scholarly journals Neopentyl Glycol as Active Supporting Media in Shape-Stabilized PCMs

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3169 ◽  
Author(s):  
Angel Serrano ◽  
Jean-Luc Dauvergne ◽  
Stefania Doppiu ◽  
Elena Palomo Del Barrio
Keyword(s):  
Phase Transition ◽  
Phase Change Materials ◽  
Heat Storage ◽  
Solid Phase ◽  
High Energy ◽  
High Energy Density ◽  
Latent Heat Storage ◽  
Neopentyl Glycol ◽  
Solid Liquid ◽  
Latent Heats

The present work explores the feasibility of using polyalcohols with solid-solid phase transition as active supporting matrix of n-alkanes in shape-stabilized phase change materials (SSPCMs). It is well-established that the use of SSPCM avoids leakage and increases stability and easy handling of solid-liquid PCMs. Nevertheless, the resulting composite exhibits a loss of heat storage capacity due to the volume occupied by the supporting material, which does not contribute to latent heat storage. Therefore, the objective of this work is to combine solid-liquid PCMs (alkanes) with solid-solid PCMs (polyalcohols), both exhibiting a phase transition in the same range of temperature, to obtain high energy density SSPCMs. Towards that goal, the performance of Neopentyl Glycol (NPG) and Docosane as a new energetic SSPCM has been proved. The NPG-Docosane chemical compatibility and its outstanding wettability facilitate the propitious association of both materials. The higher capillary forces obtained by decreasing the NPG crystal size together with the addition of expanded graphite (EG) allowed to obtain a maximum Docosane content of 60 wt%. The addition of EG improves the shape stability at the time that increases the heat transfer properties of the composites. The analysis showed that the components of the obtained SSPCMs are able to combine their latent heats, achieving a maximum value of 210.74 J/g for the highest Docosane content. This value is much higher than those latent heats exhibited by existing SSPCMs in the same working temperature range.

Research and Application of Solid-Solid Phase Change as Energy Storage Materials

2014 ◽  
Vol 707 ◽  
pp. 85-89 ◽  
Author(s):  
Hua Li Wang ◽  
Shao Jie Liu ◽  
Feng Qing Zhao
Keyword(s):  
Phase Transition ◽  
Thermal Conductivity ◽  
Energy Storage ◽  
Heat Storage ◽  
Solid Phase ◽  
Energy Storage Materials ◽  
Practical Application ◽  
Latent Heat Storage ◽  
The Public ◽  
Advantages And Disadvantages

Latent heat storage is one of the most efficient ways of storing thermal energy. Compared with other kinds of PCMs, solid-solid PCMs have obvious advantages and have drawn more attention from the public. This paper reviews previous work on solid-solid PCMs. The advantages and disadvantages, as well as the preparation of three kinds of solid-solid PCMs were discussed. The problems associated with the application of PCMs with regards to the material and the methods used to contain them are also discussed. It is clear that solid-solid PCMs are promising, but possess the disadvantages as long phase transition time, low thermal conductivity, complexity and high cost. Therefore, there still much to do for solid-solid PCMs towards practical application in the future.

Zinc-rich eutectic alloys for high energy density latent heat storage applications

2017 ◽  
Vol 705 ◽  
pp. 714-721 ◽  
Author(s):  
E. Risueño ◽  
A. Faik ◽  
A. Gil ◽  
J. Rodríguez-Aseguinolaza ◽  
M. Tello ◽  
...  
Keyword(s):  
Energy Density ◽  
Latent Heat ◽  
Heat Storage ◽  
High Energy ◽  
High Energy Density ◽  
Eutectic Alloys ◽  
Latent Heat Storage

scholarly journals Triglycerides as Novel Phase-Change Materials: A Review and Assessment of Their Thermal Properties

Molecules ◽  
2020 ◽  
Vol 25 (23) ◽  
pp. 5572
Author(s):  
Rebecca Ravotti ◽  
Jörg Worlitschek ◽  
Colin R. Pulham ◽  
Anastasia Stamatiou
Keyword(s):  
Thermal Properties ◽  
Phase Change ◽  
Phase Change Materials ◽  
Waste Heat ◽  
High Energy ◽  
High Energy Density ◽  
Melting Points ◽  
Latent Heat Storage ◽  
Chemical Structures ◽  
Energy Technologies

