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Thermal Performance of a Finned-tube Heat Exchanger used in Condensing Gas Boiler
강희찬,김무환,임복빈,이정만 대한설비공학회 2009 International Journal Of Air-Conditioning and Refr Vol.17 No.2
In the present study, an experiment was conducted to investigate the heat and mass transfer performance of heat exchangers used in the condensing gas boiler. Two types of spiral circular fin-tube heat exchangers and a plain tube were tested in the flue gas of propane and dry air. Heat and mass transfer coefficients were measured and compared with the previous correlations. The experimental data for the sensible heat transfer of the plain tube reasonably agreed with the previous correlations for dry air and flue gas. However, the mass transfer coefficient of the plain tube was greater than the previous correlations. The pH, NOx, and SOx data of condensate were provided.
원형휜-원형관 열교환기의 휜효율 이론에 관한 수치적 검증
강희찬(H.C. Kang),임복빈(B.B. Lim),이종휘(J.W. Lee),장병춘(B.C. Chang),안서욱(S.W. Ahn) 한국전산유체공학회 2008 한국전산유체공학회 학술대회논문집 Vol.2008 No.-
The purpose of the present study is to investigate the convective heat transfer characteristics and the validity of fin efficiency of the circular finned-tube heat exchanger by using commercial CFD code. The heat transfer coefficient obtained by using the laminar model was 22% overestimated to the experimental data. The fin surface temperature compared with the experimental data measured by the liquid crystal method. The fin efficiency by the present numerical experiment, defined as normalized and averaged fin surface temperature, was greater than the theoretical fin efficiency and the difference is increased at high value of the factor m.
원형휜-원형관 열교환기의 휜효율 이론에 관한 수치적 검증
강희찬(H.C. Kang),임복빈(B.B. Lim),이종휘(J.H. Lee) 한국전산유체공학회 2009 한국전산유체공학회지 Vol.14 No.4
The purpose of the present study is to investigate the convective heat transfer characteristics and the validity of fin efficiency of the circular finned-tube heat exchanger by using commercial CFD code. The heat transfer coefficient obtained by using the laminar model was 22% overestimated to the experimental data. The fin surface temperature compared with the experimental data measured by the liquid crystal method. The fin efficiency by the present numerical experiment, defined as normalized and averaged fin surface temperature, was greater than the theoretical fin efficiency and the difference is increased at high value of the factor mr?.