(a) sketch a typical eutectic phase diagram with components a and b having similar melting points. b is much more soluble in a (maximum = 15%) than a is in b (maximum = 5%), and the eutectic composition occurs near 40% b. the eutectic temperature is 2/3 of the melting point. label the axes of the diagram. label all the phases. use a and b to denote the solid phases (b) for an overall composition of 60% b, list the sequence of phases found as the liquid is slowly cooled to room temperature.

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.