A study of water spraying efficiency in evaporative cooling chiller

• Main Authors: XU,JIN JIA, 許晉嘉
• Other Authors: 簡良翰
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/ncpj38

碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系碩士班 === 101 === This study aims to investigate the water spray uniformity of sprinkler in an evaporative condenser. Experiments of water droplet distribution are conducted with 50 water collectors, and the nozzle spray droplets patterns were observed during the tests. Three different combinations of nozzle opening length and width (4 cm x 0.7 cm, 4cm x 1 cm, and 3.5 cm x 0.8 cm) were tested with the flow rates varied at 135 LPM and 176.4 LPM. The nozzle spacing were either 15 cm or 17cm, and the distance between water collector and nozzle ranged from 16 cm to 32 cm. Experimental results show that the cross-sectional area of nozzle opening and flow rate significantly affect the water spray uniformity. If the water flow speed can be effectively controlled, this will help to shorten the impact distance, which improves spattering phenomenon and increases the ratio of collected fluid. In this study, at high flow rate, the nozzle opening with 4 cm in length and 1 cm in width transports/channels provides better water spray uniformity compared to the nozzle opening with 4 cm in length and 0.7 cm in width. On the other hand, at low flow rate, the nozzle opening with 4 cm in length and 0.7 cm in width provides better impacting effect with the nozzle spacing of 17 cm, yet the nozzle opening with 4 cm in length and 1 cm in width performs better with the nozzle spacing of 15 cm. The latter case, with the smaller nozzle spacing and bigger nozzle opening size, leads to a shorter impact distance of the spraying flow from two adjacent nozzles﹐and subsequently the spattering of water droplets is more pronounced.