Thermal Stability and Decomposition of Synthetic Oils in Medium-Temperature CSP Systems

Abstract

This short communication investigates the thermal stability and decomposition behavior of synthetic oils used in medium-temperature concentrated solar power (CSP) systems. We present new experimental data on the thermal degradation of biphenyl/diphenyl oxide mixtures under CSP-relevant conditions. Our findings reveal a critical temperature threshold for accelerated decomposition and identify key degradation products. These results have significant implications for optimizing heat transfer fluid (HTF) selection and maintenance strategies in CSP plants, potentially extending operational lifetimes and improving overall system efficiency