w,q trend on p-v diagram w=Spdv 9=∫Tds W>0 9>0 n=0 n=0 n=1 n=1 n=k n=k n=oo n=o0 V V 上游充通大 March 23,2018 12 SHANGHAI JIAO TONG UNIVERSITYMarch 23, 2018 12 w, q trend on p-v diagram p v n=0 n=1 n=k n=∞ w>0 p v n=0 n=1 n=k n=∞ q>0 w p v  d  q T s  d 