Critical review on measured phase transition enthalpies of salt hydrates in the context of solid-liquid phase change materials

2020 ◽  
Vol 683 ◽  
pp. 178477 ◽  
Author(s):  
Henri Schmit ◽  
Christoph Rathgeber ◽  
Peter Hoock ◽  
Stefan Hiebler
Keyword(s):  
Phase Transition ◽  
Liquid Phase ◽  
Phase Change ◽  
Critical Review ◽  
Phase Change Materials ◽  
Salt Hydrates ◽  
Solid Liquid ◽  
Measured Phase

scholarly journals Integral Solution of Two-Region Solid–Liquid Phase Change in Annular Geometries and Application to Phase Change Materials–Air Heat Exchangers

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4474 ◽  
Author(s):  
Hamidreza Shabgard ◽  
Weiwei Zhu ◽  
Amir Faghri
Keyword(s):  
Liquid Phase ◽  
Boundary Conditions ◽  
Phase Change ◽  
Phase Change Materials ◽  
Volume Fraction ◽  
Control Volume ◽  
Solid Volume Fraction ◽  
Solidification Time ◽  
Design And Optimization ◽  
Solid Liquid

A mathematical model based on the integral method is developed to solve the problem of conduction-controlled solid–liquid phase change in annular geometries with temperature gradients in both phases. The inner and outer boundaries of the annulus were subject to convective, constant temperature or adiabatic boundary conditions. The developed model was validated by comparison with control volume-based computational results using the temperature-transforming phase change model, and an excellent agreement was achieved. The model was used to conduct parametric studies on the effect of annuli geometry, thermophysical properties of the phase change materials (PCM), and thermal boundary conditions on the dynamics of phase change. For an initially liquid PCM, it was found that increasing the radii ratio increased the total solidification time. Also, increasing the Biot number at the cooled (heated) boundary and Stefan number of the solid (liquid) PCM, decreased (increased) the solidification time and resulted in a greater (smaller) solid volume fraction at steady state. The application of the developed method was demonstrated by design and analysis of a PCM–air heat exchanger for HVAC systems. The model can also be easily employed for design and optimization of annular PCM systems for all associated applications in a fraction of time needed for computational simulations.

Synthesis of novel solid–liquid phase change materials and electrospinning of ultrafine phase change fibers

2012 ◽  
Vol 96 ◽  
pp. 202-209 ◽  
Author(s):  
Changzhong Chen ◽  
Shanshan Liu ◽  
Wenmin Liu ◽  
Yiyang Zhao ◽  
Youzhi Lu
Keyword(s):  
Liquid Phase ◽  
Phase Change ◽  
Phase Change Materials ◽  
Solid Liquid
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