Studying the performance of an improved dew-point evaporative design for cooling application

X. Cui, K. J. Chua*, W. M. Yang, K. C. Ng, Kyaw Thu, V. T. Nguyen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Scopus citations


The performance of a novel dew-point evaporative air cooler is theoretically investigated in this paper. The novel dew-point evaporative air cooler, based on a counter-flow closed-loop configuration, is able to cool air to temperature below ambient wet bulb temperature and approaching dew-point temperature. A computational model for the cooler has been developed. We validated the model by comparing the temperature distribution and outlet air conditions against experimental data from literature. The model demonstrated close agreement with the experimental findings to within ±7.5%. Employing the validated model, we studied the cooler performance due to the effects of (i) varying channel dimensions; (ii) employing room return air as the working fluid; and (iii) installing of physical ribs along the channel length. Using these means, we have demonstrated improved performance of the dew-point cooler - enabling it to achieve higher efficiencies. Operating under variant inlet air temperature and humidity conditions, simulated results showed that the wet bulb effectiveness ranged from 122% to 132% while dew-point effectiveness spanned 81%-93%.

Original languageEnglish (US)
Pages (from-to)624-633
Number of pages10
JournalApplied Thermal Engineering
Issue number2
StatePublished - Feb 22 2014


  • Heat exchanger
  • Indirect evaporative cooling
  • M-cycle
  • Numerical simulation
  • Physical ribs
  • Room return air

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering


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