CH ENGR 101B Chapter 11: Problem Sets
9 Jan 2019
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Consider the compact heat exchanger conditions of example 11s. 2. 0. 0005 and 0. 001 m2 k/w are associated with the water- and gas-side conditions, respectively. Consider the heat exchanger core geometry and frontal area prescribed in example 11s. 2. Consider the conditions of example 11s. 2, but with the continuous fin arrangement of figure 11s. 6 used in lieu of the circular fins of figure 11s. 5. The heat exchanger core is fabricated from aluminum, and the tubes have an inside diameter of 8. 2 mm. An inside convection coefficient of 1500 w/m2 k may again be assumed for water flow through the tubes, with combustion gases at 1 atm and 825 k in cross flow over the tubes. Hint: estimate the fin efficiency by assuming a hypothetical circular fin of radius r2 = 15. 8 mm for each tube. You may use the aluminum and fluid properties provided in example 11s. 2.
