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Alternative TitleSolar thermal processes in Thailand - Study on natural convection cabinet drying
ImprintBangkok : National Energy Administration, 1984
Call# T930079

CALL # Volume Number Month Year Barcode Status

AbstractSix types of solar air heaters for a cabinet-type solar dryers were constructed, tested and evaluated. The cover, front and sides of the cabinet were made of transparent glass sheets of 3mm. thick. Inside surfaces of the back and floor of the cabinet were coated with a black paint. Three types of transparent covers, viz. glass, acrylic plastic and fibre-reinforced plastic, were employed onthe air heaters. Two types of absorbing surfaces namely black metal lathe and a black mild steel sheet at the middle of the air gap were evaluated. Pieces of wetcloths folded in rectangular blocks were used as the test materials. The exit area for the moist air from the dryer was set at the optimum value. -- The air heater having glass cover and an absorbing plate at the middle of the air gap gives the highest drying efficiency. Economic analysis by the annual cost method indicates that the cost of useful energy gain, from the dryer andair heater having glass cover and an absorbing plate at the middle of the air gap, is about US CENT 3/kWh if the useful life of 5 years is assumed.
Descript108 p
SubjectSolar dryer
Solar thermal process