Mechanics & Industry
Volume 18, Number 4, 2017
|Number of page(s)||8|
|Published online||14 August 2017|
Performance analysis of a two-stage evaporative cooler
Department of Mechanical Engineering, Bam Higher Education Complex,
P.O. Box 76615-314,
* e-mail: email@example.com
Accepted: 16 March 2017
In the present study, a mathematical model of a two-stage evaporative cooling (TSEC) system is presented, which consisted of two direct evaporative coolers and a heat exchanger. In this system, the temperature of the inlet air into evaporative pads decreases through indirect heat exchange with the outlet air stream from the conditioned space, using an unmixed heat exchanger. The outlet air from the conditioned space is also cooled down, prior to cooling the inlet air, through a second evaporation process. The governing equations of the energy and mass are presented and solved simultaneously. The numerical results are then compared with the experimental data reported in the literature to establish confidence in the model. The sensitivity of the performance of the system to the temperature and humidity of the ambient air, efficiency of the direct evaporative pads and overall heat transfer coefficient of the heat exchanger were calculated. The results are discussed to find the parameters with more significant effects on the performance of the system. The sensitivity analysis reveals that further improvements to the performance of the system is possible through increasing of the overall heat transfer within the indirect heat exchanger and increasing of the direct evaporative cooling efficiency.
Key words: evaporative cooling / air conditioning / air humidity / energy saving
© AFM, EDP Sciences 2017
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