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Steam at 450 F is flowing through a steel pipe (k=8.7 Btu/h ft F) whose inner and outer diameters are 3.5 in and 4.0 in, respectively, in an environment at 55 F. The pipe is insulated with 2-in-thick fiberglass insulation (k=0.020 Btu/h ft F). If the heat transfer coefficients on the inside and the outside of the pipe are 30 and 5 Btu/ h ft^2 F, respectively, determine the rate of heat loss from the steam per foot length of the pipe. What is the error involved in neglecting the thermal resistance of the steel pipe in calculations?

Steam at 450 F is flowing through a steel pipe (k=8.7 Btu/h ft F) whose inner and outer diameters are 3.5 in and 4.0 in, respectively, in an environment at 55 F. The pipe is insulated with 2-in-thick fiberglass insulation (k=0.020 Btu/h ft F). If the heat transfer coefficients on the inside and the outside of the pipe are 30 and 5 Btu/ h ft^2 F, respectively, determine the rate of heat loss from the steam per foot length of the pipe. What is the error involved in neglecting the thermal resistance of the steel pipe in calculations?