期刊
MATERIALS
卷 14, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/ma14020414
关键词
AHP; carbon fibres; conductivity; geopolymers; LCA; sustainability; thermal storage
This study investigated the temperature distribution and thermal performance of novel solid media for SHTES through finite element method (FEM) modeling. The results showed that localized reinforcement with fibers can increase thermal storage performance, and a Multi-Criteria Decision Making (MCDM) approach was used to select the most suitable material. More investigations are needed to optimize the coupling of fiber material and solid medium for high thermal performance and low environmental impacts.
Power plants based on solar energy are spreading to accomplish the incoming green energy transition. Besides, affordable high-temperature sensible heat thermal energy storage (SHTES) is required. In this work, the temperature distribution and thermal performance of novel solid media for SHTES are investigated by finite element method (FEM) modelling. A geopolymer, with/without fibre reinforcement, is simulated during a transient charging/discharging cycle. A life cycle assessment (LCA) analysis is also carried out to investigate the environmental impact and sustainability of the proposed materials, analysing the embodied energy, the transport, and the production process. A Multi-Criteria Decision Making (MCDM) with the Analytical Hierarchy Process (AHP) approach, taking into account thermal/environmental performance, is used to select the most suitable material. The results show that the localized reinforcement with fibres increases thermal storage performance, depending on the type of fibre, creating curvatures in the temperature profile and accelerating the charge/discharge. High-strength, high-conductivity carbon fibres performed well, and the simulation approach can be applied to any fibre arrangement/material. On the contrary, the benefit of the fibres is not straightforward according to the three different scenarios developed for the LCA and MCDM analyses, due to the high impact of the fibre production processes. More investigations are needed to balance and optimize the coupling of the fibre material and the solid medium to obtain high thermal performance and low impacts.
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