(HP-67) Performance Ranking finned tubular heat exchanger

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An extract from Performance Ranking of Finned Tubular Heat Exchanger Surfaces, U.S. Naval Academy (MS ME thesis, MIT), May 1977 (119 pgs.)

ABSTRACT
The traditional method of data presentation for heat exchanger surfaces does not permit comparison of individual surface types in any simple manner. This data is most commonly presented in terms of heat transfer coefficients and friction factors referenced to the exposed area as a function of Reynolds number based on the minimum free flow area.
Soland [5] proposed a method of surface comparison for plate-finned heat exchanger surfaces in which the heat transfer coefficient and friction factor is referenced to the base area and Reynolds number is based on the open flow area, as though the enhanced surfaces were not present.
Theory and principle inherent in the Soland proposal are used to develop a method of surface comparison for finned tube surfaces as presented in (a) Kays and London [2] , and (b) several supplemental surfaces furnished by the Trane Corporation. The derived comparison method is evaluated by application to a practical crossflow finned tubular heat exchanger design.
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APPENDIX I
A. Purpose
A frequent criticism of academic solutions to "optimization" of design is: "So what, . . . how does this help the engineer in industry?" [8]
It is hoped that this section will give the "engineer in industry" the needed background and technique to effectively compare finned tubular heat exchanger surfaces.
A step-by-step flow diagram using the performance comparison equations derived in the text of the thesis is presented in Figure A-l. This procedure is easily programmed
for use on either a (1) standard computer or (2) programmable calculator.
In keeping with the spirit of the criticism of Reference [8] , a program for use on a personal programmable calculator will be presented herein. It is intended that this simplified, easy-to-use approach will demonstrate that the "engineer in industry" needn't resort to often costly computer time/programs in order to effectively "optimize" a design.
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*For Hewlett-Packard 67/97 Programmable Calculator

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