Energy Storage in the Emerging Era of Smart Grids Part 5 docx

6.3.3 Analysis of experimental data for voltage stored and energy efficiency 7. Discussion and conclusion [...]... for 60 min and 120 min respectively It is found clearly that the microcapsules are not spherical in shape because of absorbing water And after 150 min, the polymer shell peeled off from the core 118 Energy Storage in the Emerging Era of Smart Grids particles as shown in Fig 5( c) The peeled shells are in spreading state and the core material has been separated without covering We show particular interest... the internal stress generated by the expansion or shrinking of the microPCMs is the main factor leading to the interface morphology changes and damaged of composites A series of PU-shell microPCMs containing n-octadecane is successfully prepared with particle size distribution properly controlled by the emulsion-stirring rate at 136 Energy Storage in the Emerging Era of Smart Grids around 4000 r·min-1... in this study to lead the microPCMs in composites phase change The temperature change was in the range of 15- 50 ºC, which could suffice the phase change of dodecanol As the epoxy had the heat-resistance ability, this maximal temperature of this simulant process was higher than the phase change temperature of dodecanol At the top temperature of 50 ºC, the composites were retaining 10 min to ensure the. .. structures may spoil the thin shells of microcapsule (broken or ruptured), the encapsulated PCM will lose the shells protection [20] Hence, the mechanical properties of composites will decrease following with the internal cracks or microcapsules rupture [21] 124 Energy Storage in the Emerging Era of Smart Grids These entire interface changes certainly influence and shorten the service-life of these microPCMs/polymer... Contrastively, both kinds of OSC microcapsules containing n-octadecane lost weight rapidly at the temperature of 100 ºC The lost weight in the beginning may be some water and other molecule ingredients And then the weight decreased sharply from 160 to 350 ºC because of the cracking of shells The weight-loss speed of microcapsules was distinctly less than that of pure n-octadecane Though it indicates that the OSC... forming the shell through polymerization, such as using MF and UF resins, which causes environmental and health problems Generally speaking, it is hard to find an effective 132 Energy Storage in the Emerging Era of Smart Grids means to eliminate formaldehyde that is dissociative and can be continuously releasing from the products In this regard, PU is the promising polymer material in the field of microPCMs... global shape with a diameter of about 5 10 μm and (c) a typical cross-sectional morphology of shells 134 Energy Storage in the Emerging Era of Smart Grids In order to achieve the pure PU-shell material avoiding the influence of core material, the piled PU-shell microcapsules were blended in paraffin After the blend was dried in room temperature, it was carefully cut to obtain the cross-section by an ultramicrotome... fabricate the microPCMs The microPCMs containing dodecanol have the irregular spherical shapes and their average diameter can be controlled by regulating the stirring rates The melting temperatures of these microPCMs were not greatly larger than the phase change temperature of pure dodecanol With the increasing of stirring rates, the average diameters of microPCMs are sharply decreased Ca and Ee values of. .. than that of 1 5 μm And their penetrability with mass ratio of 1:1 (core:shell) is lower than that of 3:1 and 5: 1 under the same core material emulsion speed 120 Energy Storage in the Emerging Era of Smart Grids [12] Considering the above results, only one kind of microPCMs fabricated with mass ratio of 1:1 and diameter of 5 μm were selected in this study to simplify the relationship between the fabrication... we firstly investigated the average diameter, Ca and Ee values of microPCMs fabricated by different Ct with the same string rate and the amount of SAM The results show that the average diameter, Ca and Ee values have increased with the increasing of Ct The average diameter is in the range of 1 55 ±0 84 to 1 99±1 10 μm, which is not greatly affected by Ct Comparatively, the average diameter of microPCMs, . banding of microPCMs and the Energy Storage in the Emerging Era of Smart Grids 112 polymer matrix. The interface morphologies were investigated systemically to understand the effects of. Storage in the Emerging Era of Smart Grids 118 particles as shown in Fig. 5( c). The peeled shells are in spreading state and the core material has been separated without covering. We show particular. following with the internal cracks or microcapsules rupture [21]. Energy Storage in the Emerging Era of Smart Grids 124 These entire interface changes certainly influence and shorten the service-life