Isentropic process for Ideal gas -air,cont. For the special case of air: -(网a）… P2 Pr (s=S2,air only Only f(T),marked as v(T) Pr Relative volume PROPERTY TABLES AND CHARTS But not truly a volume TABLE A-17 Ideal-gas properties of air U2 T t s U2 K kJ/kg P kJ/kg V. kJ/kg.K (s=52,air only) 200199.97 0.3363 142.56 1707.0 1.29559 Url 210 209.97 0.3987 149.69 1512.0 1.34444 220 219.97 0.4690 156.82 1346.0 1.39105 230 230.02 0.5477 164.00 1205.0 1.43557 240 240.02 0.6355 171.13 1084.0 1.47824 250 250.05 0.7329 178.28 979.0 1.51917 260 260.09 0.8405 185.45 887.8 1.55848 where v =v(T1)and v2=v(T2) 270 270.11 0.9590 192.60 808.0 1.59634 280 280.13 1.0889 199.75 738.0 1,63279 285 285.14 11584 203.33 706.1 1.65055 上通大学 April 28,2019 5 SHANGHAI JIAO TONG UNIVERSITYApril 28, 2019 5 Isentropic process for Ideal gas –air, cont. For the special case of air: Only f(T), marked as vr (T) Relative volume But not truly a volume where vr1 = vr (T1 ) and vr2 = vr (T2 )