Solar, Biomass and Hybrid Dryers - BioEnergy Discussion Lists

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Chapter 3PACKAGES DEVELOPED AT UP, PHILIPPINESPackage 8: Solar-Biomass Hybrid Cabinet Dryer – FD50The Solar Laboratory at University of Philippines Diliman (UPSL/UPD) and theInstitute of Agricultural Engineering under University of Philippines Los Banos(IAE/UPLB) developed several models of renewable energy-based dryers withimproved features under the RETs in Asia program, for drying fruits, fish and herbalproducts.One of the dryers developed by IAE/UPLB was a cabinet type solar-biomass hybriddryer suitable for small-scale drying applications with a capacity of about 50kg/batch (Figure 8.1). The dryer uses a solar collector during daytime operation, anda biomass stove for operation during cloudy weather conditions and at night.Figure 8.1: Drying chamber and biomass stove of the FD-50 Dryer44
Design detailsThis cabinet type dryer, referred to as Model FD-50, has three main components:solar collector, drying chamber, and biomass stove. The air-heating solar collector isof flat plate type, and has an absorber area of 1.9 m 2 . The drying chamber of has 30aluminum wire net trays to hold the products. An exhaust fan powered by a 45 Welectric motor fixed in the chimney of the drying chamber forces ambient air to passthrough the collector. The air thus forced gets heated while passing through thecollector, and rises up through the several trays on which the products being driedare spread in thin layers. The biomass gasifier stove assists drying whenever solarradiation is insufficient.Table 8.1: Technical specifications of the hybrid cabinet dryer FD50Sl. No. 2 Parameter Specification1. Capacity per batch 50 kg sliced fruit2. Drying time 18 hrs3. Drying air temperature up to 60°C4. Airflow rate 0.05 m 3 /hr5. Dimensions 1.4×1.0×2.69 m6. No. of trays 30 of 0.98×0.5 m7. Solar collector area 2.12×0.9 m8. Collector air gap 0.05 m9. Fuel type Coconut shell/charcoal10. Fuel consumption 2.0 kg/hrSolar CollectorThe solar collector has a matt black-coated GI absorber sheet, and a single Plexiglascover positioned about 5 cm above the absorber. The metal walls of the collector boxare insulated with 8 cm thick glass wool to reduce heat losses. The solar collectorsupplies the hot air required for dryer operation during the day time. Thedimensional details of the collector are presented in Figure 8.2.The solar collector is attached to the backside of the drying chamber at an angle of15° to the horizontal. Hot air from the collector enters the drying chamber at thebottom and rises through the several trays which hold the products to be dried. Afan inside the drying chamber assists the flow of hot air from the collector upthrough the trays.45
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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 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 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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