INSULATION OF BOX AND GI PIPE
For determining the actual heat transfer rate through the fin, proper insulation is too much important. So all the open surfaces of material except fins should be properly insulated. As thermal conductivity of asbestos, cotton, saw dust are very low, so box was insulated by the above materials. At first the box was insulated by a heavy coating of asbestos (loosely packed), then the box was insulated by a thick layer of cotton. Box, was also painted inside by heat resistant paint. M S plate was insulated by a thick layer of plaster of Paris and sawdust. GI pipe was insulated by a layer of heat resistant paint and also coated by a thick layer of cotton.

WORKING PROCEDURE
It is known that temperature remains constant during latent heat of condensation. Thus in this project work the principle of latent heat of condensation was applied for maintaining constant temperature at the plate. The steam was generated in a container by applying heat and was supplied to a rectangular metallic box through an inlet pipe. The temperature of inlet steam was measured by a thermometer, placing at inlet pipe. Fins were attached at the one side of the rectangular box. The plate along with fins was locked with the box by nut and bolts and was sealed by using gasket. There were three plates along with three different fin combinations. The plate could be easily removed and might set-up another plate in the box. By placing a certain plate in the box 100 °C steam at 100 'C was supplied in the box. The fin received heat from steam and transferred heat to atmosphere. As a result the steam considered due to release of latent heat of condensation. The condensed water was delivered by outlet pipe and collected in a beaker. By measuring the mass or condensed water, the heat transfer rate of
Fin was obtained by applying the following formula:
Q = ml/t (watt)
The experimental data were taken after 3 to 4 hours placing a plate in the box. The time for each reading were 3 minutes (180 seconds)