(2)绝热压缩过程难以实现： (3)蒸气比体积比液体大上千倍，设备及功耗大： (4)上限温度受制于临界温度，热效率不高。 8.1.2 Rankine cycle The reason for introducing the Rankine Cycle Equipments Boiler Turbine Condenser Pump 00H 7 2 Boiler 序，(turbine) turbi ∥(pump) Condenser 3 Stepsand TSdiagram
（2）绝热压缩过程难以实现； （3）蒸气比体积比液体大上千倍，设备及功耗大； （4）上限温度受制于临界温度，热效率不高。 8.1.2 Rankine cycle The reason for introducing theRankineCycle ? Equipments Boiler Turbine Condenser Pump Steps and TS diagram Boiler Condenser turbi ne QH (turbine) WS QC (pump) WS 3 1 4 2
Step 1-2:A constant-pressure heatingprocess ina boiler Step 2-3:Reversible adiabaticexpansionofvapor inaturbine Step 3-4:A constant-pressure,constant-temperature process in a condenser Step 4-1:Reversible adiabatic pumping of the saturated liquid to the pressure ofthe boiler,producing compressed liquid The differences between The Rankine Cycle and The Carnot Cycle Two major respects T TH Te 4 The Carnot Cycle
Step 1-2： A constant-pressure heating process in a boiler Step 2-3： Reversible adiabatic expansion of vapor in a turbine Step 3-4： A constant-pressure, constant-temperature process in a condenser Step 4-1： Reversible adiabatic pumping of the saturated liquid to the pressure of the boiler, producing compressed liquid The differences between The Rankine Cycle and The Carnot Cycle Two major respects The Carnot Cycle T S 1 4 3 2 T S 1 4 3 2 TC TH