Inderscience Publishers

Performance evaluation of solar tunnel dryer for grape drying

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This paper presents the performance of solar tunnel dryer to dry chemically untreated grape. Average air temperature rise in dryer was in the range of 20-21?C above the ambient temperature and it was almost constant in the dryer. The solar tunnel dryer of size 10 ? 3.75 m² is in position to dry 320 kg of grapes from 85% (wb) moisture content to 16% (wb) moisture content within seven days. Developed solar dryer works at temperature between 55-70?C, therefore, there is scope for saving conventional fuel by adoption of solar energy-based drying operation.

Keywords: solar tunnel dryer, grape drying, drying rate, moisture content, chemically untreated grapes, solar energy, solar power, renewable energy

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