Selecting an Expansion Machine for Vehicle Waste-Heat Recovery Systems Based on the Rankine Cycle

Latz, Gunnar; Munch, Karin

doi:10.4271/2013-01-0552

Cited by 16 publications

(11 citation statements)

References 17 publications

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“…However, oil-free expanders exist, but they suffer from high leakages. In addition, reciprocating expanders, particularly the reciprocating piston expanders, are usually bulkier and heavier [162].…”

Section: Performance Of Positive Displacement Expandersmentioning

confidence: 99%

Expander Technologies for Automotive Engine Organic Rankine Cycle Applications

Alshammari

Karvountzis-Kontakiotis

Pesyridis

et al. 2018

Energies

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The strive towards ever increasing automotive engine efficiencies for both diesel and gasoline engines has in recent years been forced by ever-stringent emissions regulations, as well as the introduction of fuel consumption regulations. The untapped availability of waste heat in the internal combustion engine (ICE) exhaust and coolant systems has become a very attractive focus of research attention by industry and academia alike. Even state of the art diesel engines operating at their optimum lose approximately 50% of their fuel energy in the form of heat. As a result, waste heat recovery (WHR) systems have gained popularity as they can deliver a reduction in fuel consumption and associated CO2 emissions. Of these, the Organic Rankine Cycle (ORC) is a well matured waste heat recovery technology that can be applied in vehicle powertrains, mainly due to the low additional exhaust backpressure on the engine and the potential opportunity to utilize various engine waste heat sources. ORCs have attracted high interest again recently but without commercial exploitation as of today due to the significant on-cost they represent to the engine and vehicle. In ORCs, expansion machines are the interface where useable power production takes place; therefore, selection of the expander technology is directly related to the thermal efficiency of the system. Moreover, the cost of the expander-generator units accounts for the largest proportion of the total cost. Therefore, selection of the most appropriate expander is of great importance at the early stage of any automotive powertrain project. This study aims to review the relevant research studies for expansion machines in ORC-ICE applications, analyzing the effects of specific speed on expander selection, exploring the operational characteristics of each expander to further assist in the selection of the most appropriate expander, and comparing the costs of various expanders based on publically available data and correlations.

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Section: Performance Of Positive Displacement Expandersmentioning

confidence: 99%

Expander Technologies for Automotive Engine Organic Rankine Cycle Applications

Alshammari

Karvountzis-Kontakiotis

Pesyridis

et al. 2018

Energies

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“…Several studies have been carried out in order to choose the correct expansion machine for Rankine based recovery system [34,35]. In most of them where vehicle installation is considered, turbine expanders are preferred for their compactness and their good performance [8,36] since the major advantage of volumetric expander such as piston machines is the expansion ratio [37].…”

Section: Expansion Machinementioning

confidence: 99%

Transient performance evaluation of waste heat recovery rankine cycle based system for heavy duty trucks

Grelet

Reiche²,

Lemort

et al. 2016

Applied Energy

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The study presented in this paper aims to evaluate the transient performance of a waste heat recovery Rankine cycle based system for a heavy duty truck and compare it to steady state evaluation. Assuming some conditions to hold, simple thermodynamic simulations are carried out for the comparison of several fluids. Then a detailed first principle based model is also presented. Last part is focused on the Rankine cycle arrangement choice by means of model based evaluation of fuel economy for each concept where the fuels savings are computed using two methodologies. Fluid choice and concept optimization are conducted taking into account integration constraints (heat rejection, packaging . . . ). This paper shows the importance of the modeling phase when designing WHRS and yields a better understanding when it comes to a vehicle integration of a Rankine cycle in a truck.

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“…In modern on-road heavy-duty vehicles, about 40-42% of the total fuel energy consumed in the engine is utilized to generate useful work while the rest of the energy is lost in the form of heat and friction (Talus et al, 2011). For typical heavy-duty diesel engines, experimental results have shown that most of the input energy from the fuel is discharged in the form of heat to the ambient air (Latz et al, 2013).…”

Section: Heavy-duty Engine Energy Flowmentioning

confidence: 99%

Investigating the Potential of Waste Heat Recovery as a Pathway for Heavy-Duty Exhaust Aftertreatment Thermal Management

Pradhan

2015

SAE Technical Paper Series

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Investigating the Potential of Waste Heat Recovery as a Pathway for Heavy-Duty Exhaust Aftertreatment Thermal Management Saroj Pradhan Heavy-duty diesel (HDD) engines are the primary propulsion source for most heavy-duty vehicle freight movement and have been equipped with an array of aftertreatment devices to comply with more stringent emissions regulations. In light of concerns about the transportation sector's influence on climate change, legislators are introducing requirements calling for significant reductions in fuel consumption and thereby, greenhouse gas (GHG) emission over the coming decades. Advanced engine concepts and technologies will be needed to boost engine efficiencies. However, increasing the engine's efficiency may result in a reduction in thermal energy of the exhaust gas, thus contributing to lower exhaust temperature, potentially affecting after-treatment activity, and consequently emissions rate of regulated pollutants. iii TABLE OF CONTENTS CHAPTER 1 INTRODUCTION .

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Selecting an Expansion Machine for Vehicle Waste-Heat Recovery Systems Based on the Rankine Cycle

Cited by 16 publications

References 17 publications

Expander Technologies for Automotive Engine Organic Rankine Cycle Applications

Expander Technologies for Automotive Engine Organic Rankine Cycle Applications

Transient performance evaluation of waste heat recovery rankine cycle based system for heavy duty trucks

Investigating the Potential of Waste Heat Recovery as a Pathway for Heavy-Duty Exhaust Aftertreatment Thermal Management

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