Lakeway Regional Medical Center in Texas recently received LEED Silver certification and a 3-star rating from Austin Energy Green Building. Page provided planning, architecture, MEP and civil engineering and LEED consulting for Lakeway, which was constructed by Hoar Construction. The hospital welcomed its first patients in April 2012.
Planning of this healthcare facility embodied both Lean and Evidence-Based Design strategies, so the project naturally aligned with LEED and AEGB goals. Mandates to be cost effective and utilize sustainable design concepts, along with the surrounding Texas Hill Country landscape, impacted the final design solution for the 274,000-square-foot community hospital. The design team maximized the tight, steep site by creating a tall and relatively narrow building, with dramatic natural views and an abundance of natural daylight. This, combined with an onsite parking structure, which mitigates urban heat island effect, retained a great amount of open space.
The building was designed to have a compact footprint, while providing a high level of flexibility and planning for future expansion. Despite a relatively small site for the program, 57 percent of the site was restored using native and adapted landscaping, maintaining the important natural habitat and reducing water consumption associated with irrigation by an estimated 75 percent. Landscaping around the building helps control daylighting inside the hospital, and provides shaded gardens and water features that enhance the level of hospitality ambiance the client was seeking.
Extensive analysis was performed to achieve a highly efficient envelope to work in concert with mechanical systems to optimize the building’s energy savings. Numerous iterations of the design were investigated and analyzed, including shading locations, levels of insulation and percentage of glass. Shading devices were strategically placed to shade the southern face of the building during intense Texas summers. Reflective blue glazing on the building’s eastern curved face mirrors back views of the surrounding hill country, while reducing internal heat load.
Inside the hospital, the health risks associated with indoor air quality were given the highest priority with close attention paid to controlling contaminants and volatile organic compounds content in specified materials. The team selected low-VOC paints, adhesives, sealants and flooring systems and included contaminant source control through walk-off mats and high-ventilation rates throughout the facility.
Energy-efficient HVAC and lighting contributed to the building’s 23.7 percent energy savings, which were augmented by capturing waste heat to preheat hot water. The system design resulted in nearly 1 MW of avoided peak demand, contributing to a more reliable and cost-efficient electricity grid.
Mechanical systems consist of three 600-ton VFD driven centrifugal water-cooled chillers, coupled with two 350-ton VFD driven centrifugal water-cooled energy recovery heat pump chillers. The combined system efficiencies greatly aided in the LEED Silver pursuit.
The design team also emphasized conservation through a whole-building water system design that includes low-consumption fixtures and equipment, while using stringent guidelines for considering both infection control and durability. Ultra-low-flow urinals, ultra-low flow water closets, low-flow lavatories and showers and selective sensor-operated fixtures reduce water use from non-process fixtures by 20 percent, saving over 400,000 gallons annually. A comprehensive stormwater management system reduces and improves the quality of stormwater runoff. The project has achieved a 90 percent reduction in potable landscape water use.
The team selected material with a total recycled content of 32.7 percent and sourced 57 percent of building materials from Texas. Eight-two percent of the new wood used in the hospital was harvested in responsibly managed forests. The construction team worked diligently to exceed construction waste management goals of a 75 percent diversion rate, ultimately diverting 88 percent of construction waste (400 tons) away from landfills. The construction site was staged to optimize recycling potential while protecting and storing materials to bring the cleanest materials into the new hospital.