Journal of Energy Engineering (에너지공학)

The Korean Society for Energy (한국에너지학회)
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A Study on Condensation Heat Transfer in Air Pre-heating Heat Exchanger using Hydrophilic Surface

친수성 표면 처리를 통한 공기 예열 열교환기의 응축 열전달 성능 연구

  • 박재원 (국민대 대학원 기계공학과) ;
  • 황승식 (국민대학교 기계시스템공학부) ;
  • 석성철 (국민대 대학원 기계공학과) ;
  • 신동훈 (국민대 대학원 기계공학과) ;
  • 정태용 (국민대학교 기계시스템공학부) ;
  • 손승길 (경동나비엔)
  • Received : 2013.11.27
  • Accepted : 2014.07.14
  • Published : 2014.09.30
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Abstract

To increase the heat transfer rate of the air pre-heating heat exchanger used for the condensing boiler, We investigated condensation heat transfer coefficients through plasma surface treatment. The hydrophilic surface showed about 10% increase in heat transfer rate than original plate. It shows that Shah correlation can be used to predict the condensation heat transfer coefficient on the original surface within 10% error range after the compatison between Shah correlation and the condensation heat transfer coefficients measured on the hydrophilic surface and original surface. Therefore, we have shown that Shah correlation is available when designing the air pre-heating heat exchanger using the original surface in this study.

콘덴싱 보일러에 이용되는 공기 예열 열교환기에서의 열전달을 향상시키기 위해 전열면에 플라즈마 표면처리가 응축열전달에 미치는 영향에 대하여 연구하였다. 연구 결과 표면처리를 한 친수성 평판이 원판보다 약 10%의 열전달 증진을 보여주었다. 원판과 친수처리 평판에서 측정한 응축 열전달 계수를 Shah 상관식과 비교해 본 결과 Shah 상관식이 원판에서 측정한 응축 열전달 계수를 10% 오차 범위로 잘 예측하는 것으로 나타났다. 따라서, 원판을 이용한 공기예열 열교환기를 설계할 때 Shah 상관식이 이용될 수 있음을 본 연구에서 알 수 있었다.

Keywords

References

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