Using the Tds equations A pure,simple compressible system undergoing an internally reversible process Neglecting△PE,△KE 7=pdv Energy balance: (82)int= rev dU+(δw rev s=(9 int Tds D 1st Tds equation: Tds dU pdv 上游究通大学 Wednesday,April 12,2017 8 SHANGHAI JLAO TONG UNIVERSITYWednesday, April 12, 2017 8 Using the Tds equations A pure, simple compressible system undergoing an internally reversible process Neglecting ∆PE, ∆KE Energy balance: 1 st Tds equation: