EP0063358A2 - Procédé et dispositif pour sécher un objet - Google Patents

Procédé et dispositif pour sécher un objet Download PDF

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Publication number
EP0063358A2
EP0063358A2 EP82103141A EP82103141A EP0063358A2 EP 0063358 A2 EP0063358 A2 EP 0063358A2 EP 82103141 A EP82103141 A EP 82103141A EP 82103141 A EP82103141 A EP 82103141A EP 0063358 A2 EP0063358 A2 EP 0063358A2
Authority
EP
European Patent Office
Prior art keywords
drying
gas
heat exchanger
air
dried
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Withdrawn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
EP82103141A
Other languages
German (de)
English (en)
Other versions
EP0063358A3 (fr
Inventor
Walter Dr. Mehnert
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.)
Bolkow Ludwig Dr
Original Assignee
Bolkow Ludwig Dr
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bolkow Ludwig Dr filed Critical Bolkow Ludwig Dr
Publication of EP0063358A2 publication Critical patent/EP0063358A2/fr
Publication of EP0063358A3 publication Critical patent/EP0063358A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D20/00—Hair drying devices; Accessories therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0038—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for drying or dehumidifying gases or vapours

Definitions

  • the invention relates to a method for drying an object and a device for performing this method according to the preambles of claims 1 and 4 respectively.
  • a particularly typical application for drying devices of this type is hair dryers or hair drying hoods, as are used, for example, in hairdressing shops.
  • a blower With the help of a blower, air is sucked in as dry gas from the surrounding space and passed over a heating device, where it is heated in order to lower the relative humidity or to increase the absorption capacity for water vapor from the air flowing over the wet hair.
  • the invention is therefore based on the object of creating a method and a device of the type mentioned at the outset, in which the drying time is reduced to a minimum even at a lower predetermined maximum temperature for the drying gas.
  • the moisture which is present in most cases from the outset is withdrawn from the gas before the gas is heated, i.e. the absolute air humidity is first reduced before the relative air humidity is then also reduced.
  • the absolute air humidity is first reduced before the relative air humidity is then also reduced.
  • a particular advantage of this method according to the invention can be seen in the fact that when it is used in closed rooms, the absolute humidity in these rooms does not increase.
  • the gas is preferably dehumidified by cooling it at least to the dew point before heating and collecting and removing the condensing moisture.
  • the air emerging from the devices has a higher temperature than the ambient air previously sucked in, i.e. is heated inside the device, it is still advantageous to first cool the sucked air to the extent described above and thereby dehumidify it.
  • energy must first be used to extract heat from the ambient air, which must then be supplied again after this air has been dehumidified, it follows that the outlet temperature of the drying gas in a drying device according to the invention can be substantially lower than in a conventional drying device and that a shorter drying time can be achieved at the same time, overall / a favorable energy balance.
  • the removal of the moisture extracted from the sucked-in ambient air is particularly easy if this air is allowed to flow vertically downward when it cools down, brushing along also vertically arranged heat exchanger walls.
  • the droplet of moisture that separates out is preferably deposited on these vertical walls, on which they run downwards and can drain at the bottom.
  • a collecting trough can be provided, which at the same time serves to redirect the air flow directed downwards back up into the heat exchanger used for heating.
  • the collecting trough is advantageously arranged in such a way that the moisture collected in it is led out of the gas stream in the shortest possible way, preferably in a flow direction rectified to the gas stream, in order to prevent the moisture from diffusing back into the gas stream rising and heating on the heater side .
  • a back diffusion of already excreted moisture into the gas stream can be avoided particularly effectively by operating the cooling device at a temperature below the freezing point, so that the moisture extracted from the gas stream is deposited on it in the form of an ice layer.
  • a sensor is provided in the area of the cooling heat exchanger for this case, which emits a signal to a central control unit when the ice layer reaches a predetermined thickness or has exceeded.
  • the central control then briefly switches off the blower unit which draws in ambient air and controls a valve arrangement provided in the feed lines of the heat exchanger in such a way that thermal energy is supplied to the heat exchanger which acts as a cooler in normal operation.
  • a drying device can be used to dry a wide variety of objects, or the moisture content of the object to be dried can always be different, it is advantageous in order to achieve minimal energy consumption in the area of the object to be dried for temperature and / or temperature sensors Provide moisture content of the air that has been blown over the object to be dried and regulate the suction power of the blower depending on the measured values concerned. This also makes it possible to optimally adapt the suction power when the same object becomes dryer.
  • a completely or almost closed circuit can advantageously be provided, i.e. the air blown over the object to be dried and again loaded with moisture is collected and returned in a closed pipeline to the suction end of the drying device according to the invention.
  • a drying device 10 has a housing 11 (shown only with dashed lines) in which two heat exchangers 12, 13 are arranged one behind the other.
