Development of spherical α-Al2O3-based composite phase change materials (PCMs) and its utilization in thermal storage building materials

2019 ◽  
Vol 676 ◽  
pp. 177-185 ◽  
Author(s):  
Wenjuan Miao ◽  
Yingbin Wang ◽  
Xiangguo Li ◽  
Shulie Gan ◽  
Yang Lv ◽  
...  
Keyword(s):  
Phase Change ◽  
Building Materials ◽  
Phase Change Materials ◽  
Thermal Storage ◽  
Composite Phase Change Materials ◽  
Α Al2o3

Composite phase change materials improve the photo-thermal effects of cotton fabrics

2020 ◽  
pp. 004051752097561
Author(s):  
Wei Zhang ◽  
Shang Hao ◽  
Jiali Weng ◽  
Yibo Zhang ◽  
Jiming Yao ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Surface Temperature ◽  
Ambient Temperature ◽  
Phase Change ◽  
Latent Heat ◽  
Thermal Effects ◽  
Phase Change Materials ◽  
Thermal Storage ◽  
Cotton Fabrics ◽  
Composite Phase Change Materials

We report on the impregnation-based preparation of composite phase change materials (CPCMs) with thermal storage properties, using paraffin wax and multi-walled carbon nanotubes (MWCNTs). We coated the CPCMs on the fabric by scraper coating, then evaluated their shape stability, latent heat, thermal conductivity, thermal storage stability and photo-thermal effects. Results show that CPCMs with 10% acid-oxidized MWCNTs introduce only a small phase leakage when heated at 50℃ for 900 s; their latent heat energy reduces by 16.5%, while their thermal conductivity increases by 131.9% compared to pure paraffin. When exposed to sunlight at an ambient temperature of 12.5℃, the cotton fabrics coated with CPCMs record a 12.8℃ higher surface temperature than the pristine fabric, while their heat dissipation is delayed by 120–180 s. The fabric surface temperature increases to twice the ambient temperature during daytime. Overall, these findings indicate that the coated fabric has excellent thermal stability, affirming its potential as photo-thermal functional material.

Thermal Storage and Release Properties of Aluminum Foam - Paraffin Composite Phase Change Materials

2013 ◽  
Vol 668 ◽  
pp. 42-47
Author(s):  
Xiao Xu Luo ◽  
Xiao Qing Zuo ◽  
Ming Wei Zhao
Keyword(s):  
Phase Change ◽  
Storage Time ◽  
Aluminum Foam ◽  
Phase Change Materials ◽  
Volume Ratio ◽  
Thermal Storage ◽  
Release Time ◽  
Equivalent Thermal Conductivity ◽  
Thermal Release ◽  
Composite Phase Change Materials

Aluminum foam-Paraffin Composite Phase Change Materials (APCPCMs) were fabricated by aluminum foam and paraffin, and the thermal storage and thermal release properties of the composites have been studied. The results are shown as follows. (1) When the volume ratio between APCPCM and water is 1:4, the time for the temperature changing of APCPCMs with aluminum foam porosity being 54.81%, 60.52%, 64.37% and 69.74%, from 24°C to 66°C, is 190s, 305s, 380s and 395s respectively. The thermal release time of these APCPCMs is 270s, 355s, 540s and 600s after being put into 24°C water, and resulting in a water temperature increase by 8.2°C, 8.7°C, 9.4°C and 10.1°Crespectively. (2) APCPCM with aluminum foam porosity 60.52% is compared with aluminum foam and paraffin, the thermal storage time of these three kinds of materials is 305s, 60s, 870s, and the thermal release time is 355s, 30s, 1470s respectively. (3) The equivalent thermal conductivity coefficient of the APCPCMs with aluminum foam porosity ranging form 69.74% to 54.81% is between 61.16 W•m-1•k-1 to 91.4W•m-1•k-1.

Research Development and Application of Solar Thermal Storage With Phase Change Materials

2010 ◽  
Author(s):  
Fang Liu ◽  
Hao Liang ◽  
Hang Yu ◽  
Xiaomei Tang
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Phase Change Materials ◽  
Thermal Storage ◽  
The Other ◽  
Solar Thermal ◽  
Economic Research ◽  
Research Development ◽  
Storage Technology ◽  
Composite Phase Change Materials

Research on efficient and economical thermal storage technology becomes common issue to the scholars. Especially research on PCMs becomes hot spot these years. In view of the discontinuity and instability of solar energy, efficient and economic research on energy storage technology occupies a very important position. This article summarizes and evaluates the research development and applications of solar thermal storage technology with PCMs both in China and the other countries. Including four parts: A review on preparation of new composite phase change materials and its thermophysical properties was carried out. Various heat transfer enhancement technology was overviewed. Including adding metal fill, adding graphite, capsule package, plus fins, adding carbon fiber and composite phase change materials, etc. Mathematical modeling of a latent heat thermal energy storage system (LHTES) was reviewed in recent years which is used for the optimum material selection and to assist in the optimal designing of the systems. The important characteristics of different models and their assumptions used are presented and discussed, the experimental validation of some models are also presented. The applications and prospects of PCMs used in the different fields were summarized, such as industry, agriculture, construction, textiles, electronic products, medicine, transportation etc. Finally, conclusions and perspectives were drawed. Hope to provide references to the other researchers in this field.

Enhance the Thermal Storage of Cement-Based Composites With Phase Change Materials and Carbon Nanotubes

2013 ◽  
Vol 135 (2) ◽  
Author(s):  
Baoguo Han ◽  
Kun Zhang ◽  
Xun Yu
Keyword(s):  
Carbon Nanotubes ◽  
Phase Change ◽  
Building Materials ◽  
Phase Change Materials ◽  
Cement Mortar ◽  
Construction Materials ◽  
Thermal Storage ◽  
Building Models ◽  
Scale Down ◽  
Mechanical Performances

Phase change materials (PCM) have been incorporated with cementitious construction materials to store thermal energy and control interior climate in buildings, which can reduce the energy consumption and improve thermal comfort. However, addition of PCM is found to decrease strength and thermal conductivity of the cement-based composite. Carbon nanotubes (CNT) are integrated into cementitious construction materials with microencapsulated PCM to improve their thermal-conductive and mechanical performances. Results of lab and outdoor tests show the modified cement mortar containing both PCM and CNT exhibits better heat insulation properties than plain cement mortar. A temperature difference up to 6.8 °C was observed between interiors of two same size scale-down building models (one made of plain cement mortar, the other one made of cement mortar with PCM and CNT). This indicates that the modified cement mortar can effectively enhance the thermal storage property of cement-based building materials.

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