Simulative Investigation of Thermal Capacity Analysis Methods for Metallic Latent Thermal Energy Storage Systems

Veronika Stahl, Werner Kraft, Peter Vetter and Florian Feder
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Veronika Stahl: German Aerospace Center, Institute of Vehicle Concepts, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
Werner Kraft: German Aerospace Center, Institute of Vehicle Concepts, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
Peter Vetter: German Aerospace Center, Institute of Vehicle Concepts, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
Florian Feder: German Aerospace Center, Institute of Vehicle Concepts, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany

Energies, 2021, vol. 14, issue 8, 1-14

Abstract: Latent heat storage systems are a promising technology for storing and providing thermal energy with low volume, mass and cost requirements, especially when operated at high temperatures. Metallic phase change materials are particularly advantageous for high thermal input and output, which is especially important for mobile applications. When designing a storage system, it is essential to have precise knowledge about the potential storage capacity. However, the system’s storage capacity is typically calculated from material properties determined at lab scale, although systemic boundary conditions can have a considerable influence. Systemic influences can result from thermal and reactive interfaces or from the storage design. In order to consider these influences, we propose three calorimetric procedures to thermally analyse high-temperature metallic latent energy storage systems at an application scale. We examined the procedures in a transient simulation environment, monitoring the storage capacity of the system. The procedure, based on adiabatic conditions, shows the least deviation from the simulation input parameters, but is limited to the heating process of the storage. Discharging the storage can be represented by isoperibolic conditions with controlled heat exchange. The precision of the procedures depends on the evaluation routine, the calibration routine, the heat extraction rate and the thermal inertia of the test bench.

Keywords: phase change material; latent thermal energy storage; thermal analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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