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Modeling and Simulation of Daylight Redirecting Systems

English title Simulation-based assessment of daylight redirecting components for energy savings in office buildings
Applicant Wittkopf Stephen
Number 147053
Funding scheme Project funding (Div. I-III)
Research institution Technik & Architektur Hochschule Luzern
Institution of higher education Lucerne University of Applied Sciences and Arts - HSLU
Main discipline Civil Engineering
Start/End 01.06.2013 - 31.05.2016
Approved amount 534'080.00
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All Disciplines (2)

Discipline
Civil Engineering
Architecture and Social urban science

Keywords (4)

daylight redirection systems; climate based daylight simulation; forward ray tracing; bidirectional scatter distribution function

Lay Summary (German)

Lead
Tageslichtlenksysteme ermöglichen eine optimale Nutzung von Tageslicht in Gebäuden. Sie lenken das Tageslicht von der fensternahen Zone, wo es zu viel ist, in die Tiefe des Raums, wo Bedarf besteht. Daher kann die Blendung reduziert und gleichzeitig Energie für elektrische Beleuchtung eingespart werden. Nur liegen keine verlässlichen Vergleichsdaten vor, mit denen man die Eignung von Tageslichtlenksysteme für verschiedene Gebäude, Ausrichtungen und Klimazonen prüfen und optimieren könnte.
Lay summary

Inhalt und Ziel des Forschungsprojekts

Unser Ziel ist es ein Expertentool zu entwickeln unddamit die Eignung und Optimierung von Tageslichtlenksystemen für verschiedeneKlimazonen zu untersuchen. Dazu müssen neue Modelle entwickelt werden, mitdenen komplexe Oberflächeneigenschaften in einer klimabasierten Tageslichtsimulationhinreichend genau abgebildet werden können.  Man unterscheidet Tageslichtlenksysteme mitkleinen Strukturen, z.B. Mikroprismen, Textilien und Beschichtungen auf Glasoder grösseren Strukturen zu denen Lichtschwerter, hohle Lichtleiter undLamellen gehören. In experimentellen Versuchen werden die Modelle undImplementierungen validiert, bevor abschliessend Leistungsdaten fürverschiedene Tageslichtlenksysteme ermittelt und planerisch dargestellt werden.

Gesellschaftlicher Kontext

Im Zuge der Energiewende müssen vor allem Gebäudeeffizienter mit natürlichen Ressourcen umgehen und gleichzeitig die wachsendenKomfortansprüchen der Nutzer erfüllen. Mit unseren Arbeiten zeigen wir auf, inwelchem Mass dies mit Tageslichtsystemen möglich ist.

 

Direct link to Lay Summary Last update: 18.04.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Climate based daylight simulations with EvalDRC – analysis of Daylight Redirecting Components
Bauer Carsten, Kazanasmaz Zehra Tuğçe, Wittkopf Stephen (2017), Climate based daylight simulations with EvalDRC – analysis of Daylight Redirecting Components, in Journal of Facade Design and Engineering, 5(2), 45-57.
Computational combination of the optical properties of fenestration layers at high directional resolution
Grobe Lars Oliver (2017), Computational combination of the optical properties of fenestration layers at high directional resolution, in Buildings, 7(1), 22.
A hybrid data-driven BSDF model to predict light transmission through complex fenestration systems including high incident directions
Krehel Marek, Grobe Lars Oliver, Wittkopf Stephen (2016), A hybrid data-driven BSDF model to predict light transmission through complex fenestration systems including high incident directions, in Journal of Facade Design and Engineering, 4(3-4), 79-89.
Accordance of Light Scattering from Design and De-Facto Variants of a Daylight Redirecting Component
Noback Andreas, Grobe Lars Oliver, Wittkopf Stephen (2016), Accordance of Light Scattering from Design and De-Facto Variants of a Daylight Redirecting Component, in Buildings, 6(3), 30.
An Out-of-Core Photon Mapping Approach to Daylight Coefficients
Schregle Roland, Grobe Lars Oliver, Wittkopf Stephen (2016), An Out-of-Core Photon Mapping Approach to Daylight Coefficients, in Journal of Building Performance Simulation, 9(6), 620-632.
Annual daylight simulations with EvalDRC – Assessing the performance of daylight redirection components
Bauer Carsten, Wittkopf Stephen (2016), Annual daylight simulations with EvalDRC – Assessing the performance of daylight redirection components, in Journal of Facade Design and Engineering, 3(3-4), 253-272.
Three approaches to optimize optical properties and size of a South-facing window for spatial Daylight Autonomy
Kazanasmaz Tuğçe, Grobe Lars Oliver, Bauer Carsten, Krehel Marek, Wittkopf Stephen (2016), Three approaches to optimize optical properties and size of a South-facing window for spatial Daylight Autonomy, in Building and Environment, 102, 243-256.
A novel data-driven BSDF model to assess the performance of a daylight redirecting ceiling panel at the Calgary Airport Expansion
Grobe Lars Oliver, Müllner Katrin, Meyer Björn (2015), A novel data-driven BSDF model to assess the performance of a daylight redirecting ceiling panel at the Calgary Airport Expansion, in Proceedings PLDC 5th Global Lighting Design Convention, Rome.
Characterisation and modelling of advanced daylight redirection systems with different goniophotometers
Krehel Marek, Kämpf Jérôme, Wittkopf Stephen (2015), Characterisation and modelling of advanced daylight redirection systems with different goniophotometers, in CISBAT 2015 International Conference on Future Buildings and Districts, Vol. 1, LausanneEcole Polytechnique Fédérale de Lausanne, Lausanne.
Comparison of measured and computed BSDF of a daylight redirecting component
Grobe Lars Oliver, Noback Andreas, Wittkopf Stephen, Kazanasmaz Zehra Tuğçe (2015), Comparison of measured and computed BSDF of a daylight redirecting component, in CISBAT 2015 International Conference on Future Buildings and Districts, Vol. 1, LausanneEcole Polytechnique Fédérale de Lausanne, Lausanne.
EvalDRC: A tool for annual characterisation of daylight redirecting components with photon mapping
Schregle Roland, Bauer Carsten, Grobe Lars Oliver, Wittkopf Stephen (2015), EvalDRC: A tool for annual characterisation of daylight redirecting components with photon mapping, in CISBAT 2015 International Conference on Future Buildings and Districts, Vol. 1, LausanneEcole Polytechnique Fédérale de Lausanne, Lausanne.
Progressive Photon Mapping for Daylight Redirecting Components
Schregle Roland, Grobe Lars Oliver, Wittkopf Stephen (2015), Progressive Photon Mapping for Daylight Redirecting Components, in Solar Energy, 114(0), 327-336.
A hybrid data-driven BSDF model to predict light transmission trough complex fenestration systems including high incident directions
Krehel Marek, Grobe Lars Oliver, Wittkopf Stephen, A hybrid data-driven BSDF model to predict light transmission trough complex fenestration systems including high incident directions, in Journal of Facade Design and Engineering.

