EP3274499A1 - Procédé pour l'exécution d'un programme d'hygiène dans un séchoir pourvu d'une pompe à chaleur et séchoir prévu à cet effet - Google Patents

Procédé pour l'exécution d'un programme d'hygiène dans un séchoir pourvu d'une pompe à chaleur et séchoir prévu à cet effet

Info

Publication number
EP3274499A1
EP3274499A1 EP16707126.5A EP16707126A EP3274499A1 EP 3274499 A1 EP3274499 A1 EP 3274499A1 EP 16707126 A EP16707126 A EP 16707126A EP 3274499 A1 EP3274499 A1 EP 3274499A1
Authority
EP
European Patent Office
Prior art keywords
compressor
speed
temperature
sensor
dryer
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
EP16707126.5A
Other languages
German (de)
English (en)
Other versions
EP3274499B1 (fr
Inventor
Thomas König
Alvaro Harbach
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Hausgeraete GmbH
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 BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Priority to PL16707126T priority Critical patent/PL3274499T3/pl
Publication of EP3274499A1 publication Critical patent/EP3274499A1/fr
Application granted granted Critical
Publication of EP3274499B1 publication Critical patent/EP3274499B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D06F58/44—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of conditioning or finishing, e.g. for smoothing or removing creases
    • 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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08—Control circuits or arrangements thereof
    • 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
    • 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
    • D06F2103/04—Quantity, e.g. weight or variation of 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
    • 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
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • D06F2103/10—Humidity expressed as capacitance or resistance
    • 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
    • D06F2103/36—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
    • D06F2103/50—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
    • 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
    • D06F2105/26—Heat pumps
    • 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
    • D06F2105/28—Electric heating
    • 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
    • D06F2105/30—Blowers
    • 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 
    • 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 for carrying out a hygiene program in a dryer with a heat pump and a dryer suitable for this purpose. More particularly, the invention relates to a method for carrying out a hygiene program in a dryer with a drum for items to be dried, a process air circuit in which a blower for the transport of process air is arranged, a control unit, a heat pump with an evaporator, a condenser, a throttle and a compressor, and at least one sensor, and a dryer particularly suitable for carrying out this method.
  • heated air in a dryer, heated air (so-called process air) is passed through a drying chamber containing a moist object, usually a drum, through a blower.
  • the hot air absorbs moisture from the objects to be dried.
  • the then moist process air is passed into a heat exchanger, which can be preceded by a filter, in particular a lint filter, for filtering out dirt particles, in particular fluff in the case of a tumble dryer or washer-dryer.
  • a filter in particular a lint filter
  • the heat pump can serve to extract heat from the process air flowing from the moist objects, which is supplied to a corresponding heat sink, and to conduct this heat by means of a suitable pumping device to a heat source, from which it reaches the process air before it flows to be dried objects, usually wet laundry, applied.
  • heat can also be removed from an environment of the dryer by means of the heat sink and fed to the process air via the heat source.
  • a dryer equipped with a compressor-type heat pump (also referred to herein as a "compressor type)
  • the warm, moisture-laden process air is cooled substantially in a heat sink evaporator of the heat pump, where the heat transferred to evaporate a heat exchanger
  • the vaporized refrigerant reaches the compressor (also referred to as “compressor”) and is compressed there.
  • the refrigerant circulating in the refrigerant circuit (also referred to herein as the "heat pump cycle”) is driven by the compressor so that the compressor provides the energy needed to operate the pumping process. From the compressor it passes to the condenser, where it is liquefied with the release of heat. The heat released heats the process air.
  • the liquefied refrigerant flows through a throttle, where its internal pressure is reduced, back to the evaporator, which closes the circuit.
  • the throttle is in particular executable as a valve, aperture or capillary. Often the heat pump cycle is operated capillary tube controlled.
  • the condensed water is then generally collected in a suitable container.
