Evaluation of energy density as performance indicator for thermal energy storage at material and system levels
MetadataShow full item record
The increase of the capacity factor of thermal processes which use renewable energies is closely linked to the implementation of thermal energy storage (TES) systems. Currently, TES systems can be classified depending on the technology for storing thermal: sensible heat, latent heat, and sorption and chemical reactions (usually known as thermochemical energy storage). However, there is no standardized procedure for the evaluation of such technologies, and therefore the development of performance indicators which suit the requisites of the final users becomes an important goal. In the present paper, the authors identified the energy density as an important performance indicator for TES, and evaluated it at both material and system levels. This approach is afterwards applied to prototypes covering the three TES technologies: a two-tank molten salts sensible storage system, a shell-and-tube latent heat storage system, and a magnesium oxide and water chemical storage system. The evaluation of the energy density highlighted the difference of its value at the material value, which presents a theoretical maximum, and the results at system level, which considers all the parts required for operating the TES, and thus presents a significantly lower value. Moreover, the proposed approach captured the effect of the complexity and overall size of the system, showing the relevance of this performance indicator for evaluating technologies for applications in which volume is a limiting parameter.
Is part ofApplied Energy, 2019, vol. 235, p. 954-962
European research projects
The following license files are associated with this item:
Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by-nc-nd/4.0/
Showing items related by title, author, creator and subject.
Gibb, Duncan; Johnson, Maike; Romaní Picas, Joaquim; Gasia, Jaume; Cabeza, Luisa F.; Seitz, Antje (Elsevier, 2018)As a key tool for decarbonization, thermal energy storage systems integrated into processes can address issues related to energy efficiency and process flexibility, improve utilization of renewable energy resources and ...
Comparative study of the thermal performance of four different shell-and-tube heat exchangers used as latent heat thermal energy storage systems Gasia, Jaume; Diriken, Jan; Bourke, Malcolm; Van Bael, Johan; Cabeza, Luisa F. (Elsevier, 2017)In this paper, the influence of the addition of fins and the use of two different heat transfer fluids (water and a commercial silicone) have been experimentally tested and compared in four latent heat thermal energy storage ...
Experimental evaluation of a paraffin as phase change material for thermal energy storage in laboratory equipment and in a shell-and-tube heat exchanger Gasia, Jaume; Miró, Laia; Gracia Cuesta, Alvaro de; Barreneche Güerisoli, Camila; Cabeza, Luisa F. (MDPI, 2016)The thermal behavior of a commercial paraffin with a melting temperature of 58 ºC is analyzed as a phase change material (PCM) candidate for industrial waste heat recovery and domestic hot water applications. A full and ...