High Performing Buildings - Spring 2012 - (Page 26)

buiLding EnVELoPE Roof Type Thermoplastic polyolefin (TPo) single-ply membrane overall r-value r-20 reflectivity 0.79 Walls Type Concrete masonry unit (foam filled) with stucco or face brick overall r-value r-25 glazing percentage 35.4% Windows low-e glass, 1 in. insulated u-value 0.26 solar Heat gain Coefficient (sHgC) 0.27 Visual Transmittance 64% Location latitude 28˚n orientation not applicable; l-shaped footprint mechanical mezzanine. Each AHU is provided with two condensing units located on grade, and includes dual circuit interlaced DX cooling coils. This provides the system with staging compressors during periods of non-peak demand. The system also includes a programmable thermostat. Outside air is ducted directly into the return side of each air handler. Increased wall and roof insulation, state-of-the-art insulated glass, large overhangs and sun shades, solar reflective roofing material, doubleroof design for passive cooling, high efficiency HVAC system design and equipment, and a daylight harvesting fluorescent and compact fluorescent lighting system reduce the building’s energy demand 36% below average requirements of similar commercial structures. Photovoltaics In addition to the existing ice cream shop, the previously developed site had a 100 ft utility right-of-way for overhead high tension power lines that occupy the triangular site’s southwest hypotenuse. However, this right-of-way area is ideal in that it secures long-term solar access for the 309 photovoltaic (PV) panels located above the south oriented solar reflective roof membrane. The “photovoltaic blanket” is significantly elevated above the solar reflective roof membrane. This creates a double roof that dissipates direct solar heat gain as well as the operating heat of the PV modules through natural convection between the two roof layers. The branch’s 58 kW roofmounted PV array is designed to produce 85,717 kWh per year, roughly 101% of the building’s estimated energy requirements. This project was designed to qualify the branch as a source, site, and emissions (carbon) net zero energy building, as defined by the U.S. Department of Energy. A financial institution requires only a little water. Low-flow water fixtures, including faucets and water closets, reduce water by 45% when compared to conventional fixture design. Above The stainless steel downspout near the main entry directs rainwater to underground cistern tanks that supply water for irrigation and flushing. Below The open plan design creates a place for a variety of evening and weekend community events, including Wii tennis tournaments and couponing classes. Envelope and HVAC Locating the new building within inches of the existing ice cream shop was an energy-saving feature. The cohesive design also passively reduces energy required for both structures’ cooling loads by reducing the total amount of exterior walls that are subject to the Central Florida climate; therefore, each building is more efficient than if they were designed to be standalone structures. Two DX central station airhandling units are located in the 26 HigH Performing Buildings spring 2012

Table of Contents for the Digital Edition of High Performing Buildings - Spring 2012

High Performing Buildings - Spring 2012
Commentary
Contents
Evie Garrett Dennis Campus
Magnify Credit Union South Lakeland Branch
Natural Resources Defense Council
What Makes Buildings High Performing
University of Florida’s William R. Hough Hall
Products
Advertisers Index

High Performing Buildings - Spring 2012