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Proposing a new tri-generation cycle based on utilizing organic fluid mixtures for waste heat recovery of a diesel engine.
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Hadi Ghaebi *1   , Milad Fili2 |
1- Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran , hghaebi@uma.ac.ir
2- Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran |
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Abstract: (7 Views) |
This study proposes a new tri-generation system to recover waste heat from marine diesel engine exhaust gases. This system combines the organic Rankine cycle, ejector refrigeration, and heat pump to simultaneously produce electrical power, cooling, and heating for the ship's crew. Unlike conventional systems that use pure fluids, zeotropic mixtures are employed to enhance the system's performance by increasing temperature matching in heat exchangers. The results are examined from the first law of thermodynamics perspective, and parametric studies are conducted to understand the system's behavior with different input parameters. The results of various mixtures indicate that the R142b/Pentane mixture has the highest power production, the Isopentane/Pentane mixture has the highest cooling capacity, and the R236ea/Pentane mixture has the highest heating capacity, with values of 27.2 kW, 53 kW, and 5.68 kW, respectively. Energy efficiency, as calculated for different mixtures based on the first law of thermodynamics, reveals that the R142b/Pentane, Isobutane/Pentane, and R236fa/Pentane mixtures have the highest efficiencies, measuring 31.62%, 31.46%, and 29.57%, respectively.
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| Keywords: Weast heat recovery, Zeotropic mixture, tri-generation, Marine diesel engine |
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Type of Study: Research |
Subject:
Thermodynamics
Received: 2026/08/18 | Accepted: 2026/09/24
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