The composite preparation of phase changes materials
For integrating phase change materials and building envelope material and to make them practical in stage, three common methods are: impregnation; direct addition; and encapsulation.
(1) Impregnation is a method that involves immersing porous building material in molten, phase-change materials. Then using capillary motion to adsorb any phase change materials. This process is easy to follow, it’s simple and you can prepare phase change building materials with ordinary materials anywhere at any given time. The liquid phase changes material cannot flow when the top tension of the main material exceeds that of the liquid. Gypsum board works well with various phase change material, including SUNIC, methyl ester, and lauric mixture.
(2) The Direct-Addition method: It involves the direct addition phase change materials in building material preparation. These advantages include a quick process, low cost, and uniform distribution. Feldman et al. Feldman et.al. Research has shown that phase change board made of gypsum can significantly reduce indoor temperature variation.
(3) Packaging method The two main types of packaging are micro package and macro package. It is used for encapsulating phase-change material in small containers (e.g., pipes, bags etc.). Microencapsulation is used to encapsulate particles of phase changing materials (PCMs), using polymer films. Both materials and their components are compatible. This is a good option because the material has a high heat transfer area. Although the heat transfer efficiency is excellent, it may reduce the strength of its envelope.
One type of composite material which is prepared via encapsulation, the shape-stabilized phases change material, has gained much attention in recent times. It is composed primarily of the phase change (core material), polymer (polymer) and encapsulation/capsule materials (capsule). It has a high melting temperature and plays an essential role in the construction of composite materials. The spatial network structure is protected by capsules. It’s not possible to leak from composite materials because of its strength. The material’s stored energy may be similar to those of phase change materials.
Numerical simulations of heat transport in phase change material
ANSYS remains the standard software used for phase transformation analysis. American finite element manufacturer, ANSYS developed it. It includes all functions related to structure, fluid, electric, magnetic, sound, and thermal analysis. Because phase transition involves latent heat absorption/release, it’s a nonlinear transient thermoanalysis problem. ANSYS analyzes phase transformation, which is one of its key functions. ANSYS analyzes the latent warmth of materials, by defining enthalpy (product density and specific heat) and simplifying the calculations.
Sun Xiao (and others) used Ansys’empowering non-linear analyze function to simulate temperatures in a composite phase switch wall made from paraffin and gypsum. The ribbed structure aids in heat storage for phase change materials. Chai Guiorong created a mathematical model based ANSYS software. It calculates and analyzes the heat transfer characteristics, as well energy saving effects of phase changing walls made with concrete of different thicknesses. According to the calculations, the difference in energy consumption between two walls made of concrete of different thicknesses is negligible. However, Chai Guorong has determined that the best thickness of the mold-stabilized Phase Change Material should be determined by considering all factors. As the wall surfaces temperature drop, so does the fluctuation amplitude.
Though the research into phase change material has progressed in theory, many types of phase switch materials aren’t suitable for all engineering fields. How to make phase change material suitable for different situations, with high heat, low expansion and shrinkage and nontoxic, noncorrosive and non-obnoxious is the future direction. Additionally, traditional techniques and processes remain in place for preparation of phase changes materials. Microcapsules are a promising encapsulation method that has recently been proposed by researchers. It is difficult to know how to integrate phase changes into matrix materials. This remains the subject of much research.
As computer technology advances rapidly, researchers increasingly use it to simulate phase change issues. Furthermore, the validity of simulation results is well documented, which makes them easier for scientists and engineers who are looking into phase change materials. You can build a more exact mathematical model by looking at the whole picture. Future generations will find the general law useful. Additionally, software tools for phase changes analysis are rare, which makes it crucial to design software programs that perform better.
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