EP3187652B1 - Procédé pour commander une machine de séchage de linge de pompe à chaleur - Google Patents

Procédé pour commander une machine de séchage de linge de pompe à chaleur Download PDF

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Publication number
EP3187652B1
EP3187652B1 EP15203019.3A EP15203019A EP3187652B1 EP 3187652 B1 EP3187652 B1 EP 3187652B1 EP 15203019 A EP15203019 A EP 15203019A EP 3187652 B1 EP3187652 B1 EP 3187652B1
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EP
European Patent Office
Prior art keywords
outdoor
phase
drying
sub
drum
Prior art date
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Application number
EP15203019.3A
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German (de)
English (en)
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EP3187652A1 (fr
Inventor
Nicola Reid
Roberto Ragogna
Fabio GARZENA
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Electrolux Appliances AB
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Electrolux Appliances AB
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/206—Heat pump arrangements
    • 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
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/12—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
    • D06F2103/32—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
    • D06F2103/44—Current or voltage
    • D06F2103/48—Current or voltage of the motor driving the pump
    • 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
    • D06F2103/58—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to condensation, e.g. condensate water level
    • 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
    • D06F2105/62—Stopping or disabling machine operation
    • 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
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity

Definitions

  • the present invention relates to a method for controlling a heat pump laundry drying machine, wherein the drying machine comprises an outdoor textiles drying procedure for drying outdoor textiles.
  • outdoor textiles have a waterproof and breathable thin film material with a micro-porous structure.
  • DWR durable water repellent
  • Most factory-applied treatments are fluoropolymer based.
  • Durable water repellents are commonly used in conjunction with waterproof breathable fabrics such as Gore-Tex to prevent the outer layer of fabric from becoming saturated with water. This saturation, called “wetting out”, can reduce the garment's breathability (moisture transport through the breathable membrane) and let water through.
  • Methods for factory application of DWR treatments involve for example applying a solution of a chemical onto the surface of the fabric by spraying or dipping. More recently the chemistry is applied in the vapor phase using Chemical Vapor Deposition (CVD) machinery.
  • CVD Chemical Vapor Deposition
  • This hydrophobic chemical treatment penetrates the fibres and lowers the surface tension of the fabric, causing water to bead up and roll off the outer layer of fabric, instead of being absorbed.
  • the DWR treatment is not permanent: the surface coating can degrade through regular wear and tear, exposure to dirt, detergent, insect repellent and other impurities causing the outer fabric to absorb water. As the DWR wears off over time, re-treatment is recommended when necessary. Certain types of fabrics need to be re-treated to maintain water-repellency, as fluoropolymers decompose over time when exposed to water and chemicals.
  • Affected garments can be treated with a "spray-on" or “wash-in” treatment to improve water-repellency.
  • Heat treatment may reactivate the factory applied repellent finish and aids the repelling of water, and other liquids such as oils.
  • a method for controlling drying machine includes selecting and starting an outdoor textiles drying procedure, and then entering a preheating stage, a main drying stage, and a cooling stage.
  • a working temperature of the drying machine is lower than a working temperature of an ordinary drying procedure, and after the cooling stage, nominal water content of loaded outdoor textiles is higher than nominal water content after the ordinary drying procedure is performed.
  • nominal water content of the outdoor textiles is higher than nominal water content of the other textiles after the ordinary drying procedure is performed, which ensures that wrinkles caused by over-drying do not occur to the outdoor textiles, and at the same time, the material and sealing strips at the seams of the outdoor textiles are prevented from being damaged.
  • a drying machine implementing the method is also provided.
  • the disclosed treatment in a dryer does not provide the optimal solution for re-activating, also called re-proofing, outdoor clothing and textile.
  • the present invention relates to a method for controlling a heat pump drying machine where an outdoor drying cycle is provided, to re-activate (or "re-proof") the water repellent characteristics of outdoor textiles, such as outdoor clothes and garments.
  • the outdoor textile in order to have the surface treatment "re-activated", needs a drying cycle, or drying cycle phase, having relatively high temperature and low humidity, for example a temperature above 55°C and a humidity below 5%.
  • heat pump laundry dryers are not generally designed to operate at such high temperatures, that is, generally, heat pump laundry dryers operate at temperatures of the process air, and thus reached by the laundry, below 50°C, which are commonly considered high enough to dry standard clothes or textiles. If a heat pump laundry dryer reaches temperatures above 50° - 55° C in the process air, it may happen that safety measures activate which block or limit either the dryer functioning or further raise in process air temperature.
  • one of the goal of the invention is to provide a drying method which achieves a proper reactivation of the waterproof characteristics of outdoor textiles - which have had for example a waterproof surface treatment during manufacturing - by means of a drying cycle especially designed for such outdoor textiles and which allows heat pump dryers to reach the required "high" temperatures, i.e. temperatures suitable for performing reactivation of the waterproof characteristics of outdoor textiles.
  • the invention relates to a method for controlling a heat pump laundry drying machine, wherein the heat pump laundry drying machine includes:
  • the laundry drying machine of the invention may be preferably a laundry dryer or a laundry washer dryer.
  • a heat pump laundry drying machine includes a rotatable treating chamber, such as a drum, in which the load of laundry, e.g., clothes, or other items to be washed and/or dried are placed.
  • the laundry is made of a given textile.
  • the treating chamber is adapted to rotate in a direction and in an opposite direction, reversing its rotation, for example driven by a motor, such as a variable speed motor in order to regulate the speed of rotation of the treating chamber.
  • the treating chamber is part of a process circuit, in particular for example a closed-loop air circuit in case of a condensed dryer or an open air circuit in case of a vented dryer, which in both cases includes an air duct for channelling a stream of process air to dry the load.
