6.3Rankine Vapor CycleQ10TKASASZ店nt元Definition:36003600dh, - h,W.d - the steam required to generate work of 1kW.hd 个=→n,， equipment size 个，investment 个
1 2 1 2 1 2 2 t 1 Q Q T T S S T 1 T = = = − Definition: o 1 2 3600 3600 d w h h = − d — the steam required to generate work of 1kW h , equipment size , investment t d 6.3 Rankine Vapor Cycle
6.3Rankine Vapor CycleInfluencing factors,-hW9nh, -h,q1Pth, - Entralpy of steam, turbine inlet 。·h, - Entralpy of exhaust air , turbine outleth, -Entralpy of condensed waterp
o 1 2 t 1 1 3 w h h q h h − = − Entralpy of steam, turbine inlet Entralpy of exhaust air , turbine outlet Entralpy of condensed water 1 2 3 h h h − − − , p t 1 1 p2 6.3 Rankine Vapor Cycle Influencing factors
6.3Rankine Vapor Cycle1. P,- Pressure of Steam, Turbine InletT4tj, P2 -UnchangeIncreaseinWnetmax5'piPiDecrease5Two Cycles:inWnet13-4-5-1-2-32)3-4-5'-1'-2'-32'2?s
1. p1－ Pressure of Steam, Turbine Inlet 3 4 5 5’ 1’ 1 2’ 2 , 1 2 t p －Unchange 1 p 1' p Two Cycles: ① 3-4-5-1-2-3 ② 3-4-5’-1’-2’-3 6.3 Rankine Vapor Cycle
6.3Rankine Vapor Cycle: T. >T:. p, 个= n, 个Increasein Wnetmax5Disadvantages:DecreaseinWnet1.p, 个> xdecreasetheturbineefficiencyanderodestheturbineblades2'2S2. P, 个Increaseofreguirementsonpressurevesselsandequipmentinvestment
3 4 5 5’ 1’ 1 2’ 2 1 1 ' 1 t T T p Disadvantages: 1. p1 x decrease the turbine efficiency and erodes the turbine blades. 2. p1 Increase of requirements on pressure vessels and equipment investment. 6.3 Rankine Vapor Cycle
6.3Rankine Vapor Cycle2. t, - Temperature of Steam, Turbine InletTIncrease inWnetpi,P2—Unchangeti → tr5Two Cycles:1)3-4-5-6-1-2-32)3-4-5-6-1-2-3322S
2. 1 － Temperature of Steam, Turbine Inlet t 3 4 5 1 1’ 2 2’ 6 , 1 2 p p －Unchange 1 t 1' t Two Cycles: ① 3-4-5-6-1-2-3 ② 3-4-5-6-1’-2’-3 6.3 Rankine Vapor Cycle