Castor oil is subjected to a pressure of 550 kPa at A and to a pressure of 200 kPa at B. If the pipe has a diameter of 30 mm, determine the shear stress acting on the wall of the pipe, and the maximum velocity of the oil. Also, what is the flow Q

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.