Selection and peer-review under responsibility of the scientific committee of the 13 th Int. Conf. on Applied Energy (ICAE2021).
The growing intensity of international commerce and the high share of total global greenhouse gas emissions by the maritime sector have motivated the implementation of regulations by the International Maritime Organisation to curtail large vessel emissions. Waste heat recovery is an effective way to improve ship energy efficiency, lower the temperature and amount of waste heat rejection to the environment, and therefore curb green-house gas emissions. In this article, existing and developmental on-board waste heat recovery technologies for maritime applications are reviewed. Emphasis is placed on the integration and performance of these technologies within the broader on-board energy system. Performance indicators are drawn from existing systems, experimental prototypes, and simulations, to quantitatively compare the different technologies in terms of power capacity, efficiency / coefficient of performance, heat source temperatures and specific cost of installation.
Thermal energy storage (TES) fosters the use of renewable energy, improves the efficiency of existing processes and enhances the flexibility of energy availability. Extensively researched and applied in buildings, TES is still in the early stages of its evolution regarding other relevant applications for which decarbonisation of heat exchange is paramount. This is the case in the maritime sector. Therefore, this research proposes a novel modular latent heat thermal energy storage (LHTES) system functioning with a phase change material (PCM) as an energy storage medium for installation on ships. An analytical model was developed relying on a theoretical approach consolidated in the literature. Firstly, the model was validated through the comparison with a reference case. Then, it was utilised for evaluating the functioning of various configurations of a TES device operating on board a vessel. The performance of the proposed system was investigated during the charging and discharging phases considering operating conditions typical of cruising and cargo vessels. The effects of device length and height were assessed and the influence of these parameters on the amount of energy stored and energy storage density was determined. Overall, the paper provides an innovative application of TES technology and highlights the wider benefits of energy storage in the maritime sector.
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