ABSTRACT

The main contents of this thesis includes the design and construction of a natural convection & radiation heat transfer equipment. With this equipment the heat transfer rate from a body by different modes can be found. The emissivity and the heat transfer coefficient of the body can also be determined. The total heat supplied to the element (heating element) is transferred in three modes. Heat transfer by conduction process can easily be measured. If the element  in very low pressure or in a vacuum then the heat transfer by convection process become negligible and the total heat transfer by radiation process can be easily determined. And thus emissivity of the element can be determined. It was assume that the G.I sheet was mild steel. And the pressure vessel was made by G.I sheet. But when the vessel was making vacuum, air pressure squeezed the vessel and the equipment failed. Then it was necessary to analysis the case of failure. Moreover, the analysis of the G.I sheet by universal testing machine, it was seen that the properties (hardness, toughness, stress, etc...) of the sheet was not same the mild steel properties. Then necessary to analyze the case of tangential, compression & buckling where the equipment failed. As a result of analysis, buckling was the main cause of failure. In order to eliminate this failure, the properties of the sheet have to consider first.This work will help the beginner who wants to proceed in this field.

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