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

Abstract

Abstract:The paper presents the results of a transient numerical investigation of the melting and solidification process of sodium nitrate (NaNO 3 ), 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.

Increased Melting Heat Transfer in the Latent Heat Energy Storage from the Tube-and-Shell Model to the Combine-and-Shell Model

“…A lot of research was conducted to decrease the charge time, adding a wire matrix on the tube [1], adding fins on the vertical wall [2], adding fins to the rectangle [3], using composite heat sinks [4], using two Phase Change Materials [5], inserting heat pipes [6], adding nanoparticles to the PCM [7,8], using encapsulated PCM [9], inserting matrix metal into the PCM [10], using two elliptical cylinders [11], and using porous media [12] being among them.…”

Improvement of Thermal Energy Storage by Integrating PCM Into Solar System

“…In this direction, a numerical study based on finite volume method using ANSYS FLUENT software has been conducted. Then, the accuracy of the study is verified by comparing numerical results with literature that show an excellent performance and good accordance [7,24] . Besides, the phase change material used for the numerical study is the paraffin that had a very high latent heat, obtainable and available on the market.…”

Farklı Soğutma Kanallarına Bir Kokil Kalıp Çekirdeğinin Termal Davranışlarının Nümerik Olarak İncelenmesi

“…Çalışmalarda, bu bozulmaları azaltmak için sonlu elemanlar stres modeli geliştirilmiş, bu model sayesinde ısı transferi hakkında korelasyonlar türetilmiştir. Üretilen numunelerin mikro yapıları ve mekanik özellikleri incelenmiştir [18][19][20][21][22][23][24]. Kalıp çekirdeği üzerindeki soğutma kanallarının kalıba dökülen erimiş metalin sıcaklık değişimi üzerindeki etkisi gözlemlenirken, sıvı metalin katılaşma sürecini incelenmiştir.…”