Sorption based long-term thermal energy storage – Process classification and analysis of performance limitations: A review. (September 2019)

• Record Type: Journal Article
• Authors: Fumey, B.; Weber, R.; Baldini, L.
• Is Part Of: Renewable & sustainable energy reviews. Volume 111(2019)
• Page Start: 57
• Page End: 74
• Publication Date: 2019-09
• Subjects: Long-term sorption thermal energy storage -- Temperature effectiveness -- Process categorisation -- System performance evaluation -- Comparison across basic designs -- Evaluation of design dependent performance degradation; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.rser.2019.05.006
• Languages: English
• ISSNs: 1364-0321

Abstract

Abstract: In sorption heat storage, one of the sources of discrepancy between theoretical material based energy storage potential and resulting system performance is the choice of process type. In this paper, in order to understand this performance deviation, a sorption heat storage process categorisation is proposed. This is followed by a review of reported sorption systems categorised according to the proposed process classification. An analysis of the reported systems is then undertaken, focusing on the ratio of resulting temperature gain in sorption (ad- or absorption), compared to required temperature lift in desorption. This measure is termed temperature effectiveness and enables a form of system performance evaluation in the broad landscape of sorption thermal energy storage demonstrators. It is argued that other performance parameters such as volumetric energy storage density and volumetric charge and discharge power density are not adequate for comparison due to the highly varying testing conditions applied. From the system evaluation, it is seen that best temperature effectiveness is generally found in a closed, transported process with the ability of single sorbent pass and true counter flow heat exchange. Highlights: The basic sorption thermal energy storage processes are, open fixed, open transported, closed fixed and closed transported. Temperature effectiveness is a universal means for sorption heat storage system performance comparison. Closed transported sorption thermal energy storage systems show the best performance in respect to temperature effectiveness.