What is the specific volume of superheated steam at 300 °C and a pressure of 1.2 MPa?

The specific volume of the super heated steam is 0.2139 m³/kg.

Explanation:

Super heated steam is the condition where only compressed vapor of water present. This is not containing any liquid form of water. Super heated steam has very high pressure depending upon temperature. If heat supplied increases after saturation vapor condition of the water, the water fuses into steam completely. Properties of super heated steam are taken from the super heated steam table.

Given:

Temperature of superheated steam is 300°C.

Pressure of the super heated steam is 1.2 Mpa.

Calculation:

Step1

Value of specific volume of the super heated steam is taken from superheated steam table at 300°C and 1.2 Mpa as follows:

Specific volume is 0.2139 m³/kg.

Step2

All other properties are also taken from the table as:

Internal energy is 2789.7 kj/kg.

Enthalpy is 3046.3 kj/kg.

Entropy is 7.034 kj/kgK.

The part of table at the temperature 300°C and pressure 1.2 Mpa is shown below:

Thus, the specific volume of the super heated steam is 0.2139 m³/kg.