Oil-Free Axial Piston Expander for Waste Heat Recovery

Daccord, Rémi; Darmedru, Antoine; Melis, Julien

doi:10.4271/2014-01-0675

Cited by 11 publications

(16 citation statements)

References 4 publications

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“…The following year, Daccord et al [155] studied the influences of utilizing axial piston expanders on the performance of an ORC used in waste heat recovery. The authors employed the exhaust gas of a 1.6 L gasoline engine as the heat source.…”

Section: Piston 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: Piston Expandersmentioning

confidence: 99%

Expander Technologies for Automotive Engine Organic Rankine Cycle Applications

Alshammari

Karvountzis-Kontakiotis

Pesyridis

et al. 2018

Energies

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“…In this case, since these parameters have been obtained by performing a calibration starting from experimental data, it is harder to fully characterize their variability. For this reason, concerning the uncertainty on calibration parameters, we consider a ±0.01 variation based on some experimental evidence [14], which should provide a first estimation about the potential influence of the uncertainty on these parameters. Future studies should consider a larger variation, or solving the whole problem by means of Bayesian-based approaches.…”

Section: Uncertainty Assessment and Design Variablesmentioning

confidence: 99%

“…Some works [8] have been devoted to the design of an ORC facility for waste heat recovery in IC engines. Several studies [9,10,11,13,14,15] suggested the use of a piston expander for exhaust heat recovery (EHR). In [12], they tested an axial piston expander and calibrated a semi-empirical model.…”

Section: Introductionmentioning

confidence: 99%

Numerical characterization under uncertainties of a piston expander for exhaust heat recovery on heavy commercial vehicles

Congedo

Melis²,

Daccord³

2017

J. Phys.: Conf. Ser.

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“…expansion ratio, expander speed and outlet pressure of the expander. For each boiler power (5,12,20, and 25 kW) two different outlet expander pressures were tested.…”

Section: Sensitivity Analysismentioning

confidence: 99%

“…Thus, waste heat recovery technologies seem to assume an essential role in the new regulations of the forthcoming decade [4], [5]. Since the invention of ICE, there have been some attempts to increase the effective power using Waste Heat Recovery sources (Coolant and Exhaust Gases).…”

Section: Introductionmentioning

confidence: 99%