EP1990588A2 - Machine ménagère dotée d'un dispositif de refroidissement - Google Patents

Machine ménagère dotée d'un dispositif de refroidissement Download PDF

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Publication number
EP1990588A2
EP1990588A2 EP08008696A EP08008696A EP1990588A2 EP 1990588 A2 EP1990588 A2 EP 1990588A2 EP 08008696 A EP08008696 A EP 08008696A EP 08008696 A EP08008696 A EP 08008696A EP 1990588 A2 EP1990588 A2 EP 1990588A2
Authority
EP
European Patent Office
Prior art keywords
sorbent
refrigerant
heat
domestic appliance
liquid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08008696A
Other languages
German (de)
English (en)
Inventor
Bernd Geser
Georg Pfitzer
Heiz-Dieter Dr. Eichholz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mecoswiss Mechanische Componenten Gmbh and Co KG
Original Assignee
Mecoswiss Mechanische Componenten Gmbh and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE102007049054A external-priority patent/DE102007049054A1/de
Application filed by Mecoswiss Mechanische Componenten Gmbh and Co KG filed Critical Mecoswiss Mechanische Componenten Gmbh and Co KG
Publication of EP1990588A2 publication Critical patent/EP1990588A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/24—Condensing arrangements
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/48—Drying arrangements
    • A47L15/481—Drying arrangements by using water absorbent materials, e.g. Zeolith
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
    • F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas

