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Making shipping greener: A vessel’s waste heat recovery system comparative study between organic fluids and water

Greig, AR; Suárez de la Fuente, S; (2015) Making shipping greener: A vessel’s waste heat recovery system comparative study between organic fluids and water. Journal of Marine Engineering & Technology , 14 (2) pp. 70-84. 10.1080/20464177.2015.1077601. Green open access

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Making shipping greener comparative study between organic fluids and water for Rankine cycle waste heat recovery (final with images).docx - Accepted version

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Abstract

The largest source of energy loss in a ship is found in the propulsion system. This study focuses on the concept of managing waste heat energy from the exhaust gas. Using waste heat recovery systems to make shipping more efficient represents a good area of opportunity for achieving the shipping industry’s green objectives. Organic Rankine Cycles (ORC) have been applied in land based systems before, showing improvements in performance when compared with the traditional Rankine cycle (RC). ORC plants on board ships face different challenges such as variable operating conditions and limited space. As marine environmental rules require greener vessels and engine thermal efficiency continue to increase, ORC waste heat recovery systems become a more attractive option. The proposed waste heat recovery system (WHRS) was modelled using Matlab with a typical ship installation with a slow speed diesel engine and the WHRS installed after the turbo compressors in the exhaust gas system. The energy recovered from the exhaust gas flow is transformed via the thermodynamic cycle into electricity which will help to cover the ship’s demand. The Matlab code found the highest electric power output varying the WHRS high pressure, maximizing the fuel and CO2 emission reductions. Water and various organic fluids were considered as working fluids and their performance compared over a range of different engine operating scenarios in order to assess the differences between a marine ORC and RC. A representative ship operating profile and a typical marine generator were used to measure CO2 emission reductions and the implications of having flammable organic fluids on-board. This work demonstrates that a simple ORC can be more effective than water based RC for the same engine operating conditions

Type: Article
Title: Making shipping greener: A vessel’s waste heat recovery system comparative study between organic fluids and water
Location: UK
Open access status: An open access version is available from UCL Discovery
DOI: 10.1080/20464177.2015.1077601
Publisher version: http://dx.doi.org/10.1080/20464177.2015.1077601
Language: English
Additional information: This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Marine Engineering & Technology on November 2015, available online: http://wwww.tandfonline.com/10.1080/20464177.2015.1077601
Keywords: Waste heat recovery, Organic rankin cycle, Marine engineering, Ships
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment > Bartlett School Env, Energy and Resources
URI: https://discovery.ucl.ac.uk/id/eprint/1473454
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