  • a heat pump clothes dryer with a compressor-type heat pump generally has a closed process air cycle and a heat pump cycle. If process air is sent through the drum loaded with damp laundry, the process air is loaded with water vapor, so that the process air can have a relative humidity of up to 100%.
  • a drying process can be subdivided into three successive phases, namely a heating phase, a quasi-stationary drying phase and a transient drying phase. In the heating phase, process air and damp laundry items are generally heated up to a first maximum temperature value T p at which temperature during the quasi-stationary drying phase the laundry items are dried, in particular with regard to the surface water.
  • the relative humidity of the process air decreases, with the beginning of the transient drying phase, in general, the temperature of the process air at the drum outlet increases. This is due in particular to the fact that the surface water of the wet laundry is essentially evaporated and the drying phase is dominated by so-called deep drying of the laundry. However, this temperature increase takes place only gradually. Since in a dryer equipped with a heat pump the temperature in a laundry drum is generally relatively low, for example By 40 ° C, the temperature increase towards the end of a drying process is too slow to ensure the necessary for a hygienic effect, ie germ killing, high temperature for a sufficiently long period. Finally, prolonged heating of already dry items of laundry would be energetically disadvantageous at the end of a drying process.
  • heat pump cycle For the operation of a heat pump dryer, it is advantageous if the heat pump cycle can be controlled.
  • a compressor with a variable power consumption can be used.
  • Heat pump dryer with a compressor with a variable capacity are known per se.
  • the publication EP 2 284 310 A1 describes a dryer with at least one heat pump system, wherein the dryer a process air circuit with a drum for laundry to be dried, at least one cooling circuit, a compressor with a variable rotational speed, a first and a second heat exchanger for each one thermal coupling between the process air circuit and the cooling circuit, a control unit for controlling the rotational speed of the compressor and at least one sensor for the measurement of at least one physical parameter of the process air flow, the coolant and / or the laundry as a function of time contains.
  • a central control unit is arranged to evaluate the time evolution of the parameters and to reduce the rotational speed of the compressor in accordance with the evaluation of the time dependence of the parameters.
  • the publication DE 10 2005 041 145 A1 describes a tumble dryer in which the warm air used to dry the laundry is heated using a heat pump heating system containing a variable power compressor.
  • the tumble dryer includes a controller that controls the performance of the compressor in response to the temperature outside the tumble dryer.
  • the publication EP 2 182 104 A describes a washer-dryer with a compressor-type heat pump which contains a speed-controllable compressor motor, for example a brushless DC motor, and a temperature sensor for measuring the outside temperature.
  • the design of the washer-dryer is intended to ensure that, when using a tubular orifice valve with a fixed orifice, the formation of frost on the evaporator is prevented when the compressor motor is at rest.
  • the publication EP 2 415 927 A describes a clothes dryer with a heat pump containing a variable speed compressor. This can be avoided that a temperature of the refrigerant in the refrigerant circuit of the heat pump is too high.
  • the publication EP 2 735 643 A1 describes a method for controlling a tumble dryer with a blower motor for the operation of a blower for drying air with a variable speed and a drum motor for driving the laundry drum.
  • the speed of the fan motor is regulated on the basis of the power consumption or the electric current of the drum motor.
  • the publication EP 1 775 368 A1 describes a washer-dryer or laundry drier which comprises a control unit which is set up to regulate the on and off phases of a blower and, moreover, to regulate the speed of rotation of the blower. Described is also a method for drying wet laundry, in which the rotational speeds of the fan in a first and an adjoining second drying phase differ in that the flow rate of the air in the first drying phase is greater.
  • the publication DE 10 2007 018 787 A1 describes a method for operating a condensation dryer with a drying chamber for the objects to be dried, a process air circuit in which there is a heater for heating the process air and heated process air is guided by means of a blower over the objects to be dried , and a heat pump circuit with an evaporator, a compressor and a condenser, and a sensor arrangement for determining a moisture in the objects to be dried.
