Growth of the Phase Change Enthalpy Induced by the Crystal Transformation of an Inorganic–Organic Eutectic Mixture of Magnesium Nitrate Hexahydrate–Glutaric Acid

2020 ◽  
Vol 59 (14) ◽  
pp. 6751-6760 ◽  
Author(s):  
Suimin Li ◽  
Shao Lin ◽  
Ziye Ling ◽  
Xiaoming Fang ◽  
Zhengguo Zhang
Keyword(s):  
Phase Change ◽  
Glutaric Acid ◽  
Eutectic Mixture ◽  
Magnesium Nitrate ◽  
Nitrate Hexahydrate ◽  
Crystal Transformation ◽  
Magnesium Nitrate Hexahydrate ◽  
Organic Eutectic

scholarly journals Corrosive effects of nitrate-containing phase change materials used with copper

2016 ◽  
Vol 9 (2) ◽  
pp. 75-83 ◽  
Author(s):  
Vladimír Danielik ◽  
Peter Šoška ◽  
Katarína Felgerová
Keyword(s):  
Corrosion Rate ◽  
Phase Change ◽  
Phase Change Materials ◽  
Corrosion Behaviour ◽  
Calcium Nitrate ◽  
Magnesium Nitrate ◽  
Nitrate Hexahydrate ◽  
Calcium Nitrate Tetrahydrate ◽  
Magnesium Nitrate Hexahydrate ◽  
Nitrate Tetrahydrate

Abstract The paper presents the results of a study on the corrosion behaviour of copper (EN CW004A) in five possible phase change materials (PCMs): magnesium nitrate hexahydrate pure and with an addition of Mg(OH)2 (0.5 wt. %) or Sr(OH)2 (0.5 wt. %) at 90 °C, calcium nitrate tetrahydrate at 50 °C and a mixture of magnesium nitrate hexahydrate and calcium nitrate tetrahydrate (1:1 mass ratio) at 72 °C. The corrosion rate of copper samples is low except for the use of Mg(NO3)2 · 6H2O with/without an addition of Mg(OH)2. The lowest corrosion rate was observed for the mixture Mg(NO3)2 · 6H2O—Ca(NO3)2 · 4H2O (1:1), and it was ca six times lower than that of pure magnesium nitrate hexahydrate.

scholarly journals Experimental Research of the Heat Storage Performance of a Magnesium Nitrate Hexahydrate-Based Phase Change Material for Building Heating

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7108
Author(s):  
Yang Li ◽  
Caixia Wang ◽  
Jun Zong ◽  
Jien Ma ◽  
Youtong Fang
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Heat Storage ◽  
Thermal Storage ◽  
Magnesium Nitrate ◽  
Storage Device ◽  
Outer Side ◽  
Nitrate Hexahydrate ◽  
Magnesium Nitrate Hexahydrate ◽  
Change Material

Phase change heat storage material is a preferred material in solar building heating or off-peak electric-heat storage heating technology and is the research focus. A compact phase change thermal storage device has been designed and experimentally studied for improving heating system load in this work. A new type, magnesium nitrate hexahydrate-based phase change material has been studied to improve the cooling degree and crystallization difficulty. The focus of this study is on the heat charging and discharging characteristics of this new phase change material. The heat storage device has two groups of coils, the inner side which carries water and the outer side which is the phase change material. A testing system was built up to value the thermal cycling performance of the heat storage device. The measurement data include phase change material temperature field, water inlet and water outlet mean temperature, heat charging and heat discharging depth, and flow rates over the operating period. The results show the phase change material has a quick response with the operating temperature range of 20–99 °C. Its latent heat is 151.3 J/g at 91.8 °C. The heat storage density of this phase change material is about 420 MJ/m3. The thermal performance degradation is about 1.8% after 800 operation cycles. The phase change thermal storage device shows flexibility and a great potential to improve the capacity and economy of heating systems.

scholarly journals Applications of a simultaneous differential scanning calorimetry–thermomicroscopy system

2021 ◽  
Author(s):  
Gage P. Ashton ◽  
Edward L. Charsley ◽  
Lindsay P. Harding ◽  
Gareth M. B. Parkes
Keyword(s):  
Silver Iodide ◽  
Magnesium Nitrate ◽  
Optical Data ◽  
Nitrate Hexahydrate ◽  
Scanning Calorimetry ◽  
Rubidium Nitrate ◽  
Complex Processes ◽  
Magnesium Nitrate Hexahydrate ◽  
Intensity Measurements ◽  
Reversible Transitions

AbstractA simultaneous DSC–thermomicroscopy system (DSC450 Linkam Scientific) was applied to the study of phase transitions in rubidium nitrate and silver iodide, the oxidation of polyethylene, the thermal degradation of polylactic acid and magnesium nitrate hexahydrate, and the reversible transitions in thermochromic inks. The results demonstrated the benefits of obtaining simultaneous optical data, both images and light intensity measurements, with DSC, particularly in the interpretation of complex