Daylighting At Stonyfield
By Marc Rosenbaum and Bruce Coldham
See Also: Notes on Constructing a Daylighting Model
Introduction
This paper reports the results of a comparison of skylights vs. south-facing roof monitors for daylighting the north wall zone of a 10,000 square foot office building near Manchester, NH. This effort was part of ARC Design Group's (John Abrams, Marc Rosenbaum, PE, Bruce Coldham) integrated approach to design which seeks to create high quality human environments through excellence in ecological design. The office space is being retrofitted into an existing steel framed, 18 foot high warehouse, with a party wall to an industrial facility on the north side; therefore, no daylight is available through the north wall. A design goal was to have the interior daylit on overcast as well as clear sky days because, in the NH climate, the sky is overcast 50% of the year — a goal intended to enhance the interior working environment more than to save electrical energy. Specifically, we aimed to achieve at least 20 footcandles (fc) at the workplane with 1,500 fc of exterior ambient daylight. Since the south wall is sixty feet from the north wall, it was clear that some form of toplighting would be required to achieve this throughout the interior space.
To test toplighting strategies, a physical model was constructed and tested. Simultaneously, the building's annual thermal performance was modeled with Energy-10 hourly simulation software, and its peak heating and cooling load performance was modeled with the Carrier Corp. Hourly Analysis Program (HAP).
The zone being tested consists of a bank of offices adjacent to the north wall. Each office has a transparent ceiling at about 10 feet. The high roof ensures that no direct beam light can reach the office workplanes — most of the light delivered is ...
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Daylighting
Notes on Constructing a Daylighting Model
Daylighting At Stonyfield