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 Alternative / Renewable Energy » Twitter Facebook LinkedIn RSS Email to a Friend * required fields From* To * Message cancel Email Print Print Related Coverage Inside San Francisco Airport’s Triple Zero Plan Princeton Lab Reaps Payback on LED Units ADDITIONAL FM TOPICS Lighting Next Generation Lighting – The Emergence of POE For Lighting Lighting Navigating the Complex World of Automated Window Shading Lighting Are LEDs Harmful? Lighting MGM Evaluates Its Lamp Options for New Office Space Lighting Why the Time is Now for Advanced Lighting Controls Project Management The Key to Project Success: Collaboration Roofing The Vital Role of Insulation in Roofing Systems HVAC Portable Air Conditioners Taming Hot Summer Temperatures: Keeping People & Networks Safe Security A New Approach to Vendor Risk Management Related Articles Avoid Scams and Do These 12 Things After a Hail Storm Repairing a Roof After a Storm Factors That Create Roofing Resilience Flammable Cladding Blamed for Grenfell Tower Fire Could Your Roof Use a Coating? 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.