  • the process air circuit is connected with its two opposite ends to the drum. For example, in case of a dryer, hot dehumidified air is fed into the drum, flowing over the laundry, and the resulting humid cool air exits the same. The humid air stream rich in water vapour is then fed into an evaporator of a heat pump, where the moist warm process air is cooled and the humidity present therein condenses.
  • the resulting cool dehumidified air is then either vented outside the appliance in the ambient where the latter is located or it continues in the closed-loop circuit.
  • the dehumidified air in the process air circuit is then heated up before entering again in the drum by means of a condenser of the heat pump, and the whole loop is repeated till the end of the drying cycle.
  • ambient air enters into the drum from the ambient via an inlet duct and it is heated up by the condenser of the heat pump before entering the drum.
  • the process air is preferably blown within the process air circuit by means of a process air fan for example a variable speed fan, driven by a motor.
  • the motor of the fan and the motor of the treating chamber are the same motor. Different circuits are known in the art in case of a washer-dryer.
  • the heat pump of the drying machine includes a refrigerant circuit in which a refrigerant can flow and which connects via piping a first heat exchanger or condenser, a second heat exchanger or evaporator, a compressor and a pressure-lowering device.
  • the refrigerant is pressurized and circulated through the system by the compressor.
  • the hot and highly pressurized vapour is cooled in the first heat exchanger, called the condenser, until it condenses into a high pressure, moderate temperature liquid, heating up the process air before the latter is introduced into the drying chamber.
  • the condensed refrigerant then passes through the pressure-lowering device such as an expansion device, e.g., a choke, a valve or a capillary tube.
  • the low pressure liquid refrigerant then enters the second heat exchanger, the evaporator, in which the fluid absorbs heat and evaporates due to the heat exchange with the warm process air exiting the drum.
  • the refrigerant then returns to the compressor and the cycle is repeated.
  • the compressor preferably includes an electric motor which is commonly powered by a current, for example a current coming from the mains.
  • the drying machine of the invention includes a selector, for example operable by the user, with which a plurality of drying cycles can be alternatively selected.
  • a drying machine generally includes a plurality of drying cycles each designed to treat laundry made of a specific textile type or composition, such as a cotton cycle at high temperature for cotton textile; permanent press, which generally refers to coloured garments and utilizes medium heat; the knits/delicates cycle is for delicate textiles which cannot withstand very much heat; the delicate cycle uses air slightly above room temperature to gently and slowly dry fragile garments, etc. Therefore, generally the cycle is selected depending on the type of textile to be dried.
  • the drying machine of the invention includes an outdoor cycle to properly dry outdoor textiles and re-activate - at least partially - their waterproof qualities.
  • drying cycles can be present in the drying machine of the invention or only two different cycles, among which the outdoor cycle.
  • the cycle which is present and can be selected in the dryer of the invention in addition to the outdoor drying cycle is called "additional drying cycle”.
  • Each cycle can differ from the other cycles by a plurality of different settings, such for example the temperature of the process air which flows inside the drum to dry the textile, the time duration of the cycle, the speed of revolution of the drum, the number of changes in direction of revolution of the drum, the degree of humidity at which the textile is considered to be dry and the cycle terminated, etc. All these settings and the corresponding program lines for each cycle are for example included in a memory of the drying machine, for example in a main controller circuit of the drying machine. Further, each cycle, although preferably not visible to the user, may include one or more settings for the heat pump operation.
  • Each drying cycle includes a main drying phase, which is the phase in which the clothes and/or textile introduced in the drum are dried.
  • the outdoor cycle includes an outdoor main drying phase
  • the cotton drying cycle includes a cotton main drying phase and so on.
  • Each cycle may include also other phases, such as a cooling phase after the main drying phase, in which the laundry is cooled before the user may access them. In the cooling phase, the temperature reached by the textile in the main drying cycle Is reduced.
  • one or more of the drying cycles may include a pre-heating phase where the drum and other components of the drying machine are heated up in order to pre-warm the machine so that it reaches the optimal temperature to start the main drying phase.
  • the selection of a laundry drying cycle or program can be made in any possible way, for example by means of a mechanical switch or a rotatable knob, by means of buttons, one per cycle, by means of a touch screen, etc. Further, the selection can be performed by the user manually, by means of a remote control or by means of a wireless command signal, automatically due to a pre-set timer, etc.
  • the selection of the cycle preferably depends on the type of clothes, garment, textiles, etc. inserted in the drum.
  • the drying cycle starts. For example, if the outdoor cycle is selected because some outdoor textile has been introduced in the drum, the outdoor cycle starts and either immediately or after other phases, the outdoor main drying phase initiates.
  • the outdoor main drying phase is divided in two sub-phases.
  • the first sub-phase has at least one different setting than the second sub-phase, preferably at least two settings, as detailed below.
  • the second sub-phase starts when a value of a parameter indicative of the humidity of the outdoor textile is detected to be equal or below a first threshold.
  • the first threshold indicates that there is at least a certain level of dryness in the textile itself.
  • the laundry is dried at a relatively low temperature, e.g. the temperature of the textile present in the drum commonly does not exceed 50°C-55°C.
  • a relatively low temperature e.g. the temperature of the textile present in the drum commonly does not exceed 50°C-55°C.
  • the water in the outdoor textile is preferably evaporated so that the heat provided by means of the heated process air can be used to increase the temperature of the outdoor textile and not only to evaporate the water contained therein. It is known that the latent heat of water is relatively high and a substantial temperature increase can take place only when the phase change from liquid to vapour is preferably substantially over.
  • the outdoor first sub-phase is a phase of drying the outdoor textile till a first threshold of humidity, below which the "proofing" phase starts, which is the outdoor second sub-phase.
