A Novel Composite Phase-Change Material: CaCl2·6H2O+MgCl2·6H2O+NH4Cl

2018 ◽  
Vol 71 (6) ◽  
pp. 416
Author(s):  
Ouyang Dong ◽  
Zhihong Zhang ◽  
Zhenhai Fu ◽  
Xiang Li
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Latent Heat ◽  
Carboxymethyl Cellulose ◽  
Nucleating Agent ◽  
Phase Change Temperature ◽  
Change Temperature ◽  
Composite Phase Change Material ◽  
Change Material ◽  
New Phase

A new phase-change material (PCM) CaCl2·6H2O + MgCl2·6H2O + NH4Cl was investigated in this paper. MgCl2·6H2O and NH4Cl were mixed with CaCl2·6H2O to obtain CaCl2·6H2O as a eutectic hydrate salt. The results show that the eutectic composition of the PCM is as follows: 90 wt- % CaCl2·6H2O, 6.25 wt- % MgCl2·6H2O and 3.75 wt- % NH4Cl; the undercooling degree is less than 1.5°C when the nucleating agent is 2 wt- % SrCl2·6H2O or 1.5 wt- % Ba(OH)2·8H2O. The phase-change temperature and latent heat are respectively 25.3°C and 144.3 J g−1 when the composition is 90 wt- % CaCl2·6H2O, 6.25 wt- % MgCl2·6H2O, 3.75 wt- %, NH4Cl, with 2 wt- % SrCl2·6H2O as nucleating agent, and 2 wt- % carboxymethyl cellulose as thickener. In addition, when the composition is changed to 90 wt- % CaCl2·6H2O, 6.25 wt- % MgCl2·6H2O, 3.75 wt- % NH4Cl, 1.5 wt- % Ba(OH)2·8H2O and 2 wt- % carboxymethyl cellulose, the phase change temperature and latent heat are 25.2°C and 139.3 J g−1, respectively.

Preparation and Research of Phase Change Material Based EVA / Binary Fatty Acids Composite

2011 ◽  
Vol 311-313 ◽  
pp. 2048-2051
Author(s):  
Jing Guo ◽  
Jing Nan Fan ◽  
Heng Xue Xiang
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Phase Change ◽  
Phase Change Material ◽  
Latent Heat ◽  
Fatty Acid Content ◽  
Intermolecular Forces ◽  
Phase Change Temperature ◽  
Change Temperature ◽  
Change Material

In this study, melting method is adopted for the preparation of phase change material based EVA /binary fatty acids composite. Phase change temperature and latent heat of the binary fatty acids and EVA /binary fatty acids composite are characterized using Differential Scanning Calorimetry (DSC). The structure and thermal insulation properties of the binary fatty acids and EVA /binary fatty acids composite are investigated using Fourier transformation infrared spectroscope (FTIR) and temperature-recording instrument. The DSC results show that Phase change temperature and latent heat of the binary fatty acids are less than that of pure Stearic Acid and Lauric Acid, The latent heat of EVA /binary fatty acids composite are increase with the increasing of the binary fatty acid content. Cooling curves show that the binary fatty acid and EVA /binary fatty acids composite have good insulation properties. The FTIR results show that EVA and binary fatty acid are combined by intermolecular forces.

Setting for the Application of Phase Change Paraffin in Block Masonry

2013 ◽  
Vol 448-453 ◽  
pp. 1308-1311
Author(s):  
Feng Jiang ◽  
Yong Le Hou ◽  
Yong Lin Hu ◽  
Wei Dong Zhu ◽  
Qing Hua Wang
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Latent Heat ◽  
Phase Change Materials ◽  
Liquid Paraffin ◽  
Change Temperature ◽  
Composite Phase Change Material ◽  
Heat Preservation ◽  
Solid Liquid ◽  
Change Material

This paper studies the insulation properties of masonry filling paraffin composite phase change material. With high density polyethylene (HDPE) as wrapping materials and solid-liquid mixing paraffin as phase change materials, solid-liquid mixed paraffin phase change material with different amount of admixture is prepared, and the problem of flowing after paraffin phase change is then solved. The phase change temperature and the phase change latent heat of composite phase change material with different amount of admixture are tested. The results showed that the composite material with 30% of 52 # solid paraffin, 70% of liquid paraffin, 70% of HDPE coating performs best as to the phase transition temperature and latent heat. On this basis, This paper studies the composite phase change wall with phase change materials 0%, 33%, 66% and100%. Results show that the composite phase change material wall’s heat preservation performance has significantly improved. the temperature fluctuation range of internal and external wall surface is 4.2 °C lower than unfilled wall.

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.

Experimental Study on Composite Phase Change Thermal Insulation Mortar

2020 ◽  
Vol 852 ◽  
pp. 160-169
Author(s):  
Ying Zhou ◽  
Shuang Xi Wang
Keyword(s):  
Phase Change ◽  
Latent Heat ◽  
Thermal Insulation ◽  
Expanded Perlite ◽  
Phase Change Temperature ◽  
Solar Greenhouse ◽  
Change Temperature ◽  
Composite Phase Change Material ◽  
Change Material ◽  
The Ideal

