SE0900767A1 - Device for dew precipitation from moist air - Google Patents
Device for dew precipitation from moist airInfo
- Publication number
- SE0900767A1 SE0900767A1 SE0900767A SE0900767A SE0900767A1 SE 0900767 A1 SE0900767 A1 SE 0900767A1 SE 0900767 A SE0900767 A SE 0900767A SE 0900767 A SE0900767 A SE 0900767A SE 0900767 A1 SE0900767 A1 SE 0900767A1
- Authority
- SE
- Sweden
- Prior art keywords
- membranes
- flow
- cooling water
- cooling
- cooler
- Prior art date
Links
- 238000001556 precipitation Methods 0.000 title claims 2
- 239000012528 membrane Substances 0.000 claims description 27
- 238000001035 drying Methods 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 14
- 239000000498 cooling water Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 101100069818 Caenorhabditis elegans gur-3 gene Proteins 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002551 biofuel Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/265—Drying gases or vapours by refrigeration (condensation)
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
- F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B3/00—Condensers in which the steam or vapour comes into direct contact with the cooling medium
- F28B3/02—Condensers in which the steam or vapour comes into direct contact with the cooling medium by providing a flowing coating of cooling liquid on the condensing surface
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
- F24F2003/1435—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification comprising semi-permeable membrane
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
- F24F2003/144—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by dehumidification only
- F24F2003/1446—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by dehumidification only by condensing
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Sustainable Development (AREA)
- Drying Of Solid Materials (AREA)
Description
2 ångkondensation uppvärmt kylvattenflöde i en undre ränna och återcirkulation av kylvattenflödet via en kylare. 2 steam condensation heated cooling water fl deserted in a lower gutter and recirculation of cooling water fl fate via a cooler.
Uppfinningen beskrives nedan i anslutning till figurerna, varvid figur 1 visar anordningen i vertikal tvärsektion, figur 2 visar i sektion installation i en kammartork för virke och figur 3 i plan inkoppling mot annan torkprocess.The invention is described below in connection with the figures, wherein figure 1 shows the device in vertical cross section, figure 2 shows in section installation in a chamber dryer for wood and fi gur 3 in flat connection to another torkprocess.
Inom ett utrymme genomströmmat av varm, fiiktig luft 2 är på konsolorgan 13 fästade bärmembran 11, ex,vis av 75 my polyesterfilm med bredd 0.85 m och valfri höj dutsträckning. Membranen fästes mot konsolema lämpligen med dubbelhäftande, vattenstabil tejp och konsolema monteras på en väggfast skena 14 med cc-avstånd i storleksordning 15 cm. Bärmembranen 11 sträckes vertikalt företrädesvis genom att anordnas som bandformade slingor belastade av vikter 15 i slingbottnarna. De vertikala ytorna av bärmembranen 11 är avtäckta av täckmembran 12 av samma bredd löst hängande och fixerad till bärmembranet med korta bitar av 1.5 mm akrylfoamtejp utmed membranens överkanter. Mellan dessa bitar är instuckna de snedskuma ändama av klena, lika långa plastslangar 6 av dimension 3/5 mm. Lämpligt antal slangar är 6 st jämt fördelade över en membranbredd på 0.85 m. Slangama lindas mer eller mindre upp över ett över vardera konsolpar monterat öppet rörformat kärl 61 och snedskurna ändar pressas in vägghål i kärlet, lämpligen utformat i plast och tjockväggigt.Within a space through which hot, fi-like air 2 is on the console means 13 attached support membranes 11, for example, 75 microns polyester film with a width of 0.85 m and optional raise dut stretch. The membranes are suitably attached to the brackets with double-sided adhesive, water-stable tape and the brackets are mounted on one wall-mounted rail 14 with cc distance in the order of 15 cm. Bärmembranen 11 is stretched vertically, preferably by being arranged as strip-shaped loops loaded by weights 15 in the loop bottoms. The vertical surfaces of the support membranes 11 are covered by cover membranes 12 of the same width loosely hanging and fixed to the support membrane with short pieces of 1.5 mm acrylic foam tape along the upper edges of the membrane. Between these pieces is inserted the oblique foam ends of thin, equally long plastic hoses 6 of dimension 3/5 mm. The appropriate number of hoses is 6 evenly distributed over one membrane width of 0.85 m. The hoses are wound more or less up over one over each bracket pair mounted open tubular vessel 61 and obliquely cut ends are pressed into wall holes in the vessel, suitably formed of plastic and thick-walled.
