Simple team power plant (Fig.8.1) 1 2 Boiler W,(turbine） turbine Ws(pump) condenser 3 4 ↓o thermal efficiency 2 n= Ta 3
Simple team power plant (Fig. 8.1) 1 4 T S 3 2 T C T H Boiler condenser t u r bin e QH & (turbine) WS & QC & (pump) WS & 3 1 4 2 thermal efficiency 1 C H H W T Q T η = =−
8.1.1 Rankine Cycle The reason for introducing the Rankine Cycle (1)湿蒸汽对汽轮机有侵蚀作用； (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
8.1.1 Rankine Cycle 8.1.1 Rankine Cycle The reason for introducing the Rankine Cycle ? The reason for introducing the Rankine Cycle ? （ 1）湿蒸汽对汽轮机有侵蚀作用； （ 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
The Rankine Cycle T 2 Boiler W、(turbine) turbine Ws(pump) condenser 4 3 ↓Q The four steps(see P286) In boiler 定压升温→沸点 定温定压汽化→饱和蒸汽定压升温→过热蒸汽
The Rankine Cycle The Rankine Cycle Boiler condenser turbine QH & (turbine) WS & QC & (pump) WS & 3 1 4 2 T S 1 4 3 2 The four steps (see P286) The four steps (see P286) In boiler In boiler ⎯定压升温 ⎯ →⎯⎯ 沸点 ⎯定温定压汽化 ⎯ →⎯⎯⎯ 饱和蒸汽 ⎯定压升温 ⎯ →⎯⎯ 过热蒸汽
The differences between The Rankine Cycle and The Carnot Cycle 2 3 Two major respects (see P286)
The differences between The Rankine Cycle and The Carnot Cycle The differences between The Rankine Cycle and The Carnot Cycle T S 1 4 3 2 1 4 T S 3 2 T C T H Two major respects (see P286) Two major respects (see P286)