A refrigerator uses refrigerant Ammonia as the working fluids and operates between evaporating and condensing temperature of -16 degree and 40 degree. The vapor is a dry saturated at the compressor inlet and leaves the condenser at temperature of 34 degree. If the mass flow rate of the refrigerant is 0.05 kg/s,

Asteam is contained in a rigid tank with a volume of 1 m3. initially, the pressure and temperature are 7 bar and 500 oc, respectively. the temperature drops due to cooling process. determine: (1) the temperature at which condensation begins in °c, (2) the fraction of the total mass that has condensed when the pressure decreased to 0.5 bar. (3) the volume in m3 occupied by saturated liquid at the final state?