الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 214 |  |  |
| | | from | 214 | | |
Abstract
Cooling tower is a type of direct contact heat exchanger, inside of which heat is transferred from water to air. In this research experimental study of the performance of forced draft counter flow cooling tower with and without packing is investigated. The study was conducted for different water inlet temperature varies between 35 C and 55 C with interval 5 C. The mass flow rate of water was taken to be 0.05, 0.058, 0.067, 0.075 and 0.083 kg/s. The mass air flow rate was also changed to be: 0.043, 0.056, 0.067 and 0.073 kg/s. The water injection holes diameter was changed to be 1, 2, 3 and 4 mm. The interval distance between injection holes was 25, 50, 75 and 100 mm. The study was also conducted for different types of packing; namely, Kraft paper, plastic cell and metal wire mesh. The aim of this work is to study the effect of the above parameters on each of: water temperature difference, tower effectiveness, heat rejected, mass transfer and pressure drop.
The results indicate an increase of water temperature difference and cooling tower effectiveness with the increase of water inlet temperature, air flow rate, interval distance between injection holes while it is decreased with the increase of injection holes diameter, water flow rate, water to air flow ratio.
The heat rejected and mass transfer increase with the increase of each of water inlet temperature, air flow rate, water flow rate, water to air flow ratio, interval distance between injection holes and while it is decreased with the increase of injection holes diameter.
The experimental results indicated that, the effectiveness of cooling tower with metal packing is higher than that with plastic cells by 8.6%, with that of Kraft paper by 18.8% and with the case of no packing by 43.2 % respectively. However, the packing metal mesh is highest in pressure DROP of other the types. The performance of the cooling tower at the case of spray cooling is better than the film cooling case by 18.6%.