Analysis of Soot Deposition Effects on Exhaust Heat Exchanger for Waste Heat Recovery System

Tianyu Chen (), Hanqing Li, Yuzeng Wu, Jiaqi Che, Mingming Fang and Xupeng Li
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Tianyu Chen: Marine Design & Research Institute of China, Shanghai 200011, China
Hanqing Li: Marine Design & Research Institute of China, Shanghai 200011, China
Yuzeng Wu: Marine Design & Research Institute of China, Shanghai 200011, China
Jiaqi Che: Marine Design & Research Institute of China, Shanghai 200011, China
Mingming Fang: Marine Design & Research Institute of China, Shanghai 200011, China
Xupeng Li: Marine Design & Research Institute of China, Shanghai 200011, China

Energies, 2024, vol. 17, issue 17, 1-18

Abstract: This study investigates the thermal–hydraulic behavior and deposition characteristics of a shell and tube exhaust heat exchanger using a CFD-based predictive model of soot deposition. Firstly, considering the influences of thermophoretic, wall shear stress, and other deposition and removal mechanisms, a predictive model is developed for long-term performance of heat exchangers under soot deposition. Then, the variations in exhaust heat exchanger performance during a 4 h deposition period are simulated based on the model. Subsequently, the variation of deposition distribution and different deposition velocities are also evaluated. Finally, an analysis of the long-term performance of the exhaust heat exchanger under varying gas velocities and temperature gradients is conducted, revealing the performance variations under all engine-operating conditions. Results show that the deterioration in normalized relative j / f 1 / 2 varies from 5.26% to 24.91% under different work conditions, and the exhaust heat exchanger with high gas velocity and low temperature gradient exhibits optimal long-term performance.

Keywords: waste heat recovery; exhaust heat exchanger; soot deposition; thermal–hydraulic performance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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