Solar, Biomass and Hybrid Dryers - BioEnergy Discussion Lists
Solar, Biomass and Hybrid Dryers - BioEnergy Discussion Lists Solar, Biomass and Hybrid Dryers - BioEnergy Discussion Lists
Chapter 4PACKAGES DEVELOPED AT ITC, CAMBODIAPackage 11: Direct Solar Box DryerITC, Cambodia designed and developed dryers suitable for family and smallbusiness use. ITC started its adaptive research by conducting a literature survey toreview the existing solar dryer designs. Based on the study, ITC developed animproved version of a box type solar dryer (Figure 11.1).Figure 11.1: Box type solar dryerDesign detailsThe solar box dryer consists of an outer box and an inner box, with glasswoolinsulation between them. The outer box of the dryer was fabricated using mild steel‘L’ angles and GI sheets. The glazing at the top is hinged to the box at one edge, foreasy opening and closing of the dryer during loading and unloading. Ordinarywindow glass was used as the glazing material. Rubber gaskets were provided at thejoints to make them air-tight. A wire net was fixed at the air inlet opening to thedryer at the bottom, to keep the insects out. A mild steel stand supports the dryer atthe bottom. Table 11.1 presents the technical specifications of the box dryer. Thedesign of the dryer is illustrated in Figure 11.2.54
Table 11.1: Technical specifications of the solar box dryerType of dryerDirect solarOverall size - length × width x height 152 × 70 x 15.5 cmAperture area 0.91 m 2Air inlet/outlet areas472 cm 2 each (59 cm × 8 cm)Box materialGI sheet, 22 SWGTray materials Aluminum frame; SS wiremeshGlazing3 mm window glassGap: Tray surface - Cover glass 10.0 cmGap: Tray surface - Dryer bottom 2.5 cmDimensions are in mmFigure 11.2: Isometric view of the box type solar dryerThe dryer operated in natural draft principle. While the hot and humid air escapesthrough the opening at the top, fresh ambient air enters through the bottom opening.The dryer has two trays kept inside the box for loading the products to be dried. Thetrays are made of aluminium angle frames and stainless steel wire mesh. Thedistance between the tray surface, cover glass and dryer bottom surface is kept suchthat air flows both above and below the tray for maximum drying effect.The dryer box is fixed on a mild steel stand with a tilt of 20°, and placed facingsouth, to maximize the incident solar radiation (Figure 11.3).55
- Page 14 and 15: Glass cover40A - A10535Glass woolin
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- Page 42 and 43: Package 6: Improved Solar Tunnel Dr
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- Page 46 and 47: Package 7: Solar-Biomass Hybrid Cab
- Page 48 and 49: Dimensions are in mmFigure 7.2: Bac
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- Page 56 and 57: Dimensions are in mmFigure 8.2: Dim
- Page 58 and 59: ChimneyDryingChamber1DryingChamber2
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Chapter 4PACKAGES DEVELOPED AT ITC, CAMBODIAPackage 11: Direct <strong>Solar</strong> Box DryerITC, Cambodia designed <strong>and</strong> developed dryers suitable for family <strong>and</strong> smallbusiness use. ITC started its adaptive research by conducting a literature survey toreview the existing solar dryer designs. Based on the study, ITC developed animproved version of a box type solar dryer (Figure 11.1).Figure 11.1: Box type solar dryerDesign detailsThe solar box dryer consists of an outer box <strong>and</strong> an inner box, with glasswoolinsulation between them. The outer box of the dryer was fabricated using mild steel‘L’ angles <strong>and</strong> GI sheets. The glazing at the top is hinged to the box at one edge, foreasy opening <strong>and</strong> closing of the dryer during loading <strong>and</strong> unloading. Ordinarywindow glass was used as the glazing material. Rubber gaskets were provided at thejoints to make them air-tight. A wire net was fixed at the air inlet opening to thedryer at the bottom, to keep the insects out. A mild steel st<strong>and</strong> supports the dryer atthe bottom. Table 11.1 presents the technical specifications of the box dryer. Thedesign of the dryer is illustrated in Figure 11.2.54
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