The first commercial-scale Duke Solar Power Roof™, a roof-integrated solar cooling and heating system, began operation in Raleigh, North Carolina in late July 2002. This system is designed to provide 176 kW (50 ton) of solar-driven space cooling using a unique nonimaging concentrating solar collector. The measured performance of the system during its first months of operation is reported here, along with a description of the design and operation of this system.

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