Question

Given below is an extract from steam tables.

Temperature (°C)	Psat (bar)	Specific volume (m3 / kg)		Enthalpy (kJ/Kg)
		Saturated liquid	Saturated vapour	Saturated liquid	Saturated vapour
45	0.09593	0.001010	15.26	188.45	2394.8
342.24	150	0.001658	0.010337	1610.5	2610.5

Specific enthalpy of water in kJ/kg at 150 bar and 45 °C is

1. 203.60
2. 200.53
3. 196.38
4. 188.45

Answer 1

Correct Answer - Option 4 : 188.45

When the temperature of a liquid is less than the saturation temperature at given pressure, the liquid is called compressed liquid. The pressure & temperature of compressed liquid may vary independently. The properties of liquid vary little with pressure. Hence the properties are taken from the saturation table at the temperature of compressed table.