| Organic rankine cycles (ORC) with turbocompounding harness the waste heat from an internal combustion engine (ICE) to improve efficiency and fuel economy while reducing brake-specific emissions. A mathematical model was developed to explore the potential gains in 1st and 2 nd law efficiencies from a practical and theoretical approach. The two approaches were compared with each other and correlated well. This analysis was conducted for R113, a dry fluid, and propane, a wet fluid, in order to analyze the differences in the two types of fluids. R113 showed a 13%--22% and a 6%--14.7% increase in 1st and 2nd law efficiencies, respectively. Propane showed a 9%--17.4% and a 2%--8.5% increase in 1st and 2nd law efficiencies, respectively. It was also shown that as the pinch point temperature decreases the 2 nd law efficiencies increased. The use of ORC with turbocompounding is an effective manner to improve engine efficiency. |
