for modifying an operation parameter set of the fan unit 24:
  • an input variable x is detected or monitored by the control unit 30 at the beginning or before starting a drying program or cycle, e.g. the weight of laundry loaded in the drum 18.
  • the control unit 30 is adapted to control the fan unit 24 to execute a predetermined fan unit control profile - e.g. a profile having a predefined On/Off activation profile and/or a predefined fan rotation speed profile.
  • a look-up table is implemented in the control unit 30 which relates an input value or a range of input values to a specific fan unit control profile.
  • the predetermined control profile may be executed during the (remainder) of the drying program cycle or during a predetermined cycle step (cf. Fig. 4 ).
  • the input variable x is detected once (at a start of a drying program) and determines the operation parameter set for the remainder of the drying cycle (or a step thereof).
  • the input variable x is detected repeatedly, e.g. permanently in real-time, and the control unit 30 is adapted to calculate an operation parameter set f(x) in dependency of the detected input variable x repeatedly throughout a drying cycle.
  • the operation of the fan unit 24 may be closely adapted to specific requirements of a presently executed drying program or cycle.
  • Fig. 3b shows another example for modifying an operation parameter set of the fan unit 24:
  • the control unit 30 is adapted to determine or calculate a corresponding operation parameter set f (x, y) in dependency of both input variables x, y.
  • the control unit 30 may retrieve the operation parameter set f (x, y) from a look-up table (e.g. Table 2 or 3) or may calculate a corresponding operation parameter set from a predetermined function (e.g. equations [1] and [2]).
  • a look-up table is preferred when relating a plurality of input values (or ranges thereof) to one specific operation parameter set as shown in Table 2. Calculating an operation parameter set is preferred when at least one input value is detected in real-time.
  • Fig. 3c shows a further example for modifying an operation parameter set of the fan unit 24: In dependency of a first input variable x a second input variable g(x) to be detected is selected. For example a look-up table is implemented in the control unit which defines which second input variable is to be selected in dependency of the first input variable. In a next step the operation parameter set f(x, g(x)) is determined by the control unit 30 in dependency of the first and second input variable. For example by means of a further look-up table implemented in the control unit 30 or by providing a function or equation for calculating an operation parameter set for each detected first and second input value as described above.
  • Fig. 4 shows an exemplary flow chart of how a user selection modifies fan unit parameter settings.
  • Different fan unit operation parameter sets 1..6 are selected for each drying cycle 1..4, each drying cycle plus option 1..2 (e.g. economy, night) and each drying cycle plus final humidity 1..2 (e.g. iron aid).
  • a user selects drying cycle or program number 4 and selects additionally final humidity number 2, e.g. a high final humidity (iron-aid).
  • the control unit 30 is adapted to select cooling fan parameter set 6 and correspondingly controls the fan unit 24.
  • Fig. 5 shows a flow chart illustrating how fan unit operation parameter settings may be modified as described above in the example of Table 2.
  • the look-up table as shown in Table 2 is implemented in the control unit 30 to determine operation parameter settings in dependency of two input variables.
  • the first input variable is the drum motor speed and the second input variable is the temperature at the condenser exit detected by the temperature sensor 28.
  • a related fan unit On/Off temperature is selected by the control unit 30.
  • This parameter set defines the temperatures at which the fan unit 24 is switched-On and switched-Off, respectively, while the temperature of the refrigerant at the condenser exit is detected or monitored repeatedly, e.g. every second.
  • the operation parameter may be adapted continuously to the requirements of the presently executed drying cycle.
  • Fig. 6 depicts a diagram illustrating the modification of fan unit parameter settings over time in dependency of the drum motor speed as shown in the example of Table 2 and Fig. 5 , respectively.
  • Fig. 7 shows a flow chart illustrating how fan parameter settings are modified during a drying cycle or program.
  • the drying cycle comprises a plurality of sub-sequences, program steps or cycle steps, i.e. each cycle step is part of the corresponding drying cycle or program.
