Abstract
In this study, a multi-stage thermal cycle was designed to recover the LNG cold energy and the waste heat from the LNG fuelled ship. In the low temperature cycle, the LNG cold energy was used as the heat sink and the jacket cooling water of the main engine was used as the heat source. And in the high temperature cycle, the LNG cold energy and the exhaust gas were used as the heat sink and the heat sources, respectively. Seven types of working fluids were used for constituting the multi-stage thermal cycle. The multi-stage thermal cycle was analyzed by calculating the net power, thermal efficiency, exergy efficiency, and cold thermal efficiency. It was found that the R152a-hexane combination had the highest net power of 626.3kW, thermal efficiency of 20.5%, exergy efficiency of 29.1% and cold thermal efficiency of 23.3%.
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