Performance analysis of light shelves in providing visual and thermal comfort and energy savings in residential building
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(2020) 42:484
TECHNICAL PAPER
Performance analysis of light shelves in providing visual and thermal comfort and energy savings in residential buildings Amir Ebrahimi‑Moghadam1 · Paria Ildarabadi2 · Karim Aliakbari3 · Ahmad Arabkoohsar4 · Faramarz Fadaee2 Received: 25 January 2020 / Accepted: 12 August 2020 © The Brazilian Society of Mechanical Sciences and Engineering 2020
Abstract Using light shelves (LSs) is one of the passive-enhancement methods for energy saving and providing better thermal comfort conditions of the building users. The goal of this research is to create a consistent daylight environment that improves the visual and thermal comfort of users in buildings. Comfort effects on the four fronts of a building (in the Pars residential complex of Mashhad city in Iran as a case study) are investigated. Five types of LSs are suggested for improving the building’s thermal and visual conditions. Then, the illuminance analysis is performed for the building with and without the LSs. Horizontal and vertical LSs are considered in building to enhance visual quality and uniformity of daylight in the building space. According to the highest and lowest light intensity in the investigated spaces, the LS that provides optimal visual conditions for space is selected. Then, the role of optimum LS in thermal comfort and energy indicators (heating, cooling, and electricity) has been investigated and compared with the base situation. Analyzing the results reveals that using the optimal LS causes an annual average improvement of 18%, 11%, and 7% in the demand for heating, cooling, and electricity, respectively, of the building throughout the year. Keywords Passive-enhancement method · Light shelf · Visual comfort · Thermal comfort · Energy consumption
1 Introduction
Technical Editor: Jose A. R. Parise. This article has been selected for a Topical Issue of this journal on Nanoparticles and Passive-Enhancement Methods in Energy. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s40430-020-02565-2) contains supplementary material, which is available to authorized users. * Amir Ebrahimi‑Moghadam [email protected] * Paria Ildarabadi [email protected] 1
Young Researchers and Elite Club, Mashhad Branch, Islamic Azad University, Mashhad, Iran
2
Khorasan Institute of Higher Education, Mashhad, Iran
3
Department of Mechanical Engineering, Faculty of Montazeri, Khorasan Razavi Branch, Technical and Vocational University (TVU), Mashhad, Iran
4
Department of Energy Technology, Aalborg University, Esbjerg, Denmark
In recent years, much effort has been devoted to achieving a zero-energy supply pattern, including electricity, daylight, and heat, for buildings [1, 2]. The combination of different passive-enhancement architecture strategies with energy principles has attracted the attention of many researchers in the field of energy savings in buildings [3, 4]. In order to achieve a dynamic and desirable situation, climate considerations are
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