Definitions

  • the invention relates to a household appliance with a cooling device according to the preamble of claim 1.
  • a cooling device in many household appliances such as dishwashers, dryers or the like, in addition to other operations frequently a cooling process at least as a partial program step of advantage.
  • the cooling of a hot beverage may be useful to provide a hot processed beverage as a cold drink, for example as iced coffee.
  • Cooling units are also advantageous for drying operations, since they allow moisture to be condensed from the air.
  • a tumble dryer for example, the entire operation is a drying process, in a machine such as a dishwasher or a washing machine with integrated drying, however, usually provided as a part program step at the end of a program flow.
  • the items to be washed can be dried by the intrinsic heat if the items to be washed in the last rinse, which is usually a rinse cycle, are rinsed so hot that the item to be washed then dries quickly by itself.
  • a dishwashing machine has been proposed in which the drying is effected by the moist air from the working space of the dishwasher condensing on a cold condensation surface, so that the condensate water can be removed.
  • the cooling of the condensation surface is carried out here by a self-contained device taking advantage of the evaporation of water.
  • water is evaporated as a refrigerant, whereby the surface of the evaporator cools, so that it can condense water from a passing air stream.
  • the evaporation of the water is achieved by the connection of the evaporator with a sorption container connected thereto, which contains a sorber, which adsorbs the evaporated refrigerant.
  • a sorption container connected thereto, which contains a sorber, which adsorbs the evaporated refrigerant.
  • the cited prior art document proposes the use of zeolite as a sorber.
  • the object of the invention is therefore to provide a household appliance with a cooling unit, for. B. for the drying of wet, cleaned objects via condensation, which offers extended opportunities for heat utilization of the heat applied to the cooling unit heat as process heat in the working mode of the appliance.
  • a household appliance according to the invention is characterized in that a liquid sorbent and / or a liquid sorbent / refrigerant mixture is provided.
  • the heat input into the sorbent or the sorbent / refrigerant mixture can be made in a spatially restricted area within the sorption, wherein by circulation, that is by an active circulation with pumping or stirring means or even by passive circulation by convection due to the temperature differences in the sorbent or the sorbent / refrigerant mixture a uniform heat distribution can be achieved.
  • the heat supply is possible, for example, in that a heat transfer from at least part of the cleaning liquid heated in the machine process, e.g. a rinsing liquor in a dishwasher, a heat transfer to the sorbent by means of an Ileizschlange or a heat exchanger is provided.
  • a heat transfer from at least part of the cleaning liquid heated in the machine process e.g. a rinsing liquor in a dishwasher
  • a heat transfer to the sorbent by means of an Ileizschlange or a heat exchanger is provided.
  • the use of an electric heating coil in the form of an immersion heater is just as easily possible as a heater on the container wall of the sorption.
  • the sorbent or the sorbent / refrigerant mixture can be circulated via a heat exchanger and / or in turn by heating coils or water heaters for the rinsing liquor or for fresh water to be heated.
  • the refrigerant used here is preferably a solvent which is soluble in the liquid sorbent and which is completely or partially separable from the sorbent by heat input. This eliminates the need for a compressor or other pumps in many refrigeration systems.
  • a distillation column is preferably provided.
  • About such a separation column can be gradually concentrated by a gaseous heat expelled from the sorbent / refrigerant mixture gas mixture, so that on The output of such a column is a highly enriched with refrigerant gas mixture or, ideally, the refrigerant is in pure form.
  • a condensation device for the expelled coolant is advantageously provided following the distillation column in order to condense this from the gas phase, the liquid phase.
  • a cooling device is preferably provided, which is cooled in a particularly advantageous embodiment by anyway required in the operation of the household appliance fresh water. The fresh water is preheated by this process, so that the introduced for the distillation process in the gas phase heat energy is directly available as process heat again.
  • a collecting container is provided for the expelled coolant in liquid form.
  • a cold storage can be realized, which can be activated at a later time.
  • a shut-off valve is preferably provided in the connecting line between the refrigerant tank and the sorption container containing the sorbent or the sorbent / refrigerant mixture. As long as this check valve is closed, the separated and condensed coolant remains as a cold reservoir.
  • the sorbent or the sorbent / refrigerant mixture is cooled in the sorption container in an advantageous embodiment.
  • the waste heat of the sorbent or of the sorbent / refrigerant mixture can in turn be used as process heat, for example for a rinsing liquor or for the heating of fresh water.
