Question

At steady state, 1.8 lb/s of hot gaseous products of combustion cool from p1 = 18.0 lbf/in2, T1 = 2400°F to p2 = 16.0 lbf/in2, T2 = 260°F as they flow through a pipe. Heat transfer from the gas occurs at a boundary temperature of Tb = 230°F. Use the ideal gas model with Cp = 0.25 Btu/lb.°R and an average molecular weight, M = 27.5 lb/lbmol. Let To = 60°F and ignore the effects of motion and gravity.

Determine the exergy transfer accompanying heat transfer from the gas, in Btu/s.

Answer 1