Publications by Stephen Wittkopf

Performance of Anidolic Daylighting Systems in tropical climates – Parametric studies for identification of main influencing factors

Jean-Louis Scartezzini, Friedrich Linhart, Stephen Wittkopf

Making daylight more available in buildings is highly desirable, not only for reasons of energy-efficiency, but also for improvement of occupants’ health and well-being. Core-daylighting, that is daylight provision in areas situated at considerable distanc ...

Elsevier2010

Ray tracing study for non-imaging daylight collectors

Jean-Louis Scartezzini, Jérôme Henri Kämpf, Friedrich Linhart, Stephen Wittkopf, Raphaël Compagnon, Lars Oliver Grobe

This paper presents a novel method to study how well non-imaging daylight collectors pipe diffuse daylight into long horizontal funnels for illuminating deep buildings. Forward ray tracing is used to derive luminous intensity distributions curves (LIDC) of ...

2010

High Performance Integrated Lighting Systems: Recent Achievements within the Framework of the "Green Lighting" project

Jean-Louis Scartezzini, Friedrich Linhart, Stephen Wittkopf

The „Green Lighting“ project (LESO-PB/EPFL and Swiss Federal Office of Energy) explores different ways to combine advanced day- and artificial lighting technologies for achieving highly energy-efficient office lighting scenarios. This communication gives a ...

EPFL2009

Recent Research on Anidolic Daylighting Systems: Highly Reflective Coating Materials and Chronobiological Properties

Jean-Louis Scartezzini, Mirjam Münch, Friedrich Linhart, Stephen Wittkopf

Making daylight more available in buildings is highly desirable for reasons of energy efficiency, visual comfort, occupant well-being and health. The Anidolic Integrated Ceiling (AIC) is a highly efficient daylighting system, designed to gather and redirec ...

2009