| Title |
Heat Transfer Characteristics of Individual Rows for Fin-and-Tube Heat Exchangers |
| Authors |
김내현(Nae-Hyun Kim) ; 신태룡(Tae-Ryong Shin) ; 한성필(Sung-Pil Han) |
| Keywords |
열교환기 ; 열전달계수 ; 핀-관 ; 열별 ; 웨이브 핀 ; 평판 핀 Heat exchanger ; Heat transfer coefficient ; Fin-tube ; Row-by-row ; Wave fin ; Plain fin ; |
| Abstract |
The row-by-row heat transfer characteristics of fin-and-tube heat exchangers were experimentally investigated. Three wavy fin samples having different rows(one, two and three) and one plain fin sample(three row) were tested for 600≤≤4,000. The heat trans-fer data were obtained for individual rows, and the corresponding heat transfer coefficients were reduced from the data. Results showed that the heat transfer coefficients were strongly dependent on the tube row. The heat transfer coefficient decreased as the tube row increased. However, the row effect was different depending on the fin shape. For the wavy fin, the row effect significantly decreased as the Reynolds number increased, yielding approximately the same heat transfer coefficients at 2,500. For the plain fin, however, the row effect lasted for the whole Reynolds number range. The increased mixing of bulk flow by wavy channels appears to induce high heat transfer coefficient(accordingly diminishing row effect) at downstream rows. The heat transfer coefficients of individual rows were higher for heat exchangers having larger tube rows. |