HW-13_solutions-key[1]

HW-13_solutions-key[1] - LM 13 Heat Exchangers Homework...

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LM 13 – Heat Exchangers Homework Assignment 1. McCabe 15.1 – (Worth 2 Points) Air is blown at a rate of 3 m 3 /s (measured at 0 C and 1 atm) at right angles to a tube bank 10 pipes and 10 spaces wide and 10 rows deep. The length of each pipe is 3.5 m. The tubes are on triangular centers, and the center-to-center distance is 75mm. It is desired to heat the air from 20 to 40C at atmospheric pressure. What steam pressure must be used? The pipes are 25 mm OD steel pipe.
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2. (Worth 4 Points) A process has four streams with equal mass flow rates and the characteristics given below. Devise a heat-exchange network to minimize the amount of the utility streams, water and steam, that must be used to accomplish the desired change in energy state of the four streams. You can use as many heat exchangers as you need to. Consider using cross-exchangers in your design. I encourage you to use ChemCad to do this problem. Process Stream Inlet Temp. o C Desired Outlet Temp. o C A – ethanol 60 160 B – 80% ethanol, 20% isopropanol 160 93
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