  • the frequency of reversing the rotation of the drum is set lower than a frequency of reversing the rotation in the additional main drying phase.
  • the outdoor second sub-phase starts.
  • the heat introduced by process air is not only transformed in latent heat but may further increase the temperature of the textile itself.
  • the number of reversions of the drum is further decreased with respect to the number of reversions in the outdoor first substep.
  • the reduction in the reversion number may also reduce the mechanical action (such as rubbing) on the textile which is re-activated: the reactivation is most probably a surface phenomenon - such as a cross-linking of polymers of the waterproof layer or a redistribution of the polymers on the surface - and mechanical interference of the surface of the textile may reduce or limit the re-activation process.
  • a further expedient is needed in order to reach and keep the desired relatively high temperature in the outdoor second sub-phase.
  • the expedient may be one of the followings or a combination thereof.
  • a first possibility might be to increase a flow rate of the process air in the drum with respect to a flow rate in the outdoor first sub-phase and with respect to a flow rate in the additional main drying phase.
  • a higher flow rate of the process air indicates that more heat is supplied to the drum and thus a heat transfer of (sensible) heat to the textile may take place at high rate.
  • a second possibility can be to increase a velocity of and/or a power supply to a motor of the compressor with respect to a velocity of and/or a power supply to a motor of the compressor in the outdoor first sub-phase and with respect to a velocity of and/or a power supply to a motor of the compressor in the additional main drying phase.
  • the compressor needs to be a variable speed compressor. Increasing the compressor speed is preferably performed at the same time in which an increase of flow rate takes place, so that the compressor can always work under safe conditions. Variable speed compressors allow to increase to high flow rate the process air flowing in the drum and to obtain a good control of the temperature of the process air.
  • a third possibility can be to increase a temperature at which a cooling device is activated with respect to a temperature at which a cooling device is activated in the outdoor first sub-phase and with respect to a temperature at which a cooling device is activated in the additional main drying phase.
  • the cooling device can be for example a compressor cooling fan apt to blow air towards the compressor.
  • the compressor in order to work in safety conditions, preferably should not overheat, that is, there is a field of working conditions, function of the temperature of the compressor and of the absorbed current of the electric motor of the compressor, in which the compressor can work without overheating.
  • the temperature of the compressor or the temperature of the refrigerant detected in a point of the refrigerant circuit so as to indicate the temperature of the compressor
  • a fan called compressor cooling fan
  • Increasing the temperature at which the fan starts to blow air against the compressor is preferably performed at the same time in which an increase of flow rate in the drum (and thus through the heat exchanger of the heat pump) takes place, so that the compressor can always work under safe conditions.
  • the cooling device could be a different fan. Not cooling the compressor, but cooling for example other components of the laundry drying machine, such as one of the motors.
  • the cooling device could be a conduit leading to the exterior of the laundry drying machine to direct cool air from the ambient outside the machine towards a component of the drying machine which may overheat during functioning.
  • the invention includes in combination or alternatively, one or more of the following characteristics.
  • said outdoor first sub-phase and said outdoor second sub-phase are temporally subsequent to each other, the outdoor first sub-phase being performed first.
  • the outdoor first sub-phase is preferably used to reduce the humidity of the outdoor textile so that the heat transferred to the textile is not only transformed in latent heat but also in sensible heat, so that the temperature of the textile can be more easily increased.
  • the outdoor second sub-phase, or "proofing" phase where a further increase of temperature preferably takes place, may start.
  • the step of entering the outdoor second sub-phase when the humidity of said outdoor textile is equal or below a first threshold includes:
  • the humidity of the outdoor textile can be checked using any know system in the art.
  • the step of detecting a signal function of the humidity of the outdoor textile includes one or more of:
  • the humidity of the outdoor textile present inside the drum can be detected using one (or more) of a plurality of different sensors.
  • a combination of signals provided by different sensors can be used as well.
  • the signal can be a direct humidity signal, for example coming from a sensor measuring a resistance of the laundry which is contacting one or more electrodes located within the drum. A higher degree of dryness corresponds to a higher electrical resistance.
  • the temperature of the process air either at the inlet or at the outlet of the drum, may give an indication of the degree of dryness of the laundry. Further, the temperature of the process air can also be measured at the exit of one of the heat exchanger of the heat pump. The temperature of the refrigerant might also give an indication of the humidity of the outdoor textile in the drum.
  • measuring the level of water in a container where the condense water collects, or the temporal gradient of a level of water removed from the container may also indicate whether the laundry is dry or not: if for example the level of water does not increase for a given time interval, reasonably it means that there is no more water to be removed from the textile in the drum and that the textile is thus substantially dry.
  • the number of activations of a pump driving water removed from the textile contained in the drum to a container may also be representative of the laundry humidity status within the drum.
  • one or more electrical parameters of the drum motor may also indicate the level of humidity of the textile, such as for example the absorbed power. The textile is heavier when water is contained therein and becomes lighter the dryer it is.
  • said heat pump drying machine includes a humidity sensor emitting a humidity signal indicative of the humidity of the textile and wherein the method includes:
  • said outdoor second sub-phase is terminated when the pre-determined minimum duration time has elapsed, regardless of the value of said humidity signal.
  • the humidity sensor might be a sensor performing one or more of the measurements above indicated: it might be an electrode measuring the resistance of the laundry, or a temperature sensor, etc.
  • “ordinary” or “additional” drying cycles that is, in cycles except the outdoor drying cycle, it is rather common that the drying cycle itself terminates when the humidity sensor emits a signal which indicates that the laundry is dry, i.e. its moisture contents is equal or lower than a predetermined amount.
