Optimisation of daylight and artificial light in cultural heritage Hauptschule Hötting in Innsbruck, Austria (3ENCULT Case Study 5) Rainer Pfluger, Matthias Werner, Wolfgang Feist Faculty of Civil Engineering, Unit Energy Efficient Buildings University of Innsbruck e-mail: rainer.pfluger@uibk.ac.at ABSTRACT Within the FP7 project “3ENCULT – Efficient Energy for EU Cultural Heritage”, the school building “Höttinger Hauptschule” in Innsbruck (Austria) is one of the 8 case studies for demonstration and verification of energy efficient solutions. Besides the reduction of thermal losses, a special focus will be on the optimisation of daylighting and energy efficient artificial lighting with high priority of conservation-compatibility for all of the interventions. New software for visualization (VIVALDI by Zumtobel) is used. The principle behind it is to evaluate the luminance of interesting areas of calibrated HDR (High Dynamic Range Image) photos taken of rooms with prototypically installed systems. As the electric consumption of the artificial light is well known, the saving potentials of different lighting solutions can be evaluated. KEYWORDS Artificial light, day light, energy efficiency, simulation software, visualisation tools, school building, cultural heritage, DESCRIPTION OF THE CASE STUDY The Secondary School Hötting (Fürstenweg, Innsbruck, Austria) is one of the 8 case studies for demonstration and verification of energy efficient solutions within the European research project 3ENCULT (Efficient Energy for EU Cultural Heritage). It is listed as one of the most important examples of early modern architecture in Tyrol. In connection with the reformation of the school system and the introduction of the “Hauptschule“ at the end of the 1920`s, new types of schools started to be planned. These new types of school were planned to meet modern criteria such as ventilation, illumination and sun light influx. For the new school at Hötting, a public tender was held and won by a group of architects around Franz Baumann and Theodor Prachensky at the end of 1928.They were assigned the contract to do the planning which started in fall 1930. Construction itself was undertaken by Retter, a construction contractor and the school opened on the 25th of October in 1931. The Hauptschule Hötting is a perfect example for the general development of architectural culture under the principles of the “New Objectivity” [1] . The building is still in use as a “Hauptschule” and has recently become a “Neue Mittelschule”.