  • a liquid Sorbent or sorbent / refrigerant mixture it is possible to circulate this via a heat exchanger and thus to heat, for example, the bottom of a dishwasher or fresh water via a heating coil or a water heater or other heat exchanger.
  • a fresh water tank is provided for this purpose, which can accommodate a ausrcichende amount of fresh water to absorb the waste heat from the cooling unit as far as possible largely for further use.
  • the waste heat of the optionally provided distillation column can also be used at least partially as process heat.
  • a heat exchanger is again preferably provided in order to heat the corresponding process fluid receiving the waste heat as process heat.
  • the refrigeration operation may be initiated by opening the communication valve between the refrigerant tank and the sorbent tank.
  • the refrigerant evaporates, cooling the environment.
  • the vaporized refrigerant then goes into solution in the sorbent, which heats up by the heat of sorption.
  • This heat of the refrigerant to be enriched with sorbent can be used in turn as process heat.
  • a direct air cooling is possible, for example for drying objects to be dried, for example, to reheat a cold air stream cooled at the evaporator using the sorption heat. It is particularly advantageous when using a liquid sorbent or sorbent / refrigerant mixture.
  • its circulation via a cooler or heat exchanger with a large surface so that a good heat transfer to the air flowing through is possible.
  • Such coolers for example in lamellar form, are available in large numbers for various technical applications in commerce.
  • the cold vaporized or vapourizing refrigerant may be passed through a heat exchanger or cooler to which the moist air from the space containing the objects to be dried, e.g. a Spülbc marryer is passed.
  • the moisture from this humid air condenses during this cooling process and can be dissipated.
  • the dry cold air may be used to improve drying e.g. be heated again as described above.
  • this condensate can also be used for fresh water conditioning. In this way, if appropriate, the regeneration processes of an ion exchanger can take place at relatively long intervals and / or the ion exchanger of the household appliance can be made smaller. It is always a reduction in salt consumption the result.
  • the conditioning of the fresh water is in particular in combination with a fresh water storage tank as stated above, easily possible.
  • the refrigerant is again dissolved in the sorbent and is thus available for a new duty cycle.
  • the circulation pump of the rinsing liquor of a dishwasher can be used, in which it is guided through a cooling coil located in the sorption container.
  • a second fresh water tank can be provided so that a fresh water flow can be reached by gravity.
  • the fresh water inlet can also be guided directly via corresponding heat exchanger elements, so that the fresh water reaching the fresh water storage tank has already run over all the required heating stages.
  • the heating of the refrigerant-enriched sorbent for the purpose of desorption can be carried out, for example, by means of an existing anyway in the household appliance heater for a working fluid, eg for a rinsing liquor.
  • the working fluid can be preheated in whole or in part by the heater of the household machine and transfer the heat via a heating coil or a heat exchanger to the liquid sorbent / refrigerant mixture. This heating process using the already existing heater is quite possibly with already preheated fresh water possible.
  • refrigerant for example, ammonia comes into question, which is already used in combination with water as a sorbent in so-called Absorbtions Koltemaschinen.
  • the likewise known system of water as a refrigerant in a lithium bromide solution can also be used according to the invention.
  • These and other refrigerants and sorption materials are readily usable in combinations of several mixtures with one another within the scope of the invention.
  • the cooling unit according to the invention can be used advantageously where the cooling requirement can occur separately from the heat input into the sorption agent, since a cold reservoir in the form of a specific volume of condensed refrigerant is stored cyclically.
  • a cold reservoir in the form of a specific volume of condensed refrigerant is stored cyclically.
  • beverage machines in which hot drinks are subsequently cooled, e.g. in coffee or espresso machines for the preparation of "cold coffee".
  • the invention can be used advantageously in household appliances, wherein from a cold storage or the cooling unit in particular spontaneously or immediately and / or short-term cooling cold for cooling operating media and / or items needed or in demand or is retrievable.
  • this can also be of particular advantage for example for the rapid cooling of wine bottles, medical cooling packs etc. in refrigerators or the like.
  • the cooling device 1 comprises a sorption container 2, in which a mixture 3 of sorbent and refrigerant is filled in liquid form.
  • a heating of the sorbent / refrigerant mixture 3 via an electric heating coil 4 is possible, which protrudes in the manner of an immersion heater in the liquid standing in the sorption 2.
  • the heating coil 4 can only locally warm the sorbent / refrigerant mixture, since due to the liquid property nevertheless results in a uniform heat distribution by convection.
