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Open AccessArticle

Engine Load Effects on the Energy and Exergy Performance of a Medium Cycle/Organic Rankine Cycle for Exhaust Waste Heat Recovery

State Key Laboratory of Engines, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China
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Entropy 2018, 20(2), 137; https://doi.org/10.3390/e20020137
Received: 10 December 2017 / Revised: 3 February 2018 / Accepted: 12 February 2018 / Published: 21 February 2018
(This article belongs to the Special Issue Work Availability and Exergy Analysis)
The Organic Rankine Cycle (ORC) has been proved a promising technique to exploit waste heat from Internal Combustion Engines (ICEs). Waste heat recovery systems have usually been designed based on engine rated working conditions, while engines often operate under part load conditions. Hence, it is quite important to analyze the off-design performance of ORC systems under different engine loads. This paper presents an off-design Medium Cycle/Organic Rankine Cycle (MC/ORC) system model by interconnecting the component models, which allows the prediction of system off-design behavior. The sliding pressure control method is applied to balance the variation of system parameters and evaporating pressure is chosen as the operational variable. The effect of operational variable and engine load on system performance is analyzed from the aspects of energy and exergy. The results show that with the drop of engine load, the MC/ORC system can always effectively recover waste heat, whereas the maximum net power output, thermal efficiency and exergy efficiency decrease linearly. Considering the contributions of components to total exergy destruction, the proportions of the gas-oil exchanger and turbine increase, while the proportions of the evaporator and condenser decrease with the drop of engine load. View Full-Text
Keywords: Medium Cycle/Organic Rankine Cycle (MC/ORC); waste heat recovery; engine load effect; stationary CNG engine; exergy analysis Medium Cycle/Organic Rankine Cycle (MC/ORC); waste heat recovery; engine load effect; stationary CNG engine; exergy analysis
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Liu, P.; Shu, G.; Tian, H.; Wang, X. Engine Load Effects on the Energy and Exergy Performance of a Medium Cycle/Organic Rankine Cycle for Exhaust Waste Heat Recovery. Entropy 2018, 20, 137.

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