The insulation wall provides suitable heat for winter production of solar greenhouse. A thermal insulation mortar containing paraffin/expanded perlite composite phase change material based on desulfurized gypsum was studied as an inner insulation mortar to improve heat preservation and storage/exothermic capacities in solar greenhouse walls. Results showed that the ideal mass ratio of paraffin and expanded perlite was 60:40. The phase change temperature of the paraffin/expanded perlite composite particles was 25.3 °C, and the latent heat was 122.3 kJ/kg. The ideal mass ratio of this composite phase change material and desulfurized gypsum was 1:3. The ideal mixing amounts of dispersible polymer powder, redispersible latex powder, citric acid, hydroxypropyl methyl cellulose ether, and polypropylene fiber were 2%, 0.15%, 0.5%, and 0.5% of desulfurized gypsum content, respectively. The prepared composite phase change thermal insulation mortar had a dry density of 363 kg/m3, a compressive strength of 0.73 MPa, a softening coefficient of 0.65, a coefficient of thermal conductivity of 0.076 W/m·K-1, a heat capacity of 1.35×103 J/kg·°C-1, a heat storage coefficient of 11.65 W/m2·K-1, a phase change temperature of 25.6 °C, and a phase change latent heat of 89.8 kJ/kg. The phase change temperature and the phase change latent heat were suitable for solar greenhouse production.

scholarly journals Energy Performance of an Encapsulated Phase Change Material PV/T System

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3929 ◽  
Author(s):  
Yang ◽  
Zhou ◽  
Yuan
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Energy Performance ◽  
Phase Change Temperature ◽  
System A ◽  
Change Temperature ◽  
Latent Heat Capacity ◽  
Encapsulated Phase Change Material ◽  
Change Material ◽  
T System

This study aimed to investigate the performance of a novel encapsulated phase change material (PCM) photovoltaic/thermal (PV/T) system. A PCM, which has a high latent heat capacity, can absorb energy from a PV cell and reduce the operating temperature, improving both the electrical and thermal efficiencies of the panel. In this study, a computer model based on a PCM PV/T panel is developed, and its accuracy is verified using experimental data. The effect of the phase change temperature on the performance of the panel was analyzed by numerical simulation. When the phase change temperature was 30.1 °C, the system exhibited a maximum electrical efficiency of 8.2% and a thermal efficiency of 71.8%. When the phase change temperature was 20.24 °C, the system had a maximum exergy efficiency of 33.7%. In general, the temperature of the PCM integrated into the PV/T system should not be too high.

scholarly journals Latent Heat Storage and Thermal Efficacy of Carboxymethyl Cellulose Carbon Foams Containing Ag, Al, Carbon Nanotubes, and Graphene in a Phase Change Material

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 158 ◽  
Author(s):  
Hong Kim ◽  
Yong-Sun Kim ◽  
Lee Kwac ◽  
Hee Shin ◽  
Sang Lee ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Phase Change ◽  
Latent Heat ◽  
Carbon Foam ◽  
Phase Change Temperature ◽  
Carbon Foams ◽  
Change Temperature ◽  
Latent Heat Loss ◽  
Change Material

Carbon foam was prepared from carboxymethyl cellulose (CMC) and Ag, Al and carbon nanotubes (CNTs), and graphene was added to the foam individually, to investigate the enhancement effects on the thermal conductivity. In addition, we used the vacuum method to impregnate erythritol of the phase change material (PCM) into the carbon foam samples to maximize the latent heat and minimize the latent heat loss during thermal cycling. Carbon foams containing Ag (CF-Ag), Al (CF-Al), CNT (CF-CNT) and graphene (CF-G) showed higher thermal conductivity than the carbon foam without any nano thermal conducting materials (CF). From the variations in temperature with time, erythritol added to CF, CF-Ag, CF-Al, CF-CNT, and CF-G was observed to decrease the time required to reach the phase change temperature when compared with pure erythritol. Among them, erythritol added to CF-G had the fastest phase change temperature, and this was related to the fact that this material had the highest thermal conductivity of the carbon foams used in this study. According to differential scanning calorimetry (DSC) analyses, the materials in which erythritol was added (CF, CF-Ag, CF-Al, CF-CNT, and CF-G) showed lower latent heat values than pure erythritol, as a result of their supplementation with carbon foam. However, the latent heat loss of these supplemented materials was less than that of pure erythritol during thermal cycling tests because of capillary and surface tension forces.

Conventional Refrigeration Systems Using Phase Change Material: A Review

2016 ◽  
Vol 24 (03) ◽  
pp. 1630007 ◽  
Author(s):  
Md. Imran H. Khan
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Refrigeration System ◽  
Frozen Food ◽  
Phase Change Temperature ◽  
Experimental Approaches ◽  
Change Temperature ◽  
Selection For ◽  
Change Material

A phase change material (PCM) is a substance that can store or release significant amounts of heat energy by changing its phase from liquid to vapor or vice versa. It has already been proven that incorporation of PCM with refrigeration systems improves the energy efficiency as well as the quality of the frozen food. However, the attachment of PCM system with the refrigeration system is a challenging task. Different aspects such as PCM thickness, quantity of PCM, PCM phase change temperature selection for optimizing energy consumptions of refrigeration systems are the main concerns of today’s researches. However, there is no specific study to concern these aspects of PCM in refrigeration systems. Therefore, in this paper, a comprehensive literature review has been made. The effects of different process parameters such as the thickness of PCM, phase change temperature of PCM and position of PCM have been discussed. This paper also presents a review of the modeling approaches as well as experimental approaches for the application of PCM in a refrigeration system. Moreover, the present status of the refrigeration system with PCM has been presented. Finally, the limitations of incorporation of PCM in a refrigeration system have been also discussed.

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