Microencapsulation of n-hexadecane as phase change material by suspension polymerization

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Ai Yafei ◽  
Jin Yong ◽  
Sun Jing ◽  
Wei Deqing
Keyword(s):  
Melting Point ◽  
Phase Change ◽  
Phase Change Material ◽  
Latent Heat ◽  
Suspension Polymerization ◽  
Average Diameter ◽  
Heat Of Fusion ◽  
Synthetic Surfactant ◽  
Scanning Calorimetry ◽  
Change Material

AbstractIn this study, suspension polymerization is described to fabricate microcapsules containing n-hexadecane as phase change material. In the suspension polymerization, casein is employed as emulsifier and stabilizer instead of synthetic surfactant. Microcapsules with polystyrene as shell and n-hexadecane as core have an average diameter of 3~15μm and the size distribution are narrow. Thermal properties are investigated by differential scanning calorimetry (DSC) showing that the microcapsules can store and release an amount of latent heat over a temperature range nearing the melting point of pure n-hexadecane. The latent heat of fusion of microencapsulated n-hexadecane decreases after microencapsulation. The melting point of microencapsulated n-hexadecane is near but higher than that of pure n-hexadecane, and the polymerization time has little effect on the melting point.

Thermal Behavior of Phase Change Material During Charging Inside a Finned Cylindrical Latent Heat Energy Storage System: Effects of the Arrangement and Number of Fins

2010 ◽  
Author(s):  
Dominic Groulx ◽  
Wilson Ogoh
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Latent Heat ◽  
Storage System ◽  
Heat Energy ◽  
Hot Water ◽  
Heat Of Fusion ◽  
Melting Front ◽  
Change Material

One way of storing thermal energy is through the use of latent heat energy storage systems. One such system, composed of a cylindrical container filled with paraffin wax, through which a copper pipe carrying hot water is inserted, is presented in this paper. It is shown that the physical processes encountered in the flow of water, the heat transfer by conduction and convection, and the phase change behavior of the phase change material can be modeled numerically using the finite element method. Only charging (melting) is treated in this paper. The appearance and the behavior of the melting front can be simulated by modifying the specific heat of the PCM to account for the increased amount of energy, in the form of latent heat of fusion, needed to melt the PCM over its melting temperature range. The effects of adding fins to the system are also studied, as well as the effects of the water inlet velocity.

Thermophysical Properties of Nanoparticles-Phase Change Material Compositions for Thermal Energy Storage

2012 ◽  
Vol 232 ◽  
pp. 127-131 ◽  
Author(s):  
Saw Chun Lin ◽  
Hussain Hamoud Al-Kayiem
Keyword(s):  
Melting Point ◽  
Phase Change ◽  
Phase Change Material ◽  
Copper Powder ◽  
Paraffin Wax ◽  
Heat Of Fusion ◽  
Transmission Electron ◽  
Three Samples ◽  
Solar Research ◽  
Change Material

Utilizing the Phase change material or PCM as thermal storage in solar research has been widely focused. Some researches embedded metal and non-metal Nanoparticles into the PCM to investigate the effect on the thermal properties of the mixtures. In this study, copper nanoparticles are dispersed into paraffin wax to form Nanoparticles-PCM mixture. Three samples have been prepared: Sample 1 is paraffin wax only, Sample 2 is 1% 20nm copper powder + 150 ml paraffin wax, and Sample 3 is 2% 20nm copper powder + 150 ml paraffin wax. Differential Scanning Calorimeter is used to analyse the melting point, solidification point and specific heat of mixture. Transmission Electron Microscopy is used to identify the shape and size of 20nm copper powder. The study showed that thermal conductivity of Nanoparticles-PCM mixture was increased as well as the sensible heat. However, there is reduction in the melting point and heat flow to melt the Nanomaterials but latent heat of fusion was increased. 20nm copper powder is proven to be suspended in the paraffin wax.

scholarly journals Cooling of Motorcycle Helment Using Phase Change Material

2011 ◽  
pp. 89-93
Author(s):  
S. Vaitheeswaran ◽  
C. Suresh Kumar ◽  
S. Santhosh ◽  
S. Sathish Kumar
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Latent Heat ◽  
Human Life ◽  
Ventilation System ◽  
Heat Of Fusion ◽  
Road Accidents ◽  
Latent Heat Of Fusion ◽  
Excessive Heat ◽  
Change Material

Human life is so precious and valuable, that it should not be compromised under any cost. In a latest survey, it is mentioned that nearly 62% of mortality in road accidents occur due to head injury, where the rider has not worn a helmet. It is not that people are very negligent about their lives on road, but that they experience dozens of discomforts by wearing helmets. But the most common discomfort is that, heavy sweat occurs due to excessive heat formation. This project mainly focuses on absorbing this heat produced inside the helmet. To achieve this, a suitable Phase change material (HS 22) is encapsulated inside an aluminium packet. Also 6 holes of 6mm diameter are drilled on the front and rear sides of helmet. This allows fresh air (reaction air coming opposite to riding direction) to continuously flow in and out of the helmet so that the heat produced in the helmet is instantaneously tapped out. During summer season, the inlet air itself will be hot which will be absorbed by the PCM. The PCM fuses taking its latent heat of fusion from the packet surface and cools it. Thus continuous cooling is achieved till the entire PCM fuses. After the ride, the PCM rejects the heat and again solidifies. Factors like position of PCM in the helmet, volume, latent heat of fusion, etc. are carefully adjusted to achieve effective forced convective heat transfer and thus cooling for a minimum drive of 1.5 hours at an utmost ambient temperature of 450C. This ventilation system is practically feasible, very economical and will surely promote the riders to wear helmets. This project has been successfully completed as our 3rd year project.

