Abstract
Despite Double skin facade (DSF) buildings are widely deployed worldwide, daylighting strategy is not commonly incorporated in these buildings compare to other strategies. Therefore, further theoretical and experimental studies would lead to adopting daylighting strategy in DSF office buildings. The aim of this study is to investigate the daylighting performance of office building at different design parameters of box window DSF using different glazing types under sub interval of intermediate sky conditions (20-40) klux using the (IES VE) simulation tool from Integrated Environmental Solutions - Virtual Environment. The implemented design parameters are window wall ratio (WWR) of internal facade (10-100) %, cavity depth (CD) of DSF (1-2.5) m and different glazing types. The glazing types were selected from the list available in the (IES VE) simulation tool. After series of evaluations, bronze tinted coating (STOPSOL) is implemented for the exterior facade while clear float, clear reflective coating (STOPSOL), grey and brown tinted coating (Anti-sun float) and blue coating tinted (SUNCOOL float) are implemented for the interior facade. In this paper, several evaluation parameters are used to quantify the optimum design parameters that would balance the daylighting requirements of a box window DSF office versus sky conditions range (20-40) klux. The optimum design parameters of DSF office building obtained under different glazing types are highlighted as follows. When using bronze tinted coating (STOPSOL) for the exterior facade, the glazing types of interior facade that showed superior daylighting performance of DSF office at (CD of 1.0m with WWR of 70%), (CD of 1.5m with WWR of 70%), (CD of 2.0m with WWR of 70%) and (CD of 2.0m with WWR of 70%) are grey tinted coating (Anti-sun float), clear reflective coating (STOPSOL), brown tinted coating (Anti-sun float), and clear float glazing respectively. Blue Coating tinted (SUNCOOL float) of interior facade glazing failed to meet outstanding daylighting performance at any cavity depth.
Highlights
Full glazing façades are widely used for modern architectural projects, commercial buildings, due to their aesthetics and daylight potential
The box window Double skin façade (DSF) office is used for daylighting simulations with cavity depth (CD), adjustable internal façade opening, and different glazing types
The average daylight factor (ADF) and average indoor illuminance inside the office for each DSF model were commonly used in early stages of design to estimate the daylighting characteristics and the required window area
Summary
Full glazing façades are widely used for modern architectural projects, commercial buildings, due to their aesthetics and daylight potential. Single layer glass façades have common weaknesses such as poor thermal insulation and sound reduction index. To overcome these problems, application of DSFs is widely accepted to reduce energy consumption and to improve the sustainability of buildings [1]. At a time when the daylight technology is applied to reduce energy cost in lighting sector, it must be considered some of factors have an impact on daylighting performance such as, location of building, time, climate, size and material of window [4]. Windows are a serious factor in building energy, because thermal energy that is transferred through their transparent surface is crucial, and help to transfer natural daylight deep into building. Improvement of the performance for windows with low thermal transmittance can virtually contribute in reducing energy costs of buildings, and can provide large energy savings [6]
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