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US20240167215A1 - Condenser tumble dryer having a heat pump and a recirculated air portion and method for the operation thereof - Google Patents

Condenser tumble dryer having a heat pump and a recirculated air portion and method for the operation thereof Download PDF

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Publication number
US20240167215A1
US20240167215A1 US18/549,962 US202218549962A US2024167215A1 US 20240167215 A1 US20240167215 A1 US 20240167215A1 US 202218549962 A US202218549962 A US 202218549962A US 2024167215 A1 US2024167215 A1 US 2024167215A1
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United States
Prior art keywords
condenser
air
air channel
tumble dryer
drum
Prior art date
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Application number
US18/549,962
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English (en)
Inventor
Alvaro Harbach
Martin Korte
Andreas Stolze
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Assigned to BSH HAUSGERAETE GMBH reassignment BSH HAUSGERAETE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HARBACH, ALVARO, KORTE, MARTIN, STOLZE, ANDREAS
Publication of US20240167215A1 publication Critical patent/US20240167215A1/en
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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
    • D06F58/00—Domestic laundry dryers
    • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
    • 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
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/26—Condition of the drying air, e.g. air humidity or 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/24—Condensing arrangements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/32—Temperature
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/34—Humidity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/28—Air properties
    • D06F2103/36—Flow or velocity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • 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
    • D06F2105/30—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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/32—Air flow control means
    • 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
    • D06F2105/36—Condensing arrangements, e.g. control of water injection therefor
    • 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
    • D06F58/48—Control of the energy consumption

Definitions

  • the invention relates to a condenser tumble dryer having a heat pump and a recirculated air portion and a method for the operation thereof.
  • the invention relates, in particular, to a condenser tumble dryer having a drum for laundry items to be dried, a supply air channel, an exhaust air channel, a recirculated air channel branching off therefrom and discharging into the supply air channel upstream of a drum inlet, a blower, a heat pump having a condenser which is arranged in the supply air channel, an evaporator which is arranged in the exhaust air channel, a throttle and a compressor, as well as a control facility and a heating facility; as well as a preferred method for the operation thereof.
  • Generally tumble dryers are operated as exhaust air dryers or condenser tumble dryers.
  • Condenser tumble dryers the mode of operation thereof being based on the condensation of the moisture from the laundry which has been evaporated by means of warm process air, permit an energy recovery from the heated process air, for example by using a heat pump.
  • the condensate arising in the condenser tumble dryer is collected and either pumped out or disposed of by manually emptying a collection container.
  • the tumble dryer consists of a moving container which receives the laundry and into which a supply air flow heated by a heating element discharges, while the moist warm air is routed as exhaust air via an outlet.
  • a heat exchanger through which the moist warm exhaust air flows from the container, is arranged in the supply air flow upstream of the heating element.
  • the publication DE 197 31 826 A1 describes a tumble dryer having a system for heat recovery (for example a heat pump) in which the substantially closed air circuit can exchange the circulating air with the room air at two predetermined points through two openings, in order to keep the drying temperature and the condensation temperature at the predetermined values.
  • a system for heat recovery for example a heat pump
  • a tumble dryer having a heat pump circuit is described in the publication DE 40 23 000 C2, in which a supply air opening which can be closed by a controllable closure apparatus is arranged in the process air channel between the condenser and the evaporator.
  • the publication DE 43 06 217 B4 describes a program-controlled tumble dryer having a laundry drum in which the process air is conveyed through the laundry drum by means of a blower in a closed process air channel which has closure facilities.
  • the tumble dryer also has a heat pump circuit consisting of an evaporator, compressor and condenser designed for precipitating the moisture in the process air from the laundry drum.
  • the closure facilities are arranged such that the process air is routed as a function of a process phase.
  • an exhaust air dryer having a heat pump heat is removed from the exhaust air from the drying chamber, generally a drum, by the evaporator of the heat pump, the heat being supplied back to the supply air via the condenser. Since the exhaust air dryer is an open system, in contrast to a condenser tumble dryer with a closed process air circuit, sensible heat is also recovered in addition to the latent heat. As a result, in spite of a condensation efficiency of, for example, less than 50% an exhaust air dryer with heat recovery can have a lower energy consumption than a condenser tumble dryer.
  • the publication DE 103 49 712 A1 describes a method for drying laundry in a tumble dryer having a program control facility, a drying chamber and a process air channel in which a blower for conveying the dry air through the drying chamber and a heating facility are arranged, wherein the process air channel is configured with a fresh air supply and an exhaust air discharge and wherein means are arranged in the process air channel for separating the dry air flow into an exhaust air portion and a recirculated air portion.