  • Each of the two heat exchangers 12, 13 has an essentially box-shaped structure, each with a front wall 12a, 13a and a rear wall 12b, 13b, which are connected to one another by connecting walls 12c, 13c in order to achieve the largest possible surface area. All of these walls can either be designed in a known manner as hollow bodies which are traversed by flow channels for a coolant or heating medium.
  • each of the two heat exchangers 12, 13 a pipe 14 shown in FIG. 1 only for the heat exchanger 12 in broken lines, through which the relevant coolant or heating medium flows.
  • This pipe 14 is wound in a meandering shape so that it passes through the respective heat exchanger 12 or 13 over its entire height. It runs approximately parallel to its front and rear walls and passes through the connecting walls 12c and 13c approximately vertically.
  • the pipeline 14 is connected to these connecting walls 12c, 13c in such a way that there is good thermal contact and, if possible, the entire surface of the heat exchanger 12 or 13 assumes the temperature which is predetermined by the medium flowing in the pipeline 14.
  • the two heat exchangers 12, 13 are formed by the condenser or evaporator of a heat pump which comprises the compressor 15 which is only shown schematically in FIG. 1.
  • the connecting lines between the compressor 15 and the ends 16 of the pipelines 14 protruding from the heat exchangers 12 and 13 are omitted in FIG. 1 for the sake of simplicity, but in reality, of course, they are present.
  • the rear heat exchanger 13 which forms the evaporator of the heat pump in normal operation, extends with its upper end to just below the cover plate 17 of the housing 11, which has one or more openings in its area opposite the upper end of the heat exchanger 13, through the ambient air into the Device can flow, as indicated by the arrows E in the figures.
  • This inlet opening is advantageously protected against the ingress of dust, dirt, hair or the like by a grille or a filter.
  • the inlet opening or openings is adjoined by a substantially downward flow path 19, which in the present exemplary embodiment consists of a plurality of vertically arranged shafts, each bordered by the front wall 13a, the rear wall 13b and two connecting walls 13c of the heat exchanger 13.
  • the rear plate 22 extends from the rear edge of the heat exchanger 13 so far obliquely forwards and downwards that its front edge bent downwards extends slightly in front of the lower edge of the front wall 13a of the heat exchanger 13 parallel to the latter.
  • the front plate 23 extends on the other hand, from the front lower edge of the heat exchanger 12 so far down and to the rear that its rear edge above the plate 22 runs so parallel to its front edge that between the two plates an outlet opening for that from the heat exchanger 13 over the entire width of the device 10 on the rear 22 sheet 22 dripping water remains, which, as indicated in FIG.
  • the collected water can be pumped out or drained from the interior of the device either continuously or from time to time from this collecting trough.
  • the air space 20 is separated by a plate 27 from the intermediate space 26 used for thermal insulation between the two heat exchangers 12, 13, so that the air flowing downward from the heat exchanger 13 must enter the vertical shafts of the condenser 12 from below.
  • These shafts form a substantially upward flow path 28, which may be somewhat shorter than the downward flow path 19, in order to allow the vertical shafts of the condenser 12 to open at their upper end into a common air space 30 from which the dehumidified one and heated air is drawn off by means of a blower 32 and, as indicated by the arrow A, is passed on to one or more outlet openings, from which it is then blown onto the object or objects to be dried.
  • the air dehumidified in this way then flows through the sheets 22 and 23 deflected upward along the flow path 28 through the condenser of the heat pump, whereby it is heated to a temperature above the ambient temperature so that air can be blown onto the object to be dried.
  • a sensor (not shown) can be arranged in the area of the heat exchanger 13 which operates as an evaporator of the heat pump during normal operation and which, when ice forms on the heat exchanger 13, emits an electrical signal to the electronic control device 35, which is only shown schematically in FIG. 1 .
  • the fan 32 is then temporarily switched off by this control device and a valve arrangement in the flow paths between the compressor 15 and the heat exchangers 12 and 13, likewise not shown in the figures, is controlled in such a way that, for a short defrosting phase, the heat exchanger 12 as evaporator and the heat exchanger 13 works as a condenser of the heat pump.
  • the electronics 35 controls the valves so that the heat exchanger 13 is operated again as an evaporator and the heat exchanger 12 as a condenser . The blower 32 is then also put into operation again.
  • further measuring sensors can be provided for detecting the temperature and / or the moisture content of the air flowing around the object to be dried.
  • the control signals emitted by these further sensors are then used to regulate the suction power of the blower 32.
  • the air emitted by the drying device 10 after it has absorbed moisture from the object to be dried, is collected and fed directly to the evaporator 13.
  • the evaporator 13 has approximately the same vertical height as the condenser 12, so that an air space common to the various shafts is also formed above it, into which the return line coming from the object to be dried opens.
  • the drying device according to the invention can be used in a particularly advantageous manner for drying hair, the line indicated by the arrow A leading to one or more hair dryer nozzles or drying hoods. Particularly when using drying hoods, there is the possibility of collecting the air after it has taken up moisture from the hair and immediately returning it to the device 10.

