A steel pipe (k = 48 W/m∙K) of a heating system carries wet steam at 120 °C. The inner and outer diameters of the pipe are 15 cm and 16 cm respectively. The pipe is insulated on the outside with rockwool insulation (k = 0.05 W/m∙K) of thickness 8 cm. The ambient air temperature is 32 °C. The outside heat transfer coefficient is 20 W/m2∙K. The thermal resistance between the inner pipe surface and the steam is negligible. Calculate the rate of heat flow (in W) from the steam to the ambient over a 5 m length of pipe. calculate the temperature (in °C) of the outer surface of the insulation. calculate the rate of condensation of steam (in kg/hr) over the 5-m length of pipe if the latent heat of steam is 2200 kJ/kg.
A steel pipe (k = 48 W/m∙K) of a heating system carries wet steam at 120 °C. The inner and outer diameters of the pipe are 15 cm and 16 cm respectively. The pipe is insulated on the outside with rockwool insulation (k = 0.05 W/m∙K) of thickness 8 cm. The ambient air temperature is 32 °C. The outside heat transfer coefficient is 20 W/m2∙K. The thermal resistance between the inner pipe surface and the steam is negligible. Calculate the rate of heat flow (in W) from the steam to the ambient over a 5 m length of pipe. calculate the temperature (in °C) of the outer surface of the insulation. calculate the rate of condensation of steam (in kg/hr) over the 5-m length of pipe if the latent heat of steam is 2200 kJ/kg.
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