申論題

2. (15%) Air (molar mass - 28.851 g/mol) enters a compressor through a 5-cm-radius tube with an average velocity of 10 m•s^-1 at the initial conditions [P₁ = 1 bar and T₁ = 10℃], and is discharged through a 1.5-cm-radius tube at the final conditions [P₂ = 36 bar and T₂ = 90℃]. The shaft work supplied to the compressor is 25.0 kJ-mol^-1. Determine the heat-transfer rate (kJ/sec) from the compressor? Assume enthalpy and specific volume at initial condition are 30.68 kJ mol^-1and 31.40 L ' mol^-1, respectively, while enthalpy and specific volume at final condition are 33.97 kJ ㆍ mol^-1 and 0.5438 L ㆍ mol^-1, respectively.