  • the heat distribution by stirring or Pump elements are supported.
  • a fluid pipe coil 5 which is designed in principle as the electric heating coil 4, but consists of a hollow tube, so that a hot fluid, such as a working fluid from the operation of the household machine can be supplied heated, so on this way, the sorbent / refrigerant mixture 3 is heated.
  • a third alternative heating is via an external heat exchanger 6, through which the liquid sorbent / refrigerant mixture is circulated.
  • a working fluid 7 can be used to supply heat via the heat exchanger 6.
  • Such a working fluid 7 is indicated by means of an arrow. It can also be a specially provided heating medium in interaction with the heat exchanger 6 for heating the sorbent / refrigerant mixture are used.
  • the refrigerant or a higher concentration mixture of sorbent and refrigerant is evaporated depending on the substance selection and passes through a check valve 8 in a cooler 9.
  • a distillation column 10 can be interposed to one step from the sorption 2 been exaggerated Concentrate sorbent / refrigerant mixture.
  • cooler 9 thus enters either refrigerant in pure form or a sorbent / refrigerant mixture in high concentration of refrigerant.
  • a condensation is initiated due to the cooling, so that the concentrated mixture or the pure refrigerant can be collected in liquid form in a refrigerant tank 11.
  • a cooling fluid 12 can be used, for example, that is suitable for further utilizing the waste heat.
  • fresh water can be used to use the withdrawn during the cooling process Desorptionsblaze for preheating the cooling water.
  • the refrigerant container 11 can be separated from the sorbent container 2 via a further shut-off valve 13, so that when the shut-off valve 13 is closed, the refrigerant present in liquid form in the refrigerant container 11 can be kept stored as a cold storage.
  • the sorption agent or the refrigerant-depleted mixture of sorbent and refrigerant 3 in the sorption container 2 can be cooled in this step, which in turn can be accomplished for example by using the heat exchanger 6 in conjunction with a cooling fluid. Due to the liquid form of the sorbent. or the sorbent / refrigerant mixture, this can also be circulated for cooling via a heat exchanger 6 and a cooler. However, a cooling fluid can also be circulated for cooling via a cooling coil projecting into the sorption container 2 or be used via the container wall of the sorption container 2. As a cooling coil in this case, for example, the previously used as a heating coil fluid tube coil 5 can be used.
  • a further heat exchanger 14 is also shown, which forms the cooling unit when the shut-off valve 13 is open and, for example, can be configured as a cooler for a hot air stream 15.
  • the hot air 15 may be taken from the interior of a household appliance in a suitable manner, e.g. withdrawn by means of a blower and passed over the heat exchanger 14 serving as a cooler.
  • the accumulating condensate can be removed or, as indicated above, used for fresh water conditioning or simply to supplement the hot water demand.
  • the dry cold air stream 16 can optionally be heated again using the heat of sorption in the solution of the refrigerant in the sorbent 3.
  • the cold air stream 16 can be conducted via the fluid pipe coil 5 and / or the heat exchanger 6, so that it is reheated using the sorption heat.
  • This heated dry air stream is ideal for drying wet cleaned items, such as items to be washed in a dishwasher.
  • FIG. 2 corresponds essentially to the aforementioned embodiment, but is structurally significantly simplified.
  • this design is characterized by the fact that it is very flat feasible, so that it can be grown on a side wall of the working space of a household appliance.
  • the cooling device 21 includes, as the aforementioned embodiment, a sorption container 22, in which, depending on the operating state, a sorbent / refrigerant mixture is in an enriched or depleted state.
  • the sorbent / refrigerant mixture in sorption container 22 can be heated by heating means, not shown. As a result, the refrigerant can evaporate and escape into the rectification region 23 of a pipeline 24.
  • the rectification section 23 in the present embodiment is provided with baffles 25 to which coevaporated sorbent may condense and reflux, so that the separation of sorbent and refrigerant in the rectification section 23 is improved.
  • the rectification region 23 accordingly corresponds in its function to the distillation column 10 of the above-described embodiment.
  • a check valve 26 separates the rectification area 23 from the subsequent condensation unit 27, which is designed as a partial area of the pipeline 24.
  • the condensation unit is constructed serpentine and provided in its end with a cross-sectional taper 28.
  • a switching valve 29 limits the condensation unit 27 and interrupts its connection to the sorption container 22 in the flow direction of the refrigerant. Between the check valve 26 and the switching valve 29, the pipe 24 accordingly forms the refrigerant container contained in the aforementioned embodiment.
  • the condensation of the refrigerant takes place in the illustrated Embodiment by the heat transfer to the environment without active cooling. If necessary, however, it is readily possible to provide active cooling in this area, for example with fresh water.
