A condenser needs to be designed to condense 2000 kg/h of vapor at 132°C with a heat of condensation of 350000 J/kg. Cooling water is available at 15°C, and the optimum design calls for a heat transfer coefficient of 300 W/m2K. The task is to determine the cooling water flow rate and exit temperature that provides the most economical operation over 10 years.

1. 5Che-B Group 3

2. A condenser for a distillation unit must be designed to condense2000 kg/h of vapor. The effective condensation temperature for the vapor is 132 o C.The heat of condensation for the vapor is 350000 J/kg. Cooling water is available at 15 o C.The cost of cooling water is $25/1000m 3 .The optimum Heat Transfer Coefficient is 300 W/m 2 K.The cost of the installed heat exchanger is $400/m 2 and life of the equipment is 10 years with interest rate of 8%. The heat capacity of water is 4184 J/kgK. Determine the cooling water flow rate in kg/hr and exit temperature for optimum economic conditions.