E2.8 Polytropic Process

Example 2.8: The same gas as in the previous example is compressed polytropically (n = 1.25) from 1 atm and 70 °F to 5 atm. Find point and path functions. V₁ = 386.6 ft³/lbmol

Solution

Final temperature, T₂ (Equation 2.28):

Internal energy change, ΔU (Equation 2.22):

Specific heat at polytropic compression C_n (Equation 2.29)

Heat added to the system, Q (Equation 2.30)

Work done by the system, W (Equation 2.21)

Enthalpy change, ΔH (Equation 2.24)

Entropy change, ΔS (Equation 2.31)

Final volume, V₂ (Equation 2.32)