  • the level of dryness at which the cycle is terminated depends generally on the type of selected cycle, for example if an "iron press" cycle has been selected, the cycle is terminated at a humidity of the laundry which is higher than the humidity at which the cotton drying cycle is terminated.
  • each non-outdoor cycle commonly has a "humidity threshold” (second threshold) which, when the humidity lowers below such a threshold, the cycle is ended.
  • second threshold humidity threshold
  • the purpose of the second sub-phase is not to completely dry the textile (which might be already dry), but to regenerate the surface waterproof treatment, at least partially. Therefore, preferably, in the second sub-phase of the outdoor cycle, the signal coming from the humidity sensor is substantially "overruled” and considered again only when the pre-determined minimum duration time has elapsed.
  • This pre-determined minimum duration time may be a constant which is memorized in a memory of the drying machine and stored there during the machine manufacturing. It can be variable, and for example it can be chosen among a plurality of constants, e.g. the proper value of the duration time can be selected among the various duration time available depending on further characteristics of the drying cycle, for example on the weight of the load.
  • said pre-determined minimum duration time may be set depending on temperature and/or pressure ambient conditions of the ambient where said heat pump drying machine is located. For example, the pre-determined duration time is longer in case the temperature of the ambient in which the drying machine is located is rather low or in case the humidity of the ambient in which the drying machine is located is rather high.
  • said pre-determined duration time lasts at least 20 minutes. It has been shown that the minimum amount of time to obtain a regeneration of the waterproof characteristics of the textile is preferably above 20 minutes.
  • said pre-determined minimum duration time is set or adjusted depending on the temperature of the outdoor textile in the outdoor second sub-phase.
  • the outdoor textile temperature and/or a process air temperature indicative of the temperature of the outdoor textile is controlled to be equal or above 55°C.
  • the proofing of the outdoor textiles takes place at temperatures at above 55°C, more preferably at above 59°C. Therefore, such temperatures are reached in the drum of the drying machine of the invention during the outdoor second sub-phase and even more preferably they are kept during the whole, or the majority of the, second sub-phase.
  • said heat pump laundry drying machine includes a process air fan to supply process air to the drum and wherein said additional drying cycle and said outdoor drying cycle includes a cooling phase after said additional main drying phase and said outdoor main drying phase, respectively, wherein the heat pump system (44) is off and the process air fan is on.
  • the outdoor cooling phase lasts at least 10 minutes.
  • a cooling phase is introduced after the main drying phase. In the cooling phase the heat pump system is off and the process air fan is on.
  • said first threshold of humidity is equal or lower than about 5%. More preferably the first threshold is lower than or equal to 4%.
  • the temperature of the textile hardly exceeds a certain value due to the fact that the heat is transferred to latent heat of evaporation. Therefore, preferably the outdoor second sub-phase, where a high temperature is desired, is initiated only when almost all water contained in the textile has evaporated.
  • said second threshold is lower than or equal to about 3%.
  • the textile is considered dry when the humidity of the same falls below 3%.
  • a nominal water content of the outdoor textiles at the end of the outdoor cooling phase is lower than nominal water content of the other textiles after completing the additional cooling stage.
  • the textiles with nominal water content of 0% are defined and obtained by the following two methods alternatively: 1) the textiles are left for a first period of time, preferably at least 72 hours, in an ambient temperature between 18°C to 22°C and an ambient humidity between 60% to 70% when the weight of the textiles changes by less than 0.5% for two successive weightings, which are carried out at two-hour intervals; 2) the textiles are hung singly and separately so that air can freely circulate, and are left in an ambient temperature between 18°C to 22°C and an ambient humidity between 60% to 70% for a second period of time, preferably not less than 48 hours. And percentage values from 0% of nominal water content are calculated as relations between mass of water content and dry weight of the textiles.
  • the frequency of rotation reversion in the outdoor second sub-phase is equal to zero.
  • the frequency of rotation reversion in the outdoor first sub-phase is equal or below 6 reversions per hour.
  • the cooling device is the compressor cooling fan.
  • Fig. 1 shows a perspective outer appearance of an exemplary laundry drying machine 2.
  • the laundry drying machine is a laundry dryer only, but in alternative embodiments the dryer function according to the control method is implemented by a laundry washer-dryer in which the rotatable drum is arranged in a tub and which provides a washing arrangement including (for example) a detergent dispenser, a heater for heating wash liquid and a drain pump for draining out of the liquids.
  • the laundry drying machine 2 has an outer housing 4 or cabinet including a front wall 6. At the front wall 6 a loading opening 8 is provided which is closed by a door 10.
  • the laundry dryer is a front-loading laundry dryer having a horizontal drum rotation axis, but in alternative embodiments the drum may be inclined relative to the horizontal and vertical directions, or the dryer may be a vertical rotation axis dryer in which the drum rotates around a vertical axis and where top-loading is provided.
  • the laundry drying machine 2 has a control panel 12 arranged at the upper region of the front wall 6 and a condensate drawer 14 in which the condensate collected from drying is stored until removal by the user.
  • the drum 16 is arranged inside the housing 4, in which laundry 18 is received.
  • the flow of process drying air A is indicated by the arrows, wherein the drying air A leaves the drum 16 at an outlet 24 and enters a process air channel 20 at the front channel 20c.
  • the process drying air is guided through a fluff filter element 26 towards a second heat exchanger 34 and a first heat exchanger 32.
  • the first and second heat exchangers 32, 34 are arranged in a battery channel 20a of the process air channel 20.
  • the first heat exchanger 32 is a condenser which heats the process drying air
  • the second heat exchanger 34 is an evaporator which cools the process drying air for humidity removal in form of condensed water.
