Computation of overall heat transfer coefficients in a triple tube heat exchanger (TTHE) is complicated when compared to a double tube heat exchanger (DTHE) since the two overall heat transfer coefficients are not independent of each other and must be solved for simultaneously. Previous methods established towards calculation of these parameters either include assumptions that are not valid for all flow conditions and fluid flow rates or use empirical correlations which may cause significant deviations from actual values of these parameters. A more generic technique was developed for calculation of overall heat transfer coefficients and axial temperature distribution of fluids in a triple tube heat exchanger. The developed procedure has been used for calculation of these parameters at various fluid flow rates and product inlet temperatures. Theoretical double tube heat exchanger results were also tabulated for comparison purposes. The advantages of using a TTHE over a DTHE has been both conceptually explained and demonstrated using the results obtained. However, it was also shown that design of TTHE experiments is critical, especially in the co-current flow arrangement, since the relative flow rates of the fluids may result in a decrease in the effectiveness. The effect of fluid flow rates, product inlet temperature, and flow arrangement on values of overall heat transfer coefficients, total amount of heat transferred, and effectiveness were also investigated. These results were analyzed using SAS and interpreted for the consistency of the obtained results with the literature.
| Identifer | oai:union.ndltd.org:NCSU/oai:NCSU:etd-11062003-123823 |
| Date | 06 November 2003 |
| Creators | Batmaz, Ediz |
| Contributors | Andrey V. Kuznetsov, Brian E. Farkas, K.P. Sandeep |
| Publisher | NCSU |
| Source Sets | North Carolina State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://www.lib.ncsu.edu/theses/available/etd-11062003-123823/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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