Hi My 2'nd year of engineering doesn't quite let me to find an answer to the following problem: In a nutshell: I want to use rankine cycle to extract 5kW worth of electrical energy from a system utilizing R134a as working fluid. The properies of R134a are as follows: Tag R134a Compound CH2FCF3 MolMass 102.03 Critical T 101.08 Critical P 4060.3 Critical D 515.3 Critical V 0.00194 Gas Cosnt 0.0815 http://www.pandikas.ee/kool/r134a/propertiesR134a.jpg [Broken] Available heat source is 70C and cooling 20C The evaporator needs to be of X size, the Condenser needs to be of X size and I am sorry to say the turbine size isn't preset either - they just have to be big enough. No real idea on how to go a bout it. Now, working with handy materials I figured the standard 2.54cm coiled copper tube will do nicely as evaporator emerged in the 70C water. This assumption gives me the force value of 1072.91 kg*m/s - the other values I dare not to put down in here as they seem way too unrealistic... Could someone just guide me to right direction on how to go about those multiple problems I've encountered here? Br, J My previous work can be found in attachment area.