Ageing study of thermal heat transfer fluids used in solar thermal power plants based on Fresnel Collector technology

Solar energy has experienced growth in these last decades due to financial supports delivered by governments and technological enhancements. Reducing cost and maintaining good performance is the main object of current studies. Fresnel system seems to be a good choice, as this technology is cheaper to implement due to its straightforward design. However, the Fresnel power plant efficiency depends on many criterions such as the appropriate heat transfer fluid (HTF). The present paper reports the ageing behavior of two synthetic oils (dibenzyletoluene (DBT) and hydrogenated terphenyl (HT)) at 250°C for 500 h. The aim is to choose the best HTF to use with Fresnel Collector technology which corresponds to a temperature range of 250-450°C.