Combustion study of 35 mm diameter briquettes made from groundnut shell was carried
out in the improved metal Chula having thermal efficiency of 24%. Firstly a single layer
(35 mm diameter and 12–18 mm length) was maintained in the Chula. A small amount of
diesel was spread over it for easy firing. It took 10 min for initial combustion. It was found
that 1.04 kg briquettes took around 30 min for complete combustion. During combustion