Latent Heat Storage (LHS) with Phase-Change Materials (PCMs) represents a high energy density storage technology which could be applied in a variety of applications such as waste heat recovery and integration of renewable energy technologies in energy systems. To increase the sustainability of these storage solutions, PCMs have to be developed with particular regard to bio-origin and biodegradability. Triglycerides represent an interesting class of esters as the main constituents of animal and vegetable fats, with attractive thermal properties. In order to be used as PCMs, the thermal behaviour of triglycerides has to be fully understood, as in some cases they have been reported to show polymorphism and supercooling. This study assesses the suitability of triglycerides as PCMs by reviewing the literature published so far on their behaviour and properties. In particular, melting points, enthalpies of fusion, polymorphism, thermal conductivities, heat capacities and thermal cycling stabilities are considered, with a focus on LHS and thermal energy storage applications. In addition, the efforts conducted regarding modelling and the prediction of melting points and enthalpies based on chemical structures are summarized and assessed.

Modeling and Simulation of Phase Change Materials: Application to Building with Low Energy Consumption

2019 ◽  
Vol 297 ◽  
pp. 187-194
Author(s):  
Izzeddine Saouane ◽  
Abla Chaker ◽  
Tarek Messai ◽  
Hichem Farh
Keyword(s):  
Energy Consumption ◽  
Phase Change ◽  
Phase Change Materials ◽  
Heat Storage ◽  
Liquid Interface ◽  
Latent Heat Storage ◽  
Change Behavior ◽  
The One ◽  
Solid Liquid Interface ◽  
Solid Liquid

The use of phase change materials must allow storage / destocking of energy from solar or internal gains. The applications in the case of light constructions will lead to an improvement in the thermal comfort of users and a reduction in energy consumption. The use of phase change materials (PCMs) in the energy-saving walls themselves makes it possible to substitute sensible heat storage for latent heat storage which requires a much lower volume and mass for the same amount of thermal energy. The objective of this work is the study of heat transfer by conduction during a phase change, and aims on the one hand to model and simulate the phase change behavior and on the other hand to approach the mechanism of heat exchange at the solid-liquid interface. The results obtained in 2D show the temporal evolution of the temperature, the position and the speed of the solid-liquid interface.

scholarly journals Numerical study on Finned Latent Heat Storage for Tri-generation System

2018 ◽  
Vol 4 (2) ◽  
pp. 119-129
Author(s):  
Guangya Zhu ◽  
Tin-Tai Chow
Keyword(s):  
Heat Transfer ◽  
Numerical Model ◽  
Latent Heat ◽  
Heat Storage ◽  
High Energy ◽  
Pollutant Emissions ◽  
High Energy Density ◽  
Distinct Advantage ◽  
Generation System ◽  
Latent Heat Storage

Tri-generation system combines the supply of electric power, heating and cooling energy into one single system. Compared to the separated energy generation systems, the advantages lie in its higher efficiency, reliability and flexibility, as well as the reduced pollutant emissions. Yet the mismatch in system electricity and thermal demands often downgrades its effectiveness and economic merits. At this end, the adoption of thermal energy storage can be a practical means of improvement. Among the various choices, the finned latent heat storage using phase change material is distinct advantage owing to its high energy density. On the other hand, the finned latent heat storage design requires a detailed analysis of the heat transfer process. In this paper, our numerical model is introduced for use in simulating the associated complex heat transfer processes. The accuracy of the numerical model has been verified making use of the published experimental data available from the literature. Furthermore, our follow-up parametric study shows that the increase of fin thickness will improve the heat transfer performance for a given design configuration and the better heat transfer can be achieved with the reduction in fin length and fin spacing as well.

scholarly journals Solvothermal method as a green chemistry solution for micro-encapsulation of phase change materials for high temperature thermal energy storage

2018 ◽  
Vol 5 ◽  
pp. 4 ◽  
Author(s):  
Albert Ioan Tudor ◽  
Adrian Mihail Motoc ◽  
Cristina Florentina Ciobota ◽  
Dan. Nastase Ciobota ◽  
Radu Robert Piticescu ◽  
...  
Keyword(s):  
High Temperature ◽  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Solvothermal Method ◽  
High Energy ◽  
High Energy Density ◽  
Latent Heat Storage

Thermal energy storage systems using phase change materials (PCMs) as latent heat storage are one of the main challenges at European level in improving the performances and efficiency of concentrated solar power energy generation due to their high energy density. PCM with high working temperatures in the temperature range 300–500 °C are required for these purposes. However their use is still limited due to the problems raised by the corrosion of the majority of high temperature PCMs and lower thermal transfer properties. Micro-encapsulation was proposed as one method to overcome these problems. Different micro-encapsulation methods proposed in the literature are presented and discussed. An original process for the micro-encapsulation of potassium nitrate as PCM in inorganic zinc oxide shells based on a solvothermal method followed by spray drying to produce microcapsules with controlled phase composition and distribution is proposed and their transformation temperatures and enthalpies measured by differential scanning calorimetry are presented.

