Building-Integrated Photovoltaics for Low-Slope Commercial Roofs

[+] Author and Article Information
William A. Miller

Buildings Technology Center,  Oak Ridge National Laboratory, Oak Ridge, TN 37831-6070

Ed Brown

 ORNL Intern, 5344 NW 32ND Lane, Gainesville, FL 326060

Rita Jo Livezey

 RSOE/RTA/EMERGING Technologies, 1101 Market St., SP 5D Chattanooga, TN 37402–2801

A National User Facility provides private industry the opportunity to collaborate on technical issues that require the unique research facilities and capabilities available at a national laboratory.

1kWm2 at Si cell temperature of 77°F(25°C).

Each roof is described generically using an RxxEyy designation. “Rxx” states the solar reflectance of a new sample, with 1.0 being a perfect reflector. (Eyy) defines the infrared emittance of the new sample, with 1.0 being blackbody radiation. Thus, labeling the BUR as R05E90 indicates that it has a reflectance of 0.05 and an emittance of 0.90.

J. Sol. Energy Eng 127(3), 307-313 (Aug 23, 2004) (7 pages) doi:10.1115/1.1877514 History: Received May 03, 2004; Revised August 23, 2004

A photovoltaic (PV) distributed energy resource (DER) was established to support the Tennessee Valley Authority’s Green Power Switch program, which allows utility customers to purchase blocks of electricity generated by solar resources. The PV DER was also used to study the potential shading benefits of roof-mounted PV systems for commercial buildings. Test data derived by monitoring an offset-mounted PV array shading a built-up low-slope roof system shows that the annual savings per square foot of low-slope roof can be as high as $0.18 ($1.95 per square meter) in Phoenix, AZ.

Copyright © 2005 by American Society of Mechanical Engineers
Topics: Roofs
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Figure 1

The Envelope Systems Research Apparatus (ESRA), used for testing reflective roof productssl

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Figure 2

Offset-mounted photovoltaic panels installed on the low-stope roof and on the south-facing wall of ESRA

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Figure 3

Biomass growth in shaded and fully exposed sections of thermoplastic membranes

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Figure 4

ESRA field data for a fully exposed BUR and the same BUR shaded by PVs

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Figure 5

Phoenix, AZ, annual cooling load savings with BIPV

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Figure 6

Minneapolis, MN, annual heating load savings with BIPV

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Figure 7

Annual roof load savings with BIPV on a BUR (R05E90)




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