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Title: Solar-heated, forced-air, lumber dryer for tropical latitudes

Source: Solar Energy Volume 22, 1979; pp. 563-566.

Author(s): Tschernitz, John L.; Simpson, William T.

Publication Year: 1979  View PDF »

Category: Journal Articles

Abstract: Lumber to be used for most wood products requires drying before it can be manufactured into a stable finished product that will perform satisfactorily. There are two general methods of drying lumber: air drying and kiln drying. In air drying, lumber is merely stacked in the open (or occasionally in sheds) in such a way as to assure natural air circulation through the stacks. This method is slow (low temperature) and offers no control over temperature and relative humidity. This uncontrolled drying often causes cracking and distortion in the lumber if relative humidities are too low in the early stages of drying. In those stages, wood is most susceptible to damage due to the stresses (wood shrinks on drying) caused by severe moisture gradients from core to shell. Furthermore, particularly in areas where ambient relative humidity is high, wood cannot be brought to a low enough moisture content by air drying alone, because of the hygroscopicity of wood.

Keywords: solar; forced-air; lumber dryer; tropical latitudes

Publication Review Process: Non-Refereed (Other)

File size: 733 kb(s)

Date posted: 04/29/2013
RITS Product ID: 63744

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