이중 팽창기를 적용한 유기랭킨사이클 시스템의 성능특성 연구

This study targets to estimate the performance of an organic Rankine cycle (ORC) power generation system using dual expanders by simulation and experiment. The ORC system is composed of two scroll expanders installed in parallel, a hydraulic diaphragm type pump to pressurize the working fluid, two plate heat exchangers for the evaporator and condenser. The two scroll expanders were converted from two oil-free air scroll compressors with same specifications, and were tested in the ORC loop with R245fa. The heat source temperature was controlled up to 150 °C by the 150 kW-class electric water-heater. In order to evaluate the static performance of the system, efficiencies and shaft powers for both single and dual operation mode were carried out. The maximum isentropic efficiency of each expander was measured about 70 %, and the shaft power was reached to about 3 kW at the turbine inlet temperature of 140 °C. Moreover, the performance characteristics of the dual parallel expanders ORC system with regards to various heat source conditions will be addressed.