High Performing Buildings - Fall 2010 - (Page 75)

daniel Hellmuth bringing the total maximum rated power up to 23.1 kW. With these additions, the building is projected to meet the net zero energy target. The data collected so far indicate, as expected, that the LLC is net energy negative (consumes more than it produces) during the colder, darker winter months and is net energy positive during temperate fall and spring months. During the summer of 2009 the LLC was slightly energy negative, but with improvements to the photovoltaic production, building envelope and HVAC operations, the LLC has been energy neutral during summer 2010. energy Challenges High performance buildings are not “plug and play,” and the importance of building siting, predictive energy modeling, building envelope optimization, performance monitoring and commissioning increases with the level of performance. Similarly, all buildings have trade-offs, and tradeoffs that might go unnoticed in conventional buildings become critical in high performance buildings. In this case, planning and construction had to be completed in seven months, a schedule complicated by winter weather. Budget constraints prompted an aggressive value engineering review, which ralph Bicknese Above This dual-axis solar tracking panel moves with the sun throughout the day and returns to its original position at night. The roof PV panels were not sufficient to meet the building’s power needs, so two highly efficient solar-tracking panels were added. Left Photovoltaic panels are secured to the south roof using clips, creating a modular installation process. The standing seam galvanized aluminum roof provides ventilation beneath the panels. aimed to reduce costs while preserving the program requirements and Living Building Challenge requirements. In December 2009, performance monitoring of the LLC indicated that energy consumption was going to be 25% to 35% above energy model predictions. Items such as high infiltration, HVAC inefficiencies stemming from an operation schedule that did not match occupant building use, and lower than planned building envelope insulation livinG BuilDinG CHallenGe eleCtriCity ConSumPtion, ProDuCtion June 2009–June 2010 electricity Consumption kWh June July Aug. sept. oct. nov. dec. Jan. feb. march April may June total 1,602 2,387 2,040 958 920 1,238 3,949 1,617 2,377 2,152 610 1,103 2,553 23,506 PV (max. rated power) kW 17.2 17.2 17.2 17.2 20.3 20.3 20.3 20.3 20.3 20.3 20.3 23.1 23.1 electricity Production kWh 1,012 1,830 1,810 1,612 1,114 1,311 780 967 1,209 1,887 2,202 2,300 2,689 20,723 Surplus (Deficit) kwh (590) (557) (230) 654 194 73 (3169) (650) (1168) (265) 1592 1197 136 (2193) fa l l 2 0 1 0 HigH This performance-based green building certification was developed by Jason mcClelland and the Cascadia green Building Council, and is now managed by the international living Building institute. The living Building Challenge (lBC) sets one of the highest known bars for sustainability and poses the challenge “what if we build a building that produces its own power and water, is climate-neutral, supports local, regional, nontoxic materials and is both beautiful and inspirational.” The lBC is comprised of seven performance areas (site, water, energy, health, materials, equity and beauty) with a total of 20 imperatives. The Tyson living learning Center is one of the first completed registered projects in the world and is pending certification. for more information, see http://ilbi.org/the-standard/version-2-0. Performing Buildings 75 http://www.ilbi.org/the-standard/version-2-0

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