ASHRAE Journal - March 2009 - (Page 18)

2009ASHRAE TEcHnology AwARdS 4200 St. Laurent Office Tower The owners and managers of the building wanted to reduce their energy consumption but still keep their building maintenance at the same level as prior to implementing energysaving measures. Thomas H. Durkin, Member ASHRAE Project: HVAC Renovation at George Washington Carver Elementary School No. 87, Indianapolis. Category: Institutional Buildings (Existing) The renovation of the more than 70-year-old George Washington Carver Elementary school in Indianapolis took a liability and turned it into an energy-saving asset. When the school was excavated in 1935, an underground stream was inadvertently intercepted. Since then, sump pumps have been running continuously to remove water from the boiler room. When cooling was added to the school in 2005, the HVAC solution used the groundwater as a geothermal heating source and cooling sink. The new system, a single unit located in a central mechanical room, is a combination of two technologies: a heat recovery chiller and geothermal (earth coupled) heater/chiller. The new system cools for less than half the cost of conventional equipment and heats for about one quarter the cost of the old system. In addition to the HVAC solution, lighting upgrades also were implemented, updating the mid-1980s fixtures. Overall, gas consumption was reduced from $28,000 per year to almost zero. Electric consumption increased from $22,770 to $42,499. Total utility cost was reduced from $51,270 (with no AC) to $43,111 after renovation with the entire building cooled, a 16% reduction. Kenneth Sonmor, Member ASHRAE Project: 4200 St. Laurent Office Tower, Montreal Category: Commercial Buildings (Existing) The owners and managers of a 13-story office building in 18 ASHRAE Journal NREL Science and Technology Facility Specific design and energy-saving goals were clearly established prior to construction of the new facility. A modeling study was done to study the impact of emissions from a variety of the lab’s exhaust sources. Montreal with a floor area of 350,000 ft2 (32 516 m2) wanted to reduce their energy consumption but still keep their building maintenance at the same level as prior to implementing energysaving measures. The building consists mostly of commercial office space and houses a textile manufacturing company and retail. Energy-saving measures implemented included installing the building’s direct digital controls, electrical systems, and the heating system of the building’s envelope. A heat recovery system preheats the entering fresh air. The system consists of two units. The first is a patent-pending system that transfers heat from the exhaust air into the fresh air supplied by the indirect gas-fired fresh air unit on the roof of the building. The second unit transfers the heat of the warm water from the fan-coil condensers into the fresh air supplied by the first unit. Both units can recover 1,100 MBh of heat. The annual natural gas consumption was reduced by 272 577 m3, corresponding to 701 tons (636 Mg) of equivalent CO2 emissions. Total electrical savings were 16% of original consumption. Total project cost, after grants, was $325,449. The project is expected to pay for itself within 2.1 years. Second Place Winner Eric L. Kirkland, Member ASHRAE Project: NREL Science and Technology Facility, Golden, Colo. Category: Institutional Buildings (New) Specific design and energy-saving goals were clearly established prior to construction of the new Science and Technology ashrae.org March 2009 http://www.ashrae.org

Table of Contents Feed for the Digital Edition of ASHRAE Journal - March 2009

Contents Commentary Industry News Letters Meetings and Shows Special Section 2009 ASHRAE Technology Awards Feature Articles Heat Recovery for Office Tower Air Motion Control in the Hospital Operating Room Anniversary Feature: Five Defrost Methods for Commercial Refrigeration Groundwater Issues: Commercial Open Loop Heat Pump Systems Used Filters and Indoor Air Quality Building Sciences Emerging Technologies Washington Report Products Special Products People Classified Advertising Advertising Index

ASHRAE Journal - March 2009

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