A validation of a ray-tracing tool used to generate bi-directional scattering distribution functions for complex fenestration systems

McNeil, Andrew; Jönsson, C.; Appelfeld, David; Ward, Greg; Lee, Eleanor S.

doi:10.1016/j.solener.2013.09.032

Cited by 90 publications

(25 citation statements)

References 16 publications

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“…EvalDRC (Evaluate Daylight Redirection Components) is a software to run annual daylight simulations based on Radiance daylight coefficient calculation with Enhanced Photon Mapping [43,44]. The inputs are Tregenza sky model for the hemispherical sky radiance distributions, Perez sky model with actual climate data for sky/sun patch radiances, a Radiance scene including geometry of the room, micro-prism film, sensor points, and processing parameters including time, location, metric boundary values and Enhanced Photon Mapping and renderings etc.…”

Section: Setup Of Simulation Environment Using Evaldrcmentioning

confidence: 99%

Three approaches to optimize optical properties and size of a South-facing window for spatial Daylight Autonomy

Kazanasmaz

Grobe

Bauer

et al. 2016

Building and Environment

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a b s t r a c tThis study presents optimization approaches by a recent Climate-Based-Daylight-Modeling tool, EvalDRC, to figure out the necessary area for a daylight redirecting micro-prism film (MPF) while minimizing the glazing area. The performance of a window in terms of spatial Daylight Autonomy (sDA) is optimized by its geometry and optical properties. Data implemented in simulation model are gathered through on-site measurements and Bidirectional-Scattering Distribution Function (BSDF) goniomeasurements. EvalDRC based on Radiance with a data driven model of the films' BSDF evaluates the window configurations in the whole year. The case to achieve an sDA of at least 75% is a South-facing window of a classroom in Switzerland. A window zone from 0.90 m to 1.80 m height provides view to the outside. The upper zone from 1.80 m to 3.60 m is divided into six areas of 0.30 m height in three optimization approaches including the operation of sunshades as well. First, the size of the clear glazing is incrementally reduced to find the smallest acceptable window-to-wall ratio (WWR). Second, microprism films are applied to an incrementally varying fraction the initial glazed area to determine the minimum film-to-window ratio (FWR). Finally, both approaches are combined for a minimum FWR and WWR. With clear glazing and WWR of 75%, the sDA of 70.2% fails to meet the requirements. An sDA of 86.4% and 80.8% can be achieved with WWR 75%, FWR 1/9 and WWR 50%, FWR 1/2 respectively. The results demonstrate the films' potential to improve the performance of windows with reduced WWR.

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Section: Setup Of Simulation Environment Using Evaldrcmentioning

confidence: 99%

Three approaches to optimize optical properties and size of a South-facing window for spatial Daylight Autonomy

Kazanasmaz

Grobe

Bauer

et al. 2016

Building and Environment

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“…A model of the MSPSS was created using detailed geometric drawings from the manufacturer and reflectance measurements of an unperforated sample also provided by the manufacturer. Radiance's program genBSDF was used to generate a BSDF matrix [10]. The genBSDF program generates blocks of values which describe 145 Klem's incidence angles for one of 145 oppositely placed outgoing directions [11].…”

Section: Bsdf Generation Via Simulationmentioning

confidence: 99%

An hourly based performance comparison of an integrated micro-structural perforated shading screen with standard shading systems

Appelfeld

McNeil

Svendsen

2012

Energy and Buildings

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TitleAn hourly-based performance comparison of an integrated micro-structural perforated shading screen with standard shading systems This article evaluates the performance of an integrated micro structural perforated shading screen (MSPSS). Such a system maintains a visual connection with the outdoors while imitating the shading functionality of a venetian blind. Building energy consumption is strongly influenced by the solar gains and heat transfer through the transparent parts of the fenestration systems. MSPSS is angular-dependent shading device that provides an effective strategy in the control of daylight, solar gains and overheating through windows. The study focuses on using direct experimental methods to determine bi-directional transmittance properties of shading systems that are not included as standard shading options in readily available building performance simulation tools. The impact on the indoor environment, particularly temperature and daylight were investigated and compared to three other static complex fenestration systems. The bi-directional description of the systems was used throughout the article. The simulations were validated against outdoor measurements of solar and light transmittance.

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“…Sky mixing methods interpolate values under a range of skies from clear to overcast for different points in time in a year. Support for the simulation of CFS and dynamic shading in form of three-phase and five-phase methods that use Bidirectional Scattering Distribution Function (BSDF) xml file [107] has also been implemented and validated recently [108] [109]. Nevertheless, due to the computational time needed to calculate all of the points in time steps during the whole year, these methods implement point grids to collect illuminance data.…”

Section: Types Of Simulations/analysesmentioning

confidence: 99%

State-of-the-art review of solar design tools and methods for assessing daylighting and solar potential for building-integrated photovoltaics

Jakica

2018

Renewable and Sustainable Energy Reviews

129

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Solar design can take many different forms across disciplines with different methodologies and goals, ranging from acquiring architectural visual effects to assessing illumination for daylighting and solar radiation potential on building surfaces for PV implementation. Furthermore, a capability of solar design methodologies and tools to accurately and time efficiently simulate light phenomena can greatly influence performance results and design decisions. This is especially important in complex cases such as dense urban settings with the significant surface shadowing, and vertical facades including daylighting devices and photovoltaics. Consequently, choosing a suitable approach and tool for each design phase is essential for achieving unique design and performance goals. This paper was carried out within the framework of IEA-PVPS Task 15 -BIPV and it aims to facilitate this decision for all parties involved in solar design process. Here presented, is an overview of almost 200 solar design tools, analyzing their numerous features regarding accuracy, complexity, scale, computation speed, representation as well as building design process integration in about 50 2D/3D, CAD/CAM and BIM software environments. Furthermore, tools from various fields have been analysed in a broad interdisciplinary context of solar design with a particular attention for being used for Daylighting and Building-Integrated Photovoltaics (BIPV) purposes. This approach should open many new perspectives on a potentially wider multidisciplinary usage and interpretation of solar design tools, sometimes well beyond their initial scope of work.

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A validation of a ray-tracing tool used to generate bi-directional scattering distribution functions for complex fenestration systems

Cited by 90 publications

References 16 publications

Three approaches to optimize optical properties and size of a South-facing window for spatial Daylight Autonomy

Three approaches to optimize optical properties and size of a South-facing window for spatial Daylight Autonomy

An hourly based performance comparison of an integrated micro-structural perforated shading screen with standard shading systems

State-of-the-art review of solar design tools and methods for assessing daylighting and solar potential for building-integrated photovoltaics

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