In the first period of its activities, LIPID conducted research on other research areas. These include the development and evaluation of advanced façade designs and high-performance envelops with regards to energy loads, human comfort and overall occupant acceptance.
With the ever-growing variety of innovative façade technologies, finding ways to better connect the design and industry fields is becoming a necessity. A new approach was developed as an interactive search and selection platform to address this need, focusing on the designer’s perspective, available www.d-lite.org.
It is very challenging to obtain a trade-off between solar protection, appropriate daylighting and occupant visual comfort. Different passive technologies are being investigated such as the Soralux Daylighting System, a passive louver unit that requires no shading adjustments and works well with deep-plan spaces. Others rely on passive actuators, adaptively reacting to direct solar radiation, combined with robust skin designs for arid climates with unique dayligthing, optical and aesthetic features. Along those lines, we currently investigate designs of solar thermal concentrator based on an innovative self-adaptive design that avoids complex tracking mechanisms.
LIPID has substantial expertise in the experimental assessment of the so-called Bidirectional Transmission Distribution Functions (BTDFs), including pioneering designs of parallel goniophotometers, i.e. instruments that allow dramatic reductions in measurement time compared to their step-by-step scanning counterparts. We are currently investigating limitations of these new instruments as well as design rules ensuring robustness. Because raw BTDF data lack comprehensiveness and intuitiveness, a new set of performance metrics is being developed in parallel for describing important key features of a complex window system, such as energy efficiency, occupant visual comfort, and view.
Related projects, publications and links
The Database of Light-Interacting Technologies for Envelopes (D-LITE) intends to provide the missing link between building designers and technology manufacturers through an interactive technology search and selection website (www.d-lite.org), that may ultimately be a reference repository. More information can be found in a PLEA conference paper and an excerpt of its initial concept.
Informing well-balanced daylighting design using Lightsolve
Lightsolve is a simulation platform for daylighting design that offers a goal-based approach with a simultaneous visualization of quantitative and qualitative information (see video). It can be downloaded and tested in its current development stage using the tutorial but will undergo a major reconfiguration in the coming year. More information can be found in over 15 related publications
An interactive performance-based expert system for daylighting design
Lightsolve also includes an interactive expert system to support a guided search process for façade configuration solutions in the early stages of design. Findings were discussed in international conference events and several papers were published on its development by Prof. Andersen and PhD student Jaime Lee Gagne, one of which was awarded the PLEA best paper award.
Design rules for robust catadioptric goniophotometers
A detailed investigation of catadioptric parallel goniophotometers revealed fundamental limitations inherent to these devices, in particular for those incorporating fisheye optics like the so-called Heliodome instrument. Further investigation resulted in requirements for the design of catadioptric parallel goniophotometer free of measurement artefacts. The outcome of this research is being published in several proceedings and journal papers.
Expressing performance for complex façade technologies
The performance and potential benefits of highly directional technologies for lighting are difficult to grasp intuitively. New metrics are being developed to express these more concisely, described in two conference papers (PLEA paper and CISBAT paper). In a collaboration with Saint-Gobain Research, a climate-based integrative approach was applied to compare the impact of different ceiling tile choices.
Innovations in deep-plan daylighting
The Soralux daylighting system, developed through a research project sponsored by HULIC in Japan, will be permanently installed on 7 of the 10 floors of the future HULIC Head Office building in Tokyo. A patent has been filed for this invention, that has been featured in the popular press. More information can be found in the PLEA conference paper and Kevin Thuot’s MSc thesis.
Video-based techniques for assessing optical and lighting properties
Two generations of goniophotometers have been developed under Prof. Andersen’s leadership, first as her PhD thesis using digital imaging and a projection screen – which led to over fifteen journal and conference papers. Then as a second embodiment as the Heliodome using a mirrored ellipsoid and fisheye optics, that led to over ten additional publications and theses.