Compact Model of Latent Heat Thermal Storage for Its Integration in Multi-Energy Systems

Abstract

Nowadays, flexibility through energy storage constitutes a key feature for the optimal management of energy systems. Concerning thermal energy, Latent Heat Thermal Storage (LHTS) units are characterized by a significantly higher energy density with respect to sensible storage systems. For this reason, they represent an interesting solution where limited space is available. Nevertheless, their market development is limited by engineering issues and, most importantly, by scarce knowledge about LHTS integration in existing energy systems. This study presents a new modeling approach to quickly characterize the dynamic behavior of an LHTS unit. The thermal power released or absorbed by a LHTS module is expressed only as a function of the current and the initial state of charge. The proposed model allows simulating even partial charge and discharge processes. Results are fairly accurate when compared to a 2D finite volume model, although the computational effort is considerably lower. Summarizing, the proposed model could be used to investigate optimal LHTS control strategies at the system level. In this paper, two relevant case studies are presented: (a) the reduction of the morning thermal power peak in District Heating systems; and (b) the optimal energy supply schedule in multi-energy systems.

Special Issue “Advanced Phase Change Materials for Thermal Storage”

“…The last paper of this special issue presented a compact model of latent heat thermal storage (LHTS) for its integration in multi-energy systems [6]. In this way, the study developed a new modeling approach to quickly characterize the dynamic behavior of an LHTS unit.…”

Compact Model of a Screen under Fan-Induced Swirl Conditions Using a Porous Media Approach

“…The use of compact models to characterize the performance of complex systems in order to make the simulation and design tasks easier and faster is widely extended in different engineering applications: the electric field generated in tunnel field-effect transistors, Najam et al [27]; the circuit models of vertical-cavity surface-emitting lasers, Li et al [28]; the dynamic performance of latent heat thermal storage units, Colangelo et al [29].…”

Innovative Renewable Technology Integration for Nearly Zero-Energy Buildings within the Re-COGNITION Project

“…• Thermal storage: The model of the charging and discharging phase of a LHTS is dynamic and non-linear [38]. The thermal power absorbed or released is strongly dependent on the state of charge of the unit.…”