Membranen 11,12 utbildar kylytor l sålunda. Ett kylvattenflöde 5 fördelas lika mellan samtliga kärl 61. I varj e kärl stiger vatten till en nivå 611, varvid tillflöde är lika med utloppen via 12 st anslutna slangar 6. Eftersom tryckfall och statisk drivkraft är lika för alla slangar fördelar sig flödet lika mellan slangarna oberoende av massflödet. Flödet sålunda jämt injicerat mellan membranparen 11,12 utbreder sig som kapillärt utbredda, uppvärmda fallfilmer 51 mellan membranparen, uppsamlas i en undre ränna 52 och återcirkuleras via en kylare 8.The membranes 11,12 thus form cooling surfaces. A cooling water fl fate 5 is distributed equal between all vessels 61. In each vessel water rises to a level 611, whereby to fl fate is equal to the outlets via 12 connected hoses 6. Because pressure drop and static drive are equal for all hoses ar fate is distributed equally between the hoses regardless of mass fate. The flow is thus evenly injected between the membrane pairs 11,12 propagate as capillary propagated, heated cases 51 between the membrane pairs, are collected in a lower gutter 52 and recirculated via a cooler 8.
Allt material i kylvattencirkulationen, eventuellt frånsett kylaren 8, utgörs av plaster med hög tolerans mot en i torkluft korrosiv miljö. På kylytan 1 utfällt kondensat kan inblandas i kylvattenflödet 5 eller med lätt utförda arrangemang avledas till en separat bottenränna.All material in the cooling water circulation, possibly excluding cooler 8, is constituted of plastics with high tolerance to a corrosive environment in drying air. On the cooling surface 1 precipitated condensate can be mixed in cooling water fl fate 5 or with lightly made arrangements are diverted to a separate bottom channel.
Kylytorna 1 täcks av diffusionsöppna, vänneisolerande skikt 3, vilket medför att membranen 11,12 ej störs av luftrörelser, av att blöt kylyta ej kontamineras av damm i strömningen 2 och av att denna i mycket ringa grad kyls av sensibelt. Värmeöverföring mellan strömning 2 och kylyta 1 sker till ca 95% via latent värme i ånga diffunderande genom täckskikten 3 och kondenserande på kylytan. Täckskikten 3 utföres som träramar 4 inom vilka sträckts ett antal skikt av tunn fiberväv 31 med mellanrum av stillastående luft. Dubbla ramar 4 sammanfogas med distansorgan 41 till uppstyvade täckelement 7, varvid mellanrummet mellan ramarna utgör utrymme för strömningen 2. Täckelementen upphakas på skenan 14 mellan membranparen 11,12 och vindstabiliseras inbördes med enkla skruv/täckförband. Utförda till blygsam kostnad är hållbarhet begränsad till ca 2 år, varefter ett utbyte sker på ett rationellt sätt.The cooling surfaces 1 are covered by diffusion-open, friend-insulating layers 3, which means that the membranes 11,12 are not disturbed by air movements, by not wet cooling surface contaminated by dust in the flow 2 and by this in very little degree is cooled off sensitively. Heat transfer between flow 2 and cooling surface 1 occurs to about 95% via latent heat in steam diffusing through the cover layers 3 and condensing on the cooling surface. The cover layers 3 are made as wooden frames 4 inside which have been stretched a number of layers of thin fabric 31 at intervals of stagnant air. Double frames 4 are joined with spacers 41 to stiffened cover elements 7, the space between the frames being space for the flow 2. The cover elements are hooked onto the rail 14 between membrane pairs 11,12 and wind stabilized with each other with simple screw / cover connection. Made at a modest cost, durability is limited to about 2 years, after which an exchange takes place in a rational way.
