Experimental investigation of major rocks in Hong Kong as potential sensible thermal energy storage medium

IF 6.9 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Engineering Geology Pub Date : 2024-10-10 DOI:10.1016/j.enggeo.2024.107763

Zihan Liu, Louis Ngai Yuen Wong, Su-Chin Chang

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Abstract

Energy storage is considered a viable solution for managing renewable energies, and rock is recognized as an economically feasible and environmentally friendly medium for sensible heat storage. Following the principle of utilizing local resources, fifteen major rock types from Hong Kong—covering igneous, sedimentary, and metamorphic classifications—were collected and processed to required sizes for several characterization techniques, considering their heterogeneity and anisotropy. Thermophysical (thermal diffusivity/conductivity, heat capacity, and thermal expansion coefficient) and mechanical properties of the selected rocks were analyzed from room temperature to 1000 °C, along with their chemical and structural compositions. Through multidimensional evaluation, the suitability (optimal, average, poor) 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 thermal energy storage 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) thermal energy storage engineering. However, sedimentary and metamorphic rocks from Hong Kong appear unsuitable for local thermal energy storage engineering.

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香港主要岩石作为潜在显热储能介质的实验研究

能量储存被认为是管理可再生能源的可行方案，而岩石被认为是经济可行且环保的显热储存介质。考虑到岩石的异质性和各向异性，研究人员遵循利用本地资源的原则，从香港收集了 15 种主要岩石类型（包括火成岩、沉积岩和变质岩），并将其加工至所需尺寸，以采用多种表征技术。对所选岩石的热物理特性（热扩散率/传导率、热容量和热膨胀系数）和机械特性进行了分析，分析范围从室温到 1000 °C，同时还分析了它们的化学和结构组成。通过多维评价，评估了这些香港岩石作为热能储存介质的适宜性（最佳、一般、较差）。结果表明，香港玄武岩是高温热能储存材料的最佳候选者，850 ℃ 是合适的最高工作温度。香港的其他火成岩可用于中低温范围（100-500 ℃）的热能储存工程。不过，香港的沉积岩和变质岩似乎不适合用于本地的热能储存工程。

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来源期刊

Engineering Geology 地学-地球科学综合

CiteScore

13.70

自引率

12.20%

发文量

327

审稿时长

5.6 months

期刊介绍： Engineering Geology, an international interdisciplinary journal, serves as a bridge between earth sciences and engineering, focusing on geological and geotechnical engineering. It welcomes studies with relevance to engineering, environmental concerns, and safety, catering to engineering geologists with backgrounds in geology or civil/mining engineering. Topics include applied geomorphology, structural geology, geophysics, geochemistry, environmental geology, hydrogeology, land use planning, natural hazards, remote sensing, soil and rock mechanics, and applied geotechnical engineering. The journal provides a platform for research at the intersection of geology and engineering disciplines.