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A thermal power plant operates on a regenerative cycle with a single open feedwater heater, as shown in the figure. For the state points shown the specific enthalpies are : h1 = 2800 kJ/kg and h2 = 200 kJ/kg. The bleed to the feedwater heater is 20% of the boiler steam generation rate. The specific enthalpy at state 3 is

A thermal power plant operates on a regenerative cycle with a single open feedwater heater, as shown in the figure. For the state points shown the specific enthalpies are : h1 = 2800 kJ/kg and h2 = 200 kJ/kg. The bleed to the feedwater heater is 20% of the boiler steam generation rate. The specific enthalpy at state 3 is Correct Answer 720 kJ/kg

Enthalpy at state 3 = h3

= 0.2h1 + 0.8h2

= (0.2×2800)+(0.8×200)

= 560 + 160 = 720 kJ/kg

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