Energy efficiency in architecture is a growing necessity. An integrated design approach should be considered in facade design in an effort to balance various counterweight demands, achieving both well-being and productivity, as well as a reduction in overall energy consumption and peak loads. This fact revived the popularity on daylight use through a creation of a variety of innovative design techniques, façade systems and control strategies for the artificial lighting. The controversy over the minimum percentage of openings in ASHRAE 90.1 is recent, a controversy also called “The battle for the wall”. New terms have begun to be used such as “circadian architecture” and “vistaphilia” demonstrating the need to find a common ground for the artificial lighting design practice that focuses on the use of technology with the architectural approach, whose concern should be -among others- to ensure natural lighting and views. The presentation explores the design practices related to the properties of the facade, space and lighting control system, correlating them with the energy balance of the building while satisfying the requirements of the new European daylight standard.


Aris Τsangrassoulis is a Professor in Low Energy Builiding Design at the Dept. of Architecture, University of Thessaly. His research activity focuses on low energy building design, daylighting/shading, the development of techniques for achieving  lighting energy savings and  the impact of building  design and operation on  thermal/visual comfort. He currently runs the Lab. of Sustainable Design of Building Structures, which is involved in national/international research projects while  it supports consultancy work in simulation assisted low energy building design and daylighting/lighting  design.