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

Peter Steininger, Matthias Gaderer and Belal Dawoud
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Peter Steininger: Faculty of Mechanical Engineering, Laboratory of Advanced Energy and Building Systems, East Bavarian Technical University of Applied Sciences Regensburg (OTH Regensburg), 93049 Regensburg, Germany
Matthias Gaderer: TUM Campus Straubing for Biotechnology and Sustainability, Chair of Regenerative Energy Systems, Technical University of Munich, 94315 Straubing, Germany
Belal Dawoud: Faculty of Mechanical Engineering, Laboratory of Advanced Energy and Building Systems, East Bavarian Technical University of Applied Sciences Regensburg (OTH Regensburg), 93049 Regensburg, Germany

Sustainability, 2021, vol. 13, issue 13, 1-19

Abstract: 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%.

Keywords: solar selective thermal insulation system (SATIS); parameter sensitivity analysis; yearly energetic performance assessment; radiant heat flow map; effective thermal conductivity; total solar energy transmittance (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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