Investigation of a Dual-Loop ORC for the Waste Heat Recovery of a Marine Main Engine

Long Lyu, Wu Chen (), Ankang Kan (), Yuan Zhang, Song Xue and Jingbin Zeng
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Long Lyu: Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China
Wu Chen: Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China
Ankang Kan: Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China
Yuan Zhang: Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China
Song Xue: Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China
Jingbin Zeng: Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China

Energies, 2022, vol. 15, issue 22, 1-22

Abstract: As carbon dioxide emissions arising from fossil energy consumption and fossil fuels are gradually increased, it is important for the low-carbon operation of ships to recover diesel engine waste heat. A newly developed dual-loop organic Rankine cycle (ORC) system to recover waste heat from a marine main engine (M/E) was designed in this paper. The exhaust gas (EG) heat was recovered by the high-temperature (HT) loop. The jacket cooling water (JCW) heat and the condensation heat of the HT loop were recovered by the low-temperature (LT) loop. Toluene, cyclohexane, benzene, R1233zd (E), R245fa, and R227ea were selected as the working fluids. The influence of the condenser thermal parameters on the LT loop was analyzed using the pinch point method. The performance of the dual-loop ORC was investigated under various working fluid combinations. The maximum net power of the HT loop can reach 253.4 kW when using cyclohexane as the working fluid, and the maximum thermal efficiency of the HT loop can reach 18.5% with benzene as the working fluid. Meanwhile, higher condensation temperatures and levels of condensation heat of the HT loop have a positive effect on the performance of the LT loop. However, in most conditions, the HT loop condensation heat could not provide enough heat for the LT loop’s working fluid to start the boiling process. The total net power of the dual-loop ORC system was 410.6 kW with Cyclohexane in the HT loop and R1233zd (E) in the LT loop, resulting in a 10.9% improvement in the marine main engine thermal efficiency.

Keywords: marine main engine waste heat; organic Rankine cycle; dual loop; working fluid; net power (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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