Refrigeration Performance Analysis of Fin tube Heat Exchangers by Effect of Perforated Fin Geometry

Abstract:

Three types of optimal perforated fin were chosen based on an analysis of orthogonal test and numerical simulation combination method, as the plain fin for based case, the four types of fin were employed on fin tube heat exchangers. The optimization of fin perforated parameters including three factors: the hole shape, the hole geometry dimension and the location. By wind tunnel experiments, it was demonstrated that elliptic perforated fin tube refrigerated heat exchangers had the best heat exchange ability with 1.5~5.2 m·s-1 air velocity under frosting conditions among the four types heat exchanger. When the air velocity was 2.5 m·s-1, the results illustrated that SK E B type elliptic perforated fin tube exchangers could increase refrigeration capacity per unit area, average fin surface heat transfer coefficient, compressor’s coefficient of performance by 37.8%,79.4%,25.0% respectively, while mean air flow resistance through the SK E B fin tube decreased by 30.0%.

Key words:perforated fin; frosting conditions; fin tube heat exchanger; orthogonal test