  • the humidity is determined and until heated to a predetermined value (F) of the humidity in the range of 0% to 12%, the process air through the condenser and after falling below the predetermined value, the heater is switched on and operated in such a way that over a period of at least 5 minutes in the drying chamber Air temperature of at least 70 ° C is.
  • F predetermined value
  • the method should be suitable for disinfecting the objects, which are in particular laundry items. However, additional conventional heating is required for disinfection.
  • the heat pump can not be used because it can not or only work poorly at the high temperatures of the process air, which are required for disinfecting.
  • Hygiene programs are known, for example, in washing machines and washer-dryers.
  • DE 197 51 028 A1 describes a method for carrying out a hygiene program in a program-controlled washing machine or a program-controlled washer-dryer with a tub for receiving washing liquid and a rotatably mounted therein drum, wherein in the tub water is filled, the at least one temperature of 70 ° C or heated to a temperature of at least 70 ° C, the drum is driven during the heating and / or for a predetermined first period after reaching the wash temperature of at least 70 ° C at a washing speed and then the drum with a increased speed is rotated.
  • this background it was an object of the present invention to provide a method for carrying out a hygiene program in a dryer with a heat pump, which allows an efficient hygienic effect, without requiring an increased energy expenditure is required.
  • this hygiene program should be as short as possible and possibly lead to no or only a short extension of a drying program.
  • the object of the invention was also to provide a suitable dryer for carrying out this method.
  • the invention thus relates to a method for carrying out a hygiene program in a dryer with a drum for items to be dried, a process air circuit in which a blower for the transport of process air is arranged, a control unit, a heat pump with an evaporator, a condenser , a throttle and a compressor, and at least one sensor, wherein by means of the sensor, the decrease in moisture F w of the laundry is monitored and upon reaching a predetermined lower humidity Fw lowlim a speed u of the fan is reduced and / or a power consumption p a variable-capacity compressor is increased.
  • the speed u of the fan is reduced and / or the power consumption p of the variable-power compressor is increased until a temperature T H of the process air of at least 65 ° C, preferably of at least 70 ° C is reached.
  • the temperature T H of the process air for a hygiene effect without damaging laundry in the range of 70 to 75 ° C.
  • the speed u and / or the power consumption p be controlled so that the temperature T H of the process air is maintained for a predetermined period At.
  • the period At is preferably at least 15 minutes, more preferably at least 17 minutes, and At is most preferably in the range from 18 to 25 minutes.
  • the decrease of the moisture F w of the laundry is monitored according to the invention. This can be done in very different ways, whereby different measuring principles of a sensor can occur, if necessary. Also in combination.
  • a temperature and / or a relative humidity at the drum outlet or a moisture content of the laundry items in the drum can be measured as a function of time.
  • the predetermined lower humidity F w lowlim the laundry items can be achieved depending on the specification in different drying phases or at transitions between drying phases .
  • the lower moisture F w lowlim is preferably in a range of 5 to 15%, particularly preferably 8 to 12%, based on the mass of the laundry items. This is also referred to as "residual moisture content (ERF)".
  • signals from the sensor are evaluated to detect a transition from a quasi-stationary to a transient drying phase and, upon a detected transition, the speed u of the fan is reduced and / or the power consumption p of the variable-power compressor is increased.
  • sensor means a single sensor or a system of sensors
  • further sensor signals S i are measured and with respect to an increasing Drying of the laundry items evaluated so that the speed u of the fan and the power consumption p of the compressor are increased according to a desired increase in temperature or corresponding to a desired increase in temperature, that is, in this embodiment, the drying process even after reaching a predetermined lower humidity of Fw lowlim is monitored.
  • a conductivity sensor is used as the sensor, the conductivity value L w of the laundry items being measured as a function of time t, and the predetermined lower humidity Fw lowlim being reached if a predetermined lower conductivity value L w min of the laundry items and / or a predetermined minimum value (ALw / At) min for the amount of time decrease of the conductance L w is reached.
