Keywords: solar tunnel dryer, grape drying, drying rate, moisture content, chemically untreated grapes, solar energy, solar power, renewable energy
Performance evaluation of solar tunnel dryer for grape drying
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.