Hydrogen extraction from a new integrated trigeneration system working with zeotropic mixture, using waste heat of a marine diesel engine Milad Feili, Hadi Rostamzadeh, Towhid Parikhani, Hadi Ghaebi * Department of Mechanical Engineering, Faculty of Engineering, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran highlights  A novel trigeneration system working with waste heat of the MDE is devised.  The devised system produces electricity and cooling at two temperature levels.  Different zeotropic mixtures are used as working fluid. article info Article history: Received 11 March 2020 Received in revised form 29 April 2020 Accepted 22 May 2020 Available online xxx Keywords: Hydrogen production Waste heat Marine diesel engine (MDE) Bi-evaporator Zeotropic mixture abstract Hydrogen can be used for various applications in ships, but two distinctive places are the combustion processes of the marine diesel engine (MDE) or aircrafts fuelled by aircraft carriers (especially, for long-range transportations applications). For this aim, an integrated trigeneration system working with waste heat of the MDE for mainly hydrogen extraction is proposed here. In addition to hydrogen, the devised trigeneration system can produce surplus electricity and cooling at two different temperature levels. Different zeotropic mixtures are used as working fluid and their performance metrics were compared with each other. It is worthy to say that the simulated basic cooling/electricity system is new and is accounted for as another novelty of the present work. A comprehensive modeling of the proposed trigeneration system is achieved from thermodynamics laws viewpoint and results are elaborated in detail. Based upon the results, the maximum refrigeration load and trigeneration energy efficiency are calculated 166.36 kW and 42.46%, respectively, when R142b/Pentane (0.51/0.49) was used. However, to achieve lower overall exergy destruction, Butene/Isopentane (0.35/0.65) was recommended. Also, the highest trigener- ation exergy efficiency is associated with Butene/Isopentane (0.35/0.65) by 18.71%, followed by Isobutene/Isopentane (0.34/0.66) by 18.53%. It is found that the auxiliary vapor generator has the highest exergy destruction by 61.5 kW, followed by ejector by 19.5 kW. At last, an intensive parametric study is also presented to propose some solution for performance enhancement of the system based on the thermodynamics parameters. © 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. * Corresponding author. E-mail address: hghaebi@uma.ac.ir (H. Ghaebi). Available online at www.sciencedirect.com ScienceDirect journal homepage: www.elsevier.com/locate/he international journal of hydrogen energy xxx (xxxx) xxx https://doi.org/10.1016/j.ijhydene.2020.05.208 0360-3199/© 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. Please cite this article as: Feili M et al., Hydrogen extraction from a new integrated trigeneration system working with zeotropic mixture, using waste heat of a marine diesel engine, International Journal of Hydrogen Energy, https://doi.org/10.1016/ j.ijhydene.2020.05.208