  • a transition from the quasi-stationary to the non-stationary drying phase can be determined by using the conductance sensor in the drum.
  • the predefined lower conductance L w mm of the items of laundry and / or a predetermined minimum value (AL W / At) min have been reached for the amount of the time reduction of the conductance L w .
  • the predetermined lower conductance L w min of the laundry may correspond to the "wipe-wet.”
  • relative humidity is provided at an exit of the drum with a humidity sensor F rel of the drum leaving the process air is measured.
  • the speed u of the fan is reduced and the power consumption P of the compressor for a predetermined time cavities At set increased such that a desired increase in temperature can be achieved.
  • a temperature T K M of a refrigerant is preferably measured in the heat pump cycle by means of a temperature sensor S T KM and the power consumption p of the variable-power compressor controlled so that the temperature T K M within a range T K M 1 ⁇ T K M ⁇ T K M 2 lies.
  • a temperature T K M of the refrigerant is measured by means of the temperature sensor S T K M arranged in the heat pump cycle and the power consumption p of the power-dependent compressor is reduced when the maximum permissible refrigerant temperature T K M MAX is reached or exceeded ,
  • T K M MAX depends on the type of refrigerant and the location of the temperature sensor in the heat pump cycle. For example, T K M MAX can be very close to a maximum temperature specified by the manufacturer of a refrigerant for efficient and safe use of the refrigerant. Another factor may be the maximum allowable coil temperature of the drive motor of the compressor. This is influenced by the insulation used and is for example 1 15 ° C. Another limiting factor that influences T K M MAX has, is the lubricant used in the compressor. Excessively high temperatures can lead to carbonization and thus failure of the lubricant and eventually failure of the compressor. An important factor is also the pressure of the gaseous refrigerant behind the compressor, which must be compared with the strength of the tubes used.
  • a temperature T PL of the process air is preferably measured by means of a temperature sensor S T P L arranged in the process air circuit, and the power consumption p of the compressor is reduced when a predefined maximum permissible process air temperature T PL max is reached. If an additional fan is present, it cools down the compressor with ambient air in a first step. If necessary, then in a second step, in general, the compressor is shut down in the case of an unregulated compressor or in the case of a controlled compressor, the minimum allowed speed of the compressor is controlled. Only then, if necessary, the compressor would be turned off. Preferably, the compressor is switched off when a critical process air temperature Tpi_ knt > T PL max is reached or exceeded. If present, the temperature sensor S T PL is preferably arranged between the drum and the evaporator.
  • variable capacity compressor generally uses a separate drive motor.
  • variable-power compressor is preferably a compressor driven by a BLDC motor, in particular a screw compressor or a rotary compressor.
  • the power-dependent compressor is a variable-speed compressor whose speed ⁇ ⁇ is varied as a function of the speed u of the fan and / or the sensor signals of the sensor, wherein in the control unit, a relationship between the speed oo K and the speed u and / or the aforementioned sensor signals (eg moisture of the laundry) is deposited.
  • the rotational speed ⁇ ⁇ of the variable-speed compressor is varied as a function of a conductance L w of the laundry items measured by a conductivity sensor and / or a change in time AL W / At of the conductance, wherein a relationship stored in the control unit between the control unit Speed ⁇ ⁇ and the measured conductivity L w and / or the temporal change AL W / At is used.
  • the load of the drum with laundry is taken into account for carrying out the method.
  • the loading of the drum with laundry items by the control unit is taken into account by a relationship between a conductivity L w, a power consumption p of the variable-power compressor and the load with the laundry is stored in the control unit.
  • the loading can be entered manually by a user of the dryer or automatically determined by an optional suitable measuring device in the dryer, such as a balance.
  • the outside temperature T R can advantageously be taken into account in an installation room of the dryer.
  • the waste heat losses of the dryer are dependent on the ambient temperature.
