Solar, Biomass and Hybrid Dryers - BioEnergy Discussion Lists

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stove at one end and a chimney at the other. Noting that the maximum permissibletemperature for fruits and vegetable drying is about 60°C, the design temperature atthe outlet of the heat exchanger should not be less than this value.Eight galvanised iron (GI) pipes with outer diameter 50 mm and inner diameter 44mm are used to provide the required heat transfer area of the heat exchanger; thetubes are arranged in a staggered manner, as shown in Figure 3.2. The tube bank isplaced inside mild steel shell of length: 1.72 m, width: 0.6 m and height: 0.16 m.120mm70mmFigure 3.2: Arrangement of tubes in the heat exchangerThe stove is made of mild steel and has a cross-sectional area of 0.3m x 0.275m andheight 0.4 m; it has a grate punched with 44 holes of diameter 1.5 cm. The insidewalls of the stove are insulated with castable refractory cement. For supplyingdrying air at 70°C, the rate of briquette consumption is about 2.45 kg/hr.The chimney, which provides the draft needed for flue gas from the stove to flowthrough the heat exchanger tubes, has a cross-sectional area of 0.275m x 0.16m andheight 1 m.Figure 3.3: Biomass stove-heat exchanger unit without insulation22
Figure 3.3 shows the biomass stove-heat exchanger unit, with the chimney attachedto it. The heat exchanger is insulated with a 100 mm thick layer of rockwool and cladwith 1 mm thick aluminium sheet, to reduce thermal losses.To reduce the uneven temperature distribution across the tunnel, two 12 V/6 W DCfans are used downstream of the heat exchanger to mix the hot air so that the airtemperature is uniform across the tunnel, before it enters the dryer.23
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 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
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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