The Effect of Phase Change Materials on the Physical, Thermal and Mechanical Properties of Cement

Sci ◽  
2019 ◽  
Vol 1 (1) ◽  
pp. 27 ◽  
Author(s):  
Zakaria Dakhli ◽  
Khaled Chaffar ◽  
Zoubeir Lafhaj
Keyword(s):  
Phase Change ◽  
Development Strategy ◽  
Phase Change Materials ◽  
Materials Science ◽  
Current Trend ◽  
Building Construction ◽  
Concrete Mixtures ◽  
Materials Used ◽  
Save Energy ◽  
Change Material

When focusing on materials science in civil engineering, the current trend is to investigate the use of innovative solutions in order to enhance thermal and energy performances. This trend is amplified with the need for a sustainable development strategy for the construction sector. This paper assesses the integration of a Phase Change Material (PCM) in cement intended for building construction. The key characteristic of PCMs is their capacity to absorb energy and restore it. In building construction, this feature could be harnessed to save energy by incorporating PCMs in the materials used. In this study, passive integration of PCM in cement was tested and thermal properties of such an integration was assessed. The results provide insights into how PCMs affect cement as part of the concrete mixture, thus identifying the contribution of PCM-based cements in concrete mixtures.

A Study on the Development of Phase Change Material Wall

2011 ◽  
Vol 347-353 ◽  
pp. 2773-2776
Author(s):  
Quan Ying Yan ◽  
Li Li Jin ◽  
Lin Zhang
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Materials Used ◽  
Change Material ◽  
Selection Of

In this paper, the types, properties and selection of phase-change materials used in the wall were evaluated. The feasibility and methods to add phase change materials into the wall were discussed. The application and development situation of the phase change material wall in the practice were elaborated. Some problems to be solved are pointed out.

Study on Binary Fatty Acids/ Sepiolite Composite Phase Change Material

2011 ◽  
Vol 374-377 ◽  
pp. 807-810 ◽  
Author(s):  
Jian Hong Deng ◽  
Wen Biao Li ◽  
Da Hua Jiang
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Energy Storage Materials ◽  
Binary Phase ◽  
Good Energy ◽  
Save Energy ◽  
Composite Energy ◽  
Change Material

Lauric acid/stearic acid as the binary phase change materials, modified sepiolite as the inorganic carrier, organic/inorganic composite energy storage materials was prepared by melting adsorption.Comprehensive experiment results show that binary phase change material is lower than single one at initial phase change temperature and phase change peak temperature, and it has good energy storage results, the composite material can be used in energy storage and heat recovery system to save energy.

Research on the Thermal Storage Performance of Solid-Solid Phase-Change Material Used in the Wall

2011 ◽  
Vol 347-353 ◽  
pp. 2801-2804 ◽  
Author(s):  
Quan Ying Yan ◽  
Li Li Jin
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Binary Systems ◽  
Phase Change Materials ◽  
Solid Phase ◽  
Thermal Storage ◽  
Phase Change Temperature ◽  
Change Temperature ◽  
Materials Used ◽  
Change Material

Solid-solid phase change material can increase the thermal storage capacity of the wall, decrease the indoor temperature fluctuation and building energy consumption when it was used in the phase change material (PCM) wall. This paper investigated experimentally the phase change temperature and latent heat of polyalcohols binary system with different component, and analyzed the feasibility of phase change wall. The results show that binary systems have suitable phase change temperature and bigger phase change latent. They are ideal phase change materials used in the wall.

Experimental Research on Shape-Stabilized Phase Change Materials Applied in the Phase Change Wall

2013 ◽  
Vol 800 ◽  
pp. 243-246
Author(s):  
Li Hang Yue ◽  
Quan Ying Yan ◽  
Zhen Bang Ruan
Keyword(s):  
Phase Change ◽  
Latent Heat ◽  
Mass Fraction ◽  
Phase Change Materials ◽  
Critical Mass ◽  
Phase Change Temperature ◽  
Change Temperature ◽  
Save Energy ◽  
The Stability ◽  
Change Material

Shape-stabilized phase change materials can store thermal energy and save energy when it is added into the wall. The phase change temperature, latent heat and the stability of shape-stabilized phase change materials with different component were studied experimentally. The critical mass fraction of paraffin required in the materials is given. It is proved that the shape-stabilized phase change material is ideal material used in the phase change wall because it has good stability and uniformity, higher latent heat and suitable phase change temperature.

