Novel facile self-assembly approach to construct graphene oxide-decorated phase-change microcapsules with enhanced photo-to-thermal conversion performance

2018 ◽  
Vol 6 (10) ◽  
pp. 4535-4543 ◽  
Author(s):  
Kunjie Yuan ◽  
Jian Liu ◽  
Xiaoming Fang ◽  
Zhengguo Zhang
Keyword(s):  
Graphene Oxide ◽  
Phase Change ◽  
Self Assembly ◽  
Storage Capacity ◽  
Heat Storage ◽  
Thermal Conversion ◽  
Thermal Reliability ◽  
Encapsulation Rate ◽  
Large Heat ◽  
Conversion Performance

Novel self-assembled phase change microcapsule exhibits high encapsulation rate, large heat storage capacity, good thermal reliability and enhanced photo-thermal performance.

PHASE-CHANGE MATERIAL: NATURAL RUBBER COMPOSITES FOR HEAT STORAGE APPLICATIONS

2020 ◽  
Vol 93 (1) ◽  
pp. 208-221 ◽  
Author(s):  
Minna Poikelispää ◽  
Sasu Ruokangas ◽  
Mari Honkanen ◽  
Minnamari Vippola ◽  
Essi Sarlin
Keyword(s):  
Natural Rubber ◽  
Phase Change ◽  
Thermal Energy ◽  
Elevated Temperatures ◽  
Storage Capacity ◽  
Heat Storage ◽  
Damping Properties ◽  
Rubber Composites ◽  
Good Ability ◽  
Natural Rubber Composites

ABSTRACT Global warming and environmental awareness in general have increased the research into thermal energy storage fields. Phase-change materials (PCMs) are efficient in storing thermal energy because of their high latent heat during the phase change. As the phase change is often based on the melting of the PCM, they need to be encapsulated, for example, by dispersing the PCM to a polymer matrix. In this study, the feasibility of the use of paraffin–natural rubber composites in applications requiring both the good ability to store heat energy and good vibration-damping properties is studied. This includes studies on PCM concentration and the microencapsulation of the PCM. It was found that the heat storage capacity increases with increasing PCM content, although the theoretical maximum capacity is not achieved because the PCM is released during vulcanization and the paraffin blooms. In addition, the loss factor was found to be increased at elevated temperatures, indicating improved damping properties. The encapsulation of PCM is found to have a positive influence on the heat storage capacity and the mechanical and damping properties of the rubber compound.

scholarly journals Numerical Analysis of the Energy Improvement of Plastering Mortars with Phase Change Materials

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
A. Váz Sá ◽  
R. M. S. F. Almeida ◽  
H. Sousa ◽  
J. M. P. Q. Delgado
Keyword(s):  
Phase Change ◽  
Energy Demand ◽  
Phase Change Materials ◽  
Storage Capacity ◽  
Heat Storage ◽  
Indoor Temperature ◽  
Ambient Temperatures ◽  
Simulation Tools ◽  
Building Components ◽  
Cooling Energy Demand

Building components with incorporated phase change materials (PCMs) meant to increase heat storage capacity and enable stabilization of interior buildings surface temperatures, whereby influencing the thermal comfort sensation and the stabilization of the interior ambient temperatures. The potential of advanced simulation tools to evaluate and optimize the usage of PCM in the control of indoor temperature, allowing for an improvement in the comfort conditions and/or in the cooling energy demand, was explored. This paper presents a numerical and sensitivity analysis of the enthalpy and melting temperature effect on the inside building comfort sensation potential of the plastering PCM.

Test and Select of Carrier of Phase Change Materials for Asphalt Mixtures

2012 ◽  
Vol 511 ◽  
pp. 60-63
Author(s):  
Yu Zheng Ren ◽  
Jie Zhu Liu ◽  
Biao Ma ◽  
Sha Sha Wang
Keyword(s):  
Carbon Black ◽  
Phase Change ◽  
Phase Change Materials ◽  
Storage Capacity ◽  
Heat Storage ◽  
Physical Adsorption ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Adsorption Method ◽  
Micro Morphology

Directly mixing the PCM to asphalt mixture may adversely affect mixture performance. By the experiment of SEM, the diffusion-absorption circle testing and the DSC, the micro-morphology and the adsorption characteristics to PCM of four carriers and the thermal properties of the composite shape-stabilized phase change materials (CSPCM) were analyzed. The results showed that the activated carbon, the floating bead and the white carbon black have more developed porous structure. The white carbon black has the best effect on the adsorption of PCM. The shape-stabilized PCM prepared by the physical adsorption method has the leakage problem. The CSPCM with the white carbon black carrier has the best heat storage capacity. The white carbon black is the best carrier of PCM for asphalt mixture.

Thermometric Studies of Newly Developed Nanolubricants

2016 ◽  
Author(s):  
Sayavur I. Bakhtiyarov ◽  
Elguja R. Kutelia ◽  
Dennis A. Siginer
Keyword(s):  
Storage Capacity ◽  
Heat Storage ◽  
Vapor Pressures ◽  
Scanning Calorimetry ◽  
Modulated Differential Scanning Calorimetry ◽  
Flow Measurements ◽  
Heat Transfer Fluids ◽  
Large Heat ◽  
New Space ◽  
Space Vacuum

One of the primary requirements of space lubricants is that they have extremely low vapor pressures to withstand the space vacuum environment. Nanolubricants are known to have extremely low vapor pressure and some have attractive lubricant properties such as low coefficient of friction and good lifetimes. However, many other physical properties need to be evaluated in bringing forth new space liquid lubricants such as wide liquid temperature range and adequate heat transmission capabilities. The heat capacity and heat flow measurements for two newly developed nanolubricants Kolkhida 1 and Kolkhida 2 were conducted using Modulated Differential Scanning Calorimetry (MDSC). The experimental results revealed that the tested ionic liquids have large heat storage capacity as compare to the conventional heat transfer fluids.

scholarly journals Evaluation of Energy Performance and Thermal Comfort Considering the Heat Storage Capacity and Thermal Conductivity of Biocomposite Phase Change Materials

Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2191
Author(s):  
Su-Gwang Jeong ◽  
Taemin Lee ◽  
Jeonghun Lee
Keyword(s):  
Thermal Conductivity ◽  
Energy Consumption ◽  
Thermal Comfort ◽  
Phase Change ◽  
Chemical Stability ◽  
Phase Change Materials ◽  
Storage Capacity ◽  
Heat Storage ◽  
Building Energy ◽  
Vacuum Impregnation

The application of phase change materials (PCMs) has been verified as an effective strategy for improving energy efficiency and reducing greenhouse gas emissions. Biocomposite PCMs (Bc-PCM) exhibit large latent heat, chemical stability, and a wide temperature range. In this study, thermal conductivity improved Bc-PCM (TBc-PCM) was made via vacuum impregnation with graphene nanoplatelets (GNPs). Chemical stability analysis and thermal performance analyses of the Bc-PCM and TBc-PCM were carried out as well as building energy simulations and thermal comfort analyses. Our results show Bc-PCM showed a higher heat storage capacity and enthalpy value compared to TBc-PCM. TBc-PCM exhibited a 378% increase in thermal conductivity compared to Bc-PCM. Building energy simulation results revealed that annual heating and cooling energy consumption decreased as the thickness of the PCM layer increased. In addition, the Bc-PCM with a larger PCM capacity was more effective in reducing energy consumption during the heating period. On the other hand, the cooling energy reduction effect was greater when TBc-PCM with high thermal conductivity was applied because of the high heat transfer during the cooling period. Thermal comfort evaluation revealed it was more comfortable when PCM was applied.

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