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Steam at Too,1 340 °C flows in a cast iron pipe [k- 80 W/m.°C] whose inner and outer diameter are Di 6 cm and D2 -8 cm, respectively. The pipe is covered with a 4-cm thick glass wool insulation [k-0.05 W/ m°C]. Heat is lost to the surroundings at Too,2 - 21°C by natural convection and radiation, with a combined heat transfer coefficient of h- 18 W/m2 °C. Taking the heat transfer coefficient inside the pipe to be h 60 W/m2 °C, determine the rate of heat loss from the steam per unit length of the pipe. Also determine the temperature drop across the pipe shell and the insulation T3 T: T2 Insulation Figure 2. Schematic of problem 3 Note: For problem 2 and 3; Draw the thermal resistance. Show all the steps of the calculations for all the In(2 i rectangular geometry; Rcond-cylindrical geometry: Rcondkh problems.Rconv AT 0 Problem 3 (30): Steam at Too,1 340 °C flows in a cast iron pipe [k- 80 W/m.°C] whose inner and outer diameter are Di 6 cm and D2 -8 cm, respectively. The pipe is covered with a 4-cm thick glass wool insulation [k-0.05 W/ m°C]. Heat is lost to the surroundings at Too,2 - 21°C by natural convection and radiation, with a combined heat transfer coefficient of h- 18 W/m2 °C. Taking the heat transfer coefficient inside the pipe to be h 60 W/m2 °C, determine the rate of heat loss from the steam per unit length of the pipe. Also determine the temperature drop across the pipe shell and the insulation T3 T: T2 Insulation Figure 2. Schematic of problem 3 Note: For problem 2 and 3; Draw the thermal resistance. Show all the steps of the calculations for all the In(2 i rectangular geometry; Rcond-cylindrical geometry: Rcondkh problems.Rconv AT 0
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