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Journal of Enhanced Heat Transfer
Fator do impacto: 1.406 FI de cinco anos: 1.075 SJR: 0.287 SNIP: 0.653 CiteScore™: 1.2

ISSN Imprimir: 1065-5131
ISSN On-line: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2012001683
pages 95-105

ENHANCED EVAPORATIVE FLUID COOLERS

Mohammad Reza Jafari Nasr
Research Institute of Petroleum Industry (RIPI), P. O. Box 14665-137, West Boulevard of Azadi Sport Complex, Tehran, Iran
R. Behfar
Mechanical and Energy Engineering Department, K. N. Toosi University of Technology, Tehran, Iran ; Pouya Energy Espadana Co., Isfahan, Iran

RESUMO

A novel design algorithm is developed for application of enhanced heat transfer technology in evaporative fluid coolers (EFCs). In spite of substantial increase in heat transfer rate, application of these devices can lead to a non-negligible pressure drop, so it is necessary to consider pressure drops in design algorithm directly. In this paper, first the plain tube bundle for EFCs is examined by a new design algorithm and then the thermal appraisal of enhanced bundles is mainly targeted. In this study, application of a typical tube insert in EFCs was investigated. It is determined that by considering the maximum allowable pressure drops, maximum heat and mass transfer coefficients and the minimum required area can be obtained in a straightforward manner. The algorithm is easily adaptable when the other various types of heat transfer enhancement devices are applied inside or even outside of the tube bundle of EFCs. The results are revealed that, depending on the enhancement device, while the heat transfer area required for a given duty is reduced the heat transfer and mass transfer coefficients can be increased significantly.

Referências

  1. Ali Hasan, Ala , Performance analysis of heat transfer processes from wet and dry surfaces: Cooling towers and heat exchangers.

  2. Jafari Nasr, M. R. and Alaei, S. H. , A new algorithm for design, simulation, and optimization of enhanced air coolers.

  3. Kroger, D. G. , Air-Cooled Heat Exchangers and Cooling Towers.

  4. Mizushina, T., Ito, R., and Miyashita, H. , Experimental study of an evaporative cooler.

  5. Mizushina, T., Ito, R., Miyashita, H. , Characteristics and methods of thermal design of evaporative cooler.

  6. Nitsu, Y., Naito, K., and Anzai, T. , Studies on characteristics and design procedure of evaporative coolers.

  7. Polley, G. T., Panjeh Shahi, M. H., and Picon Nunez, M. , Rapid design algorithms for shell-and-tube and compact heat exchangers.

  8. Shenoy, Uday V. , Heat Exchanger Network Synthesis.

  9. Webb, R. L., Kim, N. H. , Principles of Enhanced Heat Transfer.


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