Single reservoir Two reservoir Power Cycles Interacting with Two Reservoirs Hot reservoir Any substance, And process Boundary ◆Weycle=QH-Qc Cold reservoir Qc=0今n=1→Wycle=QH Thermal efficiency of the cycle: violate the Kelvin-Planck statement Gain n= =1- Cost C CH Must discharge Qc Weycle<QH,n≤100% 上游充通大 Apr/5 Wed,2017 4 SHANGHAI JLAO TONG UNIVERSITYApr/5 Wed, 2017 4 Single reservoir  Two reservoir Power Cycles Interacting with Two Reservoirs Thermal efficiency of the cycle: QC=0  η =1  Wcycle = QH violate the Kelvin–Planck statement • Must discharge QC • Wcycle < QH , η<100% Any substance, And process Gain Cost