Solar, Biomass and Hybrid Dryers - BioEnergy Discussion Lists

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Glass cover40A - A10535Glass woolinsulation620700Dimensions are in mmG.I. sheet claddingSection A - AAluminium channelRubber beadingGlass coverRubbersheetinsulationAluminiumhingeAluminiumangle frameGlass woolinsulationNot to scaleFigure 1.3: Sectional views of the box dryerThe box dryer was aimed at rural households, and tested with a number of fruitsand vegetables, including apple, banana, chilly, mushroom and radish. The dryercould provide an average drying air temperature of 50-55°C inside the dryingchamber. Drying is much faster compared to open sun drying, and the driedproducts were found to be of good quality.4
Package 2: Solar-Biomass Hybrid Cabinet DryerSmall-scale drying based on electricity, coal, LPG and other fossil fuels is normallyexpensive. Moreover, combustion of fossil fuels emits greenhouse and other gases.Solar drying is an attractive option to solve some of these problems. However, aninherent problem of solar drying is that it depends entirely on the weather and is notpossible to use during night-time.Biomass is locally available in rural areas of developing countries and is often thecheapest source of energy. In addition, biomass fuels can provide an uninterruptedsupply of thermal energy needed for continuous operation of dryers. Hybrid dryingpowered by biomass and solar energy is a potentially important option for smallscaleoperations since it combines the advantages of drying systems operated bysolar energy alone and those operated by biomass alone. During sunny weather, thedryer is operated in the solar mode which reduces the need for biomass fuels andassociated costs. Use of biomass fuels, however, enables a continuous day and nightoperation even during cloudy or rainy weather.A hybrid cabinet dryer with an automatic temperature control mechanism has beendeveloped at AIT for drying agricultural products. The hybrid pairs a domesticgasifier stove (DGS), developed at AIT, and a flat plate solar air heater to supply hotair for drying products inside a cabinet. The technical specifications of the dryer arepresented in Table 2.1.Table 2.1: Technical specifications of solar-biomass hybrid cabinet dryerSI. No. Parameter Specifications1. Solar Collector type Flat plate air-heating solar collector2. Solar Collector size 2m x 2m3. Drying chamber dimensions 2m (length) x 2m (breadth) x 1.95m (height)4. Drying chamber construction Bricks and mortar5. No. of trays 16 nos.6. Total tray area 14 m 27.No. of doors for loading/unloading4 nos., two at each side8. Stove type Natural convection cross-flow gasifier stove9. Gasifier stove capacity 4.5 kW (thermal)10. Fuel for gasifier stove Wood chips, wood twigs, briquette pieces11. Heat exchanger type Pipe heat exchanger12. Airflow inside the drying chamber Natural convection, with chimneys13. Temperature controller Thermostat-based, mechanical lever control5
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 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
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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Solar, Biomass and Hybrid Dryers - BioEnergy Discussion Lists

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