Effect on performance of a CTHE by using twisted tapes and Al2O3 nanofluids: an experimental study and correlation development

Sādhanā Pub Date : 2024-06-27 DOI:10.1007/s12046-024-02557-1

H M Shankara Murthy, Ramakrishna N Hegde, Niranjana Rai

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Abstract

The current energy crisis is causing a transformation of tremendous scope and complexity. The natural gas, coal, and electricity sectors have experienced the largest tremors. In this regard, an effort was made to conserve energy by providing a compact heat exchanger that may be utilized to recover waste heat from power plants and industries. This article explores the effect of combined passive techniques on the performance of a CTHE fitted by twisted tapes at hot-side and Al₂O₃ nanofluid used as cold-side fluid. The experiments were conducted by incorporating the differently configured PVTTs and CFTTs (TR: 20, 13.3, and 9.8) in the inner tube with fixed flowrate (Re = 2500) of hot water and using different volume fractions of Al₂O₃ nanofluid (Vol.%: 0.05, 0.1 and 0.15) as cold fluid with varied flow rates (500 ≤ Re ≤ 5000) in the annulus. The results reveal that the PVTT (TR = 20) and 0.05% nanofluid combination increases the Nusselt number by 12.28% and the TPF by 1.127, while the CFTT (TR = 9.8) and 0.15% nanofluid combination increases the Nusselt number by 24.27% and the TPF by 1.263. Hence, CFTT (TR = 9.8) with 0.15% of Al₂O₃ nanofluid provided greater performance in the combinations tested, albeit at the expense of a little pressure loss.

Graphical Abstract

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使用扭曲带和 Al2O3 纳米流体对 CTHE 性能的影响：实验研究和相关性发展

当前的能源危机正在引发一场规模巨大、错综复杂的变革。天然气、煤炭和电力行业受到的冲击最大。为此，人们努力通过提供一种可用于回收发电厂和工业废热的紧凑型热交换器来节约能源。本文探讨了组合式无源技术对热端安装扭曲带、冷端使用 Al2O3 纳米流体的 CTHE 性能的影响。实验采用了不同配置的 PVTT 和 CFTT（TR：20、13.3 和 9.8），在内管中加入固定流速（Re = 2500）的热水，并在环形管中使用不同体积分数的 Al2O3 纳米流体（体积分数：0.05、0.1 和 0.15）作为冷流体，同时改变流速（500 ≤ Re ≤ 5000）。结果显示，PVTT（TR = 20）和 0.05% 纳米流体的组合使努塞尔特数增加了 12.28%，TPF 增加了 1.127；而 CFTT（TR = 9.8）和 0.15% 纳米流体的组合使努塞尔特数增加了 24.27%，TPF 增加了 1.263。因此，CFTT（TR = 9.8）与 0.15% Al2O3 纳米流体的组合在测试中提供了更高的性能，尽管代价是少量的压力损失。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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