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A steam power plant operates on a regenerative cycle with a single open feedwater heater as shown in the figure. For the state points showwn, the specific enthalpies are $h_{1} = 3000$ $k J / k g$ and $h_{2} = 160 k J / k g$ . The bleed to the feedwater heater is 25% of the boiler steam generation rate. The specific enthalpy at state 3 is _____ kJ/kg

870

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Solution

The correct option is A 870
$h_{3} = m h_{1} + (1 - m) h_{2}$
$= 0.25 \times 3000 + (1 + 0.25) \times 160$
$h_{3} = 870 k J / k g$

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