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Energy and the Environment, 1999

ISSN:
1-56700-127-0 (Print)

OPTIMAL INSULATION OF DUCTS SUBJECTED TO EXTERNAL THERMAL RADIATION

Ahmet Z. Sahin
Mechanical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia

Abstract

Optimum insulation thickness of a circular duct subjected to external radiative heat transfer is studied for a given amount of insulation material. A circular duct through which fluid is transported from one end to the other is considered. Variations of the bulk temperature of the fluid as well as the temperatures of the inner surface of the tube and the outer surface of the insulation are evaluated. It is shown that it is possible to achieve an optimal thickness variation of insulation which minimizes the heat losses to the ambient.