Engineered Systems - June 2008 - (Page 22)

CaseInPoint winter and uses the cooling effect of the water in the summer. A radiant ﬂoor system with cross-linked, counterﬂow tubing uses the water to convey heating and cooling to the space. The system uses less energy to provide the same level of comfort as traditional systems, due to the temperature variance between the occupants and the ﬂoor itself. “Since the system has been operating it has already provided a very cool and comfortable environment during some very hot weather,” said Kaneda. “It is a very efﬁcient system that will help us meet our net zero energy target.” A Johnson Controls Metasys® BMS controls the ﬂow rates and slab temperature to provide the maximum performance using the least amount of energy. Pump speeds are kept at their lowest demand speed using power inverter technology that responds to actual demand. Floor condensation is monitored and dehumidiﬁcation provided, if needed, with an air-handling system that also uses the water from the geothermal system. The Metasys system also monitors air quality sensors and automatically operates the air handler when CO2 levels rise above a preset point. NET-ZERO DESIGN A building integrated photovoltaic system is the facility’s energy source. The panels in this system are part of the single-ply membrane roof installed on the facility. The electrical system is tied into the grid, so it will draw power at night when there is no sunlight and deliver power back to the grid when more energy is generated than is being used during the day. The result is designed to be “net-zero” in overall energy use. Would you believe that this building was a 1960s-era windowless concrete bank? Now it houses an engineering consultancy and uses renewable energy from photovoltaics to meet 100% of its energy requirements, burning no fossil fuels, and producing no net greenhouse gas emissions. vantage of the fact that the temperature below ground remains constant all year round — about 10°C in this case. Water ﬂows through pipes laid under an open landscape area and passes into the building, where a heat exchanger collects the heat from the water in the Input 107 at www.esmagazine.com/instantproductinfo 22 En gi neer ESM06084SAM#1.indd 1 ed S y stem s June 2008 5/15/08 2:25:25 PM http://www.sanuvox.com http://www.sanuvox.com http://www.esmagazine.com/instantproductinfo

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Engineered Systems - June 2008 Contents Editor’s Note Letters To The Editor Back2Basics HVAC Challenge Case In Point Commissioning Efficiency Incentives HydroTech Building Automation Energy Wiz HVACR Designer Tips Notre Dame Tackles the Heat State Of The Arts Time For A Transplant? Project Delivery: What Can IPD Do For You? Issues & Events Computers & Software Products Application Checklist Glossary Classifieds Advertiser Index Tomorrow’s Engineer

Engineered Systems - June 2008

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