The heat loss to the gas if the length of the pipe is 5.0 ? b. The temperature drop due to the thermal resistance of the hot gases, that of the steel tube, the insulation layer and the outside air.
A hot gas is flowing through a steel pipe with an outside diameter of 8.0 m and a thickness of 1.3 m. The convective heat transfer coefficient in the gas zone is 220.0 ?/?2?. The pipe is covered by an insulating material whose thickness is 2.0 ?? and thermal conductivity is 0.2 ?/??. The outside of the insulating material is exposed to ambient air and the convection heat transfer coefficient has been measured, its value being 55.0 ?/?2? ⁄ . You are asked to determine:
a. The heat loss to the gas if the length of the pipe is 5.0 ?
b. The temperature drop due to the thermal resistance of the hot gases, that of the steel tube, the insulation layer and the outside air.
The thermal conductivity of steel is 50.0 ?/??
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