Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Performance Comparison of Heat Transfer Plates for Cooling Tower Air Heater Through Numerical Analysis

냉각탑 공기가열기용 전열판의 수치해석적 성능 비교

  • Lee, Eul-Jong (Department of Mechanical System Engineering, University of Incheon) ;
  • Kim, Jung-Sik (Division of Technical Innovation, Incheon Technopark) ;
  • Kim, Nae-Hyun (Department of Mechanical System Engineering, University of Incheon)
  • 이을종 (인천대학교 기계시스템공학과) ;
  • 김정식 ((재)인천테크노파크 기술혁신본부) ;
  • 김내현 (인천대학교 기계시스템공학과)
  • Received : 2012.09.19
  • Accepted : 2012.12.06
  • Published : 2012.12.31
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Abstract

In this study, numerical analysis was performed on three shapes of heat transfer plates (chevron, wave and dimple type), which are currently used as fillers of cooling towers. Results show that heat transfer rates per consumed power were larger for enhanced plates as compared with that of plain plate. Highest heat transfer coefficient was obtained for wave shape followed by chevron and dimple shape. For wave shape, cross corrugations induced significant mixing of fluids, which enhanced the heat transfer. Friction factor yielded a similar trend with the heat transfer coefficient. However, heat transfer rate and pressure drop per sheet was the largest for chevron shape, due to the largest heat transfer area per sheet.

본 연구에서는 백연방지용 냉각탑의 공기가열기 적용을 목적으로 현재 냉각탑의 충진재로 적용되고 있는 쉐브론형, 웨이브형 그리고 딤플형 전열판 형상에 대한 수치해석을 수행하였다. 해석 결과 동일 소비동력 대비 전열량은 평판보다 고성능 전열판에서 높게 나타났다. 열전달계수는 웨이브 형상에서 가장 크고 쉐브론 형상, 딤플 형상 순으로 나타났다. 웨이브 형상의 경우 교차하는 절곡형상 사이의 왕성한 혼합유동이 열전달 계수를 증진시킨 것으로 판단된다. 마찰계수는 열전달계수와 유사한 경향을 보였다. 하지만 동일 크기 쉬트에서의 전열량 및 압력손실은 쉐브론형에서 가장 크게 나타났다. 이는 쉐브론 형상의 전열면적이 다른 형상에 비하여 월등히 크기 때문이다.

Keywords

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