Heat transfer of a polytropic process for ideal gas n=0 Energy balance (1st law): n=1 Cr→0 (ideal gas,n≠1) n=k C→0 -区-0+-W n=±oo C -T) n-l q=△u+w !No m,V→v (ideal gas,n=1) =c (T-T)+RTIn Because“w" V instead of“W" k-g-T)+R7n兰 R 1 上游充通大 Mar/15,Wed,2017 6 SHANGHAI JLAO TONG UNIVERSITYMar/15, Wed, 2017 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    n c    1 T n k c  s 0 n c   v (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