  • the temperature difference between the heat-emitting surfaces in the dryer which may also be referred to as convection surfaces, eg the drum, is lower to the ambient temperature, resulting in lower energy losses due to convection.
  • the amount of heat dissipated by the process air is usually controlled via an additional fan. This would increase the waste heat losses.
  • a regulation of the heat pump cycle by means of a variable-power compressor avoids this problem.
  • the method is adapted to the outside temperature of a Aufstellraumes of the dryer by using a temperature sensor S T AR a temperature T R is measured in the installation room and the variable-power compressor is operated with a power consumption p, which is additionally dependent on the measured temperature T R , so that the temperature of a refrigerant in the heat pump cycle is within a range T K M 1 ⁇ T K M ⁇ T K M 2 .
  • the variable-power compressor is in particular a screw compressor or a rotary piston compressor.
  • a speed-controlled compressor is used as a power-dependent compressor whose speed ⁇ ⁇ is varied in dependence on the measured temperature T R.
  • the rotational speed u of the fan is selected as a function of the outside temperature T R , for which purpose a relationship between the rotational speed u and the outside temperature T R is stored in the control unit.
  • These values can advantageously also be stored in the control unit for different values of the conductivity L w of the items of laundry.
  • a rotational speed ⁇ ⁇ of a variable-speed compressor as a function of a conductance L w of the items of laundry and optionally the outside temperature T R in a drying room of the dryer is based on a relationship between the speed ⁇ ⁇ and the conductance stored in the control unit L w and possibly the temperature T R varies.
  • the temperature T R in the installation room is measured with a temperature sensor S T AR , which can be arranged at different locations on the dryer, for example in contact with the installation room or inside the dryer.
  • the outside temperature T R is measured in the installation room with a temperature sensor S T P L arranged in the process air cycle, if a predetermined time period t set has elapsed since a last drying process was performed and the temperature of the process air was measured. In a drying process, the temperature of the process air rises gradually. As already mentioned, in the heating phase process air and damp laundry items are generally heated up to a first maximum temperature value T p .
  • the speed-dependent compressor is at a power consumption until a predetermined temperature T p at which the time increase of the temperature T PL of the process air has dropped to a minimum value is reached p, which is in the range of 0.9 to 1 p max operated.
  • p max is the maximum power consumption of the compressor.
  • the invention also relates to a dryer with a drum for objects to be dried, in particular wet laundry, for laundry items to be dried, a process air circuit in which a blower for the transport of process air is arranged, a control unit, a heat pump with an evaporator, a condenser , a throttle and a compressor, and at least one sensor, wherein the control unit is adapted to perform a method in which by means of the sensor, the decrease in moisture F w of the laundry is monitored and upon reaching a predetermined lower humidity Fw lowlim a speed u des Blower is reduced and / or a power consumption p of a variable-power compressor is increased.
  • the compressor used in the dryer according to the invention is preferably a screw compressor or a rotary piston compressor, in particular a rotary piston compressor.
  • the temperature sensor or sensors preferably have an elongate body with a temperature-sensitive tip.
  • a preferred temperature sensor is an NTC sensor.
  • the temperature sensor S T PL is inclined in the process air circuit in the direction of the evaporator.
  • the dryer according to the invention generally has a condensate tray for collecting the condensate occurring in the evaporator and optionally in another heat exchanger.
  • the condensate is either by manual emptying or by pumping by means of a condensate pump into a condensate tank, which in turn can be emptied manually, or disposed of directly into a sewage system.
  • a heat pump and an air-air heat exchanger can be used simultaneously.
  • heat pump and air-air heat exchanger can complement the cooling of moist, warm process air, for example, the fact that the air-air heat exchanger is used in particular in the event of impending overheating of the refrigerant.
  • an electric heating device may additionally be present in the dryer according to the invention. If, in one embodiment, the dryer comprises an additional electric heating device, a more rapid heating of the process air and thus a more rapid execution of a drying process in the dryer are possible. However, this would affect a possible energy savings.
