1 20 points A steam compressor has 0617 kgs of steam enterin

1. (20 points) A steam compressor has 0.617 kgs of steam entering at 3 kPa (0.03 bar) and a quality of 0.9. The steam exits the compressor at 100 kPa (1 bar. The compressor isentropic efficiency is 0.768. Using the Mollier diagram below to answer the questions on the next page Section 4000 -- A 3500 3000 100 2500 2000 65 7.5 85 Entropy S. KK kg! engineeringtoolboxcom

Solution

The Mollier diagram is useful when analyzing the performance of adiabatic steady-flow processes, such as flow in nozzles, diffusers, turbines and compressors.

Dryness Fraction

The quantity of saturated vapor in unit mass of wet vapor, denoted by x, is referred to as the

dryness fraction, or quality,

of the vapor.

Convert to other Units

Example - Enthalpy

The enthalpy in saturated steam (x = 1, the bold red line in the diagram) with pressure 10 bar can be estimated to aprox.

2770 kJ/kg