Al-Zahrani Salman
Department of Mechanical Engineering, Faculty of Engineering, Al Baha University, Al Baha, 65527 Saudi Arabia.
Heat Mass Transf. 2023 Mar 31:1-15. doi: 10.1007/s00231-023-03360-0.
Saving energy resources requires a continuous improvement of the power equipment. The present study aims to develop new designs of double pipe heat exchanger (DPHE) to improve the heating/cooling processes at the lowest possible pumping power. Therefore, thermal performance investigation of three configurations of DPHE has been carried out. These configurations are circular wavy DPHE (DPHE), plain oval DPHE (DPHE), and an oval wavy DPHE (DPHE). In addition, the conventional DPHE (DPHE) has been employed as a reference heat exchanger, and a validated CFD approach is adopted to perform the current investigation. The findings reveal that, DPHE yields the highest Nusselt number (Nu) which is up to 28% with respect to DPHE. In addition, data of pressure drop (ΔP) of DPHE are found the highest followed by those of DPHE, whereas DPHE is found to yield the lowest ΔP. Furthermore, thermal performance factor () has been considered, and DPHE is found to own the highest of all investigated DPHEs. In conclusion, the oval tubes have shown better heat transfer characteristics with respect to their circular counterparts in general, in particular plain oval DPHE.
节约能源需要不断改进动力设备。本研究旨在开发新型双管热交换器（DPHE）设计，以在尽可能低的泵送功率下改善加热/冷却过程。因此，对三种DPHE结构进行了热性能研究。这些结构分别是圆形波纹DPHE（DPHE）、普通椭圆形DPHE（DPHE）和椭圆形波纹DPHE（DPHE）。此外，传统DPHE（DPHE）被用作参考热交换器，并采用经过验证的计算流体动力学（CFD）方法进行当前研究。研究结果表明，DPHE的努塞尔数（Nu）最高，相对于DPHE高达28%。此外，发现DPHE的压降（ΔP）数据最高，其次是DPHE的，而DPHE的ΔP最低。此外，还考虑了热性能因子（），发现DPHE在所有研究的DPHE中具有最高的。总之，一般来说，椭圆形管相对于圆形管表现出更好的传热特性，特别是普通椭圆形DPHE。
