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Calculate the thermal efficiency of the steam power plant cycle described

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Calculate the thermal efficiency of the steam power plant cycle described

State  1 2 3 4 5 6 7
P psia  900 890 860 830 800 1.5 1.4
T F  115 350 920 900 110
h Btu/lbm - 85.3 323 1468 1456 1029 78
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W NET = 33 000 - 400 = 32 600 hp = 8.3 ×107 Btu/h 

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