Heat transfer of a polytropic process for ideal gas n=0 Cp =KCy Energy balance (1st law): n=1 Cr→0 (ideal gas,n≠1) n=k C,→0 -c西-)-0 n=士oo C --0 n- G-T) n-1 q=△u+w !No m,V→v (ideal gas,n=1) =c (G-T)+RTI Because“w' instead of“W" =x是g-)+rh R V 上游充通大 March 25,2019 6 SHANGHAI JIAO TONG UNIVERSITYMarch 25, 2019 6 Heat transfer of a polytropic process for ideal gas         2 1 2 1 2 1 2 1 1 1 1 1 v v R R n T T c T T n n R c T T T T n                       Energy balance (1st law): (ideal gas, n≠1) q u w    n c 0 p v n c c    1 T n c   0 s n k c   v n c   (ideal gas, n=1)     2 2 1 1 2 2 1 1 ln ln 1 v T T v c T T RT v R v RT  v        !! No m, V v Because “w” instead of “W