Study of Free-Convective Heat Exchange of Air-Coolable Finned Tube Bundles Intensified by Exhaust Shaft

The results of experimental studies free-convective heat transfer single-, double- and four-row bundles finned tubes without with an exhaust shaft are presented. It is shown that the inter-tube spacing significantly affects energy efficiency bundle. optimum 61 mm for single-row, about 70 double-row, over bundles. With increase number rows in bundle specific capacity increases, but rate its decreases. a single-row 58 higher than 64 mm. two- less at low heights, it more when relative height 0.14 0.26, respectively. can be increased (more threefold) using optimal ratio outlet section flow tube.