  • the process drying air leaving the first heat exchanger 32 is entering a rear channel 20b in which a drying process air fan 28 is arranged which conveys the drying air.
  • the process air fan 28 is driven by a motor 30, which preferably at same time drives the rotation of the drum 16.
  • the rotation of the drum 16 can be in one direction and also in the opposite direction, that is, reversing the rotation of the drum is possible in the laundry dryer operation, by opportunely driving the drum driving motor.
  • a belt driven by the motor 30 is wound around the drum mantel for driving the fan.
  • the drum and process air fan 28 are driven in a synchronous manner according to the gear ratio.
  • the speed of the drum and/or the process air fan is adjustable.
  • Synchronous rotation of the drum includes a forward and backward rotation according to the motor forward and backward rotation, so that the direction of rotation of the drum can also be changed, form a forward to a backward or vice versa.
  • the fan speed is identical to the motor speed as the process air fan is arranged on an axis of the motor 30, while via the belt the rotation of the motor is gear-reduced in an exemplary ratio of motor rotation speed/drum rotation speed of 50:1.
  • the first and second heat exchangers 32, 34 are part of a heat pump system 44 which further comprises an expansion device 38 and a compressor 36.
  • a refrigerant loop 40 is formed, wherein the refrigerant pumped by the compressor 36 passes first the condenser 32, is forwarded to the expansion device 38 from where it expands into the second heat exchanger 34 and from where it is sucked into the compressor 36.
  • Heat can be removed from the heat pump system (in addition to the heat deposited in the drying air and laundry for drying the laundry) by activating a compressor cooling fan 42 which provides a flow of cooling air from the outside of the cabinet 4 towards the outer surfaces of the compressor 36.
  • the compressor cooling fan can be activated, that is, it can start blowing air against the compressor, for example above a given compressor temperature, and/or it may be deactivated, that is, it may stop blowing air against the compressor, for example below a given compressor temperature. After passing the compressor 36, the cooling air blown by the compressor cooling fan 42 is exhausted out of the cabinet 4.
  • the condensate that is formed at the evaporator 34 flows down and collects in a condensate collector 48.
  • the condensate collector 48 From the condensate collector 48 the condensate is pumped by a draining pump 50 through a drain conduit 52 into the condensate drawer 14 from where it can be removed by the user as mentioned above.
  • the level of water can be measured by means of a level sensor and/or the temporal gradient of a level of water removed from the outdoor textile to be dried and collected can be measured as well.
  • a temperature sensor for example a thermocouple
  • another temperature sensor for example a thermocouple
  • Ti of the drying air At the outlet of the condenser 32 a temperature sensor is provided which detects the refrigerant temperature Tr at this position.
  • electrodes may be present as well to determine the degree of humidity Hum of the laundry when it contacts the electrodes, for example by means of a resistivity measurement.
  • Fig. 3 is a block diagram of components of the dryer 2 that interact for enabling a control unit 60 to control the drying operations or programs.
  • the control unit 60 has a memory 62 in which program parameters and look-up tables are stored such that the control unit, by retrieving corresponding data from the memory 62, can control different basic drying programs preferably under conditions as set by the user via option selectors at the control panel 12.
  • the user can select a program cycle among a list of different program cycles. The selection can be performed by means of a selector (not shown in the drawings and standard per se) in the panel 12.
  • Such user-settable options are for example: the type of drying cycle (cotton, delicate, outdoor, etc.), the final drying degree, the load of the laundry loaded by the user and inputted by him/her, the type of laundry, the duration of drying, an energy option, etc.
  • an outdoor cycle is included, which is preferably selected when outdoor textile is introduced in the laundry 16.
  • each cycle includes a main drying phase and a subsequent cooling phase.
  • a pre-heating phase may be optionally included as well.
  • step S0 the dryer 2 is switched on in step S0 and a drying cycle is selected among those selectable by the selector.
  • the control unit 60 sends control signals to a drum motor inverter 64 and may receive operation parameters therefrom.
  • the drum motor inverter 64 supplies the power to the motor 30 driving the drum 16 and the drying air fan 28.
  • the control unit 60 may send control signals to a compressor motor inverter 66 and may receive operation parameters therefrom.
  • the inverter 66 powers a compressor motor 67 for driving the compressor 36.
  • the control unit 60 may control the draining pump 50, a motor 68 for driving the compressor cooling air fan 42 and optionally, if a separate motor 70 is provided for the drying air fan 28, the drying air fan motor 70.
  • the command signals sent by the control unit 60 depend on the specific settings of the specific program (drying cycle) selected.
  • an additional main drying cycle starts according to any prior art known program - step S1.
  • the settings of the main drying cycle of the additional programs are stored in the memory 62 and they may relate to one or more of: a frequency of the reversion of rotations of the drum 16 during the main drying cycle, to a speed of the process or drying air fan 28, to the temperature level T1 at which the compressor cooling fan 42 activates or deactivates, the speed of the drum 16, the heat pump operation parameters.
  • the control unit 60 monitors not only the signals coming from the motor 30 or its inverter, the compressor cooling fan 42, the compressor motor inverter, the process air fan 28, etc, but also it preferably further monitors the signals coming from one or more sensors, for example it may receive the signals from the sensors for the refrigerant temperature Tr, or for the inlet temperature Ti of the drying air, or for the outlet temperature To of the drying air, or the conductivity measurements Hum made by the electrodes in the drum 16, or the level of water in the condensate collector 48 and/or the temporal gradient of a level of water removed from the outdoor textile to be dried and collected can be measured as well, or relative to the number of activations of the draining pump 50 of the condensate collector 48.
