High-Performance Energy-Efficient Cool Metal Roof Assemblies Utilizing Building Integrated Renewable Solar Energy Technologies for New and Retrofit Building Construction.

摘要

The Department of Defense (DoD) manages over 577,500 buildings and structures. As the USA s single largest energy consumer, the DoD needs to reduce its carbon footprint and lower its demand for energy and water. Buildings with roofs more than 25 years old generally need to upgrade the roofs and insulation, ventilation and rainwater/drainage systems to meet current standards. The goal of this project was to determine if the dynamic integrated retrofit metal roofing system illustrated below could reduce overall energy consumption and cost when retrofitting existing buildings, to meet the DoD s energy intensity reduction targets. The Demonstration Project constructed a retrofit roofing system that is illustrated in the following two figures. While the value of the data collected from the project was unfortunately compromised by a major renovation deemed essential by the project s host, Goodfellow Air Force Base, analyses in this report, detailed in Section 7, clearly indicate that retrofit roofing projects can play a significant role in reducing the energy intensity of older buildings in the DoD s real estate inventory and in the private sector. The Savings to Investment Ratios (SIR) range widely, from approximately 16 to approximately 3.99, varying as a function of technology type, project location and energy offset, but this analysis does generally support the basic idea that high performance roofing systems do have a payback and a measurable return on investment as the DoD expands renewable energy and conservation programs through Public Private Ventures and Power Purchase Agreements.