A one-shell pass and six-tube passes heat exchanger in a factory is used to decrease the temperature of Hot Oil(Cp=1900 J/kg. oC , Temp=200 oC flowing through tube with the help of water(Cp=4195 J/kg. oC) from nearbylake. Water initially at 16 oC leaves the heat exchanger at 90 oC by flowing at the rate of 0.3 kg/sec. Thevalues of the Ui and Uo should be 2200 W/m2 oC and 1500 W/m2 oC, respectively.

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?