Facile Preparation of Calcium Stearoyl Lactylate as Solid–Liquid Phase Change Materials with Improved Form Stability and Adjustable Phase Transition Temperature for Thermal Comfort

2019 ◽  
Vol 38 (4) ◽  
pp. 13136
Author(s):  
Yuanyuan Jiang ◽  
Changlin Zhou ◽  
Zhimeng Liu ◽  
Bo Wu ◽  
Weibo Kong ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Liquid Phase ◽  
Thermal Comfort ◽  
Phase Change ◽  
Phase Transition Temperature ◽  
Phase Change Materials ◽  
Facile Preparation ◽  
Solid Liquid ◽  
Form Stability

Research on Compound and the Best Proportion of Phase Change Materials Using in Clothes

2011 ◽  
Vol 399-401 ◽  
pp. 1596-1599
Author(s):  
Rou Xi Chen ◽  
Yu Chai Sun
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Change ◽  
Phase Transition Temperature ◽  
Phase Change Materials ◽  
Eutectic Point ◽  
Eutectic System ◽  
Matlab Software ◽  
Application Fields

The desired phase-transition temperature and enthalpy of phase change materials are different in different application fields. When the composite way is reasonable, the phase-transition temperature and enthalpy of phase change can satisfy the demand of PCMs using in clothes. Based on The theory of eutectic system and the Schroeder Formula, the lowest eutectic point was computed by using MATLAB software in this paper, and then the enthalpy of phase change was also compared in order to get the best proportion of PCMs.

Preparation and Properties of Modified PolyGram Nano-Microencapsulated Phase Change Materials

2010 ◽  
Vol 160-162 ◽  
pp. 7-12
Author(s):  
Yi Da Tang ◽  
Wen Heng Zheng ◽  
Zhong Hua Tang ◽  
Ling Wang
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Change ◽  
Phase Transition Temperature ◽  
Phase Change Materials ◽  
Core Material ◽  
Shell Material ◽  
Microencapsulated Phase Change Materials ◽  
Nanometer Material ◽  
Bactericidal Efficiency

The nano-microencapsulated phase change materials were prepared ,with butyl stearate as core material, styrene-maleic anhydride copolymer (SMA) as dispersant and emulsifier, polyurea resin as shell material which was synthesized from monomer 2, 4- toluene diisocyanate (TDI) and diethylen etriamine (DETA),and was modified by glycerol, nanometer material(TiO2) as functional material. We have analyzed the compactness, stabilities, phase transition temperature, and bactericidal efficiency of microcapsules. The results show that the compactness properties and stabilities properties of the modified microcapsule, when the ratio of core material and shell material is 3:4, such as washing stability properties and thermal stability properties are obviously improved than that of non-modified, phase transition temperature rises from 23.2°C to 24.2°C,bactericidal efficiency of Nano-Micro-PCMs is 7~8 times more than that of separate using of nanometer material （TiO2）, modified polyurea Nano-Micro-PCMs may have extensive application prospects in the fields of architecture, textile and air-conditioning filtering materials.

Preparation of Expanded Perlite-Based Binary Eutectic Composite of Phase Change Heat Storage Materials

2011 ◽  
Vol 383-390 ◽  
pp. 2889-2893
Author(s):  
Bao Yun Zhang ◽  
Chang Mei Jiao ◽  
Peng Wang ◽  
Long Jiang ◽  
Bao Hua Ji ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Phase Change ◽  
Latent Heat ◽  
Phase Transition Temperature ◽  
Phase Change Materials ◽  
Vacuum Impregnation ◽  
Expanded Perlite ◽  
Good Thermal Stability ◽  
Binary Eutectic

The binary eutectic of lauric acid-stearic acid / expanded perlite composite phase change materials (PCM) was prepared using the method of vacuum impregnation. The structures and properties of this composite PCM were characterized by FT-IR, SEM, DSC and TG analysis. The results showed that the binary eutectic of fatty acid had been composed with porous skeleton expanded perlite completely in a physical method, the phase transition temperature of composite PCM was about 33.0 °C and latent heat was 131.3 J/g. it had a good thermal stability after 100 times of recycling and gave the phase transition temperature 33.5 °C and the latent heat of 128.1 J/g respectively.

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.

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