High Performing Buildings - Winter 2013 - (Page 41)

EnErgy USE Mechanical Equipment (kWh) May-11 Jun-11 Jul-11 aug-11 Sep-11 Oct-11 Nov-11 Dec-11 Jan-12 Feb-12 Mar-12 apr-12 Total 2,105 903 987 1,620 1,372 2,143 2,959 3,434 3,611 3,081 3,163 2,276 27,654 lighting/ plug loads (kWh) 1,173 986 778 863 1,227 1,309 1,294 1,333 1,275 1,331 1,315 1,273 14,157 M ay 2 0 1 1 – a p r i l 2 0 1 2 Total power Consumption (kWh) 3,278 1,889 1,765 2,483 2,599 3,452 4,253 4,767 4,886 4,412 4,478 3,549 41,811 Net power pV Energy Consumption/ production production (kWh) (kWh) Opsis architects 5,247 5,651 5,750 5,814 4,248 2,305 1,651 1,237 1,131 2,065 3,034 4,235 42,368 -–1,969 -–3,762 -–3,985 -–3,331 -–1,649 1,147 2,602 3,530 3,755 2,347 1,445 – 686 -–557 Mixing classroom lessons with hands-on learning in the garden and greenhouse helps engage students in their classes. A system combining operable low and high clerestory windows and rooftop ventilators provides fresh air and passive cooling to facilitate cross and stack ventilation. A red light/green light indicator informs building occupants when outside temperatures are favorable for natural ventilation, further engaging students in the management of the building’s energy use. The system also passively preheats the air used for mechanical ventilation in a transpired solar collector, or air plenum that sits on a south-facing roof covered by a piece of perforated metal decking and solar panels. Not only does this system conserve energy by using passively heated air, but when hot air is drawn out of the plenum for use in the building, it cools the solar panels that sit above the plenum, allowing them to run more efficiently. Deciduous vine-covered trellises sit in front of south facing windows to block summer sun, but allow solar heat gain during the winter. The team placed a sundial above the south entry to raise the students’ awareness of daily and seasonal natural cycles and help provide a connection between the building and its place. water is simply diverted through a heat exchanger during periods of cooling demand. The floor slab for radiant heating and cooling distributes energy from these sources throughout the building. Heat recovery ventilators transfer heat from exhaust to incoming air, and use the transpired solar collector to preheat air. CO2 sensors regulate the amount of fresh air needed to be brought into the building, while a BUiLding EnvELopE roof Type rigid board insulation over wood decking Overall r-value 40 reflectivity 15% Walls Type insulated concrete forms (iCF) Overall r-value 25 Glazing percentage 29% Basement/Foundation Slab Edge insulation r-value r-15 Continuous Under Slab insulation r-value r-15 Windows Effective U-factor for assembly 0.3 Solar Heat Gain Coefficient (SHGC) 0.3 Visual Transmittance 0.38 Location latitude 45.7° N Orientation long axis of greenhouse runs E-W; long axis of building runs N-S. Active Mechanical and Electrical Systems The building’s main source of heating and cooling energy is through a geoexchange system of tubing that is horizontally looped 10 ft under the school’s soccer field. An adjacent stream serves as an additional energy source for summer cooling. The district uses a portion of the stream’s snowmelt runoff for irrigation at the school during the region’s dry summers, which coincides with the need for cooling. The irrigation Winter 2013 HigH Performing Buildings 41

Table of Contents for the Digital Edition of High Performing Buildings - Winter 2013

High Performing Buildings - Winter 2013
Commentary
Contents
Kensington High School for the Creative and Performing Arts
Mercy Corps World Headquarters
Hood River Middle School Music and Science Building
UC Davis Health and Wellness Center
Gateway West Sustainable I
Technologies on Display
Advertisers Index

High Performing Buildings - Winter 2013