Thermal energy storages allow energy saving and efficient energy utilization when production and use need to be decoupled. This paper focuses on the analysis and comparison of different types of thermal storages that involve transfer of mass (open systems) or heat (closed systems). The aim is to present dynamic models that enable the calculation of performance, thermal stratification and any other relevant aspect of the storage behaviour. Each configuration is analyzed using approaches of different complexity: zero-dimensional, quasi-one dimensional and one-dimensional. Validation of the models was possible through experimental data found in the literature. Several simulation runs were performed to show the effectiveness of each solution in storing energy. In particular, a sensitivity analysis is carried out using the one-dimensional approach to analyze the effect of the main variables on the capability of storing thermal energy. Simulation results show the advantages of using open systems when the charging/discharging phases need to be short, or instead, closed systems when a big amount of energy is to be stored and the charging/discharging phases can be longer.

Modeling of sensible thermal energy storage systems

Sergio Rech;Andrea Lazzaretto
2018

Abstract

Thermal energy storages allow energy saving and efficient energy utilization when production and use need to be decoupled. This paper focuses on the analysis and comparison of different types of thermal storages that involve transfer of mass (open systems) or heat (closed systems). The aim is to present dynamic models that enable the calculation of performance, thermal stratification and any other relevant aspect of the storage behaviour. Each configuration is analyzed using approaches of different complexity: zero-dimensional, quasi-one dimensional and one-dimensional. Validation of the models was possible through experimental data found in the literature. Several simulation runs were performed to show the effectiveness of each solution in storing energy. In particular, a sensitivity analysis is carried out using the one-dimensional approach to analyze the effect of the main variables on the capability of storing thermal energy. Simulation results show the advantages of using open systems when the charging/discharging phases need to be short, or instead, closed systems when a big amount of energy is to be stored and the charging/discharging phases can be longer.
2018
PROCEEDINGS OF CPOTE 2018 - 5TH INTERNATIONAL CONFERENCE ON CONTEMPORARY PROBLEMS OF THERMAL ENGINEERING
978-83-61506-46-1
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3278862
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