Performance Comparison between Thermal Energy Conversion System Applying Single-ejector and Dual-ejector

Abstract

A lot of researches on ocean energy have conducted to relieve environmental problems which may occur during generation process of electricity. Especially, a thermal energy conversion system which generates electricity with temperature difference between heat source and heat sink has been focused throughout the world. To improve system efficiency of thermal energy conversion systems, single-ejector and dual-ejector are applied in this study. In heat source of 70℃ and heat sink of 26℃ condition, dual ejector-pump system shows system efficiency of 9.1%, relatively 33% increased value than basic system. Meanwhile, system efficiency of dual ejector-pump system is 12.3%. That is, application of dual ejectors brings about enhancement of 35% in system efficiency compared to that of single ejector-pump system. In conclusion, using dual ejectors leads system efficiency to increases although it results in more pump work input from motive pumps.