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Sustainability 2014, 6(10), 7311-7333; doi:10.3390/su6107311

Thermal and Daylighting Performance of Energy-Efficient Windows in Highly Glazed Residential Buildings: Case Study in Korea

1
Department of Architectural Engineering, Gyeongnam National University of Science and Technology, 33 Donjinro, Jinju 660-758, South Korea
2
Department of Architectural Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, South Korea
*
Authors to whom correspondence should be addressed.
Received: 5 August 2014 / Revised: 17 October 2014 / Accepted: 17 October 2014 / Published: 23 October 2014
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Abstract

Cooling load in highly glazed residential building can be excessively large due to uncontrolled solar energy entering the indoor space. This study focuses on the cooling load reduction and changes in the daylighting properties via the application of a double window system (DWS) with shading with various surface reflectivities in highly glazed residential buildings. Evaluation of thermal and daylighting performances is carried out using simulation tools. The reductions in cooling load and energy cost through the use of DWS are evaluated through a comparative simulation considering conventional windows: a single window and a double window. Three variables of window types, natural ventilation, and shading reflectivity are reflected in the study. According to our results, implementation of DWS reduced cooling load by 43%–61%. Electricity cost during the cooling period was reduced by a maximum of 24%. However, a shading device setting that prioritizes effective cooling load reduction can greatly decrease the daylighting factor and luminance level of indoor space. A DWS implementing shading device with highly reflective at all surfaces is appropriate option for the more comfortable thermal and visual environment, while a shading device with low reflectivity at rear of the surface can contribute an additional 4% cooling load reduction. View Full-Text
Keywords: double window system; residential building; cooling load; cooling energy consumption; visual environment double window system; residential building; cooling load; cooling energy consumption; visual environment
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

Cheong, C.H.; Kim, T.; Leigh, S.-B. Thermal and Daylighting Performance of Energy-Efficient Windows in Highly Glazed Residential Buildings: Case Study in Korea. Sustainability 2014, 6, 7311-7333.

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