Preliminary investigation of the influence of equations of state on the performance of CO2 + C6F6 as innovative working fluid in transcritical cycles

sCO2 power cycle is the most investigated and promising technology for replacing conventional steam in CSP plants. Nevertheless, efficiency of strongly penalized by high ambient temperatures which are typical favourable locations. This paper focuses on a new working fluid cycles consists CO2 blended with C6F6. The addition C6F6 increases critical temperature allowing condensing up to 45 °C. calculated gross mechanical innovative around 42% when adopting Peng Robinson equation state van der Waals mixing rules maximum operating 550 °C minimum 51 performance varies just ±0.1% if prediction binary interaction parameter over- or under-estimated 50%, but more significantly other equations states adopted (up 1% points). Moreover, detailed analysis conditions components highlighted that design affected EoS. A sensitivity then performed identify where largest differences predicting occur.