A steel tube with a thermal conductivity of 55 W/m.K carries a fluid at 175°C, with a convection heat transfer coefficient of 190 W/m²./K. The tube has an external diameter of 5 cm, a wall thickness of 1 cm and a length of 1.5 m. The ambient air and surroundings are at 27°C, with a convection heat transfer coefficient of 20 W/m².K. Neglecting the effects of radiation, determine: a) The temperature of the outer surface of the tube b) The total resistance considering the effects of radiation only on the outside, with the coefficient hr = 2W/m².K
A steel tube with a thermal conductivity of 55 W/m.K carries a fluid at 175°C, with a convection heat transfer coefficient of 190 W/m²./K. The tube has an external diameter of 5 cm, a wall thickness of 1 cm and a length of 1.5 m. The ambient air and surroundings are at 27°C, with a convection heat transfer coefficient of 20 W/m².K. Neglecting the effects of radiation, determine:
a) The temperature of the outer surface of the tube
b) The total resistance considering the effects of radiation only on the outside, with the coefficient hr = 2W/m².K
c) 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.
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