High Performing Buildings - Spring 2009 - (Page 24) Photo © Beauchamp-Bourbeau The far wall of the atrium is composed of bricks recovered from the façades of the deconstructed buildings. The floors are active radiant slabs. Both the brick wall and the floors capture sunlight during the winter for passive solar heating. human interaction. A modular control scheme was implemented using “independent modules” to control the various subsystems (each ventilation system, chillers, boilers, geothermal borefield, solid thermal energy storage and radiant slabs), simplifying system programming, integration and interaction. the building’s energy performance. It was estimated that the average annual coefficient of performance of the entire power plant (water-cooled chillers, air-cooled chillers and boilers) is 2.50 in heating and 4.35 in cooling. The total energy consumption for the MNECB-compliant reference building was estimated at 11.17 MBtu/ ft², while the Normand-Maurice Building energy consumption was estimated at 6.34 MBtu/ft². This represents a 48.5% reduction in the energy consumption, corresponding to a reduction of 38.1% in energy costs (see Table 1). For the period between April 2006 and March 2007, the actual energy consumption for the building was 9,327 MBtu of electricity and 1,509 MBtu of natural gas, for a total of 10,862 MBtu or 4.75 MBtu/ft². Compared to the reference building, this represents reductions of 61% in energy consumption and 55% in energy costs. The projected overall annual savings of $172,000 CND turned out to be $246,000 CND, totalling approximately $6 million CND over 25 years and corresponding to a simple payback of about six years (counting financial incentives). Lastly, an overall annual reduction of 800 tons of CO2 was achieved. Ta b l E 1 S i m u l aT E d b u i l d i n g E n E r g y p E r f o r m a n C E regulated Energy Consumption lighting space Heating space Cooling Heat rejection Pumps fans service Water Heating Total proposed mWh eq 654 752 220 311 89 513 197 2,525 reference* mWh eq 1,116 3,470 229 584 78 1,052 198 6,726 difference % Energy –41% –80% –4% –47% +14% –51% ±0% -63% Cost Effectiveness Designers sought to reduce the energy used in the building by at least 50% compared to the requirements of the 1997 Model National Energy Code for Buildings (MNECB) of Canada. The overall cost for the building was approximately $45 million CND, which included roughly $1.5 million CND spent on sustainable development. Approximately $10 million CND was spent on the mechanical and electrical systems. Using thermal energy storage reduced the size of the geothermal heat exchanger by 40% without sacrificing the overall energy efficiency. For the LEED Canada-NC certification, energy simulations were made using EE4-CBIP, a software program designed to demonstrate a building’s compliance to the requirements of Canada’s Commercial Building Incentive Program (CBIP), to establish 24 HigH Performing Buildings Total Energy Consumption** 4,244 8,234 -48% regulated Energy Cost electricity natural gas Total $ Cnd 133,423 41,600 175,023 $ Cnd 202,034 157,232 359,266 difference % Cost –34% –74% –51% Total Energy Cost** 284,041 458,878 –38% *Based on a code-compliant building under Canada’s model energy code. **includes plug and process loads. spring 2009
For optimal viewing of this digital publication, please enable JavaScript and then refresh the page. If you would like to try to load the digital publication without using Flash Player detection, please click here.