High Performing Buildings - Summer 2009 - (Page 32)

M O N T H LY E N E R G Y U S E , J U N E 2 0 0 7 — M A Y 2 0 0 8 Electricity Data (kWh) June July August September October November December January February March April May Total 959,945 985,165 1,031,078 850,178 904,535 954,953 924,500 1,021,608 953,578 987,292 947,067 945,825 11,465,724 kWh Gas (therms) 388 134 0 26 772 6,458 13,948 17,645 12,950 11,698 5,305 1,180 70,502 therms Peak Electric* (W/ft2) 3.13 3.45 3.04 3.01 2.88 2.60 2.64 2.77 3.12 2.83 3.06 3.32 3.45 W/ft2 Peak drainage layers of the roofing and growing media. More than 40% of all construction materials were from within 500 miles of the site. Passive Design Strategies The climate in Prague is driven by heating (3,542 heating degree days), with moderate summertime temperatures (only 1,029 cooling degree days) and low humidity. The building’s environmental strategy uses optimized orientation, high performance building fabric, natural ventilation via operable windows, advanced HVAC and lighting controls, and an automated external shading system. The building’s long façades face north and south, minimizing east and west exposure. This reduces cooling loads and provides passive solar gains when beneficial during winter months. The 70% glazing ratio is significantly above the Standard 90.1-2004 baseline, but double-pane units are argon filled with a low-e coating to minimize heat loss. *Based on gross building area. S U B M E T E R D ATA Submeter data is available for the energy-intensive data servers, server cooling, convenience store and kitchen facilities. Computer servers and server cooling consume 31% of the building energy. This equipment also provides services for other buildings within the Czech Republic, with 30% serving external needs. The servers provide basic computer services for the Headquarters along with meeting the needs of more energyintensive trading floors. The kitchen, servers and server cooling are atypical services for a commercial office and add significantly to the energy use intensity of the building. The total energy consumption should be considered in conjunction with the following data. Submeter 1, Kitchen Facilities: 648,708 kWh, 2.5 kBtu/gross ft2 · yr Submeter 2, Convenience Store: 50,079 kWh, 0.19 kBtu/gross ft2 · yr Submeter 3, Server Cooling: 1,014,923 kWh, 3.91 kBtu/gross ft2 · yr Submeter 4, Computer Servers: 2,583,980 kWh, 9.94 kBtu/gross ft2 · yr Energy consumption is quoted over the same time period (06/2007 to 05/2008), with energy intensity based on the total building gross square footage. The building team incorporated sustainable principles throughout construction. The building was constructed on a previously contaminated site that was first remediated. Waste was separated and recycled during construction. Thirteen 32 HIGH PERFORMING thousand cubic yards of concrete were salvaged from the previous development and reused in the new construction, while approximately 90% of the total waste was diverted from a landfill. Recycled materials were used for vibration insulation, Summer 2009 Meeting room lighting and HVAC controls allow occupants to adjust conditions, but the central building management system automatically turns lighting, heating and cooling off when the rooms are vacant. BUILDINGS Photo © Tomas Soucek

Table of Contents for the Digital Edition of High Performing Buildings - Summer 2009

High Performing Buildings - Summer 2009
Contents
Commentary
Jewish Reconstructionist Congregation
Designing Efficient Lighting
CSOB Headquarters, Prague
U.S. Homeland Security, Omaha
Stellar Commercial Building
Advertisers Index

High Performing Buildings - Summer 2009

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