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Numerical study of using different Organic Rankine cycle working fluids for engine coolant energy recovery

Lookup NU author(s): Dr Yiji Lu, Professor Tony Roskilly

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


Abstract

Engine waste heat recovery technology especially Organic Rankine cycle (ORC) has been widely studied in order to achieve higher overall thermal efficiency, reduce the engine emissions and improve the fuel economy. The coolant energy occupies around 30% of the fuel energy can be used as the heat source for ORC system. This paper studies thermal status of the engine heated components when using different ORC working fluids as engine coolant to avoid the heat loos using heat exchanger to transfer coolant to the ORC fluid. A Solid-Liquid Conjugated Heat Transfer (SLCHT) calculation method is developed to calculate the heat transfer inside the engine, which can solve the temperature field of both solid zone and fluid zone. The simulation results have been validated by the experimental data from a 6-cylinder medium duty diesel engine, when water is the coolant in the system. The simulation model is then used to predict the temperature profile using different ORC working fluids and investigate the influence of different ORC working fluids on the cooling effects of the engine heated parts. The maximum temperature of the heated components has been selected as the evaluation parameters. The results reveals that applying selected ORC working fluids in engine as coolant is not practical under the designed conditions, which will make the engine overheated. Further investigation showed that increasing mass flow rate of the coolant can decrease the thermal status of the heated components but still cannot meet the cooling demands even under 200% of the original mass flow rate. The variations of the coolant outlet temperature and exergy were also analysed.


Publication metadata

Author(s): Chen FF, Lu YJ, Chen XQ, Li Z, Yu XL, Roskilly AP

Publication type: Article

Publication status: Published

Journal: Energy Procedia

Year: 2017

Volume: 142

Pages: 1448-1454

Print publication date: 01/12/2017

Online publication date: 31/01/2018

Acceptance date: 02/04/2016

ISSN (electronic): 1876-6102

Publisher: Elsevier BV

URL: https://doi.org/10.1016/j.egypro.2017.12.533

DOI: 10.1016/j.egypro.2017.12.533

Notes: 9th International Conference on Applied Energy


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