**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 [η
_{C}= 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.

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Engineering Thermodynamics by
Israel Urieli is licensed under a
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