A construction vehicle has a diesel engine with eight cylinders of 5.375 inch bore and 8.0 inch stroke, operating on a four stroke cycle. It delivers 152-shaft horsepower at 1000 RPM. with a mechanical efficiency of 0.60.calculate,

(1) Total engine displacement( in3)

(2) Brake mean effective pressure (psia)

(3) Torque at 1000RPM (lbf-ft)

(4) Indicated horsepower

(5) Friction hosepower

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.