Water is fed to a boiler at 50°C the enthalpy of vaporization at atmosphere pressure in the boiler 2400KJ/KG steam come out from boiler is 0.7 dry the net heat supplied in the boiler is?
Answers
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The Net heat supplied to the boiler is 1880kJ/kg
Given:
The temperature at the inlet of the boiler(T1) = 50°C, Saturation temperature (Tsat) = 100∘ C, Enthalpy of vaporization (hgf)= 2400 KJ/kg and Dryness Fraction = 0.7
To Find:
The net heat supplied in the boiler
Solution:
Enthalpy of saturated liquid (hf)
= Cp*dT
= 4 x (Tsat - T1)
= 4 x (100 - 50)
= 200 kJ/kg
The total enthalpy of liquid at the exit of the boiler( h)
= hf + xhfg
= 200 + 0.7* 2400
= 1880 KJ/Kg
The Net heat supplied to the boiler is 1880kJ/kg.
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