High Performing Buildings - Fall 2010 - (Page 39)

the principal bioretention area also serves as a partially shaded outdoor classroom and performance stage. Students queue on the benches while waiting to be picked up. Intentionally carved out at a campus low spot, the outdoor classroom and adjacent biofiltration area can accommodate a 100year storm event before slowly releasing the excess water downstream. the stepped terraces register the relative scale of storms as the water rises. Prakash Patel and Vmdo Architects daylighting the design team optimized daylighting strategies using ecotect software and physical daylighting models. In the gymnasium, alternative studies indicated that an array of tubular skylights would most effectively provide uniform glare-free lighting required without causing significant heat gain. In the prekindergarten building, north-facing monitors were planned from the earliest phases. Daylighting studies helped the team to determine the requisite monitor size, shape, and throat configuration. Daylight floods each classroom. continuous glazing at MPes from 3 ft above the finished floor to the 11 ft ceilings allows children to see out and creates a transparent environment. In south-facing classrooms, exterior sunshades block direct sunrays, while clerestory parabolic light louvers redirect sunlight to the ceiling. acoustical ceilings also slope to reflect more ambient light while absorbing more noise than a flat ceiling. the result is a glare-free teaching wall with no artificial light. When lights are needed, three rows of pendant fluorescent fixtures (each with its own photosensor) automatically dim to adjust to changing exterior light conditions. Motion sensors automatically turn lights off after five minutes and occupants must tap a switch to turn them fa l l 2 0 1 0 HigH on. each row of pendant lights has four lamps, but only two of the four come on with the press of a button. the user must press a second button to turn on all of the lamps, although this is rarely needed. add in the benefits of Bascontrolled light switching, and the total power required for interior and exterior lighting is significantly below standard 90.1-2004 requirements (38% and 54% less, respectively). e n e r g y at a g l a n C e energy use intensity (site) 37.28 kBtu/ft2 natural gas 8.11 kBtu/ft2 electricity 29.17 kBtu/ft2 Annual source energy 106 kBtu/ft2 Annual energy Cost index (eCi) $1.14/ft2 savings vs. standard 90.1-2004 design Building 35.5% energY sTAr rating 80 Performing Buildings 39

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