냉동 및 발전 듀얼시스템의 성능특성

Abstract

This study analyzes performance of refrigeration-thermal energy conversion dual system applying ejector with respect to cooling water temperature. The ejector is applied to make turbine gross power increase by helping pressure of the turbine outlet decrease. Motive fluid is operated by pressure difference between motive pressure and discharge pressure, at this moment, the motive fluid brings suction fluid to discharge of ejector. Then, suction pressure will be decreased. Theejector suction side is connected with turbine outlet. Analysis condition is as follows. Surface seawater flows into condenser as cooling water, and evaporation temperature is 20℃. Deep seawater which have 5℃ of temperature flows into condenser for ORC(Organic Rankine Cycle) as cooling water, and heat source which have 75℃ of temperature flows into evaporator for ORC. Mass flow ratio of ejector has 0.5 of fixed value, and sub-cooling degree for refrigeration cycle has10℃ of fixed value. When surface seawater has 20~30℃ of temperature range, COP of refrigeration cycle and efficiency of ORC are as follows. As surface seawater get higher from 20℃ to 30℃, the COP tends to decrease due to pressure difference between condensation pressure and evaporation pressure. While, the efficiency shows 28% higher than basic ORC under same operating condition.