Collaboration

Group / person Country
Types of collaboration
Alexander von Hoffmann, Technische Hochschule Nürnberg Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Tugçe Kazanasmaz, Faculty of Architecture, Izmir Institute of Technology Turkey (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Exchange of personnel
Katrin Müllner, Transsolar Energietechnik GmbH, Stuttgart Germany (Europe)
- Industry/business/other use-inspired collaboration
Carsten Bauer, Frankfurt Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Exchange of personnel
Björn Meyer, Siteco Beleuchtungstechnik, Traunreut Germany (Europe)
- Industry/business/other use-inspired collaboration
Jean-Louis Scartezzini, LESO EPFL Lausanne Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
David Geisler-Moroder, Bartenbach, Aldrans Austria (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Industry/business/other use-inspired collaboration
Helmut Köster, Köster Lichtplanung, Frankfurt Germany (Europe)
- Industry/business/other use-inspired collaboration
Greg Ward, Lawrence Berkeley National Laboratories United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Exchange of personnel
Özkan Anil Töral, Yasar Üniversitesi, Izmir, Türkei Turkey (Europe)
- Exchange of personnel
Murat Kurt, International Computer Institute, Ege University, Izmir Turkey (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Exchange of personnel
Bruno Bueno, Fraunhofer Institute for Solar Energy Systems ISE Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
15th International Radiance Workshop Talk given at a conference Out-of-Core Photon Mapping: When More Isn't Enough 29.08.2016 Padua, Italy Schregle Roland; Bauer Carsten;
15th International Radiance Workshop Talk given at a conference Comparison of BSDF data generated by a virtual and a real goniophotometer 29.08.2016 Padua, Italy Noback Andreas; Wittkopf Stephen; Grobe Lars Oliver;
15th International Radiance Workshop Talk given at a conference EvalDRC - A new, versatile frontend for climate-based daylight assessment with contribution photon mapping 29.08.2016 Padua, Italy Bauer Carsten;
PLDC 5th Global Lighting Design Convention Talk given at a conference A novel data-driven BSDF model to assess the performance of a daylight redirecting ceiling panel at the Calgary Airport Expansion 28.10.2015 Rome, Italy Grobe Lars Oliver; Wittkopf Stephen;
CISBAT 2015 Talk given at a conference Comparison of measured and computed BSDF of a daylight redirecting component 09.09.2015 Lausanne, Switzerland Noback Andreas; Grobe Lars Oliver; Wittkopf Stephen;
CISBAT 2015 Talk given at a conference EvalDRC: A tool for annual characterisation of daylight redirecting components with photon mapping 09.09.2015 Lausanne, Switzerland Grobe Lars Oliver; Schregle Roland; Wittkopf Stephen;
CISBAT 2015 Talk given at a conference Characterisation and modelling of advanced daylight redirection systems with different goniophotometers 09.09.2015 Lausanne, Switzerland Krehel Marek; Wittkopf Stephen;
Enhanced photon mapping in Radiance: Modelling and simulation of daylight redirecting components Talk given at a conference Enhanced photon mapping in Radiance: Features 29.05.2015 Horw, Switzerland Schregle Roland;
Enhanced photon mapping in Radiance: Modelling and simulation of daylight redirecting components Talk given at a conference Enhanced photon mapping in Radiance: Application for annual daylight assessment 29.05.2015 Horw, Switzerland Noback Andreas;
Enhanced photon mapping in Radiance: Modelling and simulation of daylight redirecting components Talk given at a conference Enhanced photon mapping in Radiance: Modelling of daylight redirecting components 29.05.2015 Horw, Switzerland Grobe Lars Oliver;
13th International Radiance Workshop Talk given at a conference Measurement and modeling of a daylight redirecting component 01.09.2014 London, Great Britain and Northern Ireland Grobe Lars Oliver; Wittkopf Stephen;
13th International Radiance Workshop Talk given at a conference Ongoing Developments in Photon Mapping 01.09.2014 London, Great Britain and Northern Ireland Schregle Roland; Wittkopf Stephen;
Light redirection and scatter: Measurement, modeling, simulation Talk given at a conference The Radiance Photon Map Extension 22.08.2014 Horw, Switzerland Schregle Roland;
Light redirection and scatter: Measurement, modeling, simulation Talk given at a conference Introduction to light scattering and goniophotometry 22.08.2014 Horw, Switzerland Grobe Lars Oliver;
8th Energy Forum "Advanced Building Skins" Talk given at a conference Climate-based daylight simulation as a planning aid for the design of solar façades 06.11.2013 Bressanone, Italy Wittkopf Stephen; Grobe Lars Oliver;


