Scale effects in the latent heat of melting in nanopores

2013 ◽  
Vol 139 (4) ◽  
pp. 044701 ◽  
Author(s):  
J.-H. Shin ◽  
J.-Y. Parlange ◽  
M. R. Deinert
Keyword(s):  
Latent Heat ◽  
Scale Effects ◽  
Latent Heat Of Melting

scholarly journals Enzyme-catalyzed Synthesis of Novel Solid–liquid Phase Change Energy Storage Materials Based on Levulinic Acid and 1,4 butanediol

2021 ◽  
Author(s):  
Siyu Zhai ◽  
Lihe Zhang ◽  
Xi Zhao ◽  
Qian Wang ◽  
Yin Yan ◽  
...  
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Latent Heat ◽  
Levulinic Acid ◽  
Rapid Development ◽  
Synthesis Process ◽  
Energy Storage Materials ◽  
Temperature Phase ◽  
Storage Materials ◽  
Latent Heat Of Melting

Abstract With the rapid development of society, all kinds of non-renewable energy resources are constantly developed and utilized, energy storage is one of the best ways to solve the energy shortage. In this study , levulinic acid (LA) and 1,4 butanediol (BDO) were used to synthesize a novel polyol ester (LABDO) by biological and chemical methods. The biological method exhibited excellent performance in the synthesis process, where 87.5% of LABDO yield under optimal conditions, while the chemical method had more byproducts and higher energy consumption. Finally, the thermal properties of the obtained phase change materials (PCMs) were evaluated. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) showed that the melting temperature of LABDO was 50.51°C, the latent heat of melting was 156.1J/g, and the pyrolysis temperature was 150-160°C. Compared with traditional paraffin wax, the prepared PCMs have suitable phase transition temperature, higher latent heat of melting and better thermal stability. The thermal conductivity can be increased to 0.34W·m-1· k-1 by adding expanded graphite. In summary, LABDO can be used as low temperature phase change energy storage materials.

scholarly journals Thermal characterization of the In–Sn–Zn eutectic alloy

10.30544/456 ◽  
2020 ◽  
Vol 25 (04) ◽  
pp. 325-334
Author(s):  
Dragan Manasijević ◽  
Ljubiša Balanović ◽  
Vladan Ćosović ◽  
Duško Minić ◽  
Milena Premović ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Melting Temperature ◽  
Latent Heat ◽  
Eutectic Alloy ◽  
Metallic Phase ◽  
Flash Method ◽  
Nominal Composition ◽  
Scanning Calorimetry ◽  
Latent Heat Of Melting

Thermal properties, including melting temperature, latent heat of melting, specific heat capacity and thermal conductivity, of a low-melting In–Sn–Zn eutectic alloy were investigated in this work. The In–Sn–Zn eutectic alloy with nominal composition 52.7In-44.9Sn-2.4Zn (at.%) was prepared by the melting of pure metals under an argon atmosphere. The conducted assessment consisted of both theoretical and experimental approaches. Differential scanning calorimetry (DSC) was used for the measurement of melting temperature and latent heat, and the obtained results were compared with the results of thermodynamic calculations. The measured melting temperature and the latent heat of melting for the In–Sn–Zn eutectic alloy are 106.5±0.1 °C and 28.3±0.1 Jg-1, respectively. Thermal diffusivity and thermal conductivity of the In–Sn–Zn eutectic alloy were studied by the xenon-flash method. The determined thermal conductivity of the investigated eutectic alloy at 25 °C is 42.2±3.4 Wm-1K-1. Apart from providing insight into the possibility for application of the investigated alloy as the metallic phase-change material, the obtained values of thermal properties can also be utilized as input parameters for various simulation processes such as casting and soldering.

