Decision Support System of Innovative High-Temperature Latent Heat Storage for Waste Heat Recovery in the Energy-Intensive Industry

Reduction in energy consumption, carbon footprint, equipment size and cost are key objectives for the forthcoming energy-intensive industries roadmaps. In this sense, solutions, such as waste heat recovery, which can be replicated into different sectors (i.e. ceramics, concrete, glass, steel, aluminium, pulp and paper) are highly promoted. In this line, latent heat thermal energy storage (TES) contributes as an innovative technology solution to improve the overall system efficiency by recovering and storing industrial waste heat. To this end, phase-change material (PCM) selection is assisted through a decision-support system (DSS). A simplified tool based on the MATLAB® model, based on correlations among the most relevant system parameters, was developed to prove the feasibility of a cross-sectorial approach. The research work conducted a parametric analysis to assess the techno-economic performance of the PCM-TES solution under different working conditions and sectors. Additionally, a multicriteria assessment was conducted comparing the tool outputs from metal alloys and inorganic hydrated PCM salts. Overall, the inorganic PCMs presented higher net economic and energy savings (up to 25000 €/year; 480 MWh/year); while metal alloys involved promising results, shorter cycles and competitive economic ratios; while its commercial development is still limited.