ORC용 스크롤 팽창기 설계

Low-grade heat is frequently encountered as a by-product in industrial processes. However, waste heat recovery is generally considered to be a technologically challenge and is rarely economically viable. One possible way of increasing the use of low-grade heat is to utilize Rankine cycle in order to convert low-grade heat to high-grade quality energy such as electricity. This paper addresses a shaft power generation by using a scroll expander in an organic Rankine cycle with R134a as a working fluid, where heat is supplied from an engine coolant. Design practice of a scroll expander has been carried out for 1.5 ㎾ power output, and the expander performance has been analyzed by numerical simulation.