By Robert Scichili and Scott Kri, Retrofit Magazine.
According to Washington, D.C.-based Energy Star, there are 4.8 million existing commercial buildings in the U.S. and 40 percent of them were built prior to 1970, a time when energy efficiency was not the priority it is today. As a result, our nation has a large inventory of buildings that are poorly insulated and are using inefficient appliances, air-handling equipment, lighting and windows.
The good news is work has already begun on the use of new building technologies and systems to implement energy-efficient solutions to these buildings. In fact, a number of federal agencies and departments have stepped up their activities to set an example toward meeting new efficiency goals. Consider the following:
Even the U.S. Department of Defense, which is the world’s largest consumer of energy, is taking a leadership role in energy, sustainability and retrofit solutions for the 2.4 billion square feet of building space it operates. By installing a test retrofit project at Goodfellow Air Force Base, San Angelo, Texas, DoD is learning how today’s roofing technologies can enhance its energy-efficiency goals.
In 2007, Congress passed the National Defense Authorization Act, which requires DoD to produce or procure 25 percent of all energy from renewable sources by 2025. In addition, the federal government has mandated DoD institute a 30 percent energy use reduction on its properties by 2015 and another 37.5 percent reduction by 2020.
Through the use of the DoD Environmental Security Technologies Certification Program (ESTCP), the military is providing grants to industry to demonstrate commercially available and sustainable novel technologies, products and systems aimed at meeting DoD’s energy- and water-conservation goals.
One such ESTCP grant was awarded in 2010 to a team of metal construction industry-leading companies and the Metal Construction Association, Glenview, Illinois. The approximate $1 million grant is being used to demonstrate a retrofit metal roof system with integrated renewable energy technologies that showcases a holistic assembly of six different roofing system components. The ESTCP grant was awarded to this team in particular because the group offered the only retrofit metal roofing system integrating other energy-saving technologies to form a building envelope.
These core team members have been tireless in their time and talent toward the three-year grant process and attainment of the grant itself. The significance of the ESTCP grant award is there is no metal roof assembly in demonstration anywhere that will have the impact of what has been installed at Goodfellow Air Force Base, San Angelo, Texas.
The project targeted retrofitting an 11,900-square-foot metal roof on a 10,000-square-foot Security Forces building at Goodfellow Air Force Base. Prior to the installation of the roof system, DOE’s Oak Ridge National Laboratory, Oak Ridge, Tennesee, installed a data acquisition system to monitor various temperatures and heat information on the building. In addition to measuring energy data, the building’s utility billing information was collected. When the baseline of energy usage was established, installation of the retrofit metal roof system began in April 2012 and was completed in June 2012. The integrated technologies were installed in the following manner:
The holistic use of these integrated components into one retrofit system is designed to maximize electricity generation and minimize the cooling load of the building. In addition, the solar-thermal technology that is integrated into the retrofit cavity will optimize the energy generated for domestic hot water and space heating.
The project is expected to yield more than 750,000 KBtu of energy per year through savings from energy-efficiency improvements to this building or harvested energy generated from solar-power systems on the roof. With the local utility costs taken into account, Goodfellow Air Force Base is estimating a savings of $11,750 per year on this building thanks to the retrofit roof.
With the retrofitted integrated metal roof system in place, the surface of the roof is now being used to capture rainwater in an above-ground cistern with a 10,000 gallon capacity. It is estimated that a typical 2-inch rainfall in the San Angelo region will generate 6,500 gallons of rainwater being captured from one side of the roof. The rainwater will be used for irrigation purposes on the base. Estimates suggest 131,000 gallons of potable water per year will be saved from being used for irrigation.
With the full installation and commissioning now complete, the plan is to have ORNL continue monitoring data during the next 12 months. Data will be taken on:
The ESTCP, DoD and project team are confident this integrated retrofit roof system will perform as predicted and allow for the technology to be transferred throughout DoD, as well as to other federal agencies and ultimately into the commercial building sector.
Original article: Retrofit
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