  • the control unit 60 when one or more of these received signals from one or more sensors indicates that a degree of humidity present in the textile present in the drum 16 is below a given threshold (second threshold), preferably for example a content of humidity in the textile is below 3 %, commands the dryer 2 to terminate the main drying cycle. If the degree of humidity is not below this second threshold, then the additional main drying cycle continues. When the main drying cycle terminates, preferably a cooling cycle - step S11 - follows.
  • a given threshold preferably for example a content of humidity in the textile is below 3 %
  • the method of the invention provides the following.
  • the control unit 60 starts the outdoor main drying phase.
  • additional phases may be present, for example an outdoor pre-heating phase.
  • the outdoor main drying phase starts with the outdoor first sub-phase, step S2.
  • the control unit 60 thus sends command signals to the drum motor inverter 64 so that a frequency F1 of reversion of rotations of the drum 16 is reduced with respect to an additional cycle present in the memory 62 of the control unit 60.
  • the frequency F1 is lower than the frequency of any other cycle stored in the memory 62 and selectable by the selector.
  • the frequency F1 is selected to be equal to 6 reversions per hour.
  • the number of revolutions per minute RPM1 of the motor driving the drum 16 in the outdoor first sub-phase may be increased with respect to the rpm present in the main drying phase of the additional drying cycle by means of command signals sent by the control unit 60 to the drum motor inverter 64, so as to increase the flow rate of process air in the drum 16.
  • the RPM1 can be of about 2750 rpm or 2900 rpm.
  • the control unit 60 may send command signals to the drying air fan motor 70, 30 to increase its velocity with respect to a velocity in the additional drying cycle selectable in the selector.
  • control unit 60 may send command signals to the compressor cooling fan motor 68 in order to increase the temperature T1 at which the compressor cooling fan 42 activates/deactivates with respect to a temperature at which the compressor cooling fan activates/deactivates in the additional drying cycle selectable by the selector.
  • control unit 60 may send command signal to the compressor motor inverter 66 so as to increase the velocity of or the power supply to the motor 67 of the compressor 36 with respect to the velocity in the additional main drying cycle.
  • the first outdoor sub-phase then takes place with the settings above indicated.
  • the control unit 60 further monitors the signals coming from one or more sensors, for example it may receive the signals from the sensors for the refrigerant temperature Tr, or for the inlet temperature Ti of the drying air, or for the outlet temperature To of the drying air, or the conductivity measurements Hum made by the electrodes in the drum 16, or the level of water in the condensate collector 48.
  • the control unit 60 when one or more of these signals indicate a degree of humidity present in the outdoor textile below a first threshold, preferably for example a humidity below 5 %, commands the drying machine 2 to enter the second sub-phase of the outdoor main drying cycle. If the degree of humidity of the outdoor is not below this first threshold, then the outdoor first sub-phase continues.
  • step S3 the control unit 60 thus sends command signals to the drum motor inverter 64 so that the frequency F2 of reversion of rotations of the drum 16 is reduced with respect to the outdoor first sub-phase.
  • the frequency F2 is lower than the frequency of any other program in the memory 62 selectable by the selector.
  • the frequency F2 is selected to be equal to zero.
  • the number of revolutions per minute RPM2 of the motor driving the drum 16 may be increased with respect to the outdoor first sub-phase by means of the control unit 60 sending command signals to drum motor inverter 64. This is particularly advantageous when the drum 16 and the fan 28 are driven by the same motor 30 because the flow rate of process air in the drum 16 is increased.
  • the RPM can be of about 3000 rpm.
  • the control unit 60 may send command signals to the drying air fan motor 70 to increase its velocity with respect to a velocity in the outdoor first sub-phase.
  • control unit 60 may send command signals to the compressor cooling fan motor in order to increase the temperature T2 at which the compressor cooling fan 42 activates with respect to a temperature at which it activates in the outdoor first sub-phase.
  • control unit 60 may send command signals to the compressor motor inverter 66 so as to increase the velocity of or the power supply to the motor of the compressor 36 with respect to the velocity of or the power supply to the motor of the compressor in the outdoor first sub-phase.
  • control unit 60 receives a signal from any of the above described sensors indicating that the humidity of the outdoor textile has further lowered, for example below the second threshold at which the additional main drying cycle ends, the control unit 60 does not end the outdoor first or second sub-phase unless the following additional condition is verified.
  • the second sub-phase of the outdoor main drying phase terminates when the outdoor sub-phase has lasted at least for a predetermined duration time t1set.
  • This time interval can be constant, that is, in the memory 62 a fixed value of the t1set is present, or it may change.
  • this duration time may be adjusted depending on the amount of time at which the outdoor textile inside the drum 16 exceeds a temperature threshold Tthr which is preferably of about 59°C.
  • Tthr which is preferably of about 59°C.
  • the outdoor second sub-phase is terminated when a duration time t1set has elapsed, where t1set depends on how much time the temperature of the outdoor textile during the second sub-phase exceeds Tthr.
  • this t1set is constantly updated during the cycle and only the fraction of the time during which the temperature of the outdoor textile is above Tthr is considered.
  • the second sub-phase therefore terminates when the t1set is elapsed thereby ensuring that the time during which the temperature of outdoor textiles is above Tthr is sufficiently long to re-activate (or "re-proof") the water repellent characteristics of outdoor textiles.
  • this t1set can be set depending on the ambient temperature and/or pressure conditions of the ambient in which the drying machine 2 is located, for example at the beginning of the outdoor cycle several parameters of the ambient are sensed and a corresponding fixed value of the t1set is selected, for example from a look-up table or curve of t1set vs. ambient conditions present in the memory 62 of the control unit 60.
  • step S4 a cooling phase may start, step S4, in order to cool the outdoor textile which has reached relatively high temperatures due to the re-activation phase (second sub-phase).
