Lookup NU author(s): Emmanouil Tsougranis,
Dr Dawei Wu
This is the authors' accepted manuscript of an article that has been published in its final definitive form by John Wiley and Sons Ltd, 2018.
For re-use rights please refer to the publisher's terms and conditions.
© 2018 John Wiley & Sons, Ltd. This study develops a novel approach to reutilize cryogenic and thermal waste energy on a liquefied natural gas (LNG)-powered passenger vessel. The waste energy is identified through a series of field tests of the LNG evaporation system and other important machinery systems, including the main engines, on a case ship. An Organic Rankine Cycle (ORC) power generation system is proposed to work between the LNG boiling temperature of -138°C (at 5 bar) and the waste heat temperature level of 400°C from the main engines' exhaust gas. The proposed ORC system is designed in terms of the field testing data and analyzed through simulation using Siemens LMS Imagine.Lab AMESim. Two different arrangements (single stage and 2 stages) of ORC are energetically, exergically, and economically analyzed. Three optimal working fluids are examined in high vacuum and above atmospheric condensing pressures in the temperature range of -110°C to 300°C. The proposed ORC systems are characterized by a significant improvement in thermal efficiency and power production in high vacuum condensing pressures. The 2-stage ORC presents higher power output and fuel cost saving per year than the single-stage ORC with almost the same payback time. The higher percentage of exergy destruction occurs at the evaporator of the ORC system. The increase in the exergy destruction on the condenser at higher condensing pressures contributes to the decrease of the exergy efficiency of the ORC systems.
Author(s): Tsougranis E-L, Wu D
Publication type: Article
Publication status: Published
Journal: International Journal of Energy Research
Print publication date: 01/07/2018
Online publication date: 24/03/2018
Acceptance date: 08/02/2018
ISSN (print): 0363-907X
ISSN (electronic): 1099-114X
Publisher: John Wiley and Sons Ltd
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