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

Santiago Suárez de la Fuente, Ulrik Larsen, Leonardo Pierobon, Martin Ryhl Kærn, Fredrik Haglind, Alistair Greig

Research output: Contribution to journalJournal articleResearchpeer-review

102 Downloads (Pure)

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.
Original languageEnglish
JournalEnergy
Volume141
Pages (from-to)975-990
ISSN0360-5442
DOIs
Publication statusPublished - 2017

Keywords

  • Arctic shipping
  • CO2 emissions
  • Condensers
  • Organic Rankine cycle
  • Waste heat recovery

Fingerprint Dive into the research topics of 'Selection of cooling fluid for an organic Rankine cycle unit recovering heat on a container ship sailing in the Arctic region'. Together they form a unique fingerprint.

Cite this