  • the cooling phase preferably lasts for more than 10 minutes.
  • Figure 4 shows the temporal behaviour of several parameters during an outdoor cycle in a drying machine 2 of the invention.
  • an outdoor cycle has been selected.
  • the division between the main drying phase and the cooling phase has been depicted, as a first vertical line which divides the first and the second sub-phase of the main drying phase, and the division between the main drying phase and the cooling phase is shown as well as another vertical line.
  • the graph only the behaviour over time of the curves has been depicted, in order to show the overall curve shape, the units used are arbitrary.
  • the depicted graphs represent the following signal (from top to bottom):
  • the temperature in the outdoor first sub-phase constantly increases and in the outdoor second sub phase is substantially kept constant at a high value.

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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)

Claims (16)

  1. Procédé de commande d'un sèche-linge à pompe à chaleur (2), le sèche-linge à pompe à chaleur comprenant :
    un tambour rotatif (16) dans lequel du textile est introduit et traité avec de l'air de processus (A), ledit tambour étant entraîné dans deux sens de rotation ;
    un système de pompe à chaleur (44) comprenant un circuit de fluide frigorigène (40) dans lequel un fluide frigorigène peut circuler, ledit circuit de fluide frigorigène comprenant un premier échangeur de chaleur (32) dans lequel le fluide frigorigène est refroidi, un second échangeur de chaleur (34) dans lequel le fluide frigorigène est chauffé, un compresseur (36) pour pressuriser et faire circuler le fluide frigorigène dans le circuit de fluide frigorigène (40) ; ledit premier et/ou ledit second échangeur de chaleur étant aptes à réaliser un échange de chaleur entre ledit fluide frigorigène circulant dans ledit circuit de fluide frigorigène et ledit air de processus ;
    un dispositif de refroidissement (42) pour refroidir un composant (36) du système de pompe à chaleur ;
    un sélecteur conçu pour sélectionner alternativement au moins un cycle de séchage de textile d'extérieur pour sécher des textiles d'extérieur qui ont une matière de film fin imperméable à l'eau et perméable à l'air avec une structure micro-poreuse, et au moins un cycle de séchage supplémentaire pour sécher d'autres types de textiles, le cycle de séchage de textile d' extérieur comprenant une phase de séchage principale de textile d'extérieur comportant des réglages pour une fréquence d'inversion de rotations du tambour et pour le fonctionnement de la pompe à chaleur, et le cycle de séchage supplémentaire comprenant une phase de séchage principale supplémentaire comportant des réglages pour une fréquence d'inversion de rotations du tambour et pour le fonctionnement de la pompe à chaleur ;
    le procédé étant caractérisé par les étapes consistant à :
    sélectionner et démarrer le cycle de séchage de textile d'extérieur, et entrer dans la phase de séchage principale de textile d'extérieur, la phase de séchage principale de textile d'extérieur comprenant une première sous-phase pour textile d'extérieur (S2) au cours de laquelle l'humidité des textiles d'extérieur est réduite, et une seconde sous-phase pour textile d'extérieur (S3) au cours de laquelle la température des textiles d'extérieur et/ou une température d'air de processus représentative de la température des textiles d'extérieur sont régulées pour être supérieures ou égales à 55 °C ;
    inverser la rotation du tambour (16) dans la première sous-phase pour textile d'extérieur à une fréquence (F1) inférieure à une fréquence dans la phase de séchage principale supplémentaire ;
    entrer dans la seconde sous-phase pour textile d'extérieur quand l'humidité dudit textile d'extérieur est inférieure ou égale à un premier seuil ;
    dans la seconde sous-phase, inverser la rotation du tambour à une fréquence (F2) inférieure à la fréquence d'inversion de rotation de tambour (F1) utilisée dans la première sous-phase pour textile d'extérieur ; et appliquer une ou plusieurs des étapes suivantes consistant à :
    augmenter un débit de l'air de processus dans le tambour par rapport à un débit dans la première sous-phase pour textile d'extérieur et par rapport à un débit dans la phase de séchage principale supplémentaire ;
    augmenter une vitesse et/ou une alimentation d'un moteur (67) du compresseur (36) par rapport à une vitesse et/ou une alimentation d'un moteur du compresseur dans la première sous-phase pour textile d'extérieur et par rapport à une vitesse et/ou une alimentation d'un moteur du compresseur dans la phase de séchage principale supplémentaire ;
    augmenter une température à laquelle le dispositif de refroidissement (42) est activé/désactivé par rapport à une température à laquelle le dispositif de refroidissement est activé/désactivé dans la première sous-phase pour textile d'extérieur et par rapport à une température à laquelle le dispositif de refroidissement est activé/désactivé dans la phase de séchage principale supplémentaire.
  2. Procédé selon la revendication 1, dans lequel l'étape consistant à entrer dans la seconde sous-phase pour textile d'extérieur quand l'humidité dudit textile d'extérieur est inférieure ou égale à un premier seuil consiste à :
    détecter un signal représentatif de l'humidité du textile d'extérieur.
  3. Procédé selon la revendication 2, dans lequel l'étape consistant à détecter un signal représentatif de l'humidité du textile d'extérieur comprend une ou plusieurs des étapes suivantes consistant à :
    détecter un signal conductimétrique (Hum) à partir d'un capteur indiquant la résistance électrique du textile d'extérieur ;
    détecter une température du flux d'air de processus quittant le tambour (16) ;
    détecter une température du fluide frigorigène circulant dans le circuit de fluide frigorigène (40) de la pompe à chaleur (44) ;
    détecter une température de l'air de processus quittant le premier ou second échangeur de chaleur (32, 34) de la pompe à chaleur (44) ;
    détecter un niveau et/ou le gradient temporaire d'un niveau d'eau éliminée du textile d'extérieur à sécher et collectée dans un récipient d'eau ;
    détecter un paramètre électrique d'un moteur entraînant le tambour rotatif ;
    détecter le nombre d'activations d'une pompe entraînant dans un récipient l'eau éliminée du textile d'extérieur.
