Problem 6.9 - Adiabatic Efficiency of a
High Pressure R134a Compressor
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.