Example 15.1 Air,polytropic compression,from p=1 bar,T1=22C to p2 =5 bars. Employing the ideal gas model,determine the work and heat transfer per unit mass,in kJ/kg,if n 1.3. 5 bars Air W pul3=constant P1=1 bar T1=22℃ P2=5 bars 1 bar Assumptions: 1.The air is a closed system. 2.The air behaves as an ideal gas. 3.The compression is polytropic with n 1.3. 4.There is no change in kinetic or potential energy. 上游充通大 Mar/15,Wed,2017 8 SHANGHAI JLAO TONG UNIVERSITYMar/15, Wed, 2017 8 Example 15.1 Air, polytropic compression, from p1 = 1 bar, T1 = 22˚C to p2 = 5 bars. Employing the ideal gas model, determine the work and heat transfer per unit mass, in kJ/kg, if n = 1.3. q w Assumptions: 1. The air is a closed system. 2. The air behaves as an ideal gas. 3. The compression is polytropic with n = 1.3. 4. There is no change in kinetic or potential energy