Engineering Doctorate

Ziezo Research Project

Technische Universiteit Eindhoven – Netherlands

Ziezo is an insulated glazing unit, that integrates bifacial photovoltaic solar cells with solar shading. It is a window system that integrates solar shading with bifacial photovoltaic cells within the glazing unit. Ziezo concept was previously conceived by a consortium of partners: TNO, Pilkington, Eindhoven University of Technology, and W/E Adviseurs. As a proof of concept, Ziezo has been translated and manufactured to two prototypes: 1) smaller size of 46.5×40 cm at the research facility of SolarBEAT at Eindhoven University of Technology, and 2) real-scale sizes that were installed at the headquarter office of Pilkington at Enschede. The prototypes were installed in the two Dutch cities of Eindhoven and Enschede to begin testing their electrical performance. The key challenge of Ziezo in this project was that these prototypes have been designed as a concept based on rules-of-thumb, and developed yet without modeling for its performance. The project is supported by Topsector Energy of the Dutch Ministry of Economic Affairs. The work which was presented in Daylight Academy conference at Trondheim in 2024, and Sustainability Day exposition at TU Eindhoven.

3D Interactive BSDF

3D Interactive BSDF
Parametric modeling of Klems sky model
spectrum of daylight through Ziezo window

validation of BSDF with raytracing model

dialogue between solar cells and venetian blinds

daylight modeling and simulation using three-phase method

development of Ziezo tool to evaluate daylight and energy performance [Ziezo Tool Demonstration ]

developing six situations for light raytracing forward and backward

actual measurement of light in a physical model office room

qualitative lighting analysis

measuring daylight using four spectrometer sensors