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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 CO 2 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 200C without the need of tracking. Validated numerical models of external compound parabolicdoi:10.3934/energy.2014.1.99 fatcat:zurodiqclndnrgkidbqckz7fey