Solar, Biomass and Hybrid Dryers - BioEnergy Discussion Lists

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Package 6: Improved Solar Tunnel DryerThe improved solar tunnel dryer consists of several flat plate air-heating solarcollector modules and drying chambers connected in series in a particular layout,thus forming a 17m long tunnel. A 370W AC exhaust fan connected at the rear endof the tunnel sucks ambient air into the tunnel. Warm, moist air leaves the tunnelthrough the exhaust fan. Figure 6.1 illustrates the improved solar tunnel dryer.Figure 6.1: Improved solar tunnel dryer(split into two parts and connected using a U-connector)Design detailsThe solar collector and drying chamber frames of the dryer are made of wood,insulated with glass wool, and glazed at the top with ordinary window glass, whichis inexpensive and readily available in the local market. Figure 6.2 presents theconfiguration of the collector-dryer modules.Dimensions are in mmFigure 6.2: Top and side views of the solar tunnel dryer32
Technical specifications of the improved solar tunnel dryer are given in Table 6.1.Table 6.1: Technical specifications of the solar tunnel dryerSl. ParameterNo.1. Mode of drying Direct2. No. of glazing Single3. No. of trays 16Specifications4. Air circulation Forced, 370 W, AC exhaust fan5. Collector area 24 m 26. Drying capacity 70 kg-fresh7. Constructionmaterials8. Approx. cost NRs. 200,000**1 US$ = 74 NRs (Nepalese Rupees), March 2004Wood, steel section, aluminum sheets, GIsheets, window glass, glass wool, aluminiumscrews and rivetsSolar Collector modulesSix solar collector modules heat the ambient air forced into the tunnel by the blowerfixed at one end. Four of the six collector modules are fixed at one end, next to theblower, while two collectors are located in the middle. These two solar collectormodules help prevent condensation of moisture on the inner surface of the glasses,by maintaining the temperature of air inside the tunnel at reasonably high levels.The design details of the individual solar collector modules are presented in Figure6.3. Each module has an outer box and an inner box, with glass wool insulationbetween them. The collector frame is made of wood and mild steel sheet. Acorrugated sheet GI absorber, coated with flat black paint, is fixed inside the innerbox. 4mm thick window glasses are used for glazing the collector.Mild steel angles provide the necessary structural support for the collector-dryerassembly.Dryer modulesEight dryer modules are fixed between the solar collector modules, as shown inFigure 6.2. Each dryer module has two partitions, and each partition has two traysand a glass door hinged at one side of the door frame. The glass doors can be openedat the top, for loading and unloading of the product. The trays are made ofaluminum frames and stainless steel wire mesh, on which the products to be driedare loaded in a thin layer. Figure 6.4 illustrates the design of a single dryer module.33
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
Page 10 and 11: viii
Page 12 and 13: Chapter 1PACKAGES DEVELOPED AT AIT,
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 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
Page 62 and 63: Table 10.2: Technical specification
Page 64 and 65: Chapter 4PACKAGES DEVELOPED AT ITC,
Page 66 and 67: Figure 11.3: Fully assembled box ty
Page 68 and 69: total drying area of 2 m 2 . The dr
Page 70 and 71: The drying chamber is built with ha
Page 72: Renewable Energy Technologies in As

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