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Concept for energy recovery in city buses based on organic Rankine cycle system

Pałczyński T.

Transactions of the Institute of Fluid-Flow Machinery

2016

nr 131

131--150

This paper presents a concept for energy recovery in city buses, based on organic Rankine cycle (ORC) system modeling. ORC modeling provides preliminary parameters which enable estimation of transient state energy ﬂow, especially at those points in the system where it can mostly easily be recovered (exhaust, cooling and brakes). The paper describes an easy-to-use procedure for time-domain analysis of velocity waves in a real driving cycle. The results were combined with a dynamic system model of a city bus in block diagram environment, taking into account the inﬂuence of parameters assumed to have the greatest impact on the model’s accuracy. Average fuel consumption and producer speciﬁcations (maximum vehicle speed, rate of acceleration) were used as reference parameters. A procedure was developed for tuning the simulation model according to the reference parameters. The results of the simulation, based on real measurements of Lodz city traﬃc parameters, are discussed and an estimate is made of the potential for energy recovery in city buses.