  • the publication DE 34 46 468 A1 describes a method for drying laundry in a tumble dryer having a drivable laundry drum, a blower, a heater arranged in the flow path of the drying air and a cooled condenser via which the drying air is routed after exiting from the laundry drum, wherein after exiting from the laundry drum the drying air is split into two partial air flows.
  • the one partial air flow is supplied to the condenser and the other partial air flow is mixed again with the partial air flow exiting from the condenser, bypassing the condenser.
  • the publication DE 34 19 743 C2 describes a tumble dryer having a laundry drum, a heating unit provided with a supply air connection and an exhaust air connection, wherein various additional units which determine the mode of operation of the tumble dryer can be arranged to be switchable between the supply air connection of the heating unit and the exhaust air connection.
  • a recirculation part in which an air control facility is located, is interposed between the supply air connection piece and the exhaust air connection piece, whereby the ratio between the supply air and the exhaust air of the tumble dryer can be varied.
  • the publication DE 10 2007 042969 A1 describes a tumble dryer having a drying chamber for objects to be dried, a process air channel, a heater for heating the process air and a blower for routing the heated process air from a supply air inlet through the drying chamber to an exhaust air outlet, and at least one heat exchanger, being located therein.
  • the heat exchanger is arranged between the drying chamber and the exhaust air outlet.
  • a recirculated air channel branches off from the process air channel downstream of the drying chamber, a part of the process air being able to be routed through this recirculated air channel to the heater.
  • the at least one heat exchanger can be formed by an evaporator and a condenser of a heat pump.
  • a subject of the invention is thus a condenser tumble dryer having a drum for receiving laundry items to be dried, a supply air channel, an exhaust air channel, a recirculated air channel branching off therefrom and discharging into the supply air channel upstream of a drum inlet, a blower, a heat pump having a condenser which is arranged in the supply air channel, an evaporator which is arranged in the exhaust air channel, a throttle and a compressor, as well as a control facility and a heating facility, wherein the condenser tumble dryer is designed such that, in a drying program carried out therein, moist warm process air flows out of the drum in an exhaust air channel part defined downstream by the evaporator, substantially in the same direction as the supply air in an inlet region of the supply air channel containing the condenser, and the process air leaving the drum has a relative air humidity F rel , to which F rel min ⁇ F rel ⁇ F rel max applies, wherein F rel min is a predetermined minimum value and
  • the air status at the drum outlet is influenced by the size of the air volume flow, by the temperature in the drum and the relative air humidity of the process air at the drum inlet, the air routing through the drum and the laundry load and the type of laundry.
  • the relative air humidity is an indirect measurement of the portion of sensible heat of the process air.
  • the sensible heat and energy is recovered and the drying speed increased thereby, but for a high condensation efficiency this portion should be small relative to the latent heat.
  • an additional heat exchanger for fulfilling the condensation efficiency for example a sub-cooler, can thus be smaller.
  • the efficiency of the condenser tumble dryer increases in the present invention.
  • the water load of the process air increases upstream or downstream of the condenser.
  • the relative air humidity at the drum inlet becomes greater, as does that of the process air at the drum outlet.
  • the recirculated air channel discharges into the supply air channel in the direction of flow of the supply air downstream of the condenser.
  • the recirculated air channel discharges into the supply air channel in the direction of flow of the supply air upstream of or at the condenser, i.e. it leads to increased air flow through the condenser.
  • a flow measuring facility is arranged in the supply air channel upstream and downstream of the condenser.
  • a flow measuring facility is arranged in the supply air channel upstream and downstream of the condenser.
  • a condenser tumble dryer is quite particularly preferred in which the exhaust air channel part and the condenser have a common wall which has a plurality of holes which form the recirculated air channel. It is also preferred here that the plurality of holes is located in an inlet region of the condenser.
  • the shape and number of the holes is not limited, provided a desired recirculated air portion according to the invention can be produced by this plurality of holes.
  • a condenser tumble dryer is preferred in which the plurality of holes is configured in a drying program carried out in the condenser tumble dryer in cooperation with the blower to form an air volume flow through the condenser, such that it consists of 15 to 50% by volume, preferably 20 to 40% by volume, of recirculated air.
