Launch Slideshow

Tenley-Friendship Library

Tenley-Friendship Library

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    A view of the building entrance at night.

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    A view of the main corridor with reading and stack areas to the right.

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    The children’s library area. T5 fluorescents are integrated into the structural support members and indirectly illuminate the ceiling without any socket shadows.

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    A view of the reading and stack area.

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    Copper-colored exterior vertical fins help to modulate the amount of natural light entering the interior.

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    Cantilevered T5 stacklights provide vertical illumination all the way down to the bottom shelf. Seventy percent of the lights are typically dimmed or turned off during the day due to the amount of available natural light.

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    An exterior view of the building.

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    The library entrance.

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    Daylight control zones in the upper reading rooms relate to daylight contributions from the façade and the atrium.

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    The main floor of the library.

 

The Tenley-Friendship Library, part of the DC Public Library system, was designed inside-out by way of a collaborative process. The Freelon Group and Horton Lees Brogdon Lighting Design worked together to develop architectural, electric lighting, and daylighting systems with an eye toward creating a healthy building that consumes 31 percent less energy than is standard for a 21,472-square-foot structure. The project focuses on connecting visitors to the community with exterior views that bring the diurnal cycles of light inside the library. The design team conducted extensive sun angle studies to develop a system of external vertical fins that protect the otherwise transparent insulated glass enclosure, allowing controlled daylight to filter into the interior while cutting down on heat gain. The central circulation spine also makes ample use of natural light with a glass roof that directs sunlight onto an interior feature wall of the same copper color as the external fins. The daylighting scheme is supplemented with T5 fluorescent fixtures set on photo-activated dimmers. The T5s are set in coves to maintain a constant level of light, day or night. In the stacks, the T5s are integrated with the flange of the exposed-steel structural members, where they uplight the ceiling. The stacks themselves feature T5s in cantilevered fixtures that provide focused downlighting to the bottom shelf.

During most days, the daylighting is sufficient to keep 70 percent of the electric lights dimmed all the way down, a factor that contributed to the project's LEED Gold certification.

Jury Comments: A complete examination of how light and architecture can work in unison. • Love the way the vertical fins are turned into an architectural feature, while still serving as a principal lighting device. • Excellent use of daylighting.