Consider a hypothetical material that has a grain diameter of 6.3 ´ 10-2 mm. after a heat treatment at 500°c for 4 h, the grain diameter has increased to 1.10 ´ 10-1 mm. compute the grain diameter when a specimen of this same original material (i. e., d0 = 6.3 ´ 10-2 mm) is heated for 5.5 h at 500°c. assume the n grain diameter exponent has a value of 2.0

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.