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    IMPROVING AIR-CONDITIONING SYSTEMS NUMERICALLY BY USING DIRECT EVAPORATIVE COOLING IN SEVERELY HOT WEATHER
    (2023-10) Saleem, Jaafar Hattab Furaig
    Direct evaporative cooling (DEC) systems use water evaporation to cool air through a moist pad or filter. These systems are known for their low energy consumption. This study aims to improve the operation of DEC systems in extremely hot conditions. The goal is to develop cost-effective and environmentally friendly cooling solutions while reducing energy use, ensuring the systems are correctly constructed and sized for the specific building and climatic conditions. It employs ANSYS software, a robust computational fluid dynamics (CFD) technique, and EES software for simulation. The simulation process will be divided into two phases, the first of which is represented by the presence of injectors, which have been divided into three sections to see the softness in the process of chilling the air entering from outside, which is represented by three distinct speeds. The number of turns of the second section, represented by a tube coming from the condenser in the heat exchanger, will be altered to see the improvement in receiving the cooling gas. Thus, the total number of instances employed is 27 cases added to the two sections, representing 54 cases, followed by the application of these cases with the EES software to determine the value of improvement in the COP. The number of twists in the cooling tubes and the number of nozzles were purposely adjusted to investigate how they affected system efficiency. The system's structure is made up of a coil and tube type heat exchanger with a changeable length and number of turns. The second part of the simulation process is represented by the air entry area and the water spraying process with variable number of nozzles, where 5, 9, and 13 turns of the cooling tube were used, and this represents the second part of the simulation process to know the thermal effect on the heat exchange process between the fluids, while the first part is represented by the air entry area and the water spraying process with variable number of nozzles, where 15, 24, and 35 nozzles were used. The duct's measurements were 20 cm in width, 10 cm in height, and 25 cm in total length. On the duct width, the roll diameter was 60 mm. The results reveal that system geometry, specifically the air entrance region and the water spraying procedure, has a considerable influence on thermal dynamics and fluid flow within a heat exchanger. The number of coils turns and nozzles can have a significant impact on system performance, as illustrated by the distinct temperature and velocity curves. Furthermore, to handle complicated geometrical configurations and deliver significant insights, the study made full use of ANSYS' powerful simulation capabilities. At an inlet velocity of 2.0, the design with 35 injectors and 13 coil turns scored the maximum COP of 4.537, suggesting that it is the best configuration for the given system. It reaches a maximum temperature of 55.27 degrees Celsius. At a velocity of 1 m/s, the coil turns in the temperature chart reach a peak, whereas the COP chart has the lowest values at the same velocity. Also, the highest COP for the system is 4.537, which occurs at 35 injectors and 13 coil turns. The study's findings could open the way for further improvement of such systems, perhaps increasing their efficiency. The study highlights the significance of computational tools in understanding and improving complicated thermal systems such as heat. ?