Hi everyone, I have been asked to come up with a methodology for how to calculate actual performance of a CSP system with ORC. I can put any measurement device i want. The system composed of 4 parts; 1)Parabolic trough collector field 2)For back up heater a boiler uses propane as fuel 3)Organic Rankine Cycle uses R245fa as working fluid 4)Wet cooling tower For the collectors i thought the efficiency will be the amount of energy which collectors can convert into useful heat divided by the total beam insolation on the collectors. eff_coll = (m_water*C_p*(T_e - T_i))/(I_b*cos_theta*A_p) where I_b total beam insolation on the collectors, theta is the angle of incidence and the A_p is the aperture area of the collectors. The need of a pyrheliometer is obvious, two thermocouples for the inlet and exit of the collectors, a flow meter and a pressure sensor for pipes of the collector field. But for the other parts i'm little bit confused how to calculate. Any ideas?