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Experimental validation of a continuum model for local heat transfer in shell-and-tube moving-bed heat exchangers

Hertel, Julian D. and Zunft, Stefan (2022) Experimental validation of a continuum model for local heat transfer in shell-and-tube moving-bed heat exchangers. Applied Thermal Engineering, 206 (118092). Elsevier. doi: 10.1016/j.applthermaleng.2022.118092. ISSN 1359-4311.

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Moving-bed heat exchangers with a horizontal tube arrangement offer a promising solution to exchange high-temperature heat with a particle stream. However, in order to guide the design of such heat exchangers, accurate and time-efficient simulation tools capable of capturing the complex heat transfer characteristics still need to be improved. In this article we present experimental results of the local heat transfer coefficients around the tube circumference of a heat exchanger mockup. To this end, specially prepared measuring probes were developed and a test campaign was conducted. A comprehensive thermal model was applied to the setup under consideration. This model takes into account the temperature-dependent thermophysical properties of the bulk, variable temperature boundary conditions, and the increased thermal resistance caused by the stagnation and void zones. To validate the model, calculated and experimental results were compared. It turns out that the predicted heat transfer coefficients well match the experimental data, albeit with slight deviations at the stagnation and void zones of the tubes. The prediction of a tube’s area-weighted heat transfer coefficient, which constitutes the most important factor for design purposes, yields results with errors of less than 3%. Therefore, it is concluded that the proposed thermal model is able to well predicts the heat transfer in shell-and-tube moving-bed heat exchangers.

Item URL in elib:https://elib.dlr.de/186390/
Document Type:Article
Title:Experimental validation of a continuum model for local heat transfer in shell-and-tube moving-bed heat exchangers
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Hertel, Julian D.Julian.Hertel (at) dlr.deUNSPECIFIED
Zunft, StefanStefan.Zunft (at) dlr.dehttps://orcid.org/0000-0002-8499-3067
Date:21 January 2022
Journal or Publication Title:Applied Thermal Engineering
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.applthermaleng.2022.118092
Keywords:Moving-bed heat exchanger, Granular materials, Continuum model, Particle image velocimetry, Concentrating solar power
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Hertel, Julian
Deposited On:20 May 2022 13:13
Last Modified:20 May 2022 13:13

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