In this communication, a new design of thin layer bed crop drying cum
water heater has been proposed and analysed for making the whole syste
m operate throughout the year. Energy balance equations for each compo
nent of the system have been used to predict the analytical results. T
he system can be used to provide hot water in case the drying system i
s not in operation. The water heater below the air heater systems will
act as a storage material for drying the crop during off sunshine hou
rs. (C) 1997 Elsevier Science Ltd.