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물결형 슬릿핀이 장착된 핀-관 열교환기의 습표면 성능 실험
김내현,김정식,조진표,윤재호,백종현,이순구,남승백,권형진,Kim, N.H.,Kim, J.S.,Cho, J.P.,Yun, J.H.,Peck, J.H.,Lee, S.G.,Nam, S.B.,Kwon, H.J. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.2
In this study, the wet surface heat transfer coefficients and friction factors of the heat exchanger with slit-wavy fin were measured. Four sample cores of two or three row with fins of 12 fpi or 16 fpi were tested. Tests were conducted in a closed loop wind tunnel, where the heat exchanger was mounted at 45 degree inclination angle. The wet surface heat transfer coefficient was reduced following the procedure given in ARI 420-81. During the course, new definitions of the $\varepsilon$-NTU applicable to enthalpy driving system were introduced. The wet surface heat transfer coefficients were approximately equal to the dry surface values. However, the friction factors were approximately 120% to 170% higher than those of the dry surface. Both the heat transfer coefficient and the friction factor of the wet surface increased as the relative humidity increased, fin pitch decreased, and the number of row decreased, although the difference was not large.