Performance Optimization of the Helical Heat Exchanger With Turbulator

Wang Xifeng,Mohammad Ghalandari,Zhang Xiaoluan,Farhad Ghadak,Ibrahim Mahariq,Mostafa Abedini,Mohamed Salem

doi:10.3389/fenrg.2021.789316

Abstract

In this paper, optimization on a two-tube helical heat exchanger with a fin is represented. The spiral pipes heat exchanger which is made of the cooper is adopted for investigation. The effects of three types of fins with the proposed geometric shapes on the overall heat transfer coefficient and pressure loss are investigated. The fins are located on the inner surface of the outer pipe. The obtained numerical results are compared with the experimental results, and a good agreement is observed between the results. The studies show that the total heat transfer coefficient has increased by 170% compared to an exchanger with no fin. Therefore, the best fin has been selected based on the benefit-cost-ratio (BCR) factor. Finally, using the new represented optimization algorithm, the height of the represented triangular fin is optimized to represent the best values for overall heat transfer coefficient and pressure loss of the helical heat exchanger. In addition, the results indicate that reducing the density and height of the triangular fin increases heat transfer and reduces pressure loss.

Highlights

Their study showed that the boundary conditions of constant heat flux and constant wall temperature for a real exchanger have bad effects on efficiency. In their investigation, which was based on experimental results, a relationship had been proposed to calculate the heat transfer coefficient of helical inner tubes
The effect of the pitch angle and the best values of it based on the heat transfer coefficient and pressure loss for the represented helical heat exchanger is evaluated and depicted in Figures 10, 11
The optimization procedure of the helical heat exchanger was represented in this study

Summary

INTRODUCTION

The process of transferring the heat (Ghalandari et al, 2019; Zhao et al, 2021a, Zhao et al, 2021b) between two fluids at different temperatures separated by a solid wall is common in many engineering applications (Che et al, 2021; Mahariq and Erciyas, 2017; Mahariq et al, 2020; Panahi and Zamzamian, 2017; Prabhanjan et al, 2002; Shafee et al, 2020; Zhao et al, 2021c). Their results showed that saturation temperatures have a significant effect on their condensing heat transfer coefficient Another experimental and numerical study on helical heat exchangers has been performed by Jayakumar et al (Mahajani et al, 2008; Xiong et al, 2021). Their study showed that the boundary conditions of constant heat flux and constant wall temperature for a real exchanger have bad effects on efficiency In their investigation, which was based on experimental results, a relationship had been proposed to calculate the heat transfer coefficient of helical inner tubes. The heat transfer characteristics of a helical two-tube exchanger have been numerically and experimentally studied by Kumar et al (2006) They showed that the total heat transfer coefficient of the exchanger increases with increasing De number of the inner tube at a constant flow rate in the space between the two tubes, and vice versa. Based on the represented novel optimization algorithm (Song et al, 2015), the best shape of the selected fin is proposed

METHODOLOGY

CONCLUSION

Findings

DATA AVAILABILITY STATEMENT