Answer Happy

An 8 TR dense air refrigeration system works between pressure
limits of 2 bar and 6 bar. Temperature of
air at inlet to compressor is – 15C and at inlet to expander 30C.
The compression takes place by the law
PV1.35 = Constant and the expansion may be assumed to be
isentropic. Determine: a) Cyclic temperatures.
b) Theoretical (indicated) compressor work. c) Theoretical
(indicated) expander work. d) Net theoretical
work. e) Theoretical cooling effect. f) Theoretical COP. g) Net
work assuming compressor and expander
mechanical efficiency 90%. h) Actual COP. i) Mass flow rate of air.
j) Theoretical piston displacement of
compressor. k) Actual piston displacement of compressor assuming
volumetric efficiency 90%. l)
Theoretical piston displacement of expander. m) Actual piston
displacement of expander assuming
volumetric efficiency 95%. n) Size of double acting compressor
running at 500 rpm and stroke to bore ratio
1.2. o) Size of double acting expander running at 500 rpm and
stroke length to be same as that of the
compressor.