Pittsburgh, March 18, 2010 — Alcoa is jointly testing an advanced solar technology with the U.S. Department of Energy National Renewable Energy Lab, with the goal of making concentrating solar power technology competitive in the U.S.
The series of tests will measure the 20-foot by 46-foot collector’s efficiency to generate energy and evaluate its structural performance. This round of validation at NREL follows successful tests at Alcoa Technical Center outside of Pittsburgh, Pa., USA.
“NREL is looking forward to performing outdoor efficiency tests on the innovative new parabolic trough collector developed by Alcoa,” said Dr. Chuck Kutscher, Manager, NREL Thermal Systems Group. “We are excited to see a major U.S.-based manufacturer entering the concentrating solar power market through the financial support of the U.S. Department of Energy’s Funding Opportunity Announcement Program.”
Currently, commercial concentrating solar power systems installed to date use glass mirrors to reflect and concentrate sunlight onto receivers that collect the solar energy and convert it to heat. This thermal energy can then be used to produce utility scale electricity via a steam turbine.
Instead of glass mirrors, the new Alcoa solution uses highly-reflective aluminum mirrors, which are more durable and environmentally-friendly than fragile glass-based mirrors.
The Alcoa design solution enables high-volume manufacturing techniques to lower installation costs, plus its monolithic structure enables a simple “drop-in-place” collector for easy installation. The Alcoa design includes sheet, extrusions and fasteners.
The new Alcoa CSP design leverages high volume manufacturing and assembly approaches utilized in the aerospace and automotive markets as well as the company’s materials and technology leadership to lower the cost of CSP trough systems.
One of the benefits of concentrating solar power technology is that thermal energy can be stored and drawn upon during short periods of clouds and at night. Therefore, the technology provides better grid stability and increased capacity factors compared to photovoltaic applications.
The project is being partially funded by a $2.1 million DOE grant. Test results are expected by the second quarter of 2010, after which the system will enter its next level of large-scale testing.
Alcoa is the world’s leading producer of primary aluminum, fabricated aluminum and alumina.