In this study the process of dehydrating both dill and spearmint crops was examined at one hour
intervals by means of an inactive and indirect solar dryer, which was designed and assembled at
Shahre Kurd university department of mechanics of farm machinery, under influence of two different collectors
(iron and aluminum). The test design selected for this experiment was a complete random design which was
performed with 3 repetitions. Data analysis showed that the dried crop type factor, collector’s type and duration
of sampling in crop’s water loss were significant at 1% statistical level. Data showed that average water loss
of spearmint crop was 6% more than dill at each hour. This is because different physical and textural properties
of plants. Also comparison of amount of water evaporation in different durations for both iron and aluminum
collectors showed that average amount of water evaporation in dryer with iron collector is 10% more than the
one with aluminum collector. Also statistics indicated that crops dehydrated with solar dryers are more
favorable and benefit higher qualities from the viewpoint of marketplace. As the tendency to buy dehydrated
dill and spearmint crops with solar dryers is 2 and 2.4 times, respectively, higher than the crops dehydrated by
traditional dryers.