Heat leaks from the air in a kitchen through the walls of a refrigerator into the refrigerated cold space at a rate of 0.3 kW. The refrigerator operates in an ideal vapor-compression refrigeration cycle between 1.2 bar and 9 bar. It uses refrigerant R-134a as the working fluid.
i) the mass flow rate of the refrigerant.
ii) the compressor power.
iii) the coefficient of performance of the refrigerator. [15 Marks]