  • the dryer of the invention preferably also comprises an optical and / or acoustic display device which allows the user of the dryer to view e.g. Operating parameters and / or an expected duration of the drying process allows.
  • the invention has numerous advantages.
  • the invention makes it possible for an efficient hygiene program to be carried out in a dryer, in which effective germ killing can be achieved in an energy-efficient manner.
  • the method according to the invention allows a comparatively short hygiene program, wherein in embodiments of the invention a drying program is not extended even when a hygiene program is carried out. Due to a total possible shorter drying program, ie a shorter drying time, thermal losses are reduced, resulting in energy savings. Moreover, there is an energy savings in that no over-drying of the laundry is required. Even if the method according to the invention is carried out only at a final residual moisture content of 0%, the invention makes it possible for a hygiene program to run even faster and to be terminated than hitherto.
  • the inventive method and dryer according to the invention also have the advantage in embodiments that a drying program can be carried out with a hygiene program in which different installation conditions and different weather conditions and seasons can be optimally taken into account by taking into account an outside temperature in the installation room of the dryer.
  • the hygiene program it is possible to take into account the sensitivity of garments such as wool, silk or lace, by allowing the hygiene program to adapt the temperature of the process air and the duration of the hygiene program to the type of garment. This can be done by changing the power consumption of the variable-power compressor, for example by setting a suitable upper temperature of the refrigerant.
  • blowers and variable-capacity compressors can also be matched to one another and thus a hygiene program can be optimally adapted to the type and quantity of items of laundry.
  • Figure 1 shows a vertical section through a dryer according to a first embodiment in which a method disclosed herein can be carried out. Other embodiments are conceivable.
  • Fig. 2 shows various courses for the change of the rotational speed of a fan after the start of a hygiene program.
  • Fig. 3 shows various characteristics for the change of the power consumption of a variable-power compressor.
  • the dryer 1 shown in FIG. 1 according to a first embodiment has a drum 2 rotatable about a horizontal axis as a drying chamber within which drivers 14 are mounted for moving laundry during a drum rotation.
  • Process air is by means of a blower 12 through the drum 2 in a Process air circuit 3 out.
  • the moist, warm process air is passed into the evaporator 8 of a heat pump 8,9, 10, 1 1, which also has a variable-speed compressor 1 1, a throttle 10 and a condenser 9.
  • the arrows shown in Fig. 1 indicate the flow direction of the air.
  • the vaporized in the evaporator 8 refrigerant heat pump 8,9, 10, 1 1 is passed through the variable-speed compressor 1 1 to the condenser 9.
  • the condenser 9 the refrigerant liquefies with heat being released to the process air flowing in the process air circuit 3.
  • the then present in liquid refrigerant is passed through the throttle 10 in turn to the evaporator 8, whereby the heat pump cycle is closed.
  • a temperature sensor S T KM 6 between condenser 9 and throttle 10 measures in this embodiment, the temperature T K of the refrigerant.
  • a temperature sensor S T P L 5 mounted in the dryer 1 in the process air cycle between drum 2 and evaporator 8 serves for measuring the temperature T PL of the process air or, if the dryer 1 has been switched off for a long time, for measuring the temperature T R im Installation room, which can also be used in this embodiment for controlling the hygiene program and the dryer or its heat pump. In other embodiments of a heat pump dryer, however, can be dispensed with a measurement of the process air temperature.
  • an electric heater 13 is provided, which can be used for more rapid heating of the process air.
  • a hygiene program can be carried out even faster.
  • other embodiments of the invention can be dispensed with the electric heater 13, as this leads to a higher energy consumption.
  • the drum 2 is mounted in the embodiment shown in FIG. 1 at the rear bottom by means of a pivot bearing and front by means of a bearing plate 18, the drum 3 rests with a brim on a sliding strip 19 on the bearing plate 18 and is held at the front end.