  4. Procédé selon l'une quelconque des revendications précédentes, dans lequel ledit sèche-linge à pompe à chaleur (2) comprend un capteur d'humidité émettant un signal d'humidité (Hum, Ti, To, Tr) représentatif de l'humidité du textile, et le procédé consistant à :
    quand ledit cycle de séchage supplémentaire est sélectionné, terminer ledit cycle de séchage principal supplémentaire quand ledit signal d'humidité est inférieur ou égal à un second seuil ;
    quand ledit cycle de séchage de textile d'extérieur est sélectionné, terminer ladite seconde sous-phase pour textile d'extérieur quand une durée minimale prédéterminée (t1set) s'est écoulée.
  5. Procédé selon la revendication 4, dans lequel ladite durée minimale prédéterminée (t1set) est réglée selon des conditions de température et/ou de pression de l'air ambiant où se situe ledit sèche-linge à pompe à chaleur (2).
  6. Procédé selon la revendication 4 ou 5, dans lequel ladite durée minimale prédéterminée (t1set) dure au moins 20 minutes.
  7. Procédé selon l'une quelconque des revendications 4 à 6, dans lequel ladite durée minimale prédéterminée (t1set) est réglée ou ajustée selon la température du textile d'extérieur dans la seconde sous-phase pour textile d'extérieur.
  8. Procédé selon l'une quelconque des revendications précédentes, dans lequel ledit sèche-linge à pompe à chaleur (2) comprend un ventilateur d'air de processus (28) pour alimenter le tambour (16) en air de processus, et dans lequel ledit cycle de séchage supplémentaire et ledit cycle de séchage de textile d'extérieur comprennent une phase de refroidissement (S4, S11) après respectivement ladite phase de séchage principale supplémentaire et ladite phase de séchage principale de textile d'extérieur, le système de pompe à chaleur (44) étant éteint et le ventilateur d'air de processus (28) étant allumé.
  9. Procédé selon la revendication 8, dans lequel la phase de refroidissement de textile d'extérieur (S4) dure au moins 10 minutes.
  10. Procédé selon l'une quelconque des revendications précédentes, dans lequel ledit premier seuil d'humidité est inférieur ou égal à environ 5 %.
  11. Procédé selon l'une quelconque des revendications précédentes, en dépendance de la revendication 4, dans lequel ledit second seuil d'humidité est inférieur ou égal à environ 3 %.
  12. Procédé selon l'une quelconque des revendications précédentes, en dépendance de la revendication 4, dans lequel une teneur nominale en eau des textiles d'extérieur à la fin de la phase de refroidissement de textile d'extérieur est inférieure à une teneur nominale en eau des autres textiles après l'achèvement de l'étape de refroidissement supplémentaire.
  13. Procédé selon l'une quelconque des revendications précédentes, dans lequel la fréquence (F2) d'inversion de rotation dans la seconde sous-phase pour textile d'extérieur est égale à zéro.
  14. Procédé selon l'une quelconque des revendications précédentes, dans lequel la fréquence (F1) d'inversion de rotation dans la première sous-phase pour textile d'extérieur est inférieure ou égale à 6 inversions par heure.
  15. Procédé selon l'une quelconque des revendications précédentes, dans lequel, dans la première sous-phase pour textile d'extérieur, se produisent une ou plusieurs des étapes suivantes consistant à :
    produire un débit d'air de processus de l'air de processus dans le tambour (16) supérieur à un débit d'air de processus dans la phase de séchage principale supplémentaire ;
    entraîner un moteur (67) du compresseur (36) avec une vitesse et/ou une alimentation supérieures à une vitesse et/ou une alimentation entraînant le même moteur dans la phase de séchage principale supplémentaire ;
    régler une température à laquelle un dispositif de refroidissement (42) est activé/désactivé, qui est supérieure à une température à laquelle un dispositif de refroidissement est activé/désactivé dans la phase de séchage principale supplémentaire.
  16. Sèche-linge caractérisé par une unité de commande qui commande ledit sèche-linge selon le procédé selon l'une quelconque des revendications 1 à 15.
EP15203019.3A 2015-12-29 2015-12-29 Procédé pour commander une machine de séchage de linge de pompe à chaleur Active EP3187652B1 (fr)

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EP3425107B1 (fr) * 2017-07-07 2020-06-17 Electrolux Appliances Aktiebolag Procédé pour commander une machine de séchage de linge à pompe à chaleur
CN110055731A (zh) * 2019-04-04 2019-07-26 青岛海尔洗衣机有限公司 一种衣物处理设备的温度控制方法及热泵式衣物处理设备
EP4212664A1 (fr) 2022-01-18 2023-07-19 BSH Hausgeräte GmbH Séchoir avec une pompe à chaleur et un réservoir d'eau comprenant une électrode et son procédé de fonctionnement

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US3401052A (en) * 1966-03-01 1968-09-10 Minnesota Mining & Mfg Method and apparatus for waterproofing textiles
US6493963B1 (en) * 2001-05-25 2002-12-17 Maytag Corporation Method and apparatus for dryness detection in a clothes dryer
CN100436700C (zh) * 2003-12-08 2008-11-26 松下电器产业株式会社 衣物干燥装置
CN102418259B (zh) * 2010-09-28 2015-11-25 博西华电器（江苏）有限公司 干衣机的控制方法

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