Abstract
An experimental study was carried out for an evaporative cooling system in order to investigate the effect of using an aluminum pad coated with fabric polyester. In the present work, it was considered to use a new different type of cooling medium and test its performance during the change in the wet-bulb temperature and dry-bulb temperature of the supply air outside of the pad, the relative humidity of the supply air, the amount of air supplied (300-600) CFM and also the change of the amount of circulated water (1.75, 2.5, 4.5) liter per minute. A decrease in the WBT of the air was obtained, whereas the WBT of the air entering the pad was 26.5 . In contrast, the WBT of the outside air had reached 23 even though evaporative cooling is an adiabatic process which makes the WBT of the air that comes out of the pad is equal to the entering air WBT. The decrease in DBT is by changing the amount of air and water passing through the aluminum pad, whereas the DBT of the air entering the pad was 45 , while the DBT of the outside air had reached 29 . Also, an essential thing was obtained as this rise in the relative humidity of the air is very small 57%RH compared to the conventional pads, and this gives a positive impression as the air supplied from this pad has less moisture and its ability to carry moisture is much higher than that of air supplied from other pads. This gives a positive impression because the air supplied from this pad has lower humidity and its ability to hold moisture much higher than the air supplied from other traditional pads.
Highlights
In air conditioning, everyone aspires to reduce the operating costs of refrigeration devices and reduce losses resulting from the high temperatures of the climate
It can be applied to cool outdoor air and save a large amount of energy. (Mahsa, et al, 2011) experimentally evaluated the performance of cellulosic pads made out of Kraft and neutral sulfite semi-chemical (NSSC) corrugated papers as evaporative media and comparing their performance with other cellulosic pads
The result clarify that the ECAC had an EER of 47 % higher than that of ACAC under the same and most serve hot and dry condition of 52oC and 10% relative humidity, ECAC operating at EER of 10.5 BTV/W .Performance analysis of a direct evaporative pad cooling system was investigated numerically by (Azzeddine, et al, 2018)
Summary
Everyone aspires to reduce the operating costs of refrigeration devices and reduce losses resulting from the high temperatures of the climate. Everyone aspires to provide an air of good quality and within comfortable conditions for humans On this basis, it was questioned whether another one could replace the traditional pads for evaporative cooling devices with better thermal performance with less water consumption and reduced moisture in the prepared air. A computer program is used to determine the influence of pad thickness and frontal velocity on the system's performance It has been found in the results that the proposed cooling system can reduce the temperature in the hottest period with a performance coefficient higher than 80% and an average water consumption rate of more than 3.3 kg per hour. The coefficient of performance decreases with increasing the thickness and frontal velocity
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