  • the control of the dryer 1 via a control unit 4, which can be controlled by the user via an operating unit 20.
  • a display device 16 allows the user of the dryer to display the execution of a hygiene program as well as details (temperature, duration) of the hygiene program.
  • the display device 16 is also used to display e.g. Operating parameters and / or an expected duration of the drying process used.
  • process air is repeatedly circulated through the process air circuit 3 until a hygiene program is completed and preferably a desired degree of drying of the laundry is achieved.
  • the dryer of FIG. 1 by controlling the operation of the heat pump, and in particular the temperature of the refrigerant, allows precise control and control of a hygiene program by controlling the fan 12 and the compressor 11 so that the minimum temperature required to carry out the hygiene program, here 70 ° C, as quickly as possible and can be maintained for a given period.
  • the fan speed u is reduced as desired and at the same time increases the power consumption of the variable-power compressor 1 1 in this embodiment.
  • a defined maximum temperature T max for the temperature T PL of the process air is not exceeded.
  • the drum 2 and the fan 12 are driven by a common, not shown in FIG. 1, variable-power electric motor, here a BLDC motor.
  • a BLDC motor is driven by a common, not shown in FIG. 1, variable-power electric motor, here a BLDC motor.
  • Another, also not shown in FIG. 1, variable-power electric motor is used to drive the power variable compressor.
  • a desired point in time for the beginning of a hygiene program is determined by evaluating sensor signals of a sensor. This can be coupled independently of a drying phase taking place to a specific moisture content of the items of laundry, for example advantageously 10%, based on the mass of the moist items of laundry. Their moisture can be tracked via the evaluation of signals from the sensor.
  • a conductance sensor 22 in the drum 2 is used as such a sensor, with the conductivity value L w of the laundry items not shown in FIG is measured by the time t.
  • the moisture of the items of laundry and in particular the conductance of the wet items of laundry decrease particularly pronounced in the transition from the quasi-stationary to unsteady drying phase. Therefore, the start of a hygiene program can also be linked to this transition, whereby a speed u of the blower 12 is reduced and a power consumption p of the compressor 11 is increased in the event of a detected transition.
  • the transition from the quasi-stationary to the transient drying phase is determined when a predetermined lower conductance L w min of the laundry items and / or a predetermined minimum value (AL W / At) min for the amount of the time decrease of the conductance L w is reached.
  • a humidity sensor 23 for measuring a relative humidity F re i of the process air leaving the drum 2 is also arranged at an exit of the drum 2.
  • Fig. 2 shows different curves for the change in the speed u of fan 12 after the start of a hygiene program, this beginning can be done, for example, with the entry into the transient drying phase, depending on the time t.
  • the fan speed u and power consumption p of the compressor can be adapted to the decreasing moisture of laundry items. It can be done automatically or by a user a desired reduction in the speed u of the fan.
  • a sudden decrease 24 of the fan speed u from a constant or nearly constant value during the quasi-stationary phase to a constant value during the transient phase is possible.
  • a gradual decrease 15 of the fan speed u may also be provided, the speed u being reduced in comparatively small steps to a constant value.
  • an asymptotic decrease 25 or a linear decrease 26 of the fan speed u is possible.
  • Fig. 3 shows various courses for the change of the power consumption p, e.g. a compressor speed, the variable-power compressor 1 1 after the start of a Hygi- ene program, this beginning can take place, for example, with the entry into the transient drying phase, as a function of the time t.
  • the fan speed u and power consumption p of the compressor can be adapted to the decreasing moisture of laundry items.
  • a desired increase in power consumption p of the compressor It can be done automatically or by a user a desired increase in power consumption p of the compressor.
  • a sudden increase 29 of the power consumption p from a constant or nearly constant value during the quasi-stationary phase to a constant value during the transient phase is possible.
  • a stepwise increase 28 of the power consumption p may also be provided, the power consumption p being increased in comparatively small steps to a constant value.
