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Experimental and Numerical Study on the Heat Transfer Characteristics of a Newly-Developed Solar Active Thermal Insulation System

  • A newly-developed solar active thermal insulation system (SATIS) is introduced with the main objective to accomplish a highly-dependent total solar transmittance on the irradiation angle. SATIS is also designed to obtain the maximum transmittance at a prescribed design irradiation angle and to reduce it remarkably at higher irradiation angles. A purely mineral thermal insulation plaster with micro hollow glass spheres is applied to manufacture the investigated SATIS prototype. Light-conducting elements (LCEs) have been introduced into SATIS and suitable closing elements have been applied. The SATIS prototype has been investigated both experimentally and numerically. It turned out that the contributions of conduction, radiation and convection to the effective thermal conductivity of SATIS, without the closing elements (49 mWmK), amount to 86.2%, 13.2% and 0.6%, respectively. The angle-dependent short-wave radiation exchange within the LCE has been investigated via ray tracing. At the incidence angle of 19% (design angle), 27% of the radiation within the LCE is absorbed by the absorber plate, resulting in measured and computed total solar energy transmittances of 11.2%/11.7%, respectively. For a typical summer irradiation angle of 60%, 98% of the incident radiation is absorbed by the surfaces at the entrance of the LCE. The corresponding total solar energy transmittance amounts to 2.9%.

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Metadaten
Author:Peter SteiningerORCiD, Matthias GadererORCiD, Oliver SteffensORCiDGND, Belal DawoudORCiDGND
DOI:https://doi.org/10.3390/buildings11030123
Parent Title (English):Buildings
Publisher:MDPI
Document Type:Article
Language:English
Year of first Publication:2021
Release Date:2022/02/01
Tag:angle-dependent total solar energy transmittance; effective thermal conductivity; experimental investigation; numerical simulation; ray tracing; solar active thermal insulation system (SATIS)
Volume:11
Issue:3
Article Number:123
First Page:1
Last Page:22
Note:
Corresponding author: Belal Dawoud
Institutes:Fakultät Angewandte Natur- und Kulturwissenschaften
Fakultät Maschinenbau
Fakultät Angewandte Natur- und Kulturwissenschaften / Labor Bauphysik
Begutachtungsstatus:peer-reviewed
OpenAccess Publikationsweg:Gold Open Access- Erstveröffentlichung in einem/als Open-Access-Medium
Corresponding author der OTH Regensburg
research focus:Gebäude und Infrastruktur
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International