Question

A vessel of volume 0.03m3 contains dry saturated steam at 17 bar. Determine the mass of the steam in the vessel and the enthalpy of this mass.

Answer 1

Using pressure-enthalpy chart, we find that for these conditions,

The specific volume is $v_g=0.11667 \text{ m}^3\text{/kg}.$

The specific enthalpy: $h_g=2794.5\text{ kJ/kg}.$

Thus, mass of the steam is

$$M=\frac{V}{v_g}=\frac{0.03}{0.11667}=0.257\text{ kg}.$$

The enthalpy for such mass of gas is

$$H_g=Mh_g=719\text{ kJ/kg}.$$