The Effects of Radiative Heat Transfer Upon the Melting and Solidification of Semitransparent Crystals

1974 ◽  
Vol 96 (2) ◽  
pp. 184-190 ◽  
Author(s):  
M. Abrams ◽  
R. Viskanta
Keyword(s):  
Phase Change ◽  
Equilibrium Phase ◽  
General Situation ◽  
Conservation Of Energy ◽  
Transfer Equations ◽  
Finite Difference Solution ◽  
Interfacial Growth ◽  
Radiative Transfer Equations ◽  
Radiant Transfer ◽  
Melting And Solidification

Employing the assumptions of one-dimensional energy transfer, equilibrium phase change, and negligible convection in liquid regions, the time-dependent conservation of energy equation is formulated for the general situation of n semitransparent contiguous liquid and solid phases. The dimensionless parameters governing phase change are identified and the effects of their variation are ascertained by a finite difference solution of the rigorously formulated energy and radiative transfer equations. The chief conclusions of this investigation are that for the range of parameters encountered in the melting and solidification of many optical materials, radiant transfer has a significant effect, and that during solidification, radiation can force the temperature profile within the liquid phase to assume a shape which leads to unstable interfacial growth.

Melting and solidification characteristics of cylindrical encapsulated phase change materials

2021 ◽  
Vol 43 ◽  
pp. 103104
Author(s):  
Mohammad Yaseen Shaker ◽  
Ahmed A. Sultan ◽  
Emad A. El Negiry ◽  
Ali Radwan
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Melting And Solidification

scholarly journals Charging-discharging characteristics of macro-encapsulated phase change materials in an active thermal energy storage system for a solar drying kiln

2017 ◽  
Vol 21 (6 Part A) ◽  
pp. 2525-2532 ◽  
Author(s):  
Shailendra Kumar ◽  
Kishan Kumar
Keyword(s):  
Phase Change ◽  
Thermal Energy ◽  
Phase Change Materials ◽  
Storage System ◽  
Thermal Storage ◽  
Water Tank ◽  
Solar Drying ◽  
Solidification Temperature ◽  
Water Storage Tank ◽  
Melting And Solidification

The present study explores suitability of two phase change materials (PCM) for development of an active thermal storage system for a solar drying kiln by studying their melting and solidification behaviors. A double glass glazing prototype solar kiln was used in the study. The storage system consisted of a water storage tank with PCM placed inside the water in high density polyethylene containers. The water in the tank was heated with help of solar energy using an evacuated tube collector array. The melting and solidification temperature curves of PCM were obtained by charging and discharging the water tank. The study illustrated the utility of the PCM in using the stored thermal energy during their discharge to enhance the temperature inside the kiln. The rate of temperature reduction was found to be higher for paraffin wax as compared to a fatty acid based PCM. The water temperature during the discharge of the PCM showed dependence on the discharge characteristics of each PCM suggesting their suitability in designing active thermal storage systems.

scholarly journals Heat transfer study of poly-c PV system integrated with phase change material under semi-arid area (Errachidia-Drâa Tafilalet)

2021 ◽  
Vol 297 ◽  
pp. 01008
Author(s):  
Ibtissam Lamaamar ◽  
Amine Tilioua ◽  
Zaineb Benzaid ◽  
Abdelouahed Ait Msaad ◽  
Moulay Ahmed Hamdi Alaoui
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Phase Change Material ◽  
Operating Temperature ◽  
Pv System ◽  
Pv Module ◽  
Solidification Processes ◽  
Change Material ◽  
Transfer Study ◽  
Melting And Solidification

The high operating temperature of the photovoltaic (PV) modules decreases significantly its efficiency. The integration of phase change material (PCM) is one of the feasible techniques for reducing the operating temperature of the PV module. A numerical simulation of the PV module with PCM and without PCM has been realized. The thermal behavior of the PV module was evaluated at the melting and solidification processes of PCM. The results show that the integration of RT35HC PCM with a thickness of 4 cm reduces the temperature of the PV module by 8 °C compared to the reference module. Compared the RT35 and RT35HC, we found that the latent heat has a significant effect on the PCM thermal comportment. Furthermore, it has been found that the thermal resistance of the layers plays an important role to dissipate the heat from the PV cells to the PCM layer, consequently improving the heat transfer inside the PV/PCM system.

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