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- 1. www.aew.kr () .2. .1. - 1: P1=5.0 kPa, v1f=0.00101 m3/kg h1f=137.606 kJ/kg, h1g=2561.5 kJ/kg - 2: h2=h1+v1(P2-P1)=137.606+0.00101(1600-5.0) = 139.2 kJ/kg - 3: P3=1.6 MPa, T3=201.4 () h3=2794.0 kJ/kg s3=6.4218 kJ/kgK - 4 ( ) P4=5.0 kPa, s4=s1f+x4(s1fg) ( 25%) h4=h4f+x4(h4fg)=137.606+0.751(2561.5-137.606) =1957.95 -------------------------------------------- Wcomp = h2-h1 = 139.2-137.6 = 1.61 kJ/kg Qin = h3-h2 = 2794.0-139.2 = 2654.8 kJ/kg Wexp = h3-h4 = 2794.0-1957.95 = 836.05 kJ/kg Wnet = Wexp-Wcomp = 836.05-1.61 = 834.44 kJ/kg = Wnet/Qin = 834.44/2654.8 = 0.314 (31.4%) ---------------------------------------------- (MPa) () (%) (h4) (kJ/kg) Wexp=h3-h4 (kJ/kg) (kJ/kg.K) 0.005 32.9 10 2319.1 474.9 7.60 0.005 32.9 20 2076.7 717.3 6.810.005 32.9 24.9 1958.0 836.0 6.42 0.005 32.9 30 1834.3 959.7 6.020.005 32.9 50 1349.5 1444.5 4.440.005 32.9 70 864.8 1929.2 2.850.005 32.9 90 380.0 2414.0 1.270.005 32.9 100 137.6 2656.4 0.48(kJ) - (%)473.3 17.8715.7 27.0834.4 31.4958.1 36.11442.9 54.31927.6 72.62412.4 90.92654.8 1002. - 1: P1=0.005 MPa 1-a : v1f=0.00101 m3/kg h1-a=137.606 kJ/kg 1-b : + 25% h1-b=2561.5+0.25 kJ/kg - 2: P2=1.6 MPa 2-a : h2-a=h1+v1(P2-P1)=137.606+0.00101(1600-5.0) = 139.2 kJ/kg 2-b(): + 1/3 1.6 Mpa h2-b=0.75*2561.5+0.25*137.6 = 1957.95 kJ/kg - 3: P3=1.6 MPa, T3=201.4 () h3=2794.0 kJ/kg s3=6.4218 kJ/kgK - 4 ( ) P4=5.0 kPa, s4=s1f+x4(s1fg) ( 25%) h4=h4f+x4(h4fg)=137.606+0.751(2561.5-137.606) =1957.95 (MPa) () (%) (h4) (kJ/kg) Wexp=h3-h4 (kJ/kg) (kJ/kg.K) 0.005 40.3 10 2319.1 474.9 7.60 0.005 40.3 20 2076.7 717.3 6.810.005 40.3 24.9 1958.0 836.0 6.42 0.005 40.3 30 1834.3 959.7 6.020.005 40.3 50 1349.5 1444.5 4.440.005 40.3 70 864.8 1929.2 2.850.005 40.3 90 380.0 2414.0 1.270.005 40.3 100 137.6 2656.4 0.48 (kJ) - Qin (%) -836.0 0 0 -779.3 180.4 180.5 100557.3 887.2 886.7 100334.9 1594.3 1594.2 100112.7 2301.3 2301.3 1001.61 2654.8 2654.8 100