Ex9_11 - 378.77302 real w = 303.01841 T9 = 1097.8879 Regenerator T5 = 969.15735 Combustor qh = 432.13518 Overall cycle efficiency eta_th =

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Example 9.11 Cold-air standard calculation and exergy balance Standard units throughout. c_p c_v mdot R k (k-1)/k 1.003 0.716 5.807 0.287 1.400838 0.2861416 T0 p0 T1 p1 p2 T3 p4 T6 p7 eta_s eta_reg 300 100 300 100 300 300 1000 1400 300 0.8 0.8 Lower compressor ideal T2s / T1 = (p2/p1)^(k-1)/k T2s = 410.81423 ws = cp(T2s-T1) ws = 111.14668 real w = ws/eta_s w = 138.93335 T2 = 438.51779 Intercooler qi = cp(T2-T3) qi = 138.93335 Upper compressor ideal T4s /T3 as above T3s = 423.38806 ws = 123.75822 real w = 154.69778 T4 = 454.23507 Skip regenerator/combustor for now: we don't know point 9 Upper turbine ideal T7s / T6 as above T7s = 991.99775 ws = 409.22626 w = 327.381 T7 = 1073.5982 Reheater qr = cp(T8-T7) qr = 327.381 Lower turbine ideal T9s = 1022.3599 ws =
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Unformatted text preview: 378.77302 real w = 303.01841 T9 = 1097.8879 Regenerator T5 = 969.15735 Combustor qh = 432.13518 Overall cycle efficiency: eta_th = 0.4433984 matches the textbook p 439 Now, exergy balance state 0 state 1 state 2 state3 state4 state5 state6 state7 state8 state9 state10 T 300 300 438.51779 300 454.23507 969.15735 1400 1073.5982 1400 1097.8879 582.96564 p 100 100 300 300 1000 1000 1000 300 300 100 100 ef 0 119.29683 94.590518 228.12729 516.56867 838.03266 486.86544 734.37061 409.90564 83.912894 second law efficiencies lower compressor 0.8586624 upper compressor 0.8632107 upper turbine 0.9322653 lower turbine 0.9339018...
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This note was uploaded on 04/02/2012 for the course ECS 222 taught by Professor Staff during the Fall '08 term at Syracuse.

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