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Numerical and Experimental Investigation of a Multiple Air Jet Cooling System for Application in a Solar Thermal Receiver

Röger, Marc and Buck, Reiner and Müller-Steinhagen, Hans (2005) Numerical and Experimental Investigation of a Multiple Air Jet Cooling System for Application in a Solar Thermal Receiver. Journal of Heat Transfer, 127 (8), pp. 863-876. American Society of Mechanical Engineers (ASME). DOI: 10.1115/1.1928910 ISSN 0022-1481

Full text not available from this repository.

Official URL: http://dx.doi.org/10.1115/1.1928910

Abstract

The transparent quartz glass window of a high temperature solar receiver (1000°C air outlet temperature, 15bars) has to be protected from overheating. The window is an axially symmetric part that can be approximated by a hemisphere with a cylindrical extension (diameter 0.31m height 0.42m 0.42m). The cooling is accomplished by impinging several air jets onto the concave window surface. Due to concentrated solar radiation, the air supply nozzles can only be installed at the circumference of the cylindrical extension. Symmetric configurations with six or nine nozzles, equally distributed around the window circumference, are examined. A second configuration generates a swirl in the window cavity by inclining the nozzles. In a third, asymmetric configuration, only nozzles on one side are simultaneously charged with mass flow, while a spatial homogenization of heat transfer is reached by periodically modulating the air flows with time. Computational fluid dynamics (CFD) calculations and laboratory measurements of the heat transfer have been carried out. In the performed 3-D simulations, the realizable k-ε model, the k-ω model, and the SST-k-ω model are compared. For measuring the heat transfer coefficient, a periodic-transient measurement technique with high spatial resolution is used. For the application of cooling of the solar receiver window, the jet cooling system with periodically modulated air flows is identified as the best solution.

Item URL in elib:https://elib.dlr.de/105350/
Document Type:Article
Title:Numerical and Experimental Investigation of a Multiple Air Jet Cooling System for Application in a Solar Thermal Receiver
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Röger, MarcMarc.Roeger (at) dlr.dehttps://orcid.org/0000-0003-0618-4253
Buck, ReinerReiner.Buck (at) dlr.deUNSPECIFIED
Müller-Steinhagen, HansInstitut für Thermodynamik und Wärmetechnik, Universität StuttgartUNSPECIFIED
Date:2005
Journal or Publication Title:Journal of Heat Transfer
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:127
DOI :10.1115/1.1928910
Page Range:pp. 863-876
Publisher:American Society of Mechanical Engineers (ASME)
ISSN:0022-1481
Status:Published
Keywords:Solar Thermal Electricity, Solar Receiver, External Window Cooling, Air Jet Cooling of a Concave Surface, Modulated Air Jets, CFD, Numerical Simulation, Heat Transfer, Jet Cooling, Impingement Cooling
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Impact of Desert Environment (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Qualifizierung
Deposited By: Kruschinski, Anja
Deposited On:05 Sep 2016 12:57
Last Modified:06 Sep 2019 15:22

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