Superheated steam at an average temperature of 200°c is transported through a steel pipe (k=50 w/m-k, do = 8 cm, di = 6 cm and l = 20 m). the pipe is insulated with a 4 cm thick gypsum plaster (k=0.5 w/m-k). the insulated pipe is placed horizontally in a warehouse where the average temperature is 10°c. the steam and air side heat transfer coefficients are 800 and 200 w/m²- k respectively. calculate a) rate of heat transfer from the superheated steam b) outside surface temperature of the insulation.

Liquid flows at steady state at a rate of 2 lb/'s through a pump, which operates to raise the elevation of the liquid 100 ft from control volume inlet to exit. the liquid specific enthalpy at the inlet is 40.09 btu/lb and at the exit is 40.94 btub. the pump requires 3 btu/s of power to operate. if kinetic energy effects are negligible and gravitational acceleration is 32.174 tt/s, the heat transfer rate associated with this steady state process is most closely 1)-2,02 btu/s from the liquid to the surroundings 2)-3.98 btu/s from the surroundings to the liquid. 3)-4.96 btu/s from the surroundings to the liquid. 4)-1.04 btu/s from the liquid to the surroundings.