Solar, Biomass and Hybrid Dryers - BioEnergy Discussion Lists

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Chapter 1PACKAGES DEVELOPED AT AIT, ThailandPackage 1: Direct Solar Box DryerA direct-solar box-type dryer has been developed at AIT after optimizing the designparameters through a detailed study. The dryer, which operates on the natural draftprinciple, has two trays kept inside an insulated box. The trays are made ofaluminum angle frames and stainless steel wire mesh. A cover glazing, hinged atone side to the box, is fixed at the top. The glazing can be opened for loading andunloading of the dryer. The dryer is fixed on an inclined stand, facing the south. Themain parameters which determine the drying air temperature are the distances ofthe cover glass and the dryer bottom surface from the tray surface. These parametershave been optimized, to adjust airflow both above and below the trays to enhancethe air contact with the product. Figure 1.1 shows the assembled drier. The physicalparameters of the dryer are presented in Table 1.1.Products to be dried are spread on a thin layer over the two trays kept inside thebox. During operation, the hot and humid air escapes through an opening at the top,while fresh ambient air enters through a bottom opening.Figure 1.1: A fully assembled direct-solar box dryer2
Design detailsThe box dryer consists of a rectangular box made of galvanized iron (GI) sheet, withan open top. The box was insulated at the outside with glass wool, and clad with GIsheet. An aluminum frame around a 3 mm thick window glass cover was hinged tothe box at the left edge. This facilitates opening and closing of the cover glass foraccess into the box. Figures 1.2 and 1.3 illustrate the dimensional details of the dryer.7006201351520Outletopening4Aluminium'L' angle frameInlet opening(wire mesh)590 x 80G I sheet boxDimensions are in mmFigure 1.2: Dimensional details of the direct-solar box dryerTable 1.1: Technical specifications of the direct-solar box dryerSI. No. Parameter Specifications1 Type of dryer Direct solar2 Overall size - length x width 152 cm x 70.5 cm3 Height 15.5 cm4 Aperture area 0.91 cm 25 Loading (tray) area 0.84 cm 26 Air inlet/outlet areas 472 cm 2 each (59 cm x 8 cm)7 Box material GI sheet, 22 SWG8 Tray materials Aluminum frame; SS wire mesh9 Glazing 3 mm window glass10 Gap: Tray surface-Cover glass 10 cm11 Gap: Tray surface - Dryer bottomsurface2.5 cm3
Page 1: Technology Packages:Solar, Biomass
Page 4 and 5: Technology Packages: Solar, Biomass
Page 6 and 7: PrefaceIt is increasingly becoming
Page 8 and 9: NepalEr. Rishi K. B. ShahVice Presi
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Page 14 and 15: Glass cover40A - A10535Glass woolin
Page 16 and 17: The main advantage of using the gas
Page 18 and 19: LidWater sealFuel chamberGas burner
Page 20 and 21: 15Ø cylinderStud. 5/16" dia.A101"
Page 22 and 23: The ash scraper slides through a cy
Page 24 and 25: welded at the top with the water se
Page 26 and 27: Other fuels such as saw dust brique
Page 28 and 29: Figure 2.19: Thermostat used in the
Page 30 and 31: The dimensions and other design par
Page 32 and 33: stove at one end and a chimney at t
Page 34 and 35: Chapter 2PACKAGES DEVELOPED AT RECA
Page 36 and 37: ox dryer. The drawer type tray desi
Page 38 and 39: Figure 5.1: Improved solar cabinet
Page 40 and 41: Dimensions are in mm1.1.1.1.1Figure
Page 42 and 43: Package 6: Improved Solar Tunnel Dr
Page 44 and 45: Dimensions are in mmFigure 6.3: Det
Page 46 and 47: Package 7: Solar-Biomass Hybrid Cab
Page 48 and 49: Dimensions are in mmFigure 7.2: Bac
Page 50 and 51: Telescopic chimney110 cmTop cover88
Page 52 and 53: chimney is removed and the drum is
Page 54 and 55: Chapter 3PACKAGES DEVELOPED AT UP,
Page 56 and 57: Dimensions are in mmFigure 8.2: Dim
Page 58 and 59: ChimneyDryingChamber1DryingChamber2
Page 60 and 61: Package 10: Transpired Collector So
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Table 10.2: Technical specification
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Chapter 4PACKAGES DEVELOPED AT ITC,
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Figure 11.3: Fully assembled box ty
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total drying area of 2 m 2 . The dr
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The drying chamber is built with ha
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Renewable Energy Technologies in As
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