Continue Rankine Cycle Performance Trends Effect of condensation temperature,Tc,on performance: ·Assume:TB=172.3℃andx4=0.95 Tc(C) Pc(bar) T3(C) n 93.3 0.8 552 0.289 65.6 0.255 604 0.324 37.8 0.066 670 0.359 Notes: T3 must increase to maintain x4 T.is limited by sink temperature Summary: Want high T and low Te! Need superheat to get x4>0.9 Would rather increase Tp than T3 上游充通大率 May9,2018 8 HANGHAI HAO TONG LINIVERSITYMay 9, 2018 8 Continue Rankine Cycle Performance Trends Effect of condensation temperature, TC, on performance: • Assume: TB = 172.3 oC and x 4 = 0.95 TC ( oC) p C (bar) T3 ( oC)  93.3 0.8 552 0.289 65.6 0.255 604 0.324 37.8 0.066 670 0.359 Notes: • T3 must increase to maintain x 4 • Tc is limited by sink temperature Summary: • Want high Tb and low Tc! • Need superheat to get x 4 > 0.9 • Would rather increase Tb than T3