Journal
ENERGIES
Volume 9, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/en9030205
Keywords
transient numerical simulation; natural convection; melting; solidification; latent energy storage; wire matrix; sodium nitrate; heat transfer enhancement; thermal energy storage
Categories
Funding
- Federal Ministry of Transport, Innovation and Technology [836636]
- Federal Ministry of Science, Research and Economy
- Vienna Business Agency
- Federal Province of Lower Austria
- Federal Province of Upper Austria
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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.
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