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Lookup NU author(s): Dr ChunWee Ng, Dr Ivan CK TamORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Recent regulatory developments in the global maritime industry have signalled an increased emphasis on the improvement of energy efficiency onboard ships. Among the various efficiency enhancement options, recovering waste heat using the organic Rankine cycle (ORC) has been studied and identified as a promising one in many earlier studies. In this paper, a marine application of ORC for waste heat recovery will be discussed by performing the first law thermodynamic analysis based on the operating profile and machinery design data of an offshore service vessel (OSV) and defining four standard cycle configurations that include simple, recuperated, dual heat source, and with intermediate heating. The use of five hydrocarbon working fluids that are suitable for shipboard usage comprising cyclopentane, n-heptane, n-octane, methanol and ethanol are examined. The economic analysis found that annual fuel saving between 5% and 9% is possible and estimated a specific installation cost of $5000–8000 USD/kW. Among the various options, the methanol ORC in a simple cycle configuration is found to have the shortest payback time relatively balancing between annual fuel saving and total module cost. Finally, the simple cycle ORC running on methanol is further examined using the second law entropy generation analysis and it is found that the heat exchangers in the system accounted for nearly 95% of the overall entropy generation rate and further work is recommended to reduce this in the future.
Author(s): Ng CW, Tam ICK, Wu D
Publication type: Article
Publication status: Published
Journal: Journal of Marine Science and Engineering
Year: 2020
Volume: 8
Issue: 5
Pages: 13
Print publication date: 28/05/2020
Online publication date: 14/05/2020
Acceptance date: 05/05/2020
Date deposited: 28/05/2020
ISSN (print): 2077-1312
ISSN (electronic): 2077-1312
Publisher: MDPI AG
URL: https://doi.org/10.3390/jmse8050351
DOI: 10.3390/jmse8050351
Notes: Special Issue "Solutions for Reducing the Environmental Impact of Marine Energy Systems" A special issue of Journal of Marine Science and Engineering (ISSN 2077-1312). This special issue belongs to the section "Ocean Engineering".
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