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Thermal Contact Resistance: Implications for Thermal Energy Storage Systems

Stahl, Veronika and Rawson, Anthony Joseph and Kraft, Werner and Vetter, Peter and Nees, Frank and Kargl, Florian (2021) Thermal Contact Resistance: Implications for Thermal Energy Storage Systems. 15th International Virtual Conference on Energy Storage (ENERSTOCK 2021), 2021-06-09 - 2021-06-11, Ljubljana, Slovenia.

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In thermal energy storage systems a major characteristic for charge and discharge rates is the overall thermal resistance between heat sink and heat source. Precise knowledge about thermal resistance is necessary for designing and simulating storage components. However, the thermal resistance is often simplified to bulk resistance of the materials whereas the thermal contact resistance at their interface is neglected. In this study we determine thermal contact resistances relevant to thermal energy storage systems and operating conditions. It is shown that the thermal contact resistance can have a clear effect on overall heat in- and output depending on the design of the storage component. Thermal contact resistances between storage material and container material were determined via a modified stationary cylinder method. The examined storage material was the metallic Phase Change Material Al-12wt%.Si and the examined container material was the Ceramic Matrix Composite C/C-SiC. The thermal contact resistance dependence on temperature (25 - 300 °C) and pressure (0 - 4 MPa) was found. The thermal contact resistance between storage and container material was found to decrease asymptotically with increasing temperature and increasing pressure. For pressures over 3 MPa the contact resistance was reduced to under 1 cm²K/W. It is concluded that thermal contact resistance can have a major effect on charge and discharge rates, especially for storage designs where several layers of materials lie between heat source and heat sink. Storage designs that take advantage of pressure between storage material and heat transport components due to solidification or thermal expansion/contraction could improve functionality. Thus, thermal contact resistance is recommended to be considered in the design of thermal energy storage systems.

Item URL in elib:https://elib.dlr.de/145530/
Document Type:Conference or Workshop Item (Poster)
Title:Thermal Contact Resistance: Implications for Thermal Energy Storage Systems
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Stahl, VeronikaUNSPECIFIEDhttps://orcid.org/0000-0002-1866-3369UNSPECIFIED
Kraft, WernerUNSPECIFIEDhttps://orcid.org/0000-0002-1971-2353UNSPECIFIED
Nees, FrankUNSPECIFIEDhttps://orcid.org/0009-0002-4628-3379UNSPECIFIED
Date:10 June 2021
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Thermal contact resistance, thermal energy storage, stationary cylinder method
Event Title:15th International Virtual Conference on Energy Storage (ENERSTOCK 2021)
Event Location:Ljubljana, Slovenia
Event Type:international Conference
Event Start Date:9 June 2021
Event End Date:11 June 2021
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - Energie und Verkehr (old)
Location: Stuttgart
Institutes and Institutions:Institute of Vehicle Concepts > Alternative Energiewandler
Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Stahl, Veronika
Deposited On:15 Nov 2021 06:35
Last Modified:24 Apr 2024 20:44

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