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A new partitioned 1D LTNE continuum model for the simulation of 3D-shaped honeycomb absorbers

Broeske, Robin Tim and Schwarzbözl, Peter and Hoffschmidt, Bernhard (2022) A new partitioned 1D LTNE continuum model for the simulation of 3D-shaped honeycomb absorbers. Solar Energy (236), pp. 533-547. Elsevier. doi: 10.1016/j.solener.2022.02.024. ISSN 0038-092X.

[img] PDF - Only accessible within DLR bis 1 April 2024 - Postprint version (accepted manuscript)
[img] PDF - Only accessible within DLR - Published version

Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0038092X22001219


Porous absorber structures intended for open volumetric receivers of central tower power plants are receiving significant attention in current research. Due to the geometric complexity, volume-averaged continuum models are a common tool for the simulation of volumetric absorbers. Widely established for the investigation of ceramic foams, existing continuum models are less suitable for the simulation of honeycomb absorbers. 3Dshaped honeycomb absorber designs, i.e. absorbers with varying cross-sections, can pose additional challenges in the form of internal front-like surfaces, which are oriented perpendicular to the main channel axis. Due to the importance of the internal front-like surfaces w.r.t. absorption of solar radiation and convective heat transfer, a new partitioned 1D LTNE continuum model is proposed. The key innovation is the division of the absorber geometries into distinct sections forming a set of coupled LTNE models. The new 1D continuum model has been successfully validated against a 3D CFD model. For nine compared simulation cases, the calculated thermal absorber efficiencies differ on average 0.81 percentage points between the two models. Simulations have been conducted for the state-of-the-art HiTRec absorber and two new absorber geometries. The StepRec absorber, a monolithic channel design with characteristic step-pins created, via ceramic 3D screen printing out of SiSiC, reaches a thermal efficiency of up to 89.5 % for an air outlet temperature of 700 °C. A volumetric effect is predicted by for the new Emitec absorber, a channel geometry made of thin metal sheets, depending on the incident irradiation with efficiencies of up to 85.8 % at 700 °C.

Item URL in elib:https://elib.dlr.de/186694/
Document Type:Article
Title:A new partitioned 1D LTNE continuum model for the simulation of 3D-shaped honeycomb absorbers
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Broeske, Robin TimUNSPECIFIEDhttps://orcid.org/0000-0001-5157-6251UNSPECIFIED
Schwarzbözl, PeterUNSPECIFIEDhttps://orcid.org/0000-0001-9339-7884UNSPECIFIED
Date:1 April 2022
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 533-547
Keywords:open volumetric receiver, CFD simulation, LTNE model
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 SW - Solar and Wind Energy
DLR - Research theme (Project):E - Advanced Heat Transfer Media
Location: Jülich
Institutes and Institutions:Institute of Solar Research > Solar Power Plant Technology
Deposited By: Broeske, Robin Tim
Deposited On:26 Oct 2022 11:32
Last Modified:26 Oct 2022 11:32

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