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Energies 2016, 9(3), 205; doi:10.3390/en9030205

Transient Numerical Simulation of the Melting and Solidification Behavior of NaNO3 Using a Wire Matrix for Enhancing the Heat Transfer

Institute for Energy Systems and Thermodynamics, Technische Universität Wien, Getreidemarkt 9, 1060 Vienna, Austria
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Academic Editor: Chi-Ming Lai
Received: 19 January 2016 / Revised: 26 February 2016 / Accepted: 8 March 2016 / Published: 16 March 2016
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Abstract

The paper presents the results of a transient numerical investigation of the melting and solidification process of sodium nitrate (NaNO3), which is used as phase change material. For enhancing the heat transfer to the sodium nitrate an aluminum wire matrix is used. The numerical simulation of the melting and solidification process was done with the enthalpy-porosity approach. The numerical analysis of the melting process has shown that apart from the first period of the charging process, where heat conduction is the main heat transfer mechanism, natural convection is the dominant heat transfer mechanism. The numerical investigation of the solidification process has shown that the dominant heat transfer mechanism is heat conduction. Based on the numerical results, the discharging process has been slower than the charging process. The performance of the charged and discharged power has shown that the wire matrix is an alternative method to enhance the heat transfer into the phase change material. View Full-Text
Keywords: transient numerical simulation; thermal energy storage; wire matrix; heat transfer enhancement; sodium nitrate; latent energy storage; natural convection; melting; solidification transient numerical simulation; thermal energy storage; wire matrix; heat transfer enhancement; sodium nitrate; latent energy storage; natural convection; melting; solidification
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Koller, M.; Walter, H.; Hameter, M. Transient Numerical Simulation of the Melting and Solidification Behavior of NaNO3 Using a Wire Matrix for Enhancing the Heat Transfer. Energies 2016, 9, 205.

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