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Título del libro: Heat Exchangers: Types, Design, And Applications
Título del capítulo: Thermal design methodology of industrial compact heat recovery with helically segmented finned tubes

Autores UNAM:
ELISEO MARTINEZ ESPINOSA; WILLIAM VICENTE Y RODRIGUEZ; MARTIN SALINAS VAZQUEZ;
Autores externos:

Idioma:
Inglés
Año de publicación:
2011
Palabras clave:

Compact heat exchangers; Heat transfer coefficient; Helical fins; Pressure drop; Segmented fins


Resumen:

A thermal design methodology of compact heat recovery with helically segmentedfinned tubes in staggered layout on an industrial scale is proposed. The methodologyis based in thermodynamic analyses and semi-empirical models for heat transferand pressure drop, coupled to the Logarithmic Mean Temperature Difference (LMTD)method. Some of the best models available in the open literature for heat transferand pressure drop in helically segmented finned tubes are used. The methodologyis validated with experimental data of industrial equipment under different operatingconditions. Comparisons between predictions and experimental data show a precisiongreater than 95% in the heat transfer for Reynolds number, based on outside diameterof bare tube, of about 10000 (Reynolds number based on volume-equivalent diameterof 13751). In the case of pressure drop of gas phase, there is a precision of approximately90% for a Reynolds number based on outside diameter of bare tube, of about10000 (Reynolds number based on volume-equivalent diameter of 13751). Therefore,the results show that the best flow regime in which heat transfer and pressure drop areoptimal is for Reynolds number based on outside diameter bare tube, of about 10000(Reynolds number based on volume-equivalent diameter of 13751) with a length-widthratio (cross section area) around 2.5. © 2011 Nova Science Publishers, Inc. All rights reserved.


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