Estimation of the Water Temperature Influence on Direct Evaporative Cooler Operation

Abstract

In the present paper a study is conducted of the mass and heat transfer phenomena which rule the function of a direct evaporative cooler. A comprehensive mathematical model is developed, which is based on the latent and sensible heat transfer and can predict the effectiveness of such a cooler under any circumstances of operation and water supply. As a development of the existing simulation models of direct evaporative coolers, the model presented here is general, as far as the temperature of the supply water is concerned. In addition, direct evaporative cooling is valued according to its efficiency, the quality of outcoming air and the specific consumption of water while working in Mediterranean climates.

Keywords

• Thermodynamics; Direct evaporative cooling; cooling efficiency; cooling capacity; specific water consumption

References

1. Camargo, J. R., Ebinuma, C. D., Silveira, J. L. (2005). Experimental performance of a direct evaporative cooler operating during summer in a Brazilian city. International Journal of Refrigeration, 28, 1124-1132. Erens, P.J., Dreyer, A.A. (1991). Modelling of indirect evaporative air coolers. International Journal of Heat and Mass Transfer, 36, 17-26.
2. Fouda, A., Melikyan, Z. (2011). A simplified model for analysis of heat and mass transfer in a direct evaporative cooler. Applied Thermal Engineering, 31, 932-936.
3. Finlay, I. C., Harris, D. (1984). Evaporative cooling of tube banks. International Journal of Refrigeration, 7, 2142
4. Kachhwaha, S. S., Prabhakar, S. (2010). Heat and mass transfer study in a direct evaporative cooler, Journal of Scientific & Industrial Research, 69, 705-710.
5. Lazzarin, R. (2007). Introduction of a simple diagram-based method for analyzing evaporative cooling. Applied Thermal Engineering, 27, 2011-2025.
6. Perry’s Chemical Handbook (Vol. 7) (2008). New York: McGraw-Hill Companies, Chapter 2, pp. 60.
7. Wu, J.M., Huang, X., Zhang, H. (2009). Numerical Investigation on the heat and mass transfer in a direct evaporative cooler, Applied Thermal Engineering, 29, 195-20
8. Papaefthimiou, V. D. (2004). Thermodynamic Analysis of Absorption Engines (Ph.D. thesis), National Technical University of Athens, Thermal Engineering Department.