Structure and properties of phase change materials based on HDPE, soft Fischer-Tropsch paraffin wax, and wood flour

2010 ◽  
pp. n/a-n/a ◽  
Author(s):  
M. E. Mngomezulu ◽  
A. S. Luyt ◽  
I. Krupa
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Wood Flour ◽  
Paraffin Wax ◽  
Structure And Properties ◽  
Fischer Tropsch

scholarly journals Role of Phase Change Materials Containing Carbonized Rice husks on the Roof-Surface and Indoor Temperatures for Cool Roof System Application

Molecules ◽  
2020 ◽  
Vol 25 (14) ◽  
pp. 3280
Author(s):  
Hong Gun Kim ◽  
Yong-Sun Kim ◽  
Lee Ku Kwac ◽  
Mira Park ◽  
Hye Kyoung Shin
Keyword(s):  
Thermal Conductivity ◽  
Phase Change ◽  
Phase Change Materials ◽  
Paraffin Wax ◽  
Heat Absorption ◽  
Rice Husks ◽  
Indoor Temperature ◽  
Cool Roof ◽  
Plastic Composites

This study researches the effect of phase change materials (PCMs) containing carbonized rice husks (CRHs) in wood plastic composites (WPCs) as roof finishing materials on roof-surface and indoor temperatures. A cool roof miniature model was prepared, and measurements were taken using three fixed temperatures of 30 to 32 °C, 35 to 37 °C, and 40 to 42 °C. Sodium sulfate decahydrate (Na2SO4·10H2O) and paraffin wax were selected as the PCMs. CRHs were used as additives to improve the thermal conductivities of the PCMs. At lower fixed temperatures such as 30 to 32 °C and 35 to 37 °C, the rates of increase of the surface temperatures of roofs containing CRHs with Na2SO4·10H2O, and paraffin wax, were observed to gradually decrease compared to those of the roofs without PCMs. The indoor temperatures for the above-mentioned PCMs containing CRHs were maintained to be lower than those of the indoors without PCMs. Additionally, as the CRH content in the PCM increased, the rates of increase of the roof-surface and indoor temperatures decreased due to a faster roof heat absorption by PCMs through the improved thermal conductivity of CRHs. However, under higher artificial temperatures such as 40 to 42 °C, Na2SO4·10H2O with CRHs exhibited no effect due to being out of latent heat range of Na2SO4·H2O. For paraffin wax, as CRH content increased, their roof- surface and indoor temperatures decreased. Especially, the surface temperature of the roof containing paraffin contained 5 wt.% CRHs reduced by 11 °C, and its indoor temperature dropped to 26.4 °C. The thermal conductivity of PCM was enhanced by the addition of CRHs. A suitable PCM selection in each location can result in the reduction of the roof-surface and indoor temperatures.

Long-term thermophysical behavior of paraffin wax and paraffin wax/polyaniline (PANI) composite phase change materials

2020 ◽  
Vol 31 ◽  
pp. 101568
Author(s):  
Mathew George ◽  
A.K. Pandey ◽  
Nasrudin Abd Rahim ◽  
V.V. Tyagi ◽  
Syed Shahabuddin ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Paraffin Wax ◽  
Pani Composite ◽  
Composite Phase Change Materials

scholarly journals A Novel Polymeric Adsorbent Embedded with Phase Change Materials (PCMs) Microcapsules: Synthesis and Application

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 736 ◽  
Author(s):  
Xingang Li ◽  
Lingyu Sun ◽  
Hong Sui ◽  
Lin He ◽  
Wei Yuan ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Gas Adsorption ◽  
High Specific Surface Area ◽  
Paraffin Wax ◽  
Heat Of Fusion ◽  
Scanning Calorimetry ◽  
Polymeric Adsorbent ◽  
Adsorption Column ◽  
Dominant Structure

The heat released during the industrial gas adsorption (e.g., volatile organic compounds (VOCs)) on adsorbents (e.g., activated carbon) would lead to the risks of fire and explosion in the adsorption column. Herein, a novel highly-porous Vinylbenzyl chloride-Divinylbenzene (VBC-DVB) polymeric adsorbent was synthesized with embedded microcapsules (Hypercrosslinked VBC-DVB Beads (HVPM)). These microcapsules have a polydivinylbenzene-phase change materials (DVB-PCMs) core-shell structure. Paraffin wax was used as PCM filling in the spherical capsule. This microcapsules-embedded polymeric adsorbent HVPM (Φ1.5–2.0 mm) is found to possess a high specific surface area (~665 m²/g) and micropore-dominant structure. It also has heat storage capability indicated by DSC (Differential Scanning Calorimetry) analysis (11.1 J/g heat of fusion between 35.0 and 48.2 °C) for the encapsulated paraffin wax. The lab adsorption tests proved the capabilities of HVPM in adsorbing VOCs (toluene, 0.21 g/g) and controlling the temperature inside the adsorption column during the dynamic adsorption process, in which the temperature rise was lowered by 62.5%, relatively.

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