Verification of Pre-Cooling Effects on Saturation ‎Effectiveness of Evaporative Coolers

A hybrid cooling system encompassing; cooling tower، cooling coil and evaporative cooler have been discussed in present study. Thereinafter، the hybrid system model is used to predict cooling potential of the system under various operational conditions. In order to have an accurate performance prediction of the hybrid cooling system، a numerical simulation was performed and the results validated using experimental measurements. The presented hybrid cooling system provides the necessary pre-cooling effects، enabling a direct evaporative cooler that cools the air even below outdoor air wet-bulb temperature. Besides، the potential of presented hybrid cooling system to provide thermal comfort in various outdoor design conditions evaluated and compared with conventional direct evaporative cooler. Numerical simulation revealed that the hybrid system complements direct evaporative cooling. Based on the simulation results، the overall cooling effectiveness of hybrid system is tangibly magnified 10%-20% and also it is able to fulfill the comfort condition in extended climate conditions rather than stand-alone direct evaporative coolers. Also in present study water loss amount of hybrid system and direct evaporative cooler were verified in various climate conditions of Iran.