Simplification of analytical models and incorporation with CFD for the performance predication of closed-wet cooling towers

Ala Hasan (Corresponding Author), Guohui Gan

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)

Abstract

Simplified analytical models are developed for evaluating the thermal performance of closed-wet cooling towers (CWCTs) for use with chilled ceilings in cooling of buildings. Two methods of simplication are used with regard to the temperature of spray water inside the tower. The results obtained from these models for a prototype cooling tower are very close to experimental measurements. The thermal performance of the cooling tower is evaluated under nominal conditions. The results show that the maximum difference in the calculated cooling water heat or air sensible heat between the two simplified methods and a general computational model is less than 3%. The analytical model distribution of the sensible heat along the tower is then incorporated with computational fluid dynamics (CFD) to assess the thermal performance of the tower. It is found that CFD results agree well with the analytical results when the air flow is simulated with air supply from the bottom of the tower, which represents a uniform air flow. CFD shows the importance of the uniform distribution of air and spray water to achieve optimum design.

Original languageEnglish
Pages (from-to)1161-1174
Number of pages14
JournalInternational Journal of Energy Research
Volume26
Issue number13
DOIs
Publication statusPublished - 25 Oct 2002
MoE publication typeA1 Journal article-refereed

Fingerprint

Cooling towers
Analytical models
Computational fluid dynamics
Towers
Air
Ceilings
Cooling water
Hot Temperature
Water
Cooling

Keywords

  • Analytical model
  • CFD
  • Chilled ceilings
  • Cooling tower

Cite this

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title = "Simplification of analytical models and incorporation with CFD for the performance predication of closed-wet cooling towers",
abstract = "Simplified analytical models are developed for evaluating the thermal performance of closed-wet cooling towers (CWCTs) for use with chilled ceilings in cooling of buildings. Two methods of simplication are used with regard to the temperature of spray water inside the tower. The results obtained from these models for a prototype cooling tower are very close to experimental measurements. The thermal performance of the cooling tower is evaluated under nominal conditions. The results show that the maximum difference in the calculated cooling water heat or air sensible heat between the two simplified methods and a general computational model is less than 3{\%}. The analytical model distribution of the sensible heat along the tower is then incorporated with computational fluid dynamics (CFD) to assess the thermal performance of the tower. It is found that CFD results agree well with the analytical results when the air flow is simulated with air supply from the bottom of the tower, which represents a uniform air flow. CFD shows the importance of the uniform distribution of air and spray water to achieve optimum design.",
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Simplification of analytical models and incorporation with CFD for the performance predication of closed-wet cooling towers. / Hasan, Ala (Corresponding Author); Gan, Guohui.

In: International Journal of Energy Research, Vol. 26, No. 13, 25.10.2002, p. 1161-1174.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Hasan, Ala

AU - Gan, Guohui

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