Continue Rankine Cycle Performance Trends Effect of condensation temperature,Tc,on performance: Assume:TR 172.3C and x=0.95 Tc(C) Pc(bar) T3 (C) 7 93.31 0.8 552 0.289 65.61 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 T! Need superheat to get x4>0.9 Would rather increase Th than T3 上游充通大 May9,2019 8 SHANGHAI JLAO TONG UNIVERSITYMay 9, 2019 8 Continue Rankine Cycle Performance Trends Effect of condensation temperature, TC , on performance: • Assume: TB = 172.3oC and x4 = 0.95 TC ( oC) pC (bar) T3 ( oC) h 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 • Tc is limited by sink temperature Summary: • Want high Tb and low Tc ! • Need superheat to get x4 > 0.9 • Would rather increase Tb than T3