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Simulative Investigation of the Influence of a Rankine Cycle Based Waste Heat Utilization System on Fuel Consumption and Emissions for Heavy Duty Utility Vehicles

  • Kangyi YangEmail author
  • Michael Grill
  • Michael Bargende
Conference paper

Abstract

As a promising solution to improve fuel efficiency of a long-haul heavy duty truck with diesel engine, Organic Rankine Cycle (ORC) based waste heat recovery system (WHR) by utilizing the exhaust gas from internal combustion engine has continuously drawn attention from industry in recent years. In this paper, a simulation study has been conducted to investigate the interaction between the internal combustion engine and an ORC based WHR-system with a parallel layout. The exhaust gas recirculation (EGR) energy and the exhaust gas Tailpipe (EGT) energy from the internal combustion engine will be used to vaporize the working fluid of the ORC-WHR system and converted to mechanical energy by employing a turbine-expander which is coupled to engine crankshaft. The truck cooling system will be used to dissipate the rest heat from the condenser of WHR-System to the ambient. The shift of the engine operating point to a lower engine torque level and the changed engine operating conditions by applying the WHR system have a strong influence on the benefit of the fuel efficiency and on the engine emission as well.

This paper aims to evaluate the impacts of the varied engine applications considering the effects of the WHR system on the global efficiency and engine emissions. A complex 0D/1D-simulation model for a turbocharged production 6-cylinder EURO-VI heavy duty engine with low-/high-temperature cooling circuit and a WHR system with ethanol as working fluid have been established in a conventional 1D-simulation software.

Keywords

Organic Rankine Cycle Heavy duty vehicle Simulation 

Nomenclature, Definitions and Abbreviations

α

Convective heat transfer coefficient

BDC

Bottom dead centre

BSFC

Brake specific fuel consumption

\( \varvec{c}_{{\varvec{p},\varvec{exh}}} \)

Specific heat capacity of exhaust gas

e.g.

For example

EGR

Exhaust gas recirculation

EGT

Exhaust gas tailpipe

\( {\varvec{\upeta}}_{{{\mathbf{Carnot}}}} \)

Carnot efficiency

\( {\varvec{\upeta}}_{{{\mathbf{tri}}}} \)

Triangular coefficient

\( {\varvec{\upeta}}_{{\mathbf{v}}} \)

Pump efficiency

GWP

Global Warming Potential

HT-circuit

High temperature coolant circuit

LP-CAC

Low pressure charge air cooler

LT-circuit

Low temperature coolant circuit

\( \dot{\varvec{m}}_{{\varvec{exh}}} \)

Mass flow of exhaust gas

\( {\mathbf{n}} \)

Pump speed

n/a

Not available

NOx

Nitrogen Oxides

ODP

Ozone depletion potential

ORC

Organic Rankine cycle

PID

Proportional-integral-derivative controller

PPTD

Pinch point temperature difference

Pr

Prandtl number

Re

Reynolds number

TC

Heat sink temperature

TH

Heat source temperature

\( {\dot{\mathbf{V}}} \)

Pump volumetric flow

\( {\mathbf{V}}_{{\mathbf{D}}} \)

Pump displacement

WHSC

World Harmonized Stationary Cycle

WHTC

World Harmonized Transient Cycle

Notes

Acknowledgments

The research project was funded by BMWi (German Federal Ministry of Economic Affairs and Energy), due to a decision of the German Bundestag. The authors would like to thank the BMWi for providing financing.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Forschungsinstitut für Kraftfahrwesen und Fahrzeugmotoren Stuttgart - FKFSStuttgartGermany
  2. 2.Institut für Verbrennungsmotoren und KraftfahrwesenStuttgartGermany

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