Marta Vivar and Vernie Everett A review of optical and thermal transfer fluids used for optical adaptation or beam-splitting in concentrating solar systems Progress in Photovoltaics: Research and Applications 22
There exist a wide variety of solar thermal, photovoltaic, and hybrid photovoltaic-thermal concentrator systems and concepts that use liquids for optical adaptation and heat transfer. Depending on the functional purpose of the fluid, which can be used for heat transfer, optical adaptation, spectral filtering, or a combination of these applications, different fluid property requirements need to be met. This review studies these generic, actively cooled solar concentrators and their associated requirements for liquids. The most suitable fluid candidates available in the market are assessed according to their properties and applications, with a special emphasis on fluid toxicity and long-term performance.
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