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Heat Transfer and Pressure Drop Characteristics of Cross-Flow Plastic Air Heater for a Cooling Tower

냉각탑용 직교류형 플라스틱 공기가열기의 열전달 및 압력손실

  • Kim, Nae-Hyun (Division of Mechanical System Engineering, Incheon National University)
  • 김내현 (인천대학교 기계시스템공학부)
  • Received : 2013.08.14
  • Accepted : 2013.12.05
  • Published : 2013.12.31

Abstract

In this study, experiments were performed on air heater samples with three different shapes (chevron, wave and dimple type) to reduce the plumes from cooling towers. The tests were conducted for a range of frontal air velocities of 1~3 m/s and water flow rate 0.19~0.33 kg/s. The results showed that the heat transfer rate increased with increasing air velocity or water flow rate. The air-side pressure drop also increased with increasing air velocity. At the same frontal air velocity, the highest heat transfer rate was obtained for the chevron sample (1.5~1.7 times compared to that of the plate sample), followed by the dimple, wave and plate samples. The heat transfer rate per unit power consumption was also 15% larger than that of the dimple sample. On the other hand, there was no noticeable difference between the other samples.

Keywords

Heat Transfer;Pressure drop;Cooling Tower;Air Heater

Acknowledgement

Grant : 냉각탑 백연 저감용 판형 플라스틱 공기가열기 개발

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