Problem 6.9 - Adiabatic Efficiency of a High Pressure R134a Compressor
Recall Problem 4.12, in which we evaluated a R134a heat pump system using a compressor under the conditions 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 [43.5 kJ/kg].
c) Using R134a refrigerant tables determine the adiabatic efficiency of the compressor [ηC = 78%].
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. ___________________________________________________________________________________________