Performance Analysis of Refrigeration-Organic Rankine Cycle Dual System with Respect to Deep Seawater Temperature

Abstract

This study proposes ‘Refrigeration-OTEC(Ocean Thermal Energy Conversion) Dual System’ which is combined refrigeration system with ocean thermal energy conversion system by applying ejector. Compressor discharge gas as motive fluid of ejector makes pressure of turbine outlet decrease which is on ejector suction side while passing through the ejector. Moreover, to apply sub-cooling heat exchanger has benefits such as sub-cooling degree in refrigeration cycle and obtaining partial evaporating heat from refrigeration cycle in generation cycle. In this study, comparison anlaysis was conducted to find proper working fluid which satisfy both refrigeration system and thermal energy conversion system. R227ea, R152a, R134a, R717, R218, R22 and R32 were analyzed as working fluids with consideration of evaporation pressure at -15oC, safety group, ODP and use in general.