High Performing Buildings - Fall 2010 - (Page 28)

All office spaces are 100% daylit, with no electric lights used during working hours. A total of 52 skylights are incorporated into the lighting design. Long Beach, Calif., experienced record rainfall in 2009–10, and the skylights did not leak. By using triple-layer heat stopping acrylic or double-pane low-e glass, the amount of daylight used was maximized while minimizing the amount of heat gain. Even the decorative chandelier in the entry lobby is illuminated by a fiber-optic daylight system with 72 sun-tracking mirrors on the roof. e n e r G y at a G l a n c e Annual Total (site) energy 19 kBtu/ft2 electricity 15.3 kBtu/ft2 natural gas 1.15 kBtu/ft2 renewable energy 2.55 kBtu/ft2 (PV–estimated) Annual source energy 54.5 kBtu/ft2 Annual energy Cost index (eCi) $0.65/ft2 savings vs. standard 90.1-2004 design Building 25% Eight foot by eight foot clerestory monitors wrapped with special UV/ heat rejection film refract low angle daylight while rejecting heat. Northfacing, clear windows electrically open for ventilation and allow occupants direct view of the sky. Key sustainaBle Features occupancy Controls Astronomical time clock provides overall building controls, Crestron controller turns off all lights when building is vacant, lutron ecosystem provides occupancy sensors and daylight sensors for all spaces lighting 100% daylit during working hours, hybrid electrical/daylighting systems Water low-flow fixtures, drought-tolerant landscaping Maximizing daylighting In an office, typical lighting guidelines recommend between 25 and 50 footcandles. High daylight levels coincide with circadian rhythm requirements making open offices places where people want to work. The monitors at Lighting Design Alliance were designed to provide a maximum of more than 400 footcandles of glare-free natural daylight (under full daylighting conditions at midday). The space appears friendly and inviting while promoting worker productivity. The firm plans to track health issues, missed work, and overall office productivity as part of an in-house circadian rhythm study. A frosted acrylic ceiling system illuminated by a clear continuous skylight above spans the entire length of the building from the lobby to the rear exit, forming a bright central corridor. The ceiling provides 100% of the required light for this transition space, even on cloudy days. Color-changing LEDs between the acrylic and the skylight come on after sunset to provide a variety of slowly changing light shows during evening events. The corridor also allows for natural convection to cool the building if the front and back doors are open. The visual terminus of the corridor has a light art sculpture by Stephen fa l l 2 0 1 0 BuildinG enVelope roof Type Wood overall r-value r-38 reflectivity (sri) 88 Acu-shield (acrylic elastomeric coating) Walls Type masonry overall r-value r-20 for conditioned space glazing percentage 6.4% total 5.6% west elevation 2.7% north elevation 0% east elevation 17.2% south elevation Windows u-value 0.34 solar Heat gain Coefficient (sHgC) 0.30 Visual Transmittance 0.8 latitude 33.8073 n electricity use 2009–10 kWh July Aug sept oct nov dec Jan feb march April may June total 7,903 9,514 9,650 9,663 8,750 8,116 7,404 8,361 7,427 6,610 7,702 7,807 98,907 Knapp that only consumes 50 watts of power, but creatively lights most of the wall surface using dichroic glass. The lounge at the end of the corridor has 4 ft by 4 ft clear skylights that house sun-tracking mirrors, which focus high light levels down to the social gathering area below. During an evening event, remote-controlled ceramic metal halide downlights illuminate the same areas. note: net electricity use. gross electricity use includes power generated by photovoltaic panels. 28 HigH Performing Buildings

Table of Contents for the Digital Edition of High Performing Buildings - Fall 2010

High Performing Buildings - Fall 2010
Table of Contents
IDeAs Z2 Design Facility
Lighting Design Alliance
Manassas Park Elementary School and Prekindergarten
FC Gulf Freeway Office Building
Capturing Condensate
National Australian Built Environment Rating System
Tyson Living Learning Center

High Performing Buildings - Fall 2010

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