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# exam2 - NAME 10.302 Fall 2004 Exam 2 Wednesday 1(60 points...

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NAME: ____________________ 10.302 Fall 2004 Exam 2 Wednesday, November 10, 2004 1. (60 points) The product obtained from the bottom of a distillation column needs, for safety reasons, to be cooled before it is sent to storage. It is proposed that this be achieved by cooling with air in a crossflow exchanger (both fluids unmixed). The general situation is shown in Figure A. A. If the exchanger is infinitely large and if it were counter current (rather than crossflow), what is the minimum mass flow rate of air that would suffice to cool the 10 kg/s of product from 300 ° C to 50 ° C? You may take the air temperature to be 20 ° C. B. If the actual air flow rate exceeds the minimum found in Part A by 10%, but the exchanger configuration is crossflow, will operation be possible in an exchanger of reasonable size? C. The plan is to use tubes for which the OD is 1.0 inch and the ID is 0.8 inch. The tube length will be 10 ft. The material is carbon steel. The average linear velocity of the product within the tubes will be 1 m/s. That of the air outside the tube will be 4 m/s. The situation is sketched in

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