الفهرس | Only 14 pages are availabe for public view |
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 |