Approaches to energy efficiency in air conditioning: A comparative study on purge configurations for indirect evaporative cooling
S.J. Oh, M.W. Shahzad, M. Burhan, W. Chun, C.K. Jon, M. Kumja, K.C. Ng
Energy, volume 168, pp. 505-515, (2019)
Indirect evaporative cooler, Dew-point evaporative cooler, Cooling capacity, Purge configuration, Numerical simulation
This paper presents a mathematical model to enable a more in-depth understanding of the combined heat and mass transfer processes of a counter-flow indirect evaporative cooler operating in semi-arid regions. A series of simulation was conducted to compare the performances between a single-purge and four-purge configurations. Furthermore, the effect of several parameters on the performance of the single-purge configuration was investigated under the baseline condition. The developed model was validated against experimental data from literature to within 2% discrepancy. Key results revealed that the single-purge configuration produced higher cooling capacity (around 20% higher), as well as higher dew-point effectiveness under the same operating conditions. A parametric study was also made on the single-purge configuration. The results revealed that lower product air temperature and higher dew-point effectiveness were achieved with longer channel length and larger purge ratio. However, the maximum cooling capacity approached its maximum with longer channel length and 35% purge ratio.
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