ハイフィン熱交換器の性能および実測値に基づく機関室換気からの低温排熱回収の予測

抄録

International marine shipping aims to achieve carbon neutrality by 2050. Marine vessels generate a large amount of waste heat, particularly low-grade waste heat, which remains unutilized. And high -temperature water and steam have been mostly generated by boilers and heaters. In this study, engine room ventilation was assumed as a waste heat source and the performance of a copper high-fin heat exchanger, a highly efficient heat exchanger with excellent corrosion resistance for low-grade waste heat recovery was evaluated, accounting for the presence or absence of condensation on the heat transfer tube surface. Based on measurement data, the heat-transfer rate, outlet temperature, and flow rate of the high-temperature water obtained in the condenser were predicted when using a high-fin heat exchanger as the evaporator of a heat pump and recovering waste heat. Furthermore, CO₂ emission reductions were predicted and compared with the generation of high-temperature water using a heavy oil-fired boiler, demonstrating the potential for environmental impact reduction.