Reversibility of the processes Process 1-2&3-4:adiabatically reversible (isentropic) Process 2-3 &4-1:Heat transfer △I vanishingly small→reversible; 个 (2)·(3) TH Energy source at TH B10 OH △T→0 Reservoir TH Tc const.gas Tconst. 上游充通大学 April 9,2019 4 SHANGHAI JLAO TONG UNIVERSITYApril 9, 2019 4 Reversibility of the processes Process 1–2 & 3-4: adiabatically reversible (isentropic) Process 2–3 & 4-1: Heat transfer ∆T vanishingly small  reversible; ∆T 0 Reservoir TH & TC const.  gas T const. QH QC