  • the switching valve 29 is followed by a cooling unit 30 in the form of a portion of the pipe 24, which is arranged substantially below the condensation region and also formed serpentine.
  • the pipe 24 ends with an end piece 31 behind the evaporator section 30 in the sorption tank 22.
  • the cooling unit is cooled by evaporating or cold, already vaporized refrigerant and can deliver the cold thus produced.
  • This embodiment is structurally already considerably simplified compared to the first embodiment.
  • the entire recycling of the refrigerant takes place in a single pipeline.
  • this cooling device 21 only two temporally cntkoppelbare control operations must be made.
  • the refrigerant / sorption mixture in the sorption 22 must be heated.
  • condensed refrigerant in the condensation unit 27 is available as a cold storage.
  • the switching valve 29 can be opened at the desired time, so that the refrigerant can escape in the direction of the sorption container 22 and can be used in the cooling unit 30 with evaporation for cooling.
  • This embodiment is therefore greatly simplified not only in terms of the structural design, but also in terms of the control effort over the first embodiment.
  • the embodiment according to FIG. 3 again has one Rectification region 32 of a pipe 33, which branches off from a sorption 34.
  • the rectification region 32 in turn passes via a check valve 36 into a condensation unit 35 designed as a pipeline, which in turn is of serpentine configuration.
  • the condensation unit 35 ends as a dead end at its upper end 37.
  • the condensation unit 35 is therefore filled from below, that is, already condensed refrigerant supports the condensation process during the passage of gaseous, not shown by heating means of the Sorption tank 34 expelled refrigerant.
  • a cooling line 38 which opens via a switching valve 39 in a riser 40.
  • the riser 40 already belongs to a cooling unit 41, which is tubular and in which the refrigerant evaporates.
  • the cooling unit 41 is fitted to the serpentine condensation unit 35. It ends in a discharge line 42 in the sorption container 34.
  • This embodiment variant can in turn be constructed very flat and at the same time comparatively low.
  • the branching cooling line 38 is provided with a reduced cross-section.
  • the evaporation process is assisted by the fact that liquid refrigerant is forced under gravity into the riser 40 of the cooling unit 41. Due to the resulting cooling effect of the condensation unit 35 due to the thermal contact between the cooling unit 41 and condensation unit 35 is at the same time the remaining condensation of any gaseous residues of Refrigerant in the upper region of the condensation unit 35 causes. There is thus an almost complete Entlegrung the condensation unit 35 instead, whereby the existing refrigerant is used highly efficiently.
  • the embodiment according to FIG. 3 is accordingly more compact than the embodiment according to FIG. 2 feasible with comparable cooling capacity. In both cases, it is a substantially closed pipe system, so that the requirements for tightness can be easily met.
  • the embodiment according to FIG. 3 takes advantage of the fact that in a cooling device according to the invention, the timing of the expulsion of the refrigerant from the sorption 34 is decoupled by heating from the time of the desired cooling. Accordingly, the variant according to FIG. 3 no closed circuit, consisting of rectification area, condensation unit and cooling unit. Rather, the temporal decoupling between heat input and cooling is used to the effect that a reversal of the flow direction in the condensation unit 35 is possible. The filling of the condensation unit 35 when expelling the refrigerant from the sorbent is thus in the reverse direction as the emptying into the cooling unit.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Sorption Type Refrigeration Machines (AREA)
EP08008696A 2007-05-11 2008-05-09 Machine ménagère dotée d'un dispositif de refroidissement Withdrawn EP1990588A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007022697 2007-05-11
DE102007049054A DE102007049054A1 (de) 2007-05-11 2007-10-11 Haushaltsmaschine mit Kühlvorrichtung

Publications (1)

Publication Number Publication Date
EP1990588A2 true EP1990588A2 (fr) 2008-11-12

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EP08008696A Withdrawn EP1990588A2 (fr) 2007-05-11 2008-05-09 Machine ménagère dotée d'un dispositif de refroidissement

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EP (1) EP1990588A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2292132A2 (fr) * 2009-09-02 2011-03-09 BSH Bosch und Siemens Hausgeräte GmbH Lave-vaisselle et procédé de commande correspondant
CN107166982A (zh) * 2017-06-29 2017-09-15 攀钢集团西昌钢钒有限公司 一种乳化液蒸汽加热系统

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005053503A1 (fr) 2003-12-04 2005-06-16 BSH Bosch und Siemens Hausgeräte GmbH Lave-vaisselle

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005053503A1 (fr) 2003-12-04 2005-06-16 BSH Bosch und Siemens Hausgeräte GmbH Lave-vaisselle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2292132A2 (fr) * 2009-09-02 2011-03-09 BSH Bosch und Siemens Hausgeräte GmbH Lave-vaisselle et procédé de commande correspondant
CN107166982A (zh) * 2017-06-29 2017-09-15 攀钢集团西昌钢钒有限公司 一种乳化液蒸汽加热系统

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