100 cubic meters of carbon dioxide initially at 150 C and 50bar is to be isothermally compressed in a frictionless piston and cylinder device to a final pressure of 300 bar. Calculate:

i. The volume of the compressed gas
ii. The work done to compress the gas
iii. The heat flow on compression assuming carbon dioxide:

a/ Is an ideal gas
b/ Obeys the principle of corresponding states
c/ Obeys the Peng-RObinson equation of state

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.