Description: |
This session gives the participant three succinct "how tos" on daylighting. 1.) Edward Dean's presentation will provide a thorough discussion of how to use daylighting in the architectural design of building spaces to provide specific functional lighting requirements, create visual interest, and generally to create a sense of overall spatial beauty. Technical aspects of daylight and the illumination of space will be thoroughly covered, in addition to the specific geometric relationships and material characteristics of the space and opening features in order to create the desired effects. The three requirements for good daylighting will be discussed and illustrated, namely sun control, glare control and variability control. Examples of space design applications using each of the daylighting solution “patterns” will be provided through illustrations.
Attendees at this session need not have any previous experience or knowledge of LEED. The target audience is more likely to be composed of architects, interior designers and building designers, rather than engineers. At this session, the attendees will learn:
•The significance and importance of daylighting in reducing energy use and peak power demand of electricity;
•Specific design techniques and space features for replacing normally electric-source lighting with daylight-source lighting and how to provide a high quality lighting design;
•A familiarity through examples of how good daylight design is at the core of great space design. 2.)John An will discuss daylighting as a sustainability strategy for creating high-quality indoor environments while simultaneously reducing building energy use. However, glare is an especially important consideration in daylight design. “If not controlled properly, [] daylight can produce unwanted glare and affect the lighting quality” (USGBC 2005). Currently available methods for evaluating glare are very specific, and thus have limited usefulness in evaluating the overall risk for glare in a space over the course of a year.
There exist established design strategies, such as installing blinds and shades, to control glare. Likewise, there are simulation methods to identify glare problems for individual views at specific times of the year. While these existing methods are helpful in assessing potential glare risk under specific conditions, they have limited usefulness in determining the potential for glare in a space over extended periods of time. A more general approach for assessing the probability of glare problems over the course of a year would be more useful in the design process, since specific views and exact times of the year for analysis are often not clearly defined.
This presentation proposes a computer simulation method for assessing the Annual Glare Potential (AnGP) in an interior space without the requirement of defining a particular view and a specific time.
The AnGP method evaluates, for a sample of yearly sun positions and sky conditions, the luminance contrast ratio (LCR) between a work surface and individual grid-points on the wall and ceiling surfaces in a space. The ratio between the LCR’s that are above an established threshold and the total number of LCR’s evaluated is the AnGP.
The application of the AnGP method in current projects will be presented to demonstrate its implementation, results, and potential usefulness not only in the design process, but also in green building rating systems. 3.) Zach Rogers will discuss the dynamic nature of daylight poses many challenges when considering metrics that define good and effective daylighting design. Hence, dynamic metrics rather than static metrics can better quantify “good” daylighting. Several broader methodologies have been developed for quantifying the many facets involved in good daylighting design, some of which have been implemented in the California Collaborative for High Performance Schools (CHPS) program. In conjunction, a user friendly software tool, the Sensor Placement and Optimization Tool (SPOT), has been developed to provide the complex calculations that are inherent to any metric for such a dynamic design element.
This talk will present research on several dynamic metrics compared to current static metrics, discussing the intricacies of quantifying such a complex resource such as daylight. It will present a software tool that has been developed for implementing these new metrics. The talk will then give an overview of the implementation of these metrics in the California CHPS program and successes seen and lessons learned. The final 30 minutes will be opened up as an interactive discussion panel regarding current daylighting metrics and the needs for improved metrics.
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