Enhanced Melting in Geometries Suitable for Thermal Energy Storage

Ziskind, G.; Rozenfeld, Tomer; Kozak, Yoram

doi:10.1615/ihtc15.hex.009435

Cited by 2 publications

(2 citation statements)

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“…29, an analytical solution may be obtained, using a quasi-steady one-dimensional approach, showing an explicit dependence on the Stefan and Fourier numbers. Figure 5 shows experimental results for melting with HTF temperature of 57°C for two different cases: (a) the solid was fixed to the unit transparent shell, (b) the solid bulk was allowed to sink and close-contact melting was achieved.…”

Section: B Analytical Modelmentioning

confidence: 99%

Heat Transfer Enhancement in Latent Heat Storage Units

Rozenfeld

Kozak

Ziskind

2014

11th AIAA/ASME Joint Thermophysics and Heat Transfer Conference

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In the present work, latent heat thermal storage devices that use an array of fins are studied experimentally and theoretically. The thermal storage charging/discharging process is driven by a hot/cold heat transfer fluid (HTF) flowing inside the tube from which heat is conducted to the fins that are in contact with the bulk of the PCM inside a cylindrical shell, causing the PCM to melt/solidify. The present study focuses on a case in which the envelope of the unit is exposed to a heated environment and close-contact melting takes place on the upper surface of the fins. It is demonstrated that close-contact melting affects noticeably the melting rate and shortens the melting time considerably. Nomenclature= gravity acceleration S = momentum source term ħ = specific enthalpy k = thermal conductivity T = temperature ħref = reference enthalpy at the reference temperature Tref = reference temperature cp = specific heat L = specific enthalpy of melting (latent heat)  = liquid fraction A = porosity function C = mushy constant

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Section: B Analytical Modelmentioning

confidence: 99%

Heat Transfer Enhancement in Latent Heat Storage Units

Rozenfeld

Kozak

Ziskind

2014

11th AIAA/ASME Joint Thermophysics and Heat Transfer Conference

Self Cite

View full text Add to dashboard Cite

show abstract

“…Then, the model is further used for a dimensional analysis which reveals the governing dimensional parameters and leads to generalization of the results. We note that the upper part of the unit may be modeled analytically, similarly to the model reported in [57] for a half-cylinder on a horizontal heated surface.…”

Section: Introductionmentioning

confidence: 99%