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Numerical analysis of wind-induced convective heat losses in large-scale open volumetric cavity receivers and the evaluation of countermeasures

Drexelius, Maximilian and Schwarzbözl, Peter and Pitz-Paal, Robert (2024) Numerical analysis of wind-induced convective heat losses in large-scale open volumetric cavity receivers and the evaluation of countermeasures. Solar Energy. Elsevier. ISSN 0038-092X. (Submitted)

Full text not available from this repository.

Abstract

This study investigates the wind influence on the operation of an open volumetric cavity receiver (OVR) designed with a tower height of approximately 200 m and a total thermal power of 240 MWth. The receiver design incorporates an air return system where parts of the air are returned between the OVR modules after the heat exchange, while the remainder is recirculated externally from below the receiver. When operating such a scaled-up OVR, ambient wind becomes a relevant parameter in terms of convective losses and the air return ratio, which must be maintained at a high level to ensure economic viability. In this study, ambient wind and the receiver flow are modelled by CFD simulations with the RANS approach. In addition to the evaluation under windless conditions, the simulations in this study cover lateral wind at 4 and 8 m/s wind speed. The simulations show the vulnerability of externally returned air as it is significantly influenced by lateral wind. As a countermeasure, wind-adjusted external return air distributions are investigated, which show the potential to reduce convective heat losses due to incomplete air return. In addition, the application of aerowindows is investigated, which has limited potential due to the size of the receiver aperture. The results highlight the importance of the design of the external air return system and suggest a controllable return air system that can be adapted to the current wind situation.

Item URL in elib:https://elib.dlr.de/199349/
Document Type:Article
Title:Numerical analysis of wind-induced convective heat losses in large-scale open volumetric cavity receivers and the evaluation of countermeasures
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Drexelius, MaximilianUNSPECIFIEDhttps://orcid.org/0000-0001-6591-4039UNSPECIFIED
Schwarzbözl, PeterUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pitz-Paal, RobertUNSPECIFIEDhttps://orcid.org/0000-0002-3542-3391UNSPECIFIED
Date:2024
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Publisher:Elsevier
ISSN:0038-092X
Status:Submitted
Keywords:open volumetric receiver, cfd, convective heat losses, air return ratio, counter measures
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 - Smart Operation
Location: Jülich
Institutes and Institutions:Institute of Solar Research > Solar Power Plant Technology
Deposited By: Drexelius, Maximilian
Deposited On:17 Nov 2023 11:51
Last Modified:17 Nov 2023 11:51

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