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Simulation of a rotating drum heat exchanger for latent heat storage using a quasistationary analytical approach and a numerical transient finite difference scheme

Tombrink, Jonas and Bauer, Dan (2021) Simulation of a rotating drum heat exchanger for latent heat storage using a quasistationary analytical approach and a numerical transient finite difference scheme. Applied Thermal Engineering, 194, p. 117029. Elsevier. doi: 10.1016/j.applthermaleng.2021.117029. ISSN 1359-4311.

Full text not available from this repository.

Abstract

With the concept of the rotating drum heat exchanger, latent heat can be released with a high and constant surface specific heat flux. Phase change material (PCM) solidifies on the outer surface of a drum, which is steadily removed by a fixed scraper during rotation. Two novel calculation approaches for determining the heat transfer and the layer thickness for a rotating drum heat exchanger are developed and validated with existing experimental data. This includes the identification of correlations for the thickness of the adhering liquid layer after the surface emerges from the liquid PCM and the local surface coefficient of heat transfer on the outside of a partially immersed rotating drum. While a calculation approach based on the quasistationary simplification underestimates the experimentally measured heat transfer for rotational speeds above 4 min^-1 by 31% on average, a detailed transient numerical simulation based on a time-varying finite difference scheme reproduces the experimentally measured heat transfer with an accuracy of 8% on average. By applying the transient numerical simulation to a rotating drum heat exchanger using sodium nitrate as the PCM, a surface specific heat transfer based on the entire drum surface of up to 400 kW*m^-2 can be assumed, showing the high potential of the rotating drum heat exchanger for industrial and power plant applications.

Item URL in elib:https://elib.dlr.de/142941/
Document Type:Article
Title:Simulation of a rotating drum heat exchanger for latent heat storage using a quasistationary analytical approach and a numerical transient finite difference scheme
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Tombrink, JonasJonas.Tombrink (at) dlr.dehttps://orcid.org/0000-0002-8600-1236
Bauer, DanDan.Bauer (at) dlr.deUNSPECIFIED
Date:25 July 2021
Journal or Publication Title:Applied Thermal Engineering
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:194
DOI :10.1016/j.applthermaleng.2021.117029
Page Range:p. 117029
Publisher:Elsevier
ISSN:1359-4311
Status:Published
Keywords:Active latent heat thermal energy storage; Rotating drum; Solidification; Time varied finite difference method; Quasistationary calculation; Phase change material
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: Tombrink, Jonas
Deposited On:20 Jul 2021 14:27
Last Modified:20 Jul 2021 14:27

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