DETERMINATION OF THE PERFORMANCE OF LOCAL PAD IN DIRECT EVAPORATIVE COOLING SYSTEM FOR POULTRY HOUSE

An experiment was undertaken at Al-Rashidin in Baghdad to investigate the effect of pad thickness with three levels (7, 10, 13 cm) and three averages of water flow (6, 8, 11l/min) during 21 June 2007 to 3 September 2007. This was to measure out and indoor dry bulb, dew point temperature, cooling efficiency, relative humidity and temperature-humidity index inside the hall. The aim of the research was to determine the best heat performance for the pad contracted from reed and date palm fibers. A factorial experiment with completely randomized design with three replicates was used. Considerable increase in the pad thickness from 7 to 10 and to the 13cm with no change in the rate of water flow led obvious increase in relative humidity and cooling efficiency while decreased the indoor dry bulb temperature, dew point and temperature - humidity index. An obvious decrease was noticed in indoor dry bulb temperature and temperature - humidity index, while increased the other parameters concomitantly with increase in water flow (from 6l/min onward). Higher cooling efficiency (88.2%) and lower temperature-humidity index (66.9) were observed as a result of interaction between the third thickness 13cm and the third water flow (11l/min). A lower (76.9%) cooling efficiency and higher (71.2) tcmperature-humidity index were achieved as a result of the interaction between first pad thickness(7cm) and water flow(6l/min). The pad thickness 13cm with 11l/min water flow gave a dry bulb temperature 20.1c degrees, cooling efficiency 88.2%, dew point 15.1c degrees, relative humidity 76% and THI 66.9. Therefore that combination was recommended, because it was the best during the experiment, as compared with the others.