6-6 reversible and irreversible processes 6-7 The Carnot Cycle (卡诺循环) 6-8 The Carnot Principles (卡诺定理) 6-9 the thermodynamic temperature scale 6-10 The Carnot Heat Engine(卡诺热机) 6-11 The Carnot refrigerator and heat pump 6-11 The carnot refrigerator and heat pump