Evaluation of double pipe heat exchanger performance with right angle turbulator

Abstract

In this paper, two horizontal cross-flow pipes were experimentally investigated. Three discharge rates for hot water were used, namely 1.5, 2.5, and 3 liters per minute, while maintaining a 6 liters per minute cold water discharge rate. Comparing the discharge rates in both instances and relying on the hot water discharge rate that results in the biggest heat exchange was done. The first (typical) type involved the analysis of a heat exchanger with two horizontal tubes of convection flow; in this case, there were no additives in the hot pipe, and the best rate of hot water discharge was 1.5 liters per minute. As a result, the optimal Nusselt number was identified. In the second part, right-angle turbulators with dimensions of 1 mm, 5 mm, and 7 mm were added inside the hot pipe to enhance the heat exchange. It was discovered that the Nusselt number is significantly better than the typical situation (without angles). When adding this kind of turbulator, the Nusselt number is enhanced by 28.1%.