Graphene-Modified Hydrate Salt/UV-Curable Resin Form-Stable Phase Change Materials: Continuously Adjustable Phase Change Temperature and Ultrafast Solar-to-Thermal Conversion

2019 ◽  
Vol 33 (8) ◽  
pp. 7634-7644 ◽  
Author(s):  
Kunyang Yu ◽  
Yushi Liu ◽  
Fuzheng Sun ◽  
Minjie Jia ◽  
Yingzi Yang
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Thermal Conversion ◽  
Stable Phase ◽  
Uv Curable ◽  
Phase Change Temperature ◽  
Change Temperature ◽  
Uv Curable Resin ◽  
Hydrate Salt

Preparation and Thermal Propertites of Polyethylene Glycol/ Silica Hollow Nanospheres Composite as Shape-Stabilized Phase Change Materials

2013 ◽  
Vol 773 ◽  
pp. 534-537 ◽  
Author(s):  
Li Li Feng ◽  
Jing Jing Tong ◽  
Chong Yun Wang
Keyword(s):  
Thermal Properties ◽  
Polyethylene Glycol ◽  
Phase Change ◽  
Porous Structure ◽  
Phase Change Materials ◽  
Hollow Nanospheres ◽  
Lower Phase ◽  
Phase Change Temperature ◽  
Change Temperature ◽  
Change Material

Shape-stabilized phase change material (PCM) composed of polyethylene glycol and silica hollow nanospheres was prepared by a vacuum impregnating method. Thermal properties of the composite PCM were investigated by various techniques. Lower phase change temperature and enthalpy of the composite PCM were observed. It is concluded that the phase change properties of the composite PCM are influenced by the adsorption confinement of the PEG segments from the porous structure of the silica hollow nanospheres.

Graphene oxide modified hydrate salt hydrogels: form-stable phase change materials for smart thermal management

2016 ◽  
Vol 4 (46) ◽  
pp. 18134-18143 ◽  
Author(s):  
Yushi Liu ◽  
Yingzi Yang ◽  
Shuangxin Li
Keyword(s):  
Phase Transition ◽  
Graphene Oxide ◽  
Phase Change ◽  
Thermal Management ◽  
Phase Change Materials ◽  
Stable Phase ◽  
Hydrate Salt

The adjustment of phase transition behaviors based on the special interaction of GO and PAAAM with hydrate salt PCM.

Thermal Stability Experimental Study on Three Types of Organic Binary Phase Change Materials Applied in Thermal Energy Storage System

2018 ◽  
Vol 10 (4) ◽  
Author(s):  
Song Mengjie ◽  
Liao Liyuan ◽  
Niu Fuxin ◽  
Mao Ning ◽  
Liu Shengchun ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Research Work ◽  
Energy Storage Materials ◽  
Phase Change Temperature ◽  
Change Temperature

Phase change materials (PCMs) are widely applied in recent decades due to their good thermal performance in energy systems. Their applications are mainly limited by the phase change temperature and latent heat. Many publications are reported around the characteristic improvement of binary organic PCMs. The thermal stability study on organic binary PCMs used in thermal energy storage applications becomes fundamental and meaningful. In this study, thermal stability of three types of organic binary PCMs was experimentally investigated, which are frequently used in building and industry applications. To qualitatively investigate the stability of composite PCMs, differential scanning calorimetry (DSC), and Fourier-transform infrared spectroscopy (FT-IR) spectra testing of samples were also conducted. Experimental results showed that the selected composite PCMs, capric acid (CA), and myristic acid (MA), had the best thermal performances, with its phase change temperature unchanged and heat of fusion decreased only 8.88 J/g, or 4.55%, after 2000 thermal cycles. Furthermore, quality ratio of required PCMs as the variation of operation duration was analyzed to quantitatively prepare the materials. The PCMs can successfully operate about 3125 times when prepared as 1.20 times of its calculated value by starting fusion heat. Conclusions of this research work can also be used for guiding the selection and preparation of other energy storage materials.

scholarly journals Liquid Crystals as Phase Change Materials for Thermal Stabilization

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Eva Klemenčič ◽  
Mitja Slavinec
Keyword(s):  
Liquid Crystals ◽  
Heat Source ◽  
Electric Field ◽  
Phase Change ◽  
Phase Change Materials ◽  
Thermal Stabilization ◽  
Phase Change Temperature ◽  
Thermotropic Liquid Crystals ◽  
Key Factor ◽  
Change Temperature

Thermal stabilization exploiting phase change materials (PCMs) is studied theoretically and numerically. Using the heat source approach in numerical simulations, we focus on phase change temperature as a key factor in improving thermal stabilization. Our focus is to analyze possible mechanisms to tune the phase change temperature. We use thermotropic liquid crystals (LCs) as PCMs in a demonstrative system. Using the Landau-de Gennes mesoscopic approach, we show that an external electric field or appropriate nanoparticles (NPs) dispersed in LCs can be exploited to manipulate the phase change temperature.