  • the air volume flow via the condenser which is significantly increased relative to the evaporator, also leads to the improvement of the efficiency of the heat pump. With an unchanged efficiency, the heat exchanger, in particular also an additional heat exchanger, can have smaller dimensions. If the air volume flow via the condenser is not increased, however, the volume flow of the supply air and exhaust air is reduced, with the result that with the same efficiency the noise level of the condenser tumble dryer is lowered.
  • an increase in the recirculated air portion can be implemented, for example, by the blower output and thus a conveying capacity of the blower being increased.
  • the increase in the blower output leads to an increase in the negative pressure in the supply air channel and an increase in the positive pressure in the exhaust air channel. This results in an increase in the pressure difference for the passage of process air from the drum or the exhaust air channel into the supply air channel, in particular into the inlet region of the condenser.
  • the condenser tumble dryer can advantageously have an apparatus which permits a total effective opening surface of the plurality of holes to be controlled.
  • an apparatus can be designed, for example, to cover some holes entirely or partially, wherein the covering can also be implemented, for example, by a foam which is partially permeable to air and which hinders the passage of air.
  • a further covering option is in the use of an adjustable blind.
  • the heat pump contains an additional cooler which is also denoted as a sub-cooler.
  • the mode of operation of the heat pump can be better controlled and, in particular, the overheating thereof prevented.
  • the present invention makes it possible to avoid the use of an additional cooler. This is the case if the portion of process air in the recirculated air channel, which in the embodiments of the invention passes directly into the condenser, is sufficiently great. In an alternative further preferred embodiment of the invention, therefore, the heat pump does not contain an additional cooler.
  • a condenser tumble dryer is preferred in which a relationship between a rotational speed u of the blower and a ratio r between an air flow speed V C in the condenser and an air flow speed V E in the evaporator is stored in the control facility. This permits an improved control of the portion of recirculated air in the condenser tumble dryer according to the invention.
  • a condenser tumble dryer is also preferred in which a humidity sensor is arranged at the outlet of the drum for determining the relative air humidity F rel of the process air leaving the drum.
  • a humidity sensor is arranged at the outlet of the drum for determining the relative air humidity F rel of the process air leaving the drum.
  • Adjustable closure apparatuses can be located in the individual channels, such as the supply air channel, the recirculated air channel and the exhaust air channel, in order to improve the control of the air flows and, in particular, the portion of supply air in an air flow through the condenser.
  • flaps can be used as adjustable closure apparatuses which can be opened to different degrees independently of one another or as a function of one another.
  • the tumble dryer preferably comprises an electrical heating apparatus so that process air can be heated by means of the condenser and also by means of the electrical heating apparatus. Since the energy required for the drying decreases with the progressive degree of drying of the laundry items to be dried in the condenser tumble dryer, it is expedient to adjust the heating apparatus correspondingly, i.e. to reduce the heating power thereof with a progressive degree of drying. In the condenser tumble dryer of the present invention, with the presence of an evaporator inlet temperature which is too high, the recirculated air portion can also be reduced as a function of the temperature.
  • the air temperature upstream of the heating apparatus is raised. Due to the increased air flow via the heating apparatus, however, the drum inlet temperature can remain in a permissible range.
  • the quantity of supply air in the supply air channel can be controlled, for example by using adjustable closure apparatuses, such that in a starting phase of a drying program the supply of supply air is stopped and the condenser tumble dryer is operated only with recirculated air as the process air.
  • exhaust air, supply air and/or refrigerant are routed in each case in a cross-flow or counter-flow method through the corresponding heat exchangers.
  • the evaporator of the heat pump is located in the exhaust air channel in order to remove heat from the moist warm air from the drum, which generally flows into an installation space via the exhaust air channel.
  • the warm moisture-laden process air is substantially cooled in the evaporator of the heat pump, wherein the transmitted heat is used for the evaporation of a refrigerant introduced into the heat pump circuit.
  • the refrigerant of the heat pump which is evaporated by being heated, is supplied via a compressor to the condenser of the heat pump, where heat is released due to the condensation of the gaseous refrigerant, the heat being used for heating the process air or the supply air upstream of the inlet into the drying chamber.
  • the blower is preferably arranged directly downstream of the condenser or directly upstream of the condenser.
