AFE May/June 2012 : Page 22THE CURRENT STATUS AND TRENDS IN ENERGY-EFFICIENT & SUSTAINABLE FACILITIES TABLE 2. Important Building Features NORMAND MAURICE BUILDING MONTREAL, CANADA ■ ■ ■ ■ ■ ■ Geothermal heating Sand-based thermal storage Direct digital controls Enthalpy wheels Outstanding energy performance Large percentage of demolition materials recycled ■ Large reduction in water usage and sewage ■ Daylighting UMASS HEALTHCARE RENOVATION WORCESTER, MA ■ Innovative energy audit ■ Incorrect cross-connection in existing chillers ■ Three-month payback for renovations buildings, while initially more concerned with environmental issues, have morphed over the years to include energy effi cien-cies and sustainability issues. Due to this change, “sustain-able” and “green” buildings have essentially come to mean the same thing. Th e fi eld of sustainability is also not a static area. Th e fed-eral and state requirements for sustainable design, construc-tion and operation are continuing to change toward more restrictive requirements. Voluntary adherence to existing and proposed environmental and sustainable programs is also growing. Sustainable development, in both new con-struction and remodels, involves major considerations in sustainable design and construction, resource effi ciency, waste reduction, water management and ecological design. Paramount among these considerations are health, comfort and energy effi ciency. Th e buildings listed in Table 1 represent four outstanding blends of modern sustainable and energy effi cient design, and one off ers an example that is not economically justifi ed. Table 2 summarizes the main features of the fi ve buildings. Normand Maurice Th e Normand Maurice building is a Canadian government building of 168,900 square feet. Th e main features of the HVAC system are three HFC-based chillers, two gas-fi red boilers, a geothermal heat exchanger on the surface utilizing 60, 450-foot-deep boreholes, sand-based thermal storage un-der 12-inch concrete slabs, extensive natural ventilation, and enthalpy wheels to preheat (or cool) incoming air. Th is system and the building envelope design produced large reductions in energy consumption (61 percent) and energy cost (55 percent) compared to the Canadian building standard. Sustainable features included: ■ Recycling of material (from old foundry that was demol-ished) ■ 100 percent recycle of steel ■ 82 percent recycle of wood ■ 92 percent recycle of brick ■ 75 percent of demo material diverted from landfi ll ■ 30 percent less potable water used / 50 percent less water to sewer ■ Rainwater and greywater treated and reused in toilets and urinals ■ Green roof with no irrigation ■ Envelope ■ Skylights – penetrating multiple levels ■ Shading ■ Maximizing daylighting and solar heating ORNL OFFICE BUILDING OAK RIDGE, TN ■ ■ ■ ■ ■ Solar remodel totaling $660,000 Increased insulation Computer optimization Savings of $15,000/year Payback time of 44 years HOLY WISDOM MONASTERY MIDDLETON, WI ■ ■ ■ ■ ■ ■ ■ Energy usage of 32.6 kBTU/ft 2 R-30 roof High-effi ciency HVAC Closed-loop ground-source heat pump 85 percent daylighted Low-fl ow fi xtures and waterless urinals Repurposed gypsum, asphalt, steel & glass TIAA-CREF HEADQUARTERS NEW YORK, NY ■ ■ ■ ■ ■ ■ ■ Shifted peak-to-night ice production Signifi cant demand reduction Controlled maximized effi ciencies $765,000 savings in annual operation expenses $219,000 state rebate 25 percent IRR Saves 6.1 million pounds of CO 2 Health Clinic at the University of Massachusetts Th e University of Massachusetts healthcare renovation involved 14,000 square feet for a clinic requiring 100 per-cent outside air. Two steam-absorption chillers (installed in the 1960s) cross-connected to a centrifugal chiller (1980s), in poor condition, were available. Preliminary calculations 22 May | June 2012 ■ Facilities Engineering Journal ■ www.AFE.org Publication List Using a screen reader? Click Here |
