Solar drying experiments of Andrographis paniculata were conducted in Nakhon Pathom, Thailand. For this purpose,
a new type parabolic-shaped solar tunnel dryer was designed and manufactured. Solar dryer consisted of a flat-plate
solar collector and a drying tunnel. The collector and the drying tunnel were covered with polycarbonate plates to
reduce heat losses and placed in series. Heated air in solar air collector was forced through Andrographis paniculata
by DC-fans driven by 15 W solar cell modules. The total area of the collector was 108 m2. During the drying period,
drying air temperature, relative humidity, air flow rates, solar radiation, and lose of mass were measured at different
parts of the dryer for every 10 minutes. To investigate its performance, the dryer was used to dry 100 kg of
Andrographis paniculata. The dryer could be used for Andrographis paniculata of 75% (wb) moisture content, and
they could be dried within 2-3 days, with 7% (wb) remaining moister. The products being dried in the dryer got the
heat from both the sunlight and the collectors. They were completely protected from rain, animals, insects and the
dried products are of high quality. However, the temperature of the drying air was varied between 35 - 75 oC, depends
on the weather conditions
Solar drying experiments of Andrographis paniculata were conducted in Nakhon Pathom, Thailand. For this purpose,a new type parabolic-shaped solar tunnel dryer was designed and manufactured. Solar dryer consisted of a flat-platesolar collector and a drying tunnel. The collector and the drying tunnel were covered with polycarbonate plates toreduce heat losses and placed in series. Heated air in solar air collector was forced through Andrographis paniculataby DC-fans driven by 15 W solar cell modules. The total area of the collector was 108 m2. During the drying period,drying air temperature, relative humidity, air flow rates, solar radiation, and lose of mass were measured at differentparts of the dryer for every 10 minutes. To investigate its performance, the dryer was used to dry 100 kg ofAndrographis paniculata. The dryer could be used for Andrographis paniculata of 75% (wb) moisture content, andthey could be dried within 2-3 days, with 7% (wb) remaining moister. The products being dried in the dryer got theheat from both the sunlight and the collectors. They were completely protected from rain, animals, insects and thedried products are of high quality. However, the temperature of the drying air was varied between 35 - 75 oC, dependson the weather conditions
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