الفهرس 
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Abstract
ABSTRACT
The aim of this work is to optimize the parameters that affecting the
performance of the evaporative cooling system, these parameters which
employed to improve inside greenhouse environment such as thickness of
pads and air velocities, and different pad height values, to judge on
performance of pad evaporative cooling systems many indicators which
employed such as inside air temperature, inside air relative humidity,
cooling effect, cooling efficiency, and cooling capacity. Also, a
mathematical model of heat and mass balance of the evaporative cooling
pads was developed to predict the most important factors affecting the
performance of the system. The obtained results indicated that the hourly
temperature of air increased gradually until it reached the peak at 12.00
PM and then decreased during period from 9 AM to 6 PM. Also, the air
temperature decreases with increasing pad thickness. The hourly relative
humidity of air decreased gradually until it reached the peak at 12.00 PM
and then increased during period from 9 AM to 6 PM. The cooling effect
increased from 4.0 to 5.9, 6.4 to 8.4, 6.8 to 9.6 and 9.2 to 11.6 °C when
the pad thickness increased from 10 to 20 cm, respectively for different
air velocities. The highest value of cooling effect was 11.6 °C when used
20 cm pad thick and 6.0 cm s-1air velocity. In addition to the cooling effect
increased from 4.0 to 10.8, 6.4 to 17.1, 6.8 to 16.5 and 9.2 to 18.4 °C when
the pad height increased from 1.0 to 2.0 m, respectively for different air
velocities. The highest value of cooling effect was 18.4 °C when
functional 2.0 m