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Source
Indian Forester, Vol 109, No 5 (1983), Pagination: 309-312
Abstract
Packed hed type solar air heaters having total collector area 10.3 m3 in 11 m length have been found to yield maximum outlet air tempentures between 90°C and 105°C during April to June at Dehra Dun at air mass flow rates between 2.77 and 5.54 kg/min. Average journal solar collection efficiencies varied between 45.5 and 62%. It is established that temperatures suitable for accelerate drying of veneer, sheet materials, wood wool and minor forest produce on a cottage or small scale can be easily and cheaply achieved by these solar air healers. A 10.3 m2 collector area has been estimated to sulie for a charge capacity of 51 m3 of 2 m n thick green veneer (chargetime 3½ hrs), somewhat more than 28 kg of sal seed (charge time 6½ hrs), and more than 900, 10-leaf bundles (charge 6½ hrs). Possibilities of supplemental solar heating of existing steam heated dryers by this system also exist.
