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Making shipping greener: ORC modelling under realistic operative conditions

Suarez De La Fuente, Santiago; (2013) Making shipping greener: ORC modelling under realistic operative conditions. In: Smith, Tristan, (ed.) Proceedings of the Low Carbon Shipping Conference 2013. Low Carbon Shipping & Shipping in Changing Climates: London, UK. Green open access

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Abstract

The predictions of CO2 atmospheric concentrations by 2050 are between 480 ppm to 550 ppm with a corresponding increase in global temperatures from 0.5 to 2.5°C. Shipping contributes 3.3% of the total human CO2 emissions. It is therefore important to start generating green and intelligent solutions based on new strategies and technologies, which would help follow a green agenda in shipping. The largest source of energy loss in a ship is 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 from an academic and industrial perspective. Organic Rankine Cycles (ORC) have been applied in land based systems before, showing improvements in performance when compared with traditional Rankine cycle. However, the use of ORC in ships has been limited, offering an important area of opportunity to be considered. The proposed ORC waste heat recovery system was modelled with a typical slow speed diesel engine installed after the turbo compressors in the exhaust gas system. The energy recovered from the exhaust gas flow will be transformed via the thermodynamic cycle into electricity which will help to cover the ship demand. By doing this, there is a reduction in fuel consumption reduction and therefore a decrease in the emissions of CO2 and other greenhouse gases (GHG). A code generated explicitly for this purpose compared the behaviour of different working fluids appropriate for different operative scenarios. With this it is possible to demonstrate that a simple ORC can be more effective than water based Rankine cycle, challenging previous research and common standards for the industry.

Type: Proceedings paper
Title: Making shipping greener: ORC modelling under realistic operative conditions
Event: Low Carbon Shipping Conference, UCL, London, UK, 30 September 2013 (LCS 2013)
Location: London
Open access status: An open access version is available from UCL Discovery
Publisher version: http://www.lowcarbonshipping.co.uk/index.php?optio...
Language: English
Additional information: This version is the version of the record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Organic Rankine Cycle; Waste Heat Recovery Systems; ship system
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 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/1545538
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