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Soln_Fall2008_HW8

# Soln_Fall2008_HW8 - SOLUTIONS HW8 1 State3 T3 = 180 Table...

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SOLUTIONS –HW8 1. State3: T3 = 180 Table B1.1, P3=Pg=1002.2 kPa, s3=sg=6.5857kJ/kg Table B.1.2, s4=s3=6.5857=sf+x4*sfg = 0.7548+x4*7.2536 0.8039 h4 = hf+x4*hfg = 225.91+0.8039*2373.14=2134 kJ/kg 2778-2134 = 644 kJ/kg 0.001014*(1002.2-15) = 1.001 kJ/kg 225.91+1.001 = 226.9 kJ/kg 2778-226.9 = 2551 kJ/kg 644-1.001 = 643 kJ/kg 643/2551 = 25.2% 2. a) Table B.2.1 800*41.69 = 33352 kw

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800*0.387 = 310 kw. b) (h2-hf) = 800*(1418.6-227.08) = 9.5322e5 kw (Table B.2.1) /[hf(water 7deg) – hf(water 5deg)] = 9.5322e5/( ) = 1.1348e5 kg/s 227.8+310/1.1348e5 = 227.8 kJ/kg (h1-h4) = 800*(1460.29-227.8) = 985992 kw /[hf(water 25deg) – hf(water 23deg)] = 985992/ = 1.178e5 kg/s c) = ( - )/ = (33352-310)/ 985992 = 3.35% 3.
1. 40 x=0, h1=167.54 kJ/kg, v1=0.001008 m3/kg, P1 = 7.384 kPa 3. 3Mpa, 450 h3 = 3344 kJ/kg, s3 = 7.0833 kJ/kg-K, v3 = 0.13243 m3/kg 6. 40 x=1, h6=2574.26 kJ/kg, s6=8.2569 kJ/kg 0.001008*(3000-7.384) = 3.02 kJ/kg 167.54+3.02 = 170.56 kJ/kg h4 = 3344 kJ/kg 8.2569 kJ/kg-K 600Kpa, 4523.22 kJ/kg, T5 =

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Soln_Fall2008_HW8 - SOLUTIONS HW8 1 State3 T3 = 180 Table...

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