An analytical and experimental study of open sun drying and a cabinet tyre drier

Abstract

This communication presents a simple analytical model of open sun drying and a cabinet type drier. Also, an extensive experimental study of the two methods of drying has been conducted on typical summer days (1–2 June) of the New Delhi climate during 1982. The analytical models are helpful in predicting the hourly variation of product temperature and moisture content under constant rate and falling rate periods of drying. These are based on the principle of simultaneous heat and mass transfer at the product surface and include the effects of wind speed, relative humidity, product thickness and heat conducted to the ground. The computations correspond to typical summer (1–2 June) and winter (6–8 December) days of the New Delhi climate during 1982. This analysis has been illustrated by specific examples of apples, peaches, cherries and mango flesh.