I referens till figur 2 illustreras anordningen installerad i en typisk befintlig kammartork 9 för virke avfuktad via luftbyte. På en mot bakväggen fäst skena 14 är upphängda erforderligt antal membranslingor 11/12 och täckelement 7. Med en höj dutsträckning på anordningen på ca 2.5 m genomströmmas anordningen av drygt 1/3 av det för torken totala cirkulationsflödet 2. Anordningen stör ej luftfördelningen inom virkespaketen. Luftbytesfläktar 91 blockeras. Vännebehovet sjunker från luftbytesprocessens 1.2 kWh per utdrivet kg vatten till 0.85 kwh inkluderande transmissionsförluster. Ångdiffusionen genom täckskikten 3 är proportionell mot skillnaden av ångtgfck p” i strönnïingen 2 och ångtryfcl: p' över ky-'ly-*tan 1. lv/lätningar på anordningen i en kammartork anger ett ångflöde = 10 g per timme, kvm membran/täckskiktyta och mbar ångtrycksskillnad. Värdet gäller vid ett kylvattenflöde dimensionerat så att temperaturstegringen i detsamma är i storleksordning 20°, ex.vis i temperaturspann +15°/ +35°. Ångtrycksskillnaden p”-p'stiger brant med ökande torkningstemperaturer, vilket illustreras nedan.In reference to Figure 2, the device installed in a typical embodiment is illustrated chamber dryer 9 for wood dehumidified via air exchange. Attached to one against the back wall rail 14 is suspended required number of membrane loops 11/12 and cover element 7. With a high dut distance on the device of approx. 2.5 m the device is traversed by just over 1/3 of the total for the dryer circulation fl fate 2. The device does not interfere with the air distribution within the work package. Air exchange 91 genuine 91 is blocked. The need for friends decreases from the air exchange process 1.2 kWh per expelled kg of water to 0.85 kwh including transmission losses. The vapor diffusion through the cover layers 3 is proportional to the difference of ångtgfck p ”i strönnïingen 2 och ångtryfcl: p 'över ky-'ly- * tan 1. lv / lätningar på the device in a chamber dryer indicates a steam fl fate = 10 g per hour, sqm membrane / cover layer surface and mbar vapor pressure difference. The value applies to one cooling water flow dimensioned so that the temperature rise in it is in order of magnitude 20 °, eg in temperature range + 15 ° / + 35 °. The vapor pressure difference p "-p 'increases steeply with increasing drying temperatures, which is illustrated below.
Eal_l_1. Torrtemperatur = +65°. RH i medeltal under torkningen = 80% med p” = 200 mbar och p'= 23 mbar med differans = 177 mbar och ångflöde = 1.77 kg per kvm membran/täckskiktsyta. Önskad torkhastighet är 250 kg/h, vilket kräver 250/1.77 = 140 kvm eller 18 st membranslingor a 7,5 kvm.Eal_l_1. Dry temperature = + 65 °. RH on average during drying = 80% with p ”= 200 mbar and p '= 23 mbar with difference = 177 mbar and steam fl fate = 1.77 kg per sqm membrane / cover layer surface. Desired drying speed is 250 kg / h, which requires 250 / 1.77 = 140 sqm or 18 membrane loops of 7.5 sqm.
Fall 2. Torrtemperatur = +70°. RH i medeltal under torkningen =80% med p” = 265 mbar och p'= 23 mbar med differans = 242 mbar och ångflöde = 2.42 kg per kvm membran/täckskiktsyta. Önskad torkhastighet är 300 kg/h, vilket kräver 300/ 2.42 = 125 kvm eller 16 st membranslingor a 7,5 kvm.Case 2. Dry temperature = + 70 °. RH on average during drying = 80% with p ”= 265 mbar and p '= 23 mbar with difference = 242 mbar and steam fl fate = 2.42 kg per sqm membrane / cover layer surface. Desired drying speed is 300 kg / h, which requires 300 / 2.42 = 125 sqm or 16 membrane loops of 7.5 sqm.
Membranslingorna ryms väl utmed torkkammarens bredd, ca 6,6 m, med ett cc-avstånd om ca 0.3 m. En installation av anordningen medför en värmebesparing om ca 0.35 kwh/kg avdunstat vatten eller årligen i storleksordning 600 000 kwh. Materialkostnaden för enkelt producerade membran/täckskiktsytor ligger i storleksordning 10 000 kr.The membrane loops fit well along the width of the drying chamber, approx. 6.6 m, with one cc distance of approx. 0.3 m. An installation of the device entails a heat saving of approx. 0.35 kwh / kg evaporated water or annually in order of magnitude 600,000 kwh. The material cost for easily produced membrane / cover layer surfaces are in the order of SEK 10,000.
