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Selection of cooling fluid for an organic Rankine cycle unit recovering heat on a container ship sailing in the Arctic region

de la Fuente, SS; Larsen, U; Pierobon, L; Kærn, MR; Haglind, F; Greig, A; (2017) Selection of cooling fluid for an organic Rankine cycle unit recovering heat on a container ship sailing in the Arctic region. Energy , 141 pp. 975-990. 10.1016/j.energy.2017.09.125. Green open access

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Abstract

As Arctic sea ice coverage declines it is expected that marine traffic could increase in this northern region due to shorter routes. Navigating in the Arctic offers opportunities and challenges for waste heat recovery systems (WHRS). Lower temperatures require larger heating power on board, hence a larger demand for waste heat usage, to cover services and maintaining on board spaces temperatures. However, a lower heat rejection temperature increases the WHRS thermal efficiency. The air temperature for the Arctic route selected is colder than that of the seawater, opening the opportunity of having air as coolant. This paper explores the use of two different coolants, air and seawater, for an organic Rankine cycle (ORC) unit using the available waste heat in the scavenge air system of a container ship navigating in Arctic Circle. Using a two-step single objective optimisation process, detailed models of air and seawater heat exchangers are evaluated as the WHRS condensers. The results suggest that an ORC unit using R1233zd(E) as its working fluid coupled with seawater as its coolant is the preferable option to reduce CO2 emissions. Using the ambient air as the coolant while a less effective option could be cheaper to install.

Type: Article
Title: Selection of cooling fluid for an organic Rankine cycle unit recovering heat on a container ship sailing in the Arctic region
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.energy.2017.09.125
Publisher version: https://doi.org/10.1016/j.energy.2017.09.125
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Organic Rankine cycle; Arctic shipping; Waste heat recovery; Condensers; CO2 emissions
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/1575664
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