Design and Thermodynamic Analysis of Hybrid Tri-generation Gas Engine-Organic Rankine Cycle

Abstract >> In a gas engine, the exhaust and the engine cooling water are generated. The engine cooling water temperature is 100 ℃ and the exhaust temperature is 500 ℃. The amount of heat of engine cooling water is43 kW and the amount of heat of exhaust is 21 kW. Eight different hybrid organic Rankine cycle (ORC) systemconfigurations which considering different amount and temperature of waste heat are proposed for two gas enginetri-generation system and are thermodynamically analyzed. Simple system which concentrating two different wasteheat on relatively low temperature engine cooling water shows highest thermal efficiency of 7.84% with pressureratio of 3.67 and shaft power of 5.17 kW. Key words : Gas engine(가스 엔진), Engine exhaust(엔진 배기), Organic Rankine cycle(유기랭킨사이클), Hybridsystem(하이브리드 시스템), Thermodynamic analysis(열역학적 분석) † Corresponding author : kckim@pusan.ac.kr Received : 2015.01.02 in revised form 2015.01.24 Accepted: 2015.02.28Copyright ⓒ 2015 KHNES Nomenclature h : enthalpy (kJ/kg)η : efficiency

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