För kylaren 8 föreligger olika alternativ. Om kondensationsvännet i storleksordning 1,2 millioner kwh årligen från kylytor 1 inte avses att tillvaratagas, kan kylaren utgöra ett vattenmagasin som sjö eller vattendrag eller utgöras av ett kyltom.For cooler 8, there are different options. If the condensation friend in order of magnitude 1.2 million kwh annually from cooling surfaces 1 is not intended to recovered, the cooler can be a reservoir such as a lake or watercourse or consists of a cooling blank.
Med utnyttjande av det gratis erhållna kondensationsvärmet kan kylaren kan vara en effektiv motströms värmeväxlare vatten/luft, varvid kylvattenflödet kylt ca 20° motsvarande värmer ett uteluftflöde effektivt nyttj at för torkning av genomblåsbart biobränsle såsom ex.vis flis.Using the condensation heat obtained for free, the radiator can can be an efficient countercurrent heat / air heat exchanger, wherein cooling water fl fate cooled approx. 20 ° correspondingly heats an outdoor air fl fate effectively used for drying permeable biofuels such as ice.
Kylaren kan vara evaporatom (i form av en plattvärmeväxlare) till en värmepump för drift av torken. Systemet innebär en radikal förbättring av sk. kondenstorkar, som. lider dels av korrosionsproblemt på sina. i kammaren installerade luftvärmda evaporatorer och dels av att dessa kylytor sensibelt kyler ner torkluften. Med en kylfaktor på ca 2.5 på värmepumpen förbättras verkningsgraden till 0.3 kwh/kg vatten från dagens ca 0.7 kwh/ kg.The radiator can be the evaporator (in the form of a plate heat exchanger) to a heat pump for operation of the dryer. The system means a radical improvement of sk. condenser dryers, which. suffers partly from the corrosion problem on their. in the chamber installed air-heated evaporators and partly by these cooling surfaces sensitively cool down the drying air. With a cooling factor of about 2.5 on the heat pump improves the efficiency to 0.3 kwh / kg water from of the day about 0.7 kwh / kg.
I referens till figur 3 illustreras anordningen vid andra torkprocesser, där man inte som i fallet ovan direkt kan installera den i torkluftströmningen.In reference to Figure 3, the device is illustrated in other drying processes, where as in the case above, it can not be installed directly in the drying air flow.
Det kan gälla torkning av ex.vis papper, pappersmassa eller liknande.This can apply to drying of eg paper, pulp or the like.
Anordningen monteras i en sidokanal 92 till torken 9a och ett delflöde 2' av torkluftcirkulationen 2 bläses korsströms genom ett eller flera paket av kylytor 11,12 och täckelement 7. Kylare 8 kan vara av ovan nämnda slag.The device is mounted in a side channel 92 to the dryer 9a and a part fl of 2 ' the drying air circulation 2 is blown cross-current through one or fl of your packages cooling surfaces 11,12 and cover elements 7. Coolers 8 can be of the above-mentioned type.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0900767A SE533409C2 (en) | 2009-06-01 | 2009-06-01 | Device for dew precipitation from moist air |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0900767A SE533409C2 (en) | 2009-06-01 | 2009-06-01 | Device for dew precipitation from moist air |
Publications (2)
Publication Number | Publication Date |
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SE0900767A1 true SE0900767A1 (en) | 2010-09-14 |
SE533409C2 SE533409C2 (en) | 2010-09-14 |
Family
ID=43243842
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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SE0900767A SE533409C2 (en) | 2009-06-01 | 2009-06-01 | Device for dew precipitation from moist air |
Country Status (1)
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SE (1) | SE533409C2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE1900125A1 (en) * | 2019-07-17 | 2021-01-18 | Sten Zeilon | Drying chamber via diffusion dehumidified against boxes inserted in the drying air flow |
-
2009
- 2009-06-01 SE SE0900767A patent/SE533409C2/en not_active IP Right Cessation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE1900125A1 (en) * | 2019-07-17 | 2021-01-18 | Sten Zeilon | Drying chamber via diffusion dehumidified against boxes inserted in the drying air flow |
WO2021010876A1 (en) * | 2019-07-17 | 2021-01-21 | Zeilon Sten | Drying chamber dehumidified by diffusion |
SE543529C2 (en) * | 2019-07-17 | 2021-03-16 | Sten Zeilon | Drying chamber via diffusion dehumidified against boxes inserted in the drying air flow |
Also Published As
Publication number | Publication date |
---|---|
SE533409C2 (en) | 2010-09-14 |
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