scholarly journals Developing Next Generation Phase Change Materials for Heat Storage Applications

2014 ◽  
Vol 70 (a1) ◽  
pp. C50-C50
Author(s):  
Rowan Clark ◽  
Colin Pulham
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Heat Storage ◽  
Variable Temperature ◽  
Inorganic Compounds ◽  
High Energy ◽  
Crystal Nucleation ◽  
Valuable Insight ◽  
Latent Heat Storage ◽  
Wide Range

A large proportion of energy consumption in the UK is in the form of heat, associated with domestic and commercial heating of buildings, and the heating requirements for a wide range of industrial processes. Since many heating requirements rely ultimately on the combustion of fossil fuels, inevitably this has a major impact on the release of CO2. Furthermore, with the ever-increasing price of fuel and electricity, there are significant economic impacts for both domestic and industrial consumers. Hence there is a very strong driver towards the exploitation of renewable heat, and a key challenge for renewable heat must be effective heat storage. Latent heat storage systems have the potential to be more economical and reduce CO2 emissions compared to heating systems currently used in homes and industry. Phase-change materials (PCMs) are the key materials used in the technology, and can include organic compounds such as waxes and sugar alcohols, and inorganic compounds such as salt hydrates. On melting these materials absorb heat and on freezing they release heat. This poster describes the development of new PCMs based on hydrates of magnesium , calcium, and strontium compounds which have tailored properties such as specific melting temperature ranges, improved long-term stabilities (over many heating and cooling cycles), and high energy densities. Variable temperature crystallographic studies (single crystal and powder X-ray diffraction) provide valuable insight into phenomena such as incongruent melting, supercooling, the appearance of intermediate hydrates, and the effects of additives that promote crystal nucleation. Such information leads to a better understanding of the behaviour of these PCMs, ultimately leading to more effective methods for heat storage.

scholarly journals Experimental Analysis of the Latent Heat Storage System (LHS) Using Paraffin Wax as Phase Change Material

2021 ◽  
Vol 9 (VIII) ◽  
pp. 234-241
Author(s):  
Mr. Omkar Jadhav
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Latent Heat ◽  
Phase Change Materials ◽  
Heat Storage ◽  
Storage System ◽  
High Energy ◽  
Paraffin Wax ◽  
Latent Heat Storage ◽  
Change Material

An experimental study using paraffin wax as a phase change material (PCM) was performed to analyse thermal physiognomies on the latent heat storage system (LHS). The use of phase change materials through latent heat storage is an unusual approach to maintaining thermal energy. There is the advantage of considerably high energy storage and the uniform temperature of the storage process. Tube & shell type heat exchanger (HE) has been used in this experimentation. Water circulates in tubes and around the tube’s paraffin wax as phase change material is filled. The focus is on heating (charging) and cooling (discharging) of PCM (paraffin wax), which is the melting and solidifying of paraffin wax. The temperature distribution in paraffin is studied consistent with the various flow rates of the warmth transfer fluid.

Selection of Phase Change Materials for Latent Heat Storage

2017 ◽  
Vol 13 (1) ◽  
Author(s):  
J. Martínez-Gómez ◽  
E. Urresta ◽  
D. Gaona ◽  
G. Guerrón
Keyword(s):  
Phase Change ◽  
Latent Heat ◽  
Phase Change Materials ◽  
Heat Storage ◽  
Latent Heat Storage ◽  
Toma De Decisiones ◽  
Selection Of

Esta investigación tiene como objetivo seleccionar un material de cambio de fase (PCM) que cumplen mejor la solución del almacenamiento de energía térmica entre 200-400 ° C y reducir el costo de producción. El uso de métodos multicriterios de toma de decisiones (MCMD) para la evaluación fueron proporcionales implementados como COPRAS-G, TOPSIS y VIKOR. La ponderación de los criterios se realizó por el método AHP (proceso analítico jerárquico) y los métodos de entropía. La correlación de los resultados entre los tres métodos de clasificación ha sido desarrollada por el coeficiente de correlación de Spearman. Los resultados ilustran el mejor y la segundo mejor opción para los tres MCDM fueron NaOH y KNO3. Además, tenía valores de correlación de Spearman entre los métodos excede de 0.714.

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