Solved Problem 6.5 - Adiabatic Efficiency of a R134a Compressor
Consider the R134a refrigerator compressor shown below.
a) Carefully plot the actual and isentropic compression processes on the h-s diagram and indicate the actual and isentropic specific work done to drive the compressor on the plot.
b) Using R134a refrigerant tables determine the specific work required to drive the compressor [53.9 kJ/kg].
c) Using R134a refrigerant tables determine the adiabatic efficiency of the compressor [ηC = 92%].
d) Discuss these results and determine if this is a feasible compressor design.
Derive all equations used starting from the basic energy equation for a flow system and the equation for adiabatic efficiency of a compressor.
Solution Approach:
Discussion: This is a feasible compressor design - the adiabatic efficiency is higher than we expected however within an acceptable range (less than around 95%).
