Drying Bananas with a Modified Hot Air Dryer Using Waste Heat from a 200 Liter Kiln
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Abstract
The purposes of this research are to modify hot air dryer by using waste heat from a 200 liter kiln for drying bananas and to investigate its drying performance by assessing
its drying rate and specific energy consumption. The main parts of the dryer consist of drying chamber that has dimensions of 0.72 × 1.2 × 0.63 m3, air circulation system and heat exchanger which receives waste heat from the exhaust tube and kiln surface. For the experiment, an initial moisture content of 30 kg bananas was prepared at
239.60±20.30 %dry basis. Drying temperature was set at 60±4oC while drying air velocity was set at 0.6 to 1.8 ms-1. All experiments were carried out in triplicate and the drying period was measured from the initial moisture content less final moisture content, 59.06±6.77 %dry basis. An air velocity of 1.8 ms-1 was the optimal condition in this
experiment. It had the highest drying rate at the lowest specific energy consumption. The results of the average drying rate and the average specific energy consumption
were 0.87±0.004 kgwater h-1 and 51.12±0.70 MJ kgwater -1, respectively.
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References
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