Thermodynamic Performance Analysis of a Cogeneration System in Series Circuit Using Regenerative ORC

>> This paper presents the analytical results of the thermodynamic performance characteristics for a cogeneration system using regenerative organic Rankine cycle (ORC) driven by low-grade heat source. The combined heat and power cogeneration system consists of a regenerative superheated ORC and an additional process heater in a series circuit. Eight working fluids of R134a, R152a, propane, isobutane, butane, R245fa, R123, andisopentane are considered for the analysis. Special attention is paid to the effect of turbine inlet pressure on thesystem performance such as thermal input, net power and useful heat productions, electrical, thermal, and systemefficiencies. The results show a significant effect of the turbine inlet pressure and selection of working fluid onthe thermodynamic performance of the system.Key words : ORC(), Combined heat and power(CHP, ), Series circuit(), Working fluid(), Thermodynamic performance( ) † Corresponding author : manhoe.kim@knu.ac.kr