Abstract
The integral type natural circulation solar crop dryer is simulated to include the effects of varying ambient conditions of air temperature and humidity and diffuse and beam components of solar radiation. The total daily entropy generated by the system, comprising contributions from absorption of solar radiation at the crop temperature, heat transfer in the system, moisture evaporation from the crop, fluid friction generated by the working fluid and the energy stored in the thermal mass of the system, is calculated. It is shown that operating the dryer at conditions of minimum entropy generation yields a useful criterion for choosing dryer dimensions and is compatible with the desire to maintain allowable limits on crop temperature.
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