solution to no. 11 (plant design assignment)
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A condenser needs to condense 2000 kg/h of vapor at 132°C, with a heat of condensation of 350,000 J/kg. Cooling water is available at 15°C, with a cost of $25/1000m3. To optimize costs over the condenser's 10 year life, the required cooling water flow rate and exit temperature must be determined, given the optimum heat transfer coefficient of 300 W/m2K and equipment cost of $400/m2.
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solution to no. 11 (plant design assignment)
- 1. 1. A condenser for a distillation unit must be designed to condense 2000 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. The heat capacity of water is 4184 J/kgK. If the condenser is to operate 7200 hrs/yr, determine the cooling water flow rate in kg/hr and exit temperature for optimum economic conditions.