085

'Hnet

Net heat rate 2,994

(hc - hd) „ , 145.4 Btu/lbm , , Power output = m - = 20,000 Ibm/h - = 1,143 hp

Net thermal output to process = m (hd - ha)^ai = 20,000 Ibm/h (1,056.3 - 180.0) Btu/lbm = 17,526MBtu/h

B. Actual Conditions

Actual heat drop = (hc - hd)actual = VT(hc - hd)ideal = 0.5(1,201.7- 1,056.3) = 72.7 Btu/lbm

Actual hd = hc - rjT (hc— = 1,129 Btu/lbm x 100% = 7.04%

Fig. 11-47 Back-Pressure Turbine Operation.

2,545 Btu/hp-h 2,545 Btu/hp-h . AWR = _-_-_ = _-_ = 35.0 lbm/hp-h

Net heat rate = AWR Vnet

Power output = mT]t

72.7 Btu/lbm

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