Chapter 6, Problem 6.30P

Interpretation Introduction

Interpretation:

If in a rigid vessel of given volume, saturated steam is filled at $\text{1500}\text{kPa}$, and this vessel is cooled until $\text{25\%}$ of steam has condensed. Find out amount of heat transferred and the final pressure.

Concept Introduction:

During the heat transferred in the process, total mass and volume remains constant. So, the total volume after the heat transferred is same as total volume at $\text{1500}\text{kPa}$ . So, find the total volume and mass at $\text{1500}\text{kPa}$ using the saturated steam table and use them to find pressure after the heat transferred.

The heat transferred in the process is defined as:

$Q=m(U_2-U_1)$

                    .... (a)

Where $m$ is the mass of steam, $U_2$ is the internal energy after heat transferred and $U_1$ is the internal energy before heat transferred.