  • a further subject of the invention is a method for operating a condenser tumble dryer having a drum for receiving laundry items to be dried, a supply air channel, an exhaust air channel, a recirculated air channel branching off therefrom and discharging into the supply air channel upstream of a drum inlet, a blower, a heat pump having a condenser which is arranged in the supply air channel, an evaporator which is arranged in the exhaust air channel, a throttle and a compressor, as well as a control facility and a heating facility, wherein the condenser tumble dryer is designed such that, in a drying program carried out therein, moist warm process air flows out of the drum in an exhaust air channel part defined downstream by the evaporator, substantially in the same direction as the supply air in an inlet region of the supply air channel containing the condenser, and the process air leaving the drum has a relative air humidity F rel , to which F rel min ⁇ F rel ⁇ F rel max applies, wherein F rel min is a
  • the expression “flows substantially in the same direction” is intended to be understood to take into account that the recirculated air portion, i.e. the portion of process air which, in embodiments of the invention, flows through the plurality of holes as an embodiment of the recirculated air channel used according to the invention, takes place transversely to this direction or even vertically and thus influences the flow in the exhaust air channel and recirculated air channel.
  • the recirculated air portion i.e. the portion of process air which, in embodiments of the invention, flows through the plurality of holes as an embodiment of the recirculated air channel used according to the invention, takes place transversely to this direction or even vertically and thus influences the flow in the exhaust air channel and recirculated air channel.
  • the blower is controlled by the control facility such that an air volume flow through the condenser consists of 15 to 50% by volume, preferably 20 to 40% by volume, of recirculated air.
  • a method is also preferred in which a ratio r between an air flow speed V C in the condenser and an air flow speed V E in the evaporator is greater than 1, preferably greater than 1.2.
  • the method according to the invention is preferably carried out after the process air leaving the drum has reached a predetermined minimum temperature. At this time, generally a very high relative air humidity F rel is present at the drum outlet, preferably even a maximum relative air humidity F rel max .
  • the invention thus makes it possible to maintain such a high relative air humidity.
  • the method according to the invention is thus preferably carried out in a main drying phase.
  • the relative air humidity F rel of the process air leaving the drum is reduced.
  • an increase in the relative air humidity F rel can be very advantageously achieved at the drum outlet, for example by increasing the rotational speed u of the blower.
  • the loading with laundry items also has an influence on the relative air humidity F rel of the process air.
  • a loading of the drum with laundry items is also determined in a manner known per se.
  • a relationship between the loading and F rel min or F rel max can be stored in the control facility, so that these values can be set in a more targeted manner.
  • the condenser tumble dryer according to the invention and the method according to the invention have the advantage that the condenser tumble dryer can be operated in an energy-efficient manner with a high condensation efficiency.
  • the efficiency and/or the noise level of the condenser tumble dryer can be improved in the condenser tumble dryer according to the invention which has an open air system, a heat pump for heat recovery and also a portion of the process air which branches off from the drum downstream of the outlet and which is supplied back as recirculated air upstream or downstream of the condenser.
  • FIGS. 1 to 7 Further details of the invention are found in the following description of non-limiting exemplary embodiments of the condenser tumble dryer according to the invention and a method using this condenser tumble dryer. Reference is made to FIGS. 1 to 7 .
  • FIG. 1 shows a perspective view of a condenser tumble dryer from the prior art having a heat pump, wherein no supply air channel is used for partially returning process air from the drum.
  • FIG. 2 shows a vertical section through the condenser tumble dryer of FIG. 1 in which the air routing through the supply air channel, drum and exhaust air channel is shown.
  • FIG. 3 shows a vertical section through a condenser tumble dryer according to the invention according to a first embodiment in which a part of the process air from the drum is supplied via a recirculated air channel to a condenser in the supply air channel.
  • FIG. 4 shows as FIG. 3 a vertical section through the condenser tumble dryer according to the invention, according to a first embodiment in which a part of the process air from the drum is supplied via a recirculated air channel to a condenser in the supply air channel.
  • arrows which indicate the flow of air in the 2 condenser tumble dryer are not present here.
  • FIG. 5 shows a diagram which shows the flow of process air through the condenser, the drum, the evaporator and a sub-cooler according to a second embodiment of the condenser tumble dryer according to the invention (thick arrows), wherein the thin arrows show the flow of a refrigerant through the components of the heat pump used.
  • FIG. 6 shows a diagram which shows the flow of process air through the condenser, the drum, the evaporator and a sub-cooler according to a third embodiment of the condenser tumble dryer according to the invention (thick arrows), wherein the thin arrows show the flow of a refrigerant through the components of the heat pump used.
  • FIG. 7 shows a perspective plan view of a lower part of a condenser tumble dryer used according to the invention, in which in particular a common wall separating the condenser from the exhaust air channel can be seen, the wall having a plurality of holes which can function as a recirculated air channel in an inlet region of the condenser.
