A shell-side condenser with cooling tower water on the tube side is not performing satisfactorily, due to tube-side fouling. There is negligible shell-side fouling. Contemplated is replacement of the plain tubes with low finned tubing having 1.18 fins/mm. This will increase the tube outside area by a factor of 2.9 over that of the plain tubes. The following are some design data provided.
Assuming a fin efficiency of 100% in parts (a)-(c):
(a) Determine the overall heat transfer coefficient based on the shell-side surface area for plain and finned-tube exchangers.
(b) Compute the percentage increase in q by employing low-finned tubes. Assume that AT,, remains constant.
(c) Discuss the results of part (b) in relation to the above-specified increase in surface area due to fins.
(d) Discuss qualitatively the results for part (b) if the fin efficiency would have been 90%.
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