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Energies 2017, 10(5), 717; doi:10.3390/en10050717

Determination of Equivalent Thermal Conductivity of Window Spacers in Consideration of Condensation Prevention and Energy Saving Performance

1
Department of Architecture, Seoul National University, Seoul 08826, Korea
2
Department of Architectural Engineering, Pukyong National University, Busan 48513, Korea
3
Building Business Unit, Division of Construction, Samsung C&T Corporation, Gyeonggi-do 13530, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: George Kosmadakis
Received: 18 April 2017 / Revised: 15 May 2017 / Accepted: 17 May 2017 / Published: 18 May 2017
View Full-Text   |   Download PDF [13316 KB, uploaded 18 May 2017]   |  

Abstract

This study investigated the impact of thermally improved spacers (TISs) on the condensation prevention and energy saving performances of residential windows. The temperature factor and total U-value were analyzed with the two-box model, by which the TISs are represented with the equivalent thermal conductivity. The results showed that the TISs could increase the temperature factor by up to 12%, and this significantly improved the condensation prevention performance. In addition, it was proved that the TIS enables the prevention of the condensation at an outdoor temperature that is 4.2 °C to 15.7 °C lower compared with the conventional spacer. Also, it was shown that the TISs reduce the total U-value by an amount from 0.07 W/m2K to 0.12 W/m2K, implying that the heat loss through the window is reduced by a rate from 2.8% to 8.2%. In addition, the results of the whole building energy simulation proved that the TISs can reduce the annual heating-energy consumption by a rate from 3.0% to 6.3%. The results were then used for the development of monographs to determine the equivalent thermal conductivity of a window spacer that can meet the performance criteria in terms of condensation prevention and energy saving. View Full-Text
Keywords: thermally improved spacer (TIS); condensation prevention; temperature factor; energy saving; total U-value; monograph thermally improved spacer (TIS); condensation prevention; temperature factor; energy saving; total U-value; monograph
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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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MDPI and ACS Style

Shin, M.-S.; Rhee, K.-N.; Yu, J.-Y.; Jung, G.-J. Determination of Equivalent Thermal Conductivity of Window Spacers in Consideration of Condensation Prevention and Energy Saving Performance. Energies 2017, 10, 717.

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