Potential of carbon dioxide transcritical power cycle waste-heat recovery systems for heavy-duty truck engines

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Title: Potential of carbon dioxide transcritical power cycle waste-heat recovery systems for heavy-duty truck engines
Authors: Li, X
Tian, H
Shu, G
Zhao, M
Markides, C
Hu, C
Item Type: Journal Article
Abstract: Carbon dioxide transcritical power cycle (CTPC) systems are considered a new and particularly interesting technology for waste-heat recovery. In heavy-duty truck engine applications, challenges arise from the highly transient nature of the available heat sources. This paper presents an integrated model of CTPC systems recovering heat from a truck diesel engine, developed in GT-SUITE software and calibrated against experimental data, considers the likely fuel consumption improvements and identifies directions for further improvement. The transient performance of four different CTPC systems is predicted over a heavy-heavy duty driving cycle with a control structure comprising a mode switch module and two PID controllers implemented to realize stable, safe and optimal operation. Three operating modes are defined: startup mode, power mode, and stop mode. The results demonstrate that CTPC systems are robust and able to operate safely even when the heat sources are highly transient, indicating a promising potential for the deployment of this technology in such applications. Furthermore, a system layout with both a preheater and a recuperator appears as the most promising, allowing a 2.3% improvement in brake thermal efficiency over the whole driving cycle by utilizing 48.9% of the exhaust and 72.8% of the coolant energy, even when the pump and turbine efficiencies are as low as 50%. Finally, factor analysis suggests that important directions aimed at improving the performance and facilitating CTPC system integration with vehicle engines are: 1) ensuring long-duration operation in power mode, e.g., by employment in long-haul trucks; and 2) enhancing pump and turbine performance.
Issue Date: 15-Sep-2019
Date of Acceptance: 5-May-2019
URI: http://hdl.handle.net/10044/1/69718
DOI: https://dx.doi.org/10.1016/j.apenergy.2019.05.082
ISSN: 0306-2619
Publisher: Elsevier
Start Page: 1581
End Page: 1599
Journal / Book Title: Applied Energy
Volume: 250
Copyright Statement: © 2019 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/P004709/1
Keywords: 09 Engineering
14 Economics
Energy
Publication Status: Published
Embargo Date: 2020-05-17
Online Publication Date: 2019-05-17
Appears in Collections:Faculty of Engineering
Chemical Engineering



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