关键词: H型鳍片管, 传热, 流动, 综合性能, 数值模拟

Abstract:

Two indicators were proposed to evaluate the performance of H-type finned tube, i.e. the heat exchange per unit mass and the recovered heat transfer per unit power of the fan, and a selection method was derived to determine the structure parameters for the H-type finned tube. Numerical studies were performed to investigate the H-type finned tube with different fin widths and pitches. The results show that with the increase of fin width, the heat transfer per unit mass of finned tube increases first and then deceases, and when this indicator reaches the maximum value with different fin pitches, the fin width is between 55 and 60 mm. With the increase of fin width, the recovered heat transfer per unit power of the fan also increases first and then deceases, but when this indicator reaches the maximum value with different fin pitches, the fin width increases gradually. The fin pitch has the minimum value when both indicators reach the maximum value, so the two indicators as well as the manufacturing process and fouling characteristics should be taken into consideration for selecting the structure parameters.

Key words: H-finned tube, heat transfer, flow, comprehensive performance, numerical simulation