Example 36.1 polytropic compression of air T2=425K 2 5bar Known:p1=1bar,T1=20C;p2=5bar n=1.3 pu3=constant Find: & -1 bar m m Shaded area=magnitude of (We)in rev Air compressor Assumptions: 1.SS,CV. 2.polytropic process,n =1.3. 3.air as an ideal gas. 4.△PE,△KE neglected 上游充通大学 April 28,2019 7 SHANGHAI JIAO TONG UNIVERSITYApril 28, 2019 7 Example 36.1 polytropic compression of air Known: p1 =1bar, T1=20℃; p2=5bar n=1.3 Find: & Assumptions: 1. SS, CV. 2. polytropic process, n = 1.3. 3. air as an ideal gas. 4. ∆PE, ∆KE neglected Air compressor