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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 und 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, Seite 117029. Elsevier. doi: 10.1016/j.applthermaleng.2021.117029. ISSN 1359-4311.

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Kurzfassung

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.

elib-URL des Eintrags:https://elib.dlr.de/186972/
Dokumentart:Zeitschriftenbeitrag
Titel:Simulation of a rotating drum heat exchanger for latent heat storage using a quasistationary analytical approach and a numerical transient finite difference scheme
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Tombrink, JonasJonas.Tombrink (at) dlr.dehttps://orcid.org/0000-0002-8600-1236NICHT SPEZIFIZIERT
Bauer, DanDan.Bauer (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:25 Juli 2021
Erschienen in:Applied Thermal Engineering
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:194
DOI:10.1016/j.applthermaleng.2021.117029
Seitenbereich:Seite 117029
Verlag:Elsevier
ISSN:1359-4311
Status:veröffentlicht
Stichwörter:Active latent heat thermal energy storage; Rotating drum; Solidification; Time varied finite difference method; Quasistationary calculation; Phase change material
HGF - Forschungsbereich:Energie
HGF - Programm:Materialien und Technologien für die Energiewende
HGF - Programmthema:Thermische Hochtemperaturtechnologien
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SP - Energiespeicher
DLR - Teilgebiet (Projekt, Vorhaben):E - Thermochemische Prozesse
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Thermische Prozesstechnik
Hinterlegt von: Tombrink, Jonas
Hinterlegt am:22 Jul 2022 15:11
Letzte Änderung:26 Jul 2023 03:00

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