Fatty Amines As a New Family of Organic Phase Change Materials with Exceptionally High Energy Density at Ambient Temperature

2019 ◽  
Author(s):  
Tao Chen ◽  
Hanxue Sun ◽  
Peng Mu ◽  
Zhaoqi Zhu ◽  
Junru An ◽  
...  
Keyword(s):  
Energy Density ◽  
Ambient Temperature ◽  
Phase Change ◽  
Organic Phase ◽  
Phase Change Materials ◽  
High Energy ◽  
High Energy Density ◽  
New Family ◽  
Fatty Amines

Supercritical Impregnation of Organic Phase Change Materials into Polyester Fiber

2007 ◽  
Vol 544-545 ◽  
pp. 853-856
Author(s):  
Chang Sik Ju ◽  
Tae Won Kim ◽  
Si Young Kim
Keyword(s):  
High Pressure ◽  
Phase Change ◽  
Organic Phase ◽  
Phase Change Materials ◽  
High Energy ◽  
Polyester Fiber ◽  
High Pressure Pump ◽  
Supercritical Impregnation ◽  
A New Technique ◽  
Paraffin Waxes

A new technique preparing polyester fiber impregnated with organic phase change material(PCM) was proposed and experimentally examined. The impregnation apparatus consisted of a high pressure pump, two consecutive high pressure cylinders and auxiliary facilities. Polyester fiber was bound on cylindrical stainless steel net inside equilibrium cylinder and was impregnated with supercritical solution of PCM. PCMs, paraffin waxes and organic acids, were successfully impregnated into the polyester fiber even at temperature below it’s glass transition temperature(Tg), and the impregnated fibers showed high energy storage and release capacity around the melting point of respective PCMs.

Phase Change Slurries as Cold Storage Fluid with High Energy Density for Solar Cooling

2011 ◽  
Author(s):  
Tobias Kappels ◽  
Ziad Youssef ◽  
Clemens Pollerberg ◽  
Lucian George Hanu ◽  
Anthony Delahaye ◽  
...  
Keyword(s):  
Energy Density ◽  
Phase Change ◽  
Cold Storage ◽  
High Energy ◽  
High Energy Density ◽  
Solar Cooling

Computational insight into a new family of functionalized tetrazole-N-oxides as high-energy density materials

2019 ◽  
Vol 43 (42) ◽  
pp. 16454-16460
Author(s):  
Piao He ◽  
Jingjie Han ◽  
Jinting Wu ◽  
Haozheng Mei ◽  
Jianguo Zhang
Keyword(s):  
Energy Density ◽  
Environmentally Friendly ◽  
High Energy ◽  
High Energy Density ◽  
Excellent Performance ◽  
New Family ◽  
High Energy Density Materials ◽  
Insight Into

A new family of energetic derivatives based on functionalized tetrazole-N-oxides was designed, and their properties were extensively investigated. The excellent performance makes them promising candidates for new environmentally friendly HEDMs.

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.

Compact Heat Storage for Solar Heating Systems

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
Viktoria Martin ◽  
Fredrik Setterwall
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Average Power ◽  
High Capacity ◽  
High Energy ◽  
Finned Tube ◽  
Hot Water ◽  
High Energy Density ◽  
Power Capacity ◽  
Tube Heat Exchanger

Energy and cost efficient solar hot water systems require some sort of integrated storage, with high energy density and high power capacity for charging and discharging being desirable properties of the storage. This paper presents the results and conclusions from the design, and experimental performance evaluation of high capacity thermal energy storage using so-called phase change materials (PCMs) as the storage media. A 140 l 15 kW  h storage prototype was designed, built, and experimentally evaluated. The storage tank was directly filled with the PCM having its phase change temperature at 58°C. A tube heat exchanger for charging and discharging with water was submerged in the PCM. Results from the experimental evaluation showed that hot water can be provided with a temperature of 40°C for more than 2 h at an average power of 3 kW. The experimental results also show that it is possible to charge the 140 l storage with close to the theoretically calculated value of 15 kW h. Hence, this is a PCM storage solution with a storage capacity of over 100 kW h/m3, and an average power capacity during discharging of over 20 kW/m3. However, it is desirable to increase the heat transfer rate within the prototype. A predesign of using a finned-tube coil instead of an unfinned coil show that by using finned tube, the power capacity for discharging can be at least doubled, if not tripled.

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.

Comparison of Stratification in a Water Tank and a PCM-Water Tank

2009 ◽  
Vol 131 (2) ◽  
Author(s):  
A. Castell ◽  
C. Solé ◽  
M. Medrano ◽  
M. Nogués ◽  
L. F. Cabeza
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Phase Change Materials ◽  
High Energy ◽  
Hot Water ◽  
The Other ◽  
High Energy Density ◽  
Water Tank ◽  
Charging And Discharging Processes ◽  
Thermal Energy Storage Systems

Most of the thermal energy storage systems available on the market use water as a storage medium. The improvement of the storage efficiency results in a higher performance of the whole system, and thermal stratification is commonly used for this purpose. On the other hand, in applications with small temperature changes, phase change materials (PCMs) provide high energy density since the latent heat is much larger than the sensible heat. This is the case of stratified hot water tanks, where the temperature change in the top layer is small as it is held close to the usage temperature. The benefits of using PCMs in a water tank, in terms of energy storage density, have been demonstrated before. The time with available hot water is increased because of the energy stored in the PCMs. The aim of this work is to demonstrate that the use of PCMs in the upper part of a water tank holds or improves the benefit of the stratification phenomenon. Two tanks with the same dimensions were compared during charging and discharging processes. One of them is a traditional water tank and the other is a PCM-water tank (a water tank with a phase change material placed at the top).

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