Landscapes

  • Drying Of Solid Materials (AREA)
EP82103141A 1981-04-14 1982-04-14 Procédé et dispositif pour sécher un objet Withdrawn EP0063358A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813115046 DE3115046A1 (de) 1981-04-14 1981-04-14 Verfahren und vorrichtung zum trocknen eines objekt
DE3115046 1981-04-14

Publications (2)

Publication Number Publication Date
EP0063358A2 true EP0063358A2 (fr) 1982-10-27
EP0063358A3 EP0063358A3 (fr) 1985-01-23

Family

ID=6130123

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82103141A Withdrawn EP0063358A3 (fr) 1981-04-14 1982-04-14 Procédé et dispositif pour sécher un objet

Country Status (2)

Country Link
EP (1) EP0063358A3 (fr)
DE (1) DE3115046A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT405331B (de) * 1997-02-03 1999-07-26 Eisbaer Air Tec Entfeuchtungst Verfahren zum trocknen von gegenständen und stoffen mittels luft
DE10311602A1 (de) * 2003-03-14 2004-09-23 Agt Thermotechnik Gmbh Vorrichtung, insbesondere Wärmetauscher, und Verfahren
AT412844B (de) * 2004-01-07 2005-08-25 Agre Kompressoren Gmbh Drucklufttrockner
DE102016010629A1 (de) 2016-09-05 2018-03-08 Stiebel Eltron Gmbh & Co. Kg Luft- Wasserwärmepumpe mit einem Gehäuse für eine Außenaufstellung
DE102016010630A1 (de) 2016-09-05 2018-03-08 Stiebel Eltron Gmbh & Co. Kg Luft- Wasserwärmepumpe mit einem Gehäuse für eine Außenaufstellung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2392405A (en) * 1941-12-16 1946-01-08 Phipps Charles Albert Hair drying process
US2527745A (en) * 1947-06-06 1950-10-31 Lawrence William Arthur Hair drying apparatus
FR976280A (fr) * 1948-10-08 1951-03-15 Mougin Freres Perfectionnements aux appareils de séchage pour cheveux
CH436612A (de) * 1964-05-01 1967-05-31 Ledermann Hugo Warmlufttrockner für Hände und andere Körperteile sowie Kopfhaare
US3364590A (en) * 1966-08-09 1968-01-23 George W. Collins Dryer unit
US3885322A (en) * 1974-04-22 1975-05-27 Mallofre Salvador Gali Hairdryers

Also Published As

Publication number Publication date
DE3115046A1 (de) 1982-11-04
EP0063358A3 (fr) 1985-01-23

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19830413

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Effective date: 19851031

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Inventor name: MEHNERT, WALTER, DR.