Performance improvement of combined organic Rankine-vapor compression cycle using serial cascade evaporation in the organic cycle

This paper describes an improvement solution for ORC-VCC systems. The solution consists in using cascade evaporation in the ORC subsystem in order to increase its power on the expander shaft. The heat source is divided into high temperature and low temperature ranges, a solution allowing the utilization of all kinds of heat sources which are at different temperature levels. The paper also discusses performance of hydrocarbon refrigerants in such systems. The performance of the system using a cascade evaporation in the ORC subsystem are compared to those using a basic ORC subsystem