  • an asymptotic increase 30 or a linear increase 27 of the power consumption p is also possible.
  • the increase in the power consumption p is preferably carried out via an increase in the rotational speed of the compressor.

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

Abstract

L'invention concerne un procédé pour l'exécution d'un programme d'hygiène dans un séchoir (1) comprenant un tambour (2) pour du linge à sécher, un circuit d'air de traitement (3), dans lequel est disposée une soufflerie (12) pour le transport de l'air de traitement, une unité de commande (4), une pompe à chaleur (8, 9, 10, 11) comprenant un évaporateur (8), un liquéfacteur (9), un étranglement (10) et un compresseur (11), et au moins un capteur (5, 6, 22, 23), au moyen duquel la diminution de l'humidité FW du linge est surveillée, et une vitesse de rotation u de la soufflerie (12) est réduite et/ou une puissance absorbée p d'un compresseur (11) à puissance variable est augmentée lorsqu'un seuil inférieur d'humidité prédéfini FW lowlim est atteint. L'invention concerne en outre un séchoir (1) permettant la mise en oeuvre dudit procédé.
EP16707126.5A 2015-03-26 2016-03-01 Procédé pour l'exécution d'un programme d'hygiène dans un séchoir pourvu d'une pompe à chaleur et séchoir prévu à cet effet Active EP3274499B1 (fr)

Priority Applications (1)

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PL16707126T PL3274499T3 (pl) 2015-03-26 2016-03-01 Sposób przeprowadzania programu higienicznego w suszarce z pompą ciepła i odpowiednia do tego suszarka

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DE102015205483.7A DE102015205483A1 (de) 2015-03-26 2015-03-26 Verfahren zur Durchführung eines Hygieneprogrammes in einem Trockner mit einer Wärmepumpe und hierzu geeigneter Trockner
PCT/EP2016/054305 WO2016150660A1 (fr) 2015-03-26 2016-03-01 Procédé pour l'exécution d'un programme d'hygiène dans un séchoir pourvu d'une pompe à chaleur et séchoir prévu à cet effet

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US10633785B2 (en) 2016-08-10 2020-04-28 Whirlpool Corporation Maintenance free dryer having multiple self-cleaning lint filters
US10738411B2 (en) 2016-10-14 2020-08-11 Whirlpool Corporation Filterless air-handling system for a heat pump laundry appliance
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KR20180070175A (ko) * 2016-12-16 2018-06-26 엘지전자 주식회사 의류처리장치의 제어방법
US10502478B2 (en) 2016-12-20 2019-12-10 Whirlpool Corporation Heat rejection system for a condenser of a refrigerant loop within an appliance
KR102711593B1 (ko) * 2017-01-06 2024-09-30 엘지전자 주식회사 의류처리장치의 제어방법
US10514194B2 (en) 2017-06-01 2019-12-24 Whirlpool Corporation Multi-evaporator appliance having a multi-directional valve for delivering refrigerant to the evaporators
US10718082B2 (en) 2017-08-11 2020-07-21 Whirlpool Corporation Acoustic heat exchanger treatment for a laundry appliance having a heat pump system
DE102018100442A1 (de) * 2018-01-10 2019-07-11 Miele & Cie. Kg Verfahren und Vorrichtung zum Betreiben eines Wäschetrockners
CN110670326B (zh) * 2018-07-02 2023-01-06 青岛海尔洗涤电器有限公司 衣物处理设备及其烘干温度控制方法
DE102021106619A1 (de) 2021-03-18 2022-09-22 Miele & Cie. Kg Verfahren zum Durchführen eines Hygieneprogramms

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DE102015205483A1 (de) 2016-11-03
CN107407038A (zh) 2017-11-28
EP3274499B1 (fr) 2019-05-29
CN107407038B (zh) 2019-07-16
WO2016150660A1 (fr) 2016-09-29
PL3274499T3 (pl) 2019-11-29

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