Preparation and Heat Transfer/Thermal Storage Properties of High-Temperature Molten Nitrate Salts

2015 ◽  
Vol 814 ◽  
pp. 60-64
Author(s):  
Hong Tao Zhang ◽  
You Jing Zhao ◽  
Jing Li Li ◽  
Li Jie Shi ◽  
Min Wang
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Melting Point ◽  
Latent Heat ◽  
Sodium Nitrate ◽  
Molten Salts ◽  
Operating Temperature ◽  
Potassium Nitrate ◽  
Nitrate Salts ◽  
Latent Heat Of Melting

The thermal stability of molten salts, operating temperature range and latent heat of melting for the molten salts at high temperature have been studied in the present investigation. The multi-component molten salts composed of purified potassium nitrate, purified sodium nitrate were prepared by statical mixing method [1]. The stability experiments were carried out at 500 to 600°C, and the experimental result showed that the purified nitrate molten salts performed better high-temperature thermal stability and its optimum operating temperature was increased from 500°C to 550°C. DSC analysis indicated that the purified nitrate molten had a lower melting point and a higher phase change latent heat. The melting point of purified binary nitrate molten salts was sharp decreased to 225.2°C and latent heat of melting for molten salts was also reduced from 78.41J/g to 81.15J/g compared with unpurified nitrate salts. Besides, the change in the concentration of impurities by analyzing in the binary molten salts, and combination of XRD test results can be found that the degree of degradation reduce and improve the thermal efficiency of the storage of binary molten salts by purified sodium nitrate and potassium nitrate.

The Influence of Heating-Cooling Cycles on the Thermal Storage Performances of Al-17 Wt.% Si Alloy

2011 ◽  
Vol 239-242 ◽  
pp. 2248-2251 ◽  
Author(s):  
Feng Li ◽  
Yong Jun Hu ◽  
Ren Yuan Zhang
Keyword(s):  
Differential Scanning Calorimetry ◽  
Grain Size ◽  
Latent Heat ◽  
Scanning Calorimetry ◽  
Primary Si ◽  
Eutectic Si ◽  
Latent Heat Of Melting ◽  
Grain Size And Shape ◽  
Energy Storage Property ◽  
Storage Property

The change of thermal properties of Al-17 wt.% Si alloys in different heating-cooling cycles was studied by differential scanning calorimetry (DSC). The influence of heating-cooling cycles on the latent heat of melting was discussed in the view of microstructure of Al-Si alloy. The results showed the latent heat of as-cast Al–13 wt%Si alloy is 548.6 J/g, which Al-Si alloy possesses good thermal energy storage property. The onset of melting point of Al-Si alloy increases indistinctively and is about 577 °C. When the heating-cooling cycle was 1200 times, the latent heat increased to 526.0 J/g. With heating-cooling times increase, the grain size and shape of the primary Si decrease. The shape of eutectic Si is changed into stripe

Solid–liquid and liquid–solid transitions in metal nanoparticles

2017 ◽  
Vol 19 (8) ◽  
pp. 5994-6005 ◽  
Author(s):  
M. Hou
Keyword(s):  
Activation Energy ◽  
Metal Nanoparticles ◽  
Latent Heat ◽  
Latent Heat Of Melting ◽  
Solid Liquid

At the nanoscale, the activation energy of solidification is found equal to the latent heat of melting.

scholarly journals Energy of plate tectonics calculation and projection

2013 ◽  
Vol 5 (1) ◽  
pp. 135-161
Author(s):  
N. H. Swedan
Keyword(s):  
Climate Change ◽  
Surface Temperature ◽  
Latent Heat ◽  
Temperature Rise ◽  
Plate Tectonics ◽  
Ocean Floor ◽  
Sea Floor ◽  
Midocean Ridges ◽  
Latent Heat Of Melting ◽  
Sea Floor Spreading

Abstract. Mathematics and observations suggest that the energy of the geological activities resulting from plate tectonics is equal to the latent heat of melting, calculated at mantle's pressure, of the new ocean crust created at midocean ridges following sea floor spreading. This energy varies with the temperature of ocean floor, which is correlated with surface temperature. The objective of this manuscript is to calculate the force that drives plate tectonics, estimate the energy released, verify the calculations based on experiments and observations, and project the increase of geological activities with surface temperature rise caused by climate change.

scholarly journals Investigation of latent heat of melting and thermal conductivity of the low-melting Bi-Sn-Zn eutectic alloy

2020 ◽  
Vol 57 (04) ◽  
pp. 267-273
Author(s):  
I. Manasijevic ◽  
Lj. Balanovic ◽  
D. Minic ◽  
M. Gorgievski ◽  
U. Stamenkovic
Keyword(s):  
Thermal Conductivity ◽  
Latent Heat ◽  
Eutectic Alloy ◽  
Latent Heat Of Melting
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