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Carbon dioxide as working fluid for medium and high-temperature concentrated solar thermal systems

Van Duong Gerardo Diaz

*Corresponding author: Gerardo Diaz gdiaz@ucmerced.edu

energy2014,1,99doi:10.3934/energy.2014.1.99

This paper explores the benefits and drawbacks of using carbon dioxide in solar thermal systems at medium and high operating temperatures. For medium temperatures, application of CO2 in non-imaging-optics based compound parabolic concentrators (CPC) combined with evacuated-tube collectors is studied. These collectors have been shown to obtain efficiencies higher than 40% operating at around 200℃ without the need of tracking. Validated numerical models of external compound parabolic concentrators (XCPCs) are used to simulate their performance using CO2 as working fluid. For higher temperatures, a mathematical model is implemented to analyze the operating performance of a parabolic trough solar collector (PTC) using CO2 at temperatures between 100℃ and 600℃.

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