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Waste Heat Recovery System of Exhaust Gas for Engine Based on Two-stage Organic Rankine Cycle

Yang Fu-bi

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Abstract

According to the characteristics of waste heat from engine exhaust gas,the waste heat recovery system based on two-stage organic Rankine cycle(ORC)was designed and its power was delivered by single screw expanders.Under different evaporation temperatures and expansion ratios,the thermodynamics performance of two-stage ORC system and basic ORC system operated with R245fa medium were analyzed and compared.The results show that the two-stage ORC system has higher thermal efficiency,higher exergy efficiency,lower exergy loss rate and hence a better performance of waste heat recovery.

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What this paper is about

According to the characteristics of waste heat from engine exhaust gas,the waste heat recovery system based on two-stage organic Rankine cycle(ORC)was designed and its power was delivered by single screw expanders.Under different evaporation temperatures and expansion ratios,the thermodynamics performance of two-stage ORC system and basic ORC system operated with R245fa medium were analyzed and compared.The results show that the two-stage ORC system has higher thermal efficiency,higher exergy efficiency,lower exergy loss rate and hence a better performance of waste heat recovery.

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Available abstract

According to the characteristics of waste heat from engine exhaust gas,the waste heat recovery system based on two-stage organic Rankine cycle(ORC)was designed and its power was delivered by single screw expanders.Under different evaporation temperatures and expansion ratios,the thermodynamics performance of two-stage ORC system and basic ORC system operated with R245fa medium were analyzed and compared.The results show that the two-stage ORC system has higher thermal efficiency,higher exergy efficiency,lower exergy loss rate and hence a better performance of waste heat recovery.

Key concepts: Organic Rankine cycle, Waste heat recovery unit, Exhaust gas, Thermal efficiency, Waste heat, Exergy efficiency, Waste management, Exergy

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