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Assessment of the Annual Transmission Heat Loss Reduction of a Refurbished Existing Building with an Advanced Solar Selective Thermal Insulation System

  • A numerical parameter sensitivity analysis of the design parameters of the recently published solar selective thermal insulation system (SATIS) has been carried out to enhance its thermal and optical properties. It turned out that the insulation properties of SATIS can be effectively improved by reducing the length of the glass closure element. Increasing the area share of the light conducting elements (LCEs) and decreasing their length-to-diameter (L/D) ratio were identified as key parameters in order to increase the solar gain. Two SATIS variants were compared with the same wall insulation without SATIS in a yearly energetic performance assessment. The SATIS variant with 10 mm length of the closure element, 44.2% area share of LCE, as well as front and rear diameters of 12 mm/9 mm shows an 11.8% lower transmission heat loss over the heating period than the wall insulation without SATIS. A new methodology was developed to enable the implementation of the computed solar gains of SATIS in 1D simulation tools. The result is a radiant heat flow map for integration as a heat source in 1D simulation models. A comparison between the 1D and 3D models of the inside wall heat fluxes showed an integral yearly agreement of 98%.

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Metadaten
Author:Peter SteiningerORCiD, Matthias GadererORCiD, Belal DawoudORCiDGND
DOI:https://doi.org/10.3390/su13137336
Parent Title (English):Sustainability
Publisher:MDPI
Place of publication:Basel
Document Type:Article
Language:English
Year of first Publication:2021
Release Date:2022/02/02
Tag:effective thermal conductivity; parameter sensitivity analysis; radiant heat flow map; solar selective thermal insulation system (SATIS); total solar energy transmittance; yearly energetic performance assessment
Volume:13
Issue:13
Article Number:7336
First Page:1
Last Page:19
Note:
Corresponding author: Belal Dawoud
Institutes:Fakultät Maschinenbau
Fakultät Maschinenbau / Labor Sorptionsprozesse
Begutachtungsstatus:peer-reviewed
OpenAccess Publikationsweg:Gold Open Access- Erstveröffentlichung in einem/als Open-Access-Medium
Corresponding author der OTH Regensburg
research focus:Energie und Mobilität
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International