الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
Nowadays, reduction of energy consumption is a major concern for most hot countries especially in areas with very hot weather conditions where air-conditioning systems equipped with air-cooled condensers (direct expansion system DX) are usually used to cool homes. Under these weather conditions the performance of air-cooled condensers decreases sharply and the unit electrical power consumption increases considerably. These problems have activated research programs in order to enhance the performance of air-cooled condensers by improving the heat transfer rate in the condenser. In this research evaporative cooling (mist cooling) was introduced in the air-cooled condenser air-conditioning system and experimentally investigated. Real air conditioning units are used to test the modification by using a mist system (water atomization) in order to cool down the ambient air before it passes through the condenser coils. To meet the aim of the study, two rooms were constructed with the same materials and size and each room was equipped with the same (size and brand) new mini-split air conditioning unit. The experiment was repeated nine times in different weather conditions. All results show that the thermodynamic characteristics of the modification system are considerably improved. The power consumption decreases in average by approximately 11% and the coefficient of performance increases in average by approximately 13%. The experiment proved that enhancing the heat transfer rate in the condenser, by applying water mist in the air-conditioning system equipped with air cold condenser, enables the coefficient of performance (COP) to increase and the power consumption to decrease.