Heat and mass transfer of evaporative cooler with elliptic tube heat exchangers- an experimental study

Liang Han Chien, De Cian Chen, Yu Jie Liu, Wei Mon Yan*, Mohammad Ghalambaz*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

11 Scopus citations

Abstract

In the present study, an evaporative cooling test system consisting of an elliptical-heat exchanger was examined. Tests were conducted for various airflow rates of 52, 68, 81, 96 Cubic Meter per Minute (CMM), sprinkler water flow rates of 30, 40, 50 Liter per Minute (LPM), and hot water flow rates of 18, 22, 28 LPM. The sprinkle nozzle types and outside wet-bulb temperatures were also investigated. The convective heat transfer of the sprinkle water film outside the tubes and the mass transfer between air and water film on tube bundles were probed. The film thickness and sprinkle water picture were studied using high-speed cameras and image processing techniques. The results show that the mass transfer performance of the evaporative cooler was enhanced with the growth of the airflow rate. When the sprinkler water flow rate rose to 50 LPM, the heat-mass transfer coefficient of the evaporative cooler decreased since the water film on the tube was thickened. The low hot water flow rate at the tube side (18 LPM) resulted in a superior performance due to a high local temperature and improved local mass transfer. The experimental data were used to obtain empirical correlations for the heat coefficient of the liquid film and mass transfer.

Original languageEnglish
Article number105502
JournalInternational Communications in Heat and Mass Transfer
Volume127
DOIs
StatePublished - 10 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2021 Elsevier Ltd

Keywords

  • Closed-loop cooling system
  • Elliptic tube heat exchanger
  • Heat and mass transfer
  • Water sprinkler

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