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Buildings 2017, 7(1), 8; doi:10.3390/buildings7010008

High Energy-Efficient Windows with Silica Aerogel for Building Refurbishment: Experimental Characterization and Preliminary Simulations in Different Climate Conditions

1
Department of Engineering, University of Perugia, Via G. Duranti 67, 06125 Perugia, Italy
2
ENEA Casaccia Research Centre, Via Anguillarese 301, 00123 Rome, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Gianpiero Evola
Received: 29 November 2016 / Revised: 4 January 2017 / Accepted: 10 January 2017 / Published: 16 January 2017
(This article belongs to the Special Issue Building Refurbishment and Energy Performance)
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Abstract

The paper deals with the potential of high energy-efficient windows with granular silica aerogel for energy saving in building refurbishment. Different glazing systems were investigated considering two kinds of granular silica aerogel and different glass layers. Thermal transmittance and optical properties of the samples were measured and used in building simulations. The aerogel impact on heat transfer is remarkable, allowing a thermal transmittance of 1.0–1.1 W/(m2·K) with granular aerogel in interspace only 15 mm in thickness. A 63% reduction in U-value was achieved when compared to the corresponding conventional windows, together with a significant reduction (30%) in light transmittance. When assembled with a low-e glass, the U-value reduction was lower (31%), but a moderate reduction in light transmittance (about 10%) was observed for larger granules. Energy simulations for a case study in different climate conditions (hot, moderate, and cold) showed a reduction in energy demand both for heating and cooling for silica aerogel glazing systems, when compared to the conventional ones. The new glazings are a suitable solution for building refurbishment, thanks to low U-values and total solar transmittance, also in warm climate conditions. View Full-Text
Keywords: high energy-efficient windows; nanogel windows; silica aerogel; building refurbishment; Nearly Zero Energy Buildings (NZEBs); energy saving in buildings high energy-efficient windows; nanogel windows; silica aerogel; building refurbishment; Nearly Zero Energy Buildings (NZEBs); energy saving in buildings
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Buratti, C.; Moretti, E.; Zinzi, M. High Energy-Efficient Windows with Silica Aerogel for Building Refurbishment: Experimental Characterization and Preliminary Simulations in Different Climate Conditions. Buildings 2017, 7, 8.

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