Can the Potential of Hong Kong Rocks be Harnessed for Effective Thermal Energy Storage?
DOI:
https://doi.org/10.21467/proceedings.7.7.12Abstract
Alternative clean energy sources such as solar, nuclear, and geothermal have undergone considerable advancements. Thermal energy storage (TES) can also be employed to directly capture and store waste heat generated from diesel generators’ exhaust gases. TES can be classified into three primary categories: sensible heat storage, latent heat storage, and thermochemical heat storage. Sensible heat storage involves storing energy by raising the temperature of a material without changing its phase. No TES systems have been implemented in Hong Kong thus far. This study aims to assess the thermophysical properties of Hong Kong rocks, serving as a foundational reference for future TES site and material selection endeavors. A total of 15 common rock types were selected, comprehensively covering igneous, sedimentary, and metamorphic lithologies. These rock samples were tested for four physical or petrology and five thermophysical parameters under continuous real-time heating up to 1000 °C. Through multidimensional evaluation, the suitability of these rocks from Hong Kong to serve as thermal energy storage media was assessed. The results obtained indicated that Hong Kong basalt is the optimal candidate for high-temperature TES material, with 850°C identified as the suitable maximum working temperature. Other igneous rocks from Hong Kong can be utilized for mid-to-low temperature range (100–500 °C) TES engineering.
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