NIST Studies Rooftop Photovoltaics for Cost Effectiveness 06/27/2006 | Organization hopes to generate better data for energy-prediction models New generations of photovoltaic (PV) roofing products utilize designs that allow them to be integral parts of the roof, providing both electricity and shelter from the elements. But, how effective would they be on your roof? This month, the National Institute of Standards and Technology (NIST) began a 15-month research project to help resolve such basic costs concerns. At its new Roof Photovoltaic Test Facility, NIST is monitoring the electrical performance and thermal performance of seven different residential systems designed for sloped roofs and two commercial building units designed for flat, industrial roofs. The data will be used to evaluate and improve computer algorithms for software simulation programs that predict the installed energy production of photovoltaic roof installations. The test photovoltaic systems are blended into concrete tile, slate, and asphalt shingle roofs for residential applications and in raised, unframed modules for commercial applications. Each of the nine photovoltaic systems fall within the three general categories of photovoltaic cell technology - single crystalline, polycrystalline, and amorphous silicon - with each unit representing different manufacturing processes, materials, and design features. Current, voltage, and power output are sampled four times per minute for each test specimen. Ambient temperature, wind speed, and the temperature of the test specimens also are measured at numerous locations because the operating temperature of photovoltaic modules affects the conversion efficiency of the units. Finally, the researchers are taking solar radiation measurements at the various planes of the installed roofing projects. Comparative analysis of the solar radiation data will allow NIST researchers to determine the accuracy of solar radiation models that take the horizontal radiation measurements, normally available at airports, and compute the quantity of solar radiation on surfaces at various tile angles. The results will be published in the open literature. Some intermediate results may be published prior to the end of the 15-month study. Ultimately, consumers could have access to a new generation of simulation models developed or validated with NIST data that will be useful in any given geographic location, building orientation, and with any photovoltaic-cell technology. This information was reprinted with permission from the National Institute of Standards and Technology (www.nist.gov). For more information, go to (www.bfrl.nist.gov/863/bipv/roof.htm). Previous ArticleNext ArticleENERGY STAR Announces 2013 Upgrade of Portfolio Manager Read more on Lighting » Twitter Facebook LinkedIn Email Share Share Other Open Social Related Coverage Pipe in Natural Light with Tubular Daylighting Devices Lighting Controls Association Releases Light Guide for Open Offices Fix a Glaring Issue in Your Building with Electrochromic Windows Related Articles Lighting How to Designate LED Direct Replacement Lamps Lighting D.C. Office Earns Double Platinum Green Certification Lighting Whole-Building Approach Finds Savings in Efficient Systems Lighting Next Generation Lighting – The Emergence of POE For Lighting Life/Fire Safety 7 Most Essential NFPA® Standards for Building Owners Sustainability / Resilience How to Future-Proof Your Building Building Controls The First Steps of Adding Intelligence to Your Facility Energy Management How to Increase Productivity and Engagement in Outdoor Spaces Building Controls Fine-Tuning HVAC Controls for Maximum Efficiency Related Articles Heat Island Effect: What You Need to Know (Including Solutions) 3 Vital Roles of Roofing Insulation 5 Money-Saving Roofing Products: 2018 Vegetative Roofs: 3 Tips for Planning Maintenance What's the Best Roof for Your Building? Sponsored Links Smart roof systems improve building energy efficiency. Polyglass’ Polyfresko® cap sheets with CURE Technology® saves on energy. Engineered to perform, Polyfresko has superior granule adhesion and excellent puncture, stain and UV resistance. Increase profitability by cleaning smarter and transforming your building into a high performing asset. Get tips from High Performance Building experts Whether it’s earning an IREM credential or increasing your job skills, any goal in property management can be accomplished with IREM education. Click here to visit our website!