06/27/2006

NIST Studies Rooftop Photovoltaics for Cost Effectiveness

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).
 


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Visit our website today to learn about the design flexibility of a Morton building and the endless possibilities of partnering with our designBUILD team.


Wood construction is both cost and energy efficient. Check out Morton Buildings and our designBUILD team online today to discover all the benefits of post-frame construction.


When choosing a metal-clad building for your next construction project, consider Morton Buildings, Inc., and their designBUILD team, we’ll make your dream a reality.

We Can Help You Reduce Energy by 30%

Our mission is to help our customers manage their buildings' energy costs, improve reliability, and enhance performance while having a positive impact on the environment.
CLICK HERE to find out how.

Add highly responsive multi-zone comfort to any building project, in any climate. Our CITY MULTI H2i R2- and Y-Series VRF systems give you flexibility to fit the needs of any building. Enjoy 100% heating capacity at 0°F outdoor ambient, and 85% heating capacity at -13°F outdoor ambient.  For more information, log on to www.mitsubishipro.com

 
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