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

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