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Publication Title | Waste Heat Recovery for Commercial Vehicles with a Rankine Process

Organic Rankine Cycle

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21st Aachen Colloquium Automobile and Engine Technology 2012 1

Waste Heat Recovery for Commercial Vehicles with a Rankine Process

Dieter Seher, Thomas Lengenfelder, Jürgen Gerhardt, Nadja Eisenmenger, Michael Hackner, Ilona Krinn

Robert Bosch GmbH, Stuttgart, Germany

Summary

In today’s commercial vehicles the heat of exhaust gas and exhaust gas recirculation is emitted as waste heat to the environment. Using a Rankine process, a part of this energy can be converted into mechanical power for usage in the vehicle. Thus fuel consumption and CO2 emission can be reduced. The two most promising expansion machine concepts, turbine and piston machine are analyzed by simulation and experiment using water as a working fluid. Different working fluids are compared by stationary simulation. The conclusion of this simulation is that the most favourable solutions are a piston machine with water or ethanol as working fluid or a turbine with ethanol as working fluid.

1 Introduction

Diesel engines for heavy duty commercial vehicles (HCV) convert in average only approximately 40% of the primary energy into mechanical power. The residual part is released to the environment. The heat of the exhaust gas can be converted into mechanical power for the vehicle by applying a thermodynamic process. A suitable process is the Rankine process.

Research on organic Rankine processes for waste heat utilization in the industry is already reported about in [1]. Applications in combination with combustion engines are discussed in [2]. Due to the low oil prices three decades ago, these approaches were not broadly industrialized. Today waste heat recovery can be an attractive approach to reduce fuel consumption and operating costs. Additionally, the CO2 emission can be lowered accordingly.

A central component of the process is the expansion machine. The paper at hand compares a piston machine and a turbine for different working fluids on the basis of stationary simulations. Experimental results with the working fluid water are described.

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