다분지 미니 채널 열교환기의 액단상 열전달 특성에 관한 연구

This research focused on the multi-pass heat exchanger using the minichannel possessing the spring fin. An air-water was used as working fluid. The characteristics of liquid single phase heat transfer were verified. The compact heat exchanger (heat transfer area density : β= 2,146 ㎡/㎥), based on the shape of header(Top combining header), 63 minichannels (D<SUB>i</SUB> : 1.4 ㎜, L : 0.25 m) and the air side adopting the copper wire spring fin, was fabricated. The heat transfer area density of the air side was improved up to 161% when compared with the conventional fin-tube heat exchanger that adopts the heat transfer tube with the inner diameter of 5 ㎜. With regard to heat transfer performance, heat transfer rate per unit volume increased up to 142% when compared with the fin-tube heat exchanger adopting the heat transfer tube with the inner diameter of 5 ㎜.