  • FIG. 1 shows a perspective view of a condenser tumble dryer 1 from the prior art having a heat pump, the condenser 8 and the evaporator 9 being able to be identified therefrom.
  • this condenser tumble dryer no supply air channel is used for the partial return of process air from the drum 2 .
  • the air routing through the condenser tumble dryer is illustrated by the arrows.
  • the light arrow indicates supply air from an installation space of the condenser tumble dryer which is conveyed in the supply air channel 3 by the use of a blower, not shown here.
  • This supply air is heated in the condenser 8 and the now warm process air is then forwarded to and into the drum 2 .
  • the now moist warm process air leaves the drum 2 at the drum outlet 18 .
  • the process air has relatively the highest temperature, which is shown by the black arrows.
  • the moist warm process air is cooled by condensation (not shown here) of the moisture in the evaporator 9 and conveyed in the exhaust air channel 4 into an installation space of the condenser tumble dryer 1 . 17 indicates a sub-cooler in the heat pump circuit.
  • FIG. 2 shows a vertical section through the condenser tumble dryer 1 of FIG. 1 , in which the air routing through the supply air channel 3 , drum 2 and exhaust air channel 4 is shown.
  • the same reference signs have the same meaning as in FIG. 1 . 7 indicates a blower.
  • FIG. 3 shows a vertical section through a condenser tumble dryer 1 according to the invention, according to a first embodiment in which a part of the process air from the drum 2 is supplied via a recirculated air channel 5 to a condenser 8 in the supply air channel 3 .
  • the recirculated air channel 5 here is located in an inlet part 13 of the supply air channel 3 .
  • 12 indicates an exhaust air channel in which the process air substantially flows in the same direction as in the supply air channel, i.e. in particular in the condenser 8 .
  • 7 indicates a blower and 17 a sub-cooler.
  • the thick arrow which is split into two illustrates how a part of the moist warm process air from the drum 2 downstream of the drum outlet 18 in the region of the condenser 8 is conducted therein as recirculated air.
  • FIG. 4 shows as FIG. 3 a vertical section through the condenser tumble dryer 1 according to the invention, according to a first embodiment in which a part of the process air from the drum 2 is supplied via a recirculated air channel 5 to a condenser 8 in the supply air channel 3 .
  • arrows which show the flow of air in the condenser tumble dryer 1 are not present here. Further reference signs have the same meaning as in FIG. 3 .
  • FIG. 5 shows a diagram which shows the flow of process air through the condenser 8 , the drum 2 , the evaporator 8 and a sub-cooler 17 according to a second embodiment of the condenser tumble dryer 1 according to the invention (thick arrows), wherein the thin arrows show the flow of a refrigerant through the components of the heat pump used.
  • the refrigerant is routed in the refrigerant circuit which additionally has a throttle 10 and a compressor 11 .
  • the curved thick arrow shows that a part of the process air from the drum 2 downstream of the condenser 8 is routed back into the supply air channel, not shown here, containing the condenser 8 .
  • FIG. 6 shows a diagram which shows by thick arrows the flow of process air through the condenser 8 , the drum 2 , the evaporator 9 and a sub-cooler 17 according to a third embodiment of the condenser tumble dryer 1 according to the invention, wherein the thin arrows show the flow of a refrigerant through the components of the heat pump used.
  • the refrigerant is routed in the refrigerant circuit which additionally has a throttle 10 and a compressor 11 .
  • the curved thick arrow shows that according to the invention a part of the process air from the drum 2 , in comparison with FIG. 5 , is preferably routed back upstream of, or at, the condenser 8 into the supply air channel, not shown here, containing the condenser 8 .
  • FIG. 7 shows a perspective plan view of a lower part of a condenser tumble dryer used according to the invention, in which, in particular, a common wall 14 separating the condenser 8 from the exhaust air channel, not shown here, can be seen, the wall having a plurality of holes 15 in an inlet region 16 of the condenser 8 . 13 indicates an inlet part of the supply air channel, also not shown here.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Drying Of Solid Materials (AREA)
US18/549,962 2021-03-09 2022-02-17 Condenser tumble dryer having a heat pump and a recirculated air portion and method for the operation thereof Pending US20240167215A1 (en)

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PCT/EP2022/053928 WO2022189115A1 (de) 2021-03-09 2022-02-17 Kondensationstrockner mit wärmepumpe und umluftanteil sowie verfahren zu seinem betrieb

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EP4305231A1 (de) 2024-01-17
DE102021202230A1 (de) 2022-09-15

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