scholarly journals Phase change materials for building construction: An overview of nano-/micro-encapsulation

2020 ◽  
Vol 9 (1) ◽  
pp. 896-921
Author(s):  
Amende Sivanathan ◽  
Qingqing Dou ◽  
Yuxuan Wang ◽  
Yunfeng Li ◽  
Jorge Corker ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Phase Change ◽  
High Performance ◽  
Phase Change Materials ◽  
Structural Integrity ◽  
Renewable Energy Sources ◽  
Building Construction ◽  
Core Material ◽  
Energy Efficient Buildings ◽  
Change Material

AbstractBuildings contribute to 40% of total global energy consumption, which is responsible to 38% of greenhouse gas emissions. It is critical to enhance the energy efficiency of buildings to mitigate global warming. In the last decade, advances in thermal energy storage (TES) techniques using phase change material (PCM) have gained much attention among researchers, mainly to reduce energy consumption and to promote the use of renewable energy sources such as solar energy. PCM technology is one of the most promising technologies available for the development of high performance and energy-efficient buildings and, therefore, considered as one of the most effective and on-going fields of research. The main limitation of PCM is its leakage problem which limits its potential use in building construction and other applications such as TES and textiles, which can be overcome by employing nano-/micro-encapsulation technologies. This paper comprehensively overviews the nano-/micro-encapsulation technologies, which are mainly classified into three categories including physical, physiochemical and chemical methods, and the properties of microcapsules prepared. Among all encapsulation technologies available, the chemical method is commonly used since it offers the best technological approach in terms of encapsulation efficiency and better structural integrity of core material. There is a need to develop a method for the synthesis of nano-encapsulated PCMs to achieve enhanced structural stability and better fracture resistance and, thus, longer service life. The accumulated database of properties/performance of PCMs and synthesised nano-/micro-capsules from various techniques presented in the paper should serve as the most useful information for the production of nano-/micro-capsules with desirable characteristics for building construction application and further innovation of PCM technology.

Theoretical and Experimental Studies on Preparation of OMMT-Based Composite Phase Change Materials Used in Asphalt Pavement

2014 ◽  
Vol 599 ◽  
pp. 355-360 ◽  
Author(s):  
Bin Bin Leng ◽  
Mei Zhu Chen ◽  
Shao Ping Zheng ◽  
Shao Peng Wu
Keyword(s):  
Phase Transition ◽  
Theoretical Analysis ◽  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Asphalt Pavement ◽  
Experimental Studies ◽  
Composite Phase Change Material ◽  
Materials Used ◽  
Change Material

With the global warming, phase change materials are being expected to be applied in asphalt pavement to help lower its surface temperature. In this study, a kind of composite phase change material was prepared and its technique parameters were optimized through theoretical analysis and experimental study. A solid-liquid phase change material, with melt point of 43°C and phase transition heat of 161.6J/g, was used as core. The organophilic montmorillonite (OMMT) was used as a carrier and can prevent leakage of the melted phase change materials. The results showed that the ratio of OMMT to lauric acid was 2.6:1, and the melting temperature and time were 74°Cand 1.5hours, respectively. The composite phase change material prepared in this study had the phase transition latent heat of 36.168J/g and the transition temperature of 40.094°C. And the experimental results are in good agreement with theoretical analysis.

scholarly journals Experimental Characterization of Phase Change Materials for Refrigeration Processes

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3033
Author(s):  
Anastasia Stamatiou ◽  
Lukas Müller ◽  
Roger Zimmermann ◽  
Jamie Hillis ◽  
David Oliver ◽  
...  
Keyword(s):  
Energy Density ◽  
Phase Change ◽  
Thermophysical Properties ◽  
Phase Change Materials ◽  
Cost Effective ◽  
Latent Heat Storage ◽  
Lower Energy Density ◽  
Change Material ◽  
Storage Units