Preparation and Performance Study of Fatty Acid Diatomite Composite Phase Change Materials and Light Weight Phase Change Gypsum Wall Materials

2012 ◽  
Vol 193-194 ◽  
pp. 307-313
Author(s):  
Yi Zhang ◽  
Bin Huang ◽  
Jing Yan Zhang ◽  
Dong Xu Li
Keyword(s):  
Fatty Acid ◽  
Phase Change ◽  
Thermal Performance ◽  
Phase Change Materials ◽  
Performance Test ◽  
Eutectic Mixture ◽  
Cooling Curve ◽  
Performance Study ◽  
Phase Change Temperature ◽  
Change Temperature

Fatty acid phase change materials(PCMs) and composite diatomite PCMs were prepared in this study, the phase change temperature of different mole ratio lauric acid(LA) and capric acid(CA) PCMs were tested by step cooling curve method, thermal physical performance of the prepared PCMs were tested by differential scanning calorimeter (DSC). A new type of lightweight phase change gypsum wallboard incorporated with LA-CA/diatomite composite PCMs was prepared, and the thermal performance of this material was studied. The results showed that the LA and CA could form an eutectic mixture. DSC results indicated that the phase change temperature of the PCMs and composite diatomite PCMs are both 26.7°C, the latent heat of the PCMs are 142.2J/g and 73.5J/g, respectively. Thermal performance test of the gypsum wallboard indicated that the temperature difference of the phase change gypsum wallboard at different moment is lower than the blank gypsum wallboard, which showed a better energy storage function of the phase change gypsum wallboard.

Preparation and Characterization of Diatomite Loaded Composite Phase Change Materials

2013 ◽  
Vol 320 ◽  
pp. 314-319
Author(s):  
Jun Mao ◽  
Shui Lin Zheng ◽  
Yu Zhong Zhang ◽  
Yan Ping Bai ◽  
Yue Liu
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Phase Change Materials ◽  
Physical Adsorption ◽  
Phase Change Temperature ◽  
Composite Phase Change Materials ◽  
Change Temperature ◽  
Composite Phase Change Material ◽  
And Performance ◽  
Change Material

Organic phase change materials like paraffin as phase change material, modified diatomite as carrier, composite phase change material with proper phase change temperature and larger phase change enthalpy is prepared by melt blending. The structure and performance of composite phase material are characterized using SEM, FI-IR and synthesized thermal analyzer DSC. The results show that the phase change temperature of composite phase change material is 30, and phase change enthalpy is 89.54J/g. With every part preserved, phase change particles are distributed in the diatomite/melted paraffin matrix evenly. Stable composite phase change materials are prepared with diatomite as carrier and paraffin as PCM, which are bonded with Vander Waals forces in the form of physical adsorption.

Research on the Thermal Storage Performance of Solid-Solid Phase-Change Material Used in the Wall

2011 ◽  
Vol 347-353 ◽  
pp. 2801-2804 ◽  
Author(s):  
Quan Ying Yan ◽  
Li Li Jin
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Binary Systems ◽  
Phase Change Materials ◽  
Solid Phase ◽  
Thermal Storage ◽  
Phase Change Temperature ◽  
Change Temperature ◽  
Materials Used ◽  
Change Material

Solid-solid phase change material can increase the thermal storage capacity of the wall, decrease the indoor temperature fluctuation and building energy consumption when it was used in the phase change material (PCM) wall. This paper investigated experimentally the phase change temperature and latent heat of polyalcohols binary system with different component, and analyzed the feasibility of phase change wall. The results show that binary systems have suitable phase change temperature and bigger phase change latent. They are ideal phase change materials used in the wall.

Experimental Research on Shape-Stabilized Phase Change Materials Applied in the Phase Change Wall

2013 ◽  
Vol 800 ◽  
pp. 243-246
Author(s):  
Li Hang Yue ◽  
Quan Ying Yan ◽  
Zhen Bang Ruan
Keyword(s):  
Phase Change ◽  
Latent Heat ◽  
Mass Fraction ◽  
Phase Change Materials ◽  
Critical Mass ◽  
Phase Change Temperature ◽  
Change Temperature ◽  
Save Energy ◽  
The Stability ◽  
Change Material

Shape-stabilized phase change materials can store thermal energy and save energy when it is added into the wall. The phase change temperature, latent heat and the stability of shape-stabilized phase change materials with different component were studied experimentally. The critical mass fraction of paraffin required in the materials is given. It is proved that the shape-stabilized phase change material is ideal material used in the phase change wall because it has good stability and uniformity, higher latent heat and suitable phase change temperature.

Analytical Optimization of Key Design Parameters of Phase Change Materials Used in Passive Building Envelopes

2012 ◽  
Vol 608-609 ◽  
pp. 1751-1758
Author(s):  
Rui Cheng ◽  
Xin Wang ◽  
Yin Ping Zhang
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Melting Enthalpy ◽  
Design Parameters ◽  
Phase Change Temperature ◽  
Energy Efficient Buildings ◽  
Change Temperature ◽  
Novel Method ◽  
Materials Used ◽  
Solar House

Phase change materials have been widely used in energy efficient buildings for thermal energy conservation. Determination of the optimal phase change temperature and melting enthalpy is important to achieve the best energy saving performance. This paper presented a novel method to determine the optimal phase change temperature and melting enthalpy in a passive solar house based on analytical analysis. It was showed that the optimal phase change temperatures of PCMs in Copenhagen and Madrid are 23 °C and 22.6 °C. And the optimal melting enthalpy of the given house is 735.4 MJ/m3 for the whole winter. In addition, sensitivity analysis was applied to determine the most influencing fators to the optimal phase change temperature and melting enthalpy. The results showed that the most influencing factors are ACH and dimensionless thermal resistance number. The proposed method can offer guidelines to determine the optimal phase change materials in given buildings.

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