Assessment of cooling tower discharge recirculation and dispersion using cfd techniques

S. Pal, L. J. Peltier, A. Rizhakov, Michael P. Kinzel, M. H. Elbert, Kelly J. Knight, S. Rao

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The performance of cooling towers, whether operating by themselves, or in close vicinity of other cooling towers can be adversely affected by the re-ingestion of the cooling tower discharge into the tower intakes. The recirculation of the discharge from a wet cooling tower raises the wet bulb temperature of the air entering a wet cooling tower. Current design strategies, often account for this discharge re-ingestion issue, through a conservative adjustment to the far field ambient wet bulb temperature to calculate the actual intake wet bulb temperature. Critical applications, such as those related to nuclear safety applications where there is concern about cooling tower performance, may require more accurate and comprehensive assessment of the recirculation and dispersion of cooling tower discharge. Gaussian plume models alone are of limited use when dealing with discharges in the vicinity of large structures. This paper discusses the use of a computational fluid dynamics approach to evaluate worst case discharge recirculation effects in cooling towers. The bounding design values of tower intake wet bulb temperature increase due to recirculation (ingestion of tower's own discharge), and interference (ingestion of another interfering tower's discharge), are calculated considering the various conditions of cooling tower operation, ambient temperature, humidity and wind conditions. The RANS CFD model used in the study is evaluated against published experimental data for flow over bluff bodies at high Reynolds numbers, and experimental data on buoyant jets in cross flow.

Original languageEnglish (US)
Title of host publicationASME 2015 Power Conference, POWER 2015, collocated with the ASME 2015 9th International Conference on Energy Sustainability, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791856604
DOIs
StatePublished - Jan 1 2015
EventASME 2015 Power Conference, POWER 2015, collocated with the ASME 2015 9th International Conference on Energy Sustainability, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum - San Diego, United States
Duration: Jun 28 2015Jul 2 2015

Publication series

NameAmerican Society of Mechanical Engineers, Power Division (Publication) POWER
Volume2015-January

Other

OtherASME 2015 Power Conference, POWER 2015, collocated with the ASME 2015 9th International Conference on Energy Sustainability, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum
CountryUnited States
CitySan Diego
Period6/28/157/2/15

Fingerprint

Cooling towers
Towers
Computational fluid dynamics
Temperature
Discharge (fluid mechanics)
Atmospheric humidity
Reynolds number

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Energy Engineering and Power Technology

Cite this

Pal, S., Peltier, L. J., Rizhakov, A., Kinzel, M. P., Elbert, M. H., Knight, K. J., & Rao, S. (2015). Assessment of cooling tower discharge recirculation and dispersion using cfd techniques. In ASME 2015 Power Conference, POWER 2015, collocated with the ASME 2015 9th International Conference on Energy Sustainability, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum (American Society of Mechanical Engineers, Power Division (Publication) POWER; Vol. 2015-January). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/POWER201549033
Pal, S. ; Peltier, L. J. ; Rizhakov, A. ; Kinzel, Michael P. ; Elbert, M. H. ; Knight, Kelly J. ; Rao, S. / Assessment of cooling tower discharge recirculation and dispersion using cfd techniques. ASME 2015 Power Conference, POWER 2015, collocated with the ASME 2015 9th International Conference on Energy Sustainability, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers (ASME), 2015. (American Society of Mechanical Engineers, Power Division (Publication) POWER).
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abstract = "The performance of cooling towers, whether operating by themselves, or in close vicinity of other cooling towers can be adversely affected by the re-ingestion of the cooling tower discharge into the tower intakes. The recirculation of the discharge from a wet cooling tower raises the wet bulb temperature of the air entering a wet cooling tower. Current design strategies, often account for this discharge re-ingestion issue, through a conservative adjustment to the far field ambient wet bulb temperature to calculate the actual intake wet bulb temperature. Critical applications, such as those related to nuclear safety applications where there is concern about cooling tower performance, may require more accurate and comprehensive assessment of the recirculation and dispersion of cooling tower discharge. Gaussian plume models alone are of limited use when dealing with discharges in the vicinity of large structures. This paper discusses the use of a computational fluid dynamics approach to evaluate worst case discharge recirculation effects in cooling towers. The bounding design values of tower intake wet bulb temperature increase due to recirculation (ingestion of tower's own discharge), and interference (ingestion of another interfering tower's discharge), are calculated considering the various conditions of cooling tower operation, ambient temperature, humidity and wind conditions. The RANS CFD model used in the study is evaluated against published experimental data for flow over bluff bodies at high Reynolds numbers, and experimental data on buoyant jets in cross flow.",
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Pal, S, Peltier, LJ, Rizhakov, A, Kinzel, MP, Elbert, MH, Knight, KJ & Rao, S 2015, Assessment of cooling tower discharge recirculation and dispersion using cfd techniques. in ASME 2015 Power Conference, POWER 2015, collocated with the ASME 2015 9th International Conference on Energy Sustainability, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers, Power Division (Publication) POWER, vol. 2015-January, American Society of Mechanical Engineers (ASME), ASME 2015 Power Conference, POWER 2015, collocated with the ASME 2015 9th International Conference on Energy Sustainability, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum, San Diego, United States, 6/28/15. https://doi.org/10.1115/POWER201549033

Assessment of cooling tower discharge recirculation and dispersion using cfd techniques. / Pal, S.; Peltier, L. J.; Rizhakov, A.; Kinzel, Michael P.; Elbert, M. H.; Knight, Kelly J.; Rao, S.

ASME 2015 Power Conference, POWER 2015, collocated with the ASME 2015 9th International Conference on Energy Sustainability, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers (ASME), 2015. (American Society of Mechanical Engineers, Power Division (Publication) POWER; Vol. 2015-January).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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M3 - Conference contribution

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Pal S, Peltier LJ, Rizhakov A, Kinzel MP, Elbert MH, Knight KJ et al. Assessment of cooling tower discharge recirculation and dispersion using cfd techniques. In ASME 2015 Power Conference, POWER 2015, collocated with the ASME 2015 9th International Conference on Energy Sustainability, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers (ASME). 2015. (American Society of Mechanical Engineers, Power Division (Publication) POWER). https://doi.org/10.1115/POWER201549033