m.K carries a fluid at 200°C, with a convection heat transfer coefficient of 210 W/m2./K. The tube has an external diameter of 5 cm, a wall thickness of 1 cm and a length of 2 m. The ambient air and surroundings are at 25°C, with a convection heat transfer coefficient of 25 W/m2.K. Neglecting the effects of radiation, determine: 1) The total resistance considering the effects of radiation only on the outside, with the coefficient hr = 2W/m2.K 2) The new heat transfer rate, considering the effects of radiation, if an additional layer of 15 mm thick foam with a conductivity of
A steel tube with a thermal conductivity of 45 W/m.K carries a fluid at 200°C, with a convection heat transfer coefficient of 210 W/m2./K. The tube has an external diameter of 5 cm, a wall thickness of 1 cm and a length of 2 m. The ambient air and surroundings are at 25°C, with a convection heat transfer coefficient of 25 W/m2.K. Neglecting the effects of radiation, determine:
1) The total resistance considering the effects of radiation only on the outside, with the coefficient hr = 2W/m2.K
2) The new heat transfer rate, considering the effects of radiation, if an additional layer of 15 mm thick foam with a conductivity of 0.03 W/m.K is added to the system.
3) The critical insulation radius of the system after adding this insulating layer.
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