루버핀-관 열교환기의 습조건에서의 열전달 및 마찰특성에 대한 실험 연구

권영철; 장근선; Young Chul Kwon; Keun Sun Chang

Journal of the Korean Industrial and Engineering Chemistry, Vol.19, No.1, 73-79, February, 2008

Export Citation

루버핀-관 열교환기의 습조건에서의 열전달 및 마찰특성에 대한 실험 연구

Heat Transfer and Friction Characteristics of Louver Fin and Tube Heat Exchangers under Wet Conditions

권영철 ^†, 장근선

선문대학교 기계공학부

Young Chul Kwon^†, and Keun Sun Chang

Division of Mechanical Engineering, Sunmoon University, Chungnam 336-708, Korea

E-mail:

초록

본 연구에서는 핀-관 열교환기의 공기측 열전달, 마찰 그리고 물질특성을 조사하기 위하여 6종의 열교환기에 대하여 습조건에서 실험을 수행하였다. 실험에 사용된 핀은 루버형으로 핀피치, 관 열수 그리고 입구상대습도를 변화하였다. 루버핀-관열교환기의 열전달계수와 마찰계수는 레이놀즈 수가 증가할수록 감소하였으며, 핀피치가 줄어들수록 열전달계수는 감소하였고 마찰계수는 증가하였다. 3열 열교환기의 열전달계수와 마찰계수의 핀피치 변화에 따른 영향은 2열 열교환기의 경우보다 덜 민감하였다. 그리고 유입공기의 상대습도에 대한 열전달계수와 마찰계수의 변화폭은 크지 않았다. 또한, 루버핀-관열교환기의 물질전달계수는 핀피치가 감소할수록 줄어들었으나, 레이놀즈 수 변화에 따른 물질전달계수는 열전달계수와는 달리 관 열수에 따라 서로 다른 경향을 보였다. 유입공기의 상대습도가 높아질수록, 물질전달계수는 다소 줄어 들었다.

An experimental study was conducted to investigate the effect of a tube row, a fin pitch and an inlet humidity on air-side heat and mass transfer performance of louvered fin-tube heat exchangers under wet conditions. Experimental conditions were varied by three fin pitches, two rows, two inlet relative humidities. Experimental results showed that the heat transfer performance decreased and the friction increased with the decrease of fin pitch, for 2 row heat exchanger. The effect of fin pitch on heat transfer performance was negligible with 3 row heat exchanger. The changes in relative humidity was not affected heat transfer and friction. However, the mass transfer performance was slightly decreased with the increase of relative humidity and with the decrease of fin pitch. The mass transfer performance of the louvered fin-tube heat exchanger decreased with the decrease of the fin pitch and was different according to the number of tube row.

Keywords:louver fin;heat exchanger;wet condition;heat transfer;friction

[References]

Wang CC, Lin YT, Lee CJ, Int. J. Heat Mass Transf., 43(18), 3443 (2000)
Fu WL, Wang CC, Chang WR, Chang CT, ASME, 320, 75 (1995)
Korte C, Jacobi AM, J. Heat Transf. -Trans. ASME, 123, 926 (2001)
Pirompugd W, Wongwises S, Wang CC, Int. J. Heat Mass Transf., 49(1-2), 132 (2006)
Gnielinski V, Int. Chem. Engineering, 16, 359 (1976)
Hong TK, Webb RL, Ph. D. thesis, Pennsylvania State University, Pennsylvania, United State (1996)
Moffat RJ, Exp. Therm. Fluid Sci., 1, 3 (1988)
Yoshii T, Yamamoto M, Otaki M, 13th International Congress of Refrigeration, 85 (1973)

[Related Articles]

[1] Wang CC, Lin YT, Lee CJ, Int. J. Heat Mass Transf., 43(18), 3443 (2000)

[2] Fu WL, Wang CC, Chang WR, Chang CT, ASME, 320, 75 (1995)

[3] Korte C, Jacobi AM, J. Heat Transf. -Trans. ASME, 123, 926 (2001)

[4] Pirompugd W, Wongwises S, Wang CC, Int. J. Heat Mass Transf., 49(1-2), 132 (2006)

[5] Gnielinski V, Int. Chem. Engineering, 16, 359 (1976)

[6] Hong TK, Webb RL, Ph. D. thesis, Pennsylvania State University, Pennsylvania, United State (1996)

[7] Moffat RJ, Exp. Therm. Fluid Sci., 1, 3 (1988)

[8] Yoshii T, Yamamoto M, Otaki M, 13th International Congress of Refrigeration, 85 (1973)