Latent heat of fusion prediction for nanofluid based phase change material

2018 ◽  
Vol 130 ◽  
pp. 1590-1597 ◽  
Author(s):  
Jotham Muthoka Munyalo ◽  
Xuelai Zhang ◽  
Yuyang Li ◽  
Yue Chen ◽  
Xiaofeng Xu
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Latent Heat ◽  
Heat Of Fusion ◽  
Latent Heat Of Fusion ◽  
Change Material

Estimation of Melting Point/Latent Heat of Binary Mixtures of Phase Change Material of Erythritol and Polyalcohol

2006 ◽  
Vol 32 (5) ◽  
pp. 429-434 ◽  
Author(s):  
Hiroyuki Nakada ◽  
Mitsuhiro Kubota ◽  
Fujio Watanabe ◽  
Hitoki Matsuda ◽  
Erwin P. Ona ◽  
...  
Keyword(s):  
Melting Point ◽  
Phase Change ◽  
Phase Change Material ◽  
Binary Mixtures ◽  
Latent Heat ◽  
Change Material

scholarly journals Flexible Phase Change Material Fiber: A Simple Route to Thermal Energy Control Textiles

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 401
Author(s):  
Yurong Yan ◽  
Weipei Li ◽  
Ruitian Zhu ◽  
Chao Lin ◽  
Rudolf Hufenus
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Latent Heat ◽  
Bubble Formation ◽  
Decomposition Temperature ◽  
Scanning Calorimetry ◽  
Latent Heat Storage ◽  
Heating And Cooling ◽  
Polyethylene Glycol 1000 ◽  
Change Material

A flexible hollow polypropylene (PP) fiber was filled with the phase change material (PCM) polyethylene glycol 1000 (PEG1000), using a micro-fluidic filling technology. The fiber’s latent heat storage and release, thermal reversibility, mechanical properties, and phase change behavior as a function of fiber drawing, were characterized. Differential scanning calorimetry (DSC) results showed that both enthalpies of melting and solidification of the PCM encased within the PP fiber were scarcely influenced by the constraint, compared to unconfined PEG1000. The maximum filling ratio of PEG1000 within the tubular PP filament was ~83 wt.%, and the encapsulation efficiencies and heat loss percentages were 96.7% and 7.65% for as-spun fibers and 93.7% and 1.53% for post-drawn fibers, respectively. Weak adherence of PEG on the inner surface of the PP fibers favored bubble formation and aggregating at the core–sheath interface, which led to different crystallization behavior of PEG1000 at the interface and in the PCM matrix. The thermal stability of PEG was unaffected by the PP encasing; only the decomposition temperature, corresponding to 50% weight loss of PEG1000 inside the PP fiber, was a little higher compared to that of pure PEG1000. Cycling heating and cooling tests proved the reversibility of latent heat release and storage properties, and the reliability of the PCM fiber.

Accelerated long-term assessment of thermal and chemical stability of bio-based phase change materials

2016 ◽  
Vol 40 (4) ◽  
pp. 299-310 ◽  
Author(s):  
Jignesh S Patel ◽  
Elizabeth Gao ◽  
Veera M Boddu ◽  
Larry D Stephenson ◽  
Ashok Kumar
Keyword(s):  
Differential Scanning Calorimetry ◽  
Phase Change ◽  
Phase Change Material ◽  
Latent Heat ◽  
Chemical Stability ◽  
Phase Change Materials ◽  
Scanning Calorimetry ◽  
Change Material ◽  
Scanning Electron

Thermal energy storage systems incorporated with phase change materials have potential applications to control energy use by building envelopes. However, it is essential to evaluate long-term performance of the phase change materials and cost-effectiveness prior to full-scale implementation. For this reason, we have used the accelerated long-term approach for studying the thermal performance and chemical stability of a commercially available bio-based phase change material during thermal cycling over a simulated period of 20 years. The phase change material was subjected to accelerate thermal aging under controlled environmental conditions. Small samples of the phase change material were periodically removed to measure its latent heat, thermal decomposition, and chemical stability using various analytical methods such as differential scanning calorimetry, thermogravimetry analysis, and infrared spectroscopy. The topographic changes in the phase change material due to the aging process were observed using scanning electron microscopy. The differential scanning calorimetry data indicate a significant reduction of 12% in the latent heat during heating and cooling cycles during the initial 6.2 years remain nearly constant thereafter. The thermogravimetry analysis results showed that the phase change material has excellent thermal stability within the working temperature range and also shows long-term decomposition temperature stability. The Fourier transform infrared spectra of the phase change material indicate absorption of moisture but the phase change material was chemically stable over the duration of accelerated aging cycles. After several aging cycles, the baseline surface morphology appeared to be changed from uniform mix of phase change material with microstructures to segregated microstructures as evidenced by the observation of the scanning electron micrographs.

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