Effect of air flow rate and plant type on the cost and efficiency of the performance of the indirect solar dryer

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Research Paper 01/02/2018
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Effect of air flow rate and plant type on the cost and efficiency of the performance of the indirect solar dryer

Hussein Abbas Jebur, Hawraa Flaeih Al-Maeny
J. Bio. Env. Sci.12( 2), 68-76, February 2018.
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The solar dryer is designed and manufactured to dry some medical plants at the Research Center for Energy and Environment of the Ministry of Industry and Minerals. This experiment was included two factors, where three levels speeds for the fan and three kind of medical plants. Factorial experiment within CRD  with three replications  was used to study the effect of the dried substance type ,air flow rate and their overlap with  studied parameters. The results indicated that the increased intensity of the fallen solar radiation resulted in a lower efficiency of the solar dryer from 17.95 % to 12.18 %. Increased air flow rates reduce the water mass from 0.21 kg to 0.185 kg during the day as a result of lower temperatures within the drying room and thus a decrease in the efficiency of the dryer. Increasing speed leads to lower temperatures, which in turn reduces the extraction of moisture from the plant and thus decreases the moisture mass of the vaporist. The binary overlap between substance type and air flow rate has had a moral effect on most of them efficiency drying room, rate of drying, efficacy of the medicinal plant and daily costs. The alcohol extract of ginger was more effective against the growth of E. coli bacteria than the rest of the extracts where the diameters ranged 20-25 mm. The alcohol extract of the pepper was effective against the growth of the Staphy.aureus bacteria better than the rest of the extracts where the diameters ranged (11-17) mm.


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