Self-organised

Title Date Place

Knowledge transfer events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
PLDC 5th Global Lighting Design Convention Talk 28.10.2015 Rome, Italy
Tageslichtlenkung - Technik und Modellierung (Workshop Solare Fassaden, Swissbau 2014) Talk 22.01.2014 Basel, Switzerland


Communication with the public

Communication Title Media Place Year
Media relations: print media, online media Aynalı jaluzi sistemleri ile enerji etkin yapı tasarımı: Günışıgı performansının artırılması Ege Mimarlık International 2017
Talks/events/exhibitions Simulationswerkzeuge zur Tageslichtnutzung (Workshop Solare Fassaden, Swissbau 2016) German-speaking Switzerland 2016
Talks/events/exhibitions Tageslichtlenkung - Technik und Modellierung (Workshop Solare Fassaden, Swissbau 2014) German-speaking Switzerland 2014

Associated projects

Number Title Start Funding scheme
179067 Light fields in climate-based daylight modeling for spatio-temporal glare assessment 01.02.2019 Project funding (Div. I-III)

Abstract

1 Summary1.1 Problem StatementTo leverage daylight for building illumination, Daylight Redirecting Components (DRC) are increasingly utilised. They improve illuminance levels in deep building zones. Hence, the energy demand for electrical lighting can be minimised and the physiological advances of daylight exploited. Technological advancements have brought about many different DRC, such as mirror lamellas, glazing with embedded reflecting blinds, laser-cut panels, prisms, holographic-optical elements, glass-fibre cables, light pipes, transparent insulation, compound parabolic concentrators (CPC), sunshade fabrics and others. However, the more complex the components are, the more difficult their planning in buildings becomes. There is little validated data available on the suitability of such components for different daylight conditions - in other words, which DRC yields the highest annual energy savings for a particular location.1.2 ObjectivesComputational simulation will be used to derive the energy savings potential for selected DRC. Annual weather data - available for many locations - and the standard light simulation software Radiance - using performance criteria such as illuminance levels and glare probability - will be the starting point for this research. DRC are grouped into micro- and macrostructured. Microstructured DRC are typically arrays of small elements appearing as one homogeneous structure. Macrostructured DRC consists of one or few larger elements appearing as a non-homogeneous structure. The main challenge with microstructured DRC is the development of models describing their light scattering in Radiance. The main challenge with macrostructured DRC is the integration of a forward tracing algorithm with above software. The development of these models and algorithms, their validation through measurements and application for energy savings will be the core research objectives. The models and resulting energy saving potentials will be published internationally.1.3 Technological RealisationThe BSDF of selected DRC will be measured using goniophotometry. This data will be converted into BSDF models and integrated in Radiance. The DRC will be installed and measured at various locations with different daylight conditions such as Lucerne, London, Dubai, Istanbul and Singapore. The on-site measurements include acquisition of daylight distributions in front and behind the DRC using High Dynamic Range (HDR) photography. The setups will be modelled in Radiance and simulations will be compared to the measurements for validation. Subsequently, climate-based simulations for various DRC and locations will be performed and the resulting hourly values for illuminance levels and glare probability converted into energy savings potential for a typical office layout against a reference clear glazing without DRC. The proposed team has experience and publications in the relevant areas of goniophotometry, on-site measurements with HDR, BSDF modelling and analytical use and extension of Radiance.
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