Latent heat storage units for refrigeration processes are promising as alternatives to water/glycol-based storage due to their significantly higher energy densities, which would lead to more compact and potentially more cost-effective storages. In this study, important thermophysical properties of five phase change material (PCM) candidates are determined in the temperature range between −22 and −35 °C and their compatibility with relevant metals and polymers is investigated. The goal is to complement existing scattered information in literature and to apply a consistent testing methodology to all PCMs, to enable a more reliable comparison between them. More specifically, the enthalpy of fusion, melting point, density, compatibility with aluminum, copper, polyethylene (PE), polypropylene (PP), neoprene and butyl rubber, are experimentally determined for 1-heptanol, n-decane, propionic acid, NaCl/water mixtures, and Al(NO3)3/water mixtures. The results of the investigations reveal individual strengths and weaknesses of the five candidates. Further, 23.3 wt.% NaCl in water stands out for its very high volumetric energy density and n-decane follows with a lower energy density but better compatibility with surrounding materials and supercooling performance. The importance of using consistent methodologies to determine thermophysical properties when the goal is to compare PCM performance is highlighted.

scholarly journals Reviewing the Exergy Analysis of Solar Thermal Systems Integrated with Phase Change Materials

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 724
Author(s):  
Macmanus Chinenye Ndukwu ◽  
Lyes Bennamoun ◽  
Merlin Simo-Tagne
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Second Law Of Thermodynamics ◽  
Heat Transfer Fluid ◽  
Solar Still ◽  
Thermal Systems ◽  
Solar Systems ◽  
Exergy Balance ◽  
Change Material

The application of thermal storage materials in solar systems involves materials that utilize sensible heat energy, thermo-chemical reactions or phase change materials, such as hydrated salts, fatty acids paraffin and non-paraffin like glycerol. This article reviews the various exergy approaches that were applied for several solar systems including hybrid solar water heating, solar still, solar space heating, solar dryers/heaters and solar cooking systems. In fact, exergy balance was applied for the different components of the studied system with a particular attention given to the determination of the exergy efficiency and the calculation of the exergy during charging and discharging periods. The influence of the system configuration and heat transfer fluid was also emphasized. This review shows that not always the second law of thermodynamics was applied appropriately during modeling, such as how to consider heat charging and discharging periods of the tested phase change material. Accordingly, the possibility of providing with inappropriate or not complete results, was pointed.

Numerical Thermal Performance Investigation of an Electric Motor Passive Cooling System Employing Phase Change Materials

2021 ◽  
Author(s):  
Ali Deriszadeh ◽  
Filippo de Monte ◽  
Marco Villani
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Electric Motor ◽  
Phase Change Materials ◽  
Cooling System ◽  
Passive Cooling ◽  
Time Step ◽  
Cooling Performance ◽  
Passive Cooling System ◽  
Change Material

Abstract This study investigates the cooling performance of a passive cooling system for electric motor cooling applications. The metal-based phase change materials are used for cooling the motor and preventing its temperature rise. As compared to oil-based phase change materials, these materials have a higher melting point and thermal conductivity. The flow field and transient heat conduction are simulated using the finite volume method. The accuracy of numerical values obtained from the simulation of the phase change materials is validated. The sensitivity of the numerical results to the number of computational elements and time step value is assessed. The main goal of adopting the phase change material based passive cooling system is to maintain the operational motor temperature in the allowed range for applications with high and repetitive peak power demands such as electric vehicles by using phase change materials in cooling channels twisted around the motor. Moreover, this study investigates the effect of the phase change material container arrangement on the cooling performance of the under study cooling system.

Preparation and Properties of Phase Change Thermal Insulation Materials

2018 ◽  
Vol 281 ◽  
pp. 131-136
Author(s):  
Shi Chao Zhang ◽  
Wei Wu ◽  
Yu Feng Chen ◽  
Liu Shi Tao ◽  
Kai Fang ◽  
...  
Keyword(s):  
Phase Change ◽  
Thermal Insulation ◽  
Calcium Silicate ◽  
Phase Change Materials ◽  
Performance Test ◽  
Thermal Protection ◽  
Insulation Material ◽  
Insulation Materials ◽  
Short Time ◽  
Change Material

With the increase of the speed of vehicle, the thermal protection system of its powerplant requires higher insulation materials. Phase change materials can absorb large amounts of heat in short time. So the introduction of phase change materials in thermal insulation materials can achieve efficient insulation in a limited space for a short time. In this paper, a new phase change thermal insulation material was prepared by pressure molding with microporous calcium silicate as matrix and Li2CO3 as phase change material. The morphology stability, exudation and heat insulation of the materials were tested. The results show that the porous structure of microporous calcium silicate has a good encapsulation when the phase transition of Li2CO3 is changed into liquid. And the material has no leakage during use. The thermal performance test also shows that the insulation performance of the material has obvious advantages in the short term application.

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