The heat transfer performance of the air–water double pipe heat exchanger (HE) was experimentally investigated. Segmental baffles with semi-circular perforations were introduced in the annular side of HE. Each baffle contains semi-circular fins. Air was used as a working fluid in the annular while, water for the inner tube. Seven different air Reynold’s numbers range from 2700 to 4000 were selected. While water side Reynold’s number fixed at 34,159. Three different semi-circular perforation diameters were studied (30, 25, and 20 mm) to investigate their effect on HE thermal performance. The Nu number, overall heat transfer coefficient, friction factor, and thermal performance factor (TPF) were calculated. Also, compassion for the baffled and un-baffled pipe was done. It was observed that the thermal performance of the baffled pipe HE was better than the un-baffled one. The average overall heat transfer coefficient increases by 29.7%, 62%, and 80.6% by using perforated baffles with 30, 25, and 20 mm perforation diameters. The TPF of the heat exchanger with all studied perforated baffles cases is above unity and the best thermal performance obtained by using baffles was with 20 mm perforation diameter.

吨空气-水双管换热器（HE）的传热性能进行了实验研究。在HE的环形侧引入具有半圆形穿孔的节段挡板。每个挡板包含半圆形翅片。空气用作环形管中的工作流体，而水用作内管。选择了七个不同的空气雷诺数，范围从 2700 到 4000。而水边雷诺的数字则固定为 34,159。研究了三种不同的半圆形穿孔直径（30、25 和 20 毫米），以研究它们对 HE 热性能的影响。计算了 Nu 数、总传热系数、摩擦系数和热性能系数 (TPF)。此外，对有挡板和无挡板的管道表示同情。据观察，有挡板的管道 HE 的热性能优于无挡板的管道。通过使用穿孔直径为 30、25 和 20 mm 的穿孔挡板，平均整体传热系数增加了 29.7%、62% 和 80.6%。所有研究的带孔挡板的换热器的 TPF 均高于 1，使用 20 mm 穿孔直径的挡板获得的最佳热性能。