High Performing Buildings - Spring 2009 - (Page 19) normand-maurice Building B y a s h ly lyo n s , m e m B e r a s h r a e ; F r e d e r i c g e n e s t, P. e . , m e m B e r a s h r a e ; a n d J a c q u e s d e g r a c e , P. e . , m e m B e r a s h r a e design and systems natural Ventilation With the objectives of sustainable development and energy efficiency, natural ventilation was integrated for the Normand-Maurice Building early within the design. However, natural ventilation is restricted due to very cold peak winter conditions and the occasional very humid peak summer conditions. For this project, a hybrid ventilation system combined with dedicated heating and cooling systems was designed to separate the ventilation needs from the heating and cooling needs. Natural ventilation or mechanical ventilation is used with complementary mechanical heating and cooling systems. When the outdoor conditions allow, the motorized windows located at the top of the multistory skylights, the gymnasium and the atrium open. The skylights are designed to allow daylight to penetrate all three levels of the building. The windows of the occupied spaces can be opened manually. mechanical Ventilation Heating is mainly done with high efficiency energy recovery from the exhaust air (either enthalpy wheel or heat pipes). Adiabatic humidification is used in the main building HVAC system. Water is sprayed onto an evaporative media in the ventilation system instead of directly using vapor from a steam boiler. When the water evaporates, the air is cooled and, if required, later reheated by the low-temperature heating loop. A dedicated outdoor air system supplies outside air to the other HVAC systems. It is equipped with an enthalpy wheel and provides suitably dehumidified air to prevent condensation on the cold radiant slabs. The outside airflow rates are modulated to compensate for required exhaust rate in sanitary spaces as well as to maintain acceptable CO2 levels in the occupied spaces (using CO2 sensors in the appropriate spaces). underfloor Air system For offices and classrooms, an underfloor air-distribution system was selected. This technology pressurizes an underfloor plenum and uses floor diffusers to distribute air to the spaces. This method has several advantages, namely less horizontal ducts and less restriction to air movement, allowing a reduction of the fan power needed. Low-velocity floor supply (i.e. displacement ventilation) prevents too much mixing in the space. While adequate indoor conditions are maintained in the occupied space, less adequate conditions can be maintained higher up. For instance, ASHRAE Standard 62.1-2007 suggests a ventilation efficiency of 120% with this approach, allowing a spring 2009 HigH B u i l d i n g at a g l a n c e Building name normand-maurice Building location 740 Bel-Air street, montreal size 168,900 ft2 started 2002 Completed 2005 Building use offices, classrooms, meeting rooms, warehouses, gymnasium, firing range, cafeterias, workshops and 10 weather-protected truck docks Cost $45 million Cnd distinctions international attention in oslo at the annual green Building Challenge in 2002, excellence Award in 2005 from the Canadian institute of steel Construction, 2009 AsHrAe Technology Award Building team owner Public Works governmental services Canada (PWgsC) Contractor décarel inc. Architects ABCP Beauchamp-Bourbeau and , Busby Perkins+Will landscape Architects rousseau lefebvre sustainable development lyse m Tremblay architecte structural engineers saïa, deslauriers, Kadanoff, leconte, Brisebois, Blais mechanical/electrical engineers Pageau morel Performing Buildings 19
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