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PV materials as BIPV could be designed during new construction. More information is available on the Whole Building Design Guide Web site: http://www.wbdg.org/resources/bipv.php#ar Demonstration Potential: 3 The demonstration potential for this technology was ranked medium due to commercial building application and overseas buildings where technology advances have been made (such as in Germany and Japan). Opportunity #8 – Integrated Roof Systems (Generation, Cool Roofs, Water Catchment) Integrated roof systems that combine both thermal and electrical generation, reduce solar heat gains into the building, and utilize water catchment systems demonstrate an integrated approach to sustainable and high-performance building design. Often, the high initial cost of PV and solar thermal systems prevents them from being included in new construction or roof replacement projects. However, with better incentives, technological improvements, and rising conventional power prices, energy from solar sources will become more cost competitive. It is NREL’s recommendation that DOD develop two new roof specifications: one that integrates the technologies described above, and another that ensures that the roof is “solar ready” and can easily take advantage of an environment more favorable to renewable energy. Without the forethought to make roofs solar ready, solar installation may not be technically possible or the added costs of making infrastructure changes may make solar applications economically prohibitive. The general guidelines for constructing a solar ready roof are provided below: Avoid shading from trees, buildings, etc. (especially during peak sunlight hours). Determine where a future solar array might be placed. If the roof is sloped, the south-facing section will optimize the system performance; keep the south-facing section obstruction-free if possible. Minimize rooftop equipment to maximize available open area for solar collector placement The type of roof installed can greatly affect the cost of installing solar later The roof must be capable of carrying the load of the solar equipment. (PV – between 3 and 6 lb/ft2, solar thermal – between 2 and 5.5 lb/ft2) The wind loads on rooftop solar equipment must be analyzed in order to ensure that the roof structure is sufficient. See the American Society of Civil Engineers International Building Code 7-05 for the method to calculate these loads. Add additional safety equipment for solar equipment access and installation. The best roof for a flat application is a white (cool) fully adhered thermoplastic olefin or polyolefin membrane roof. This roof is often an excellent choice for commercial applications, being both cost-effective and more environmentally friendly than some other options. Other membrane roofs can also work well with solar such as ethylene propylene diene monomer or polyvinyl chloride (PVC). It is important to avoid river rock ballasted membrane roofs. The determination for where it is cost effective to install integrated roofs with renewable energy technologies should be made based on local energy costs, solar resource, and incentives. Both roof systems should come equipped with the same roof water catchment specification. 159PDF Image | 4th Annual Chena Renewable Energy Fair
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