Solution Ideal gas,n=1.3≠1 nR 12 -T) (ideal gas,.n≠l) rev Polytropic process equation: (1.3-1)/1.3 T=T( =293 =425K Then, Wev nR 1.3 8.314kJ i n=-T）= 1.3-1 28.97kg·K (425-293)K=-164.2kJ/kg To find Q/m,use mass energy balance equation Ccv Wev -T1,T2,table A-17 m m h2-h =-164.15+(426.35-293.17)）=-31kJ/kg 上游充通大 April 28,2019 8 SHANGHAI JIAO TONG UNIVERSITYApril 28, 2019 8 Solution Ideal gas, n=1.3 ≠ 1 ? Polytropic process equation: Then, To find Q/m, use mass & energy balance equation T1 , T2 , table A-17