냉각탑용 직교류형 플라스틱 공기가열기의 열전달 및 압력손실

국문 초록 (Abstract)

본 연구에서는 냉각탑 출구의 상대습도를 낮춰 백연을 저감하기 위한 목적으로 쉐브론형, 웨이브형 그리고 딤플형 공기가열기 시료에 대한 성능시험을 수행하였다. 실험은 시료의 전방풍속 1~3 m/s, 물 유량 0.19~0.33 kg/s 범 위에서 수행되었다. 실험 결과 모든 시료에서 전열량은 전방풍속과 물 유량이 증가할수록 증가하였다. 공기측 압력손 실도 풍속이 증가할수록 증가하였다. 동일 풍속에서 전열량은 쉐브론 형상에서 가장 크고 (평판의 1.5~1.7배) 딤플, 웨이브, 평판 순으로 나타났다. 소비동력 대비 전열량도 쉐브론 형상에서 딤플 형상보다 15% 정도 크게 나타났다. 하 지만 다른 세 종류의 형상에서는 큰 차이를 보이지 않았다.

다국어 초록 (Multilingual Abstract)

In this study, experiments were performed on air heater samples with three different shapes (chevron, wave and dimple type) to reduce theplumes 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.

참고문헌 (Reference)

1 유성연, "플라스틱 판형 열교환기의 성능에 영향을 미치는 인자에 관한 연구" 대한설비공학회 17 (17): 839-848, 2005

2 유성연, "플라스틱 판형 열교환기의 성능에 관한 실험적 연구" 대한설비공학회 17 (17): 117-124, 2005

3 이을종, "냉각탑 공기가열기용 전열판의 수치해석적 성능 비교" 한국산학기술학회 13 (13): 5676-5683, 2012

4 Clearflow Application, "Users Manual"

5 J. C. Campbell, "The Prevention of Fog from Cooling Towers" 1976

6 R. L. Webb, "Principles of enhanced heat transfer" Taylor and Francis 2005

7 A. Cooper, "Plate Heat Exchangers, in Heat Exchanger Design Handbook" Hemisphere Publisher 1983

8 M. Ciafalo, "Investigation of Flow and Heat Transfer in Corrugated Passages" 39 : 165-192, 1996

9 B. Sunden, "Flow and Heat Transfer Mechanisms in Plate-Frame Heat Exchangers, in Heat Transfer Enhancement of Heat Exchangers" Kluwer Academic Pub. 185-206, 1999

10 M. Kim, "Experimental Investigation of an Cross-Flow Air-Cooled Heat Exchanger with Single-Wave and Double-Wave Plates" 21 : 347-354,

11 K. H. Lee, "Comparison of performance of cooling water with various shape of packings" 10 : 358-367, 1998

12 S. M. Zivi, "An Analysis of the Cross-flow Cooling Tower" 64 : 31-34, 1956

13 "ASHRAE Standard 41.5, Standard Measurement Guide, Engineering Analysis of Experimental Data"

14 "ASHRAE Standard 41.2, Standard Method for Laboratory Air-Flow Measurement"

15 "ASHRAE Standard 41.1, Standard Method for Temperature Measurement"

16 C. K. Choi., "A Numerical Study on the Performance Analysis of the Plume Abatement NWD Cooling Tower" 11 : 1049-1058, 2001

17 M. H. Chung, "A Numerical Study on the Flow and Heat Transfer Characteristics of Plastic Plate Heat Exchanger" SAREK 1366-1371, 2008

18 H. J. Ahn, "A Numerical Simulation of Flow and Heat Transfer in a Dimpled-Type Plate Heat Exchanger" 22 : 149-155, 2010

19 D. R. Baker, "A Comprehensive Approach to the Analysis of Cooling Tower Performance" 83 : 339-349, 1961