  • the duration or end of a cycle step or sub-sequence is determined by an end condition of an input variable which is detected during the cycle step. Every cycle step may be dependent on different parameters or input variables of each control system, for example drum movement speed or sequence and condensate pump activation mode (On/Off).
  • Each cycle step may be terminated when certain predetermined control conditions or cycle end conditions are verified, for example: time is elapsed, laundry humidity degree is reached, and/or condenser exit temperature is reached.
  • the duration or length of a cycle step is determined.
  • control conditions concerning e.g. laundry humidity or temperature thresholds
  • the duration of cycle steps may vary in dependency of the type of laundry and laundry load.
  • the operation of the fan unit i.e. the cooling power, can be closely adapted to the specific requirements of laundry to be dried.
  • a first operation parameter set 1 is selected and applied by the control unit to the cooling fan unit.
  • the control unit for example a predetermined On/Off profile as described above is applied to the fan unit 24.
  • the selected operation parameter set 1 may be dependent on the condenser exit temperature, e.g. the operation parameter set 1 comprises a threshold temperature or an On/Off temperature set as described above, which defines when the fan unit is switched On and Off.
  • the end or terminating condition for the first cycle step 1 is the condenser exit temperature of the refrigerant reaching a predetermined threshold temperature at the condenser exit, e.g. 45°C.
  • a second cycle step 2 is started, wherein a second operation parameter set 2 is selected and applied to the fan unit 24.
  • the second parameter set 2 is for example dependent on an input variable different to the input variable(s) of the first cycle step 1, e.g. the second input variable is the time elapsed since cycle step 2 is started which is detected by a counter implemented by the control unit.
  • the end condition for the second cycle step 2 is in this example an elapsed time of 30 minutes since cycle step 2 started. When this end condition is verified by the control unit the second cycle step 2 is terminated and a third cycle step 3 is started.
  • a third parameter set 3 is selected and applied to the fan unit 24 with starting the third cycle step 3.
  • the third parameter set 3 may be dependent on any of the above described input variables, wherein in this example the end condition of the third cycle step is determined by reaching a predetermined threshold value of laundry humidity, e.g. 12%. I.e. when this end condition is verified, e.g. by means of a humidity sensor of the treatment apparatus 2, the third cycle step 3 is terminated and a final fourth cycle step 4 is started.
  • a fourth operation parameter set 4 is selected by the control unit 30 for the fourth cycle step 4.
  • Any of the above described input variables and operation parameter settings may be used for the fourth cycle step 4.
  • a predetermined On/Off time profile an On/Off temperature set defining when the fan unit 24 is switched On and Off, a threshold value for the power consumption of the compressor 14 or a humidity of the laundry or process air.
  • the end condition for terminating cycle step 4 is reaching a laundry humidity of 0 %, i.e. dry laundry.
  • the terminating condition for the last cycle step could be reaching a final humidity of 10 %.
  • the end condition of the fourth cycle step terminates the drying program or drying cycle.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP12192939.2A 2012-11-16 2012-11-16 Verfahren für den Betrieb eines Wäschetrockners mit Wärmepumpe und Wäschetrockner mit Wärmepumpe oder Waschmaschine mit Wärmepumpe mit Trocknungsfunktion Withdrawn EP2733253A1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP12192939.2A EP2733253A1 (de) 2012-11-16 2012-11-16 Verfahren für den Betrieb eines Wäschetrockners mit Wärmepumpe und Wäschetrockner mit Wärmepumpe oder Waschmaschine mit Wärmepumpe mit Trocknungsfunktion
AU2013346941A AU2013346941B2 (en) 2012-11-16 2013-11-12 Method of operating a heat pump laundry dryer and heat pump laundry dryer or heat pump washing machine having drying function
EP13789796.3A EP2920354B1 (de) 2012-11-16 2013-11-12 Verfahren für den betrieb eines wäschetrockners mit wärmepumpe und wäschetrockner mit wärmepumpe oder waschmaschine mit wärmepumpe mit trocknungsfunktion
CN201380070535.XA CN104919109B (zh) 2012-11-16 2013-11-12 操作热泵衣物烘干机的方法以及热泵衣物烘干机或具有烘干功能的热泵洗衣机
PCT/EP2013/073643 WO2014076093A1 (en) 2012-11-16 2013-11-12 Method of operating a heat pump laundry dryer and heat pump laundry dryer or heat pump washing machine having drying function

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EP12192939.2A EP2733253A1 (de) 2012-11-16 2012-11-16 Verfahren für den Betrieb eines Wäschetrockners mit Wärmepumpe und Wäschetrockner mit Wärmepumpe oder Waschmaschine mit Wärmepumpe mit Trocknungsfunktion

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EP13789796.3A Active EP2920354B1 (de) 2012-11-16 2013-11-12 Verfahren für den betrieb eines wäschetrockners mit wärmepumpe und wäschetrockner mit wärmepumpe oder waschmaschine mit wärmepumpe mit trocknungsfunktion

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CN104894824A (zh) * 2015-06-26 2015-09-09 王招杰 一种吸水式微热风干衣机及干燥衣物的方法
EP2998431A1 (de) * 2014-09-18 2016-03-23 BSH Hausgeräte GmbH Wäschetrockner und trocknungsverfahren dafür
EP2998432A1 (de) * 2014-09-18 2016-03-23 BSH Hausgeräte GmbH Wäschetrockner und trocknungsverfahren dafür
EP2998430A1 (de) * 2014-09-18 2016-03-23 BSH Hausgeräte GmbH Trocknungsverfahren eines wäschetrockners und wäschetrockner mit dem trocknungsverfahren
EP3019655B1 (de) * 2013-07-09 2019-06-26 Electrolux Appliances Aktiebolag Wärmepumpentrockner mit verbesserter, felxiblerer betriebsweise
CN110359226A (zh) * 2018-04-11 2019-10-22 青岛海尔滚筒洗衣机有限公司 用于衣物处理设备的控制方法和衣物处理设备
US11377780B2 (en) 2017-07-14 2022-07-05 Electrolux Appliances Aktiebolag Method to control operation of a laundry dryer

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EP3239390B1 (de) * 2016-04-26 2019-11-06 Electrolux Appliances Aktiebolag Verfahren zum betreiben einer wäschetrocknervorrichtung und wäschetrocknervorrichtung
CN106245295B (zh) * 2016-08-31 2020-12-08 无锡小天鹅电器有限公司 干衣机的控制方法
EP3425107B1 (de) * 2017-07-07 2020-06-17 Electrolux Appliances Aktiebolag Verfahren zur steuerung eines wärmepumpenwäschetrockners
CN110965297B (zh) * 2018-09-27 2022-07-08 合肥美的洗衣机有限公司 衣物处理设备的控制方法
CN110965298B (zh) * 2018-09-27 2022-07-08 合肥美的洗衣机有限公司 衣物处理设备的控制方法
CN111235847A (zh) * 2018-11-29 2020-06-05 青岛海尔滚筒洗衣机有限公司 一种衣物烘干设备的控制方法及衣物烘干设备
CN111335000A (zh) * 2018-12-18 2020-06-26 青岛海尔滚筒洗衣机有限公司 一种衣物烘干装置及衣物烘干装置的控制方法
CN114182510A (zh) * 2021-12-31 2022-03-15 广东美的白色家电技术创新中心有限公司 干衣机控制方法、装置、干衣机及存储介质

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Publication number Priority date Publication date Assignee Title
EP3019655B1 (de) * 2013-07-09 2019-06-26 Electrolux Appliances Aktiebolag Wärmepumpentrockner mit verbesserter, felxiblerer betriebsweise
EP2998431A1 (de) * 2014-09-18 2016-03-23 BSH Hausgeräte GmbH Wäschetrockner und trocknungsverfahren dafür
EP2998432A1 (de) * 2014-09-18 2016-03-23 BSH Hausgeräte GmbH Wäschetrockner und trocknungsverfahren dafür
EP2998430A1 (de) * 2014-09-18 2016-03-23 BSH Hausgeräte GmbH Trocknungsverfahren eines wäschetrockners und wäschetrockner mit dem trocknungsverfahren
CN104894824A (zh) * 2015-06-26 2015-09-09 王招杰 一种吸水式微热风干衣机及干燥衣物的方法
US11377780B2 (en) 2017-07-14 2022-07-05 Electrolux Appliances Aktiebolag Method to control operation of a laundry dryer
CN110359226A (zh) * 2018-04-11 2019-10-22 青岛海尔滚筒洗衣机有限公司 用于衣物处理设备的控制方法和衣物处理设备
CN110359226B (zh) * 2018-04-11 2021-12-03 佛山海尔滚筒洗衣机有限公司 用于衣物处理设备的控制方法和衣物处理设备

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EP2920354B1 (de) 2020-06-10
AU2013346941A1 (en) 2015-06-04
WO2014076093A1 (en) 2014-05-22
CN104919109A (zh) 2015-09-16
CN104919109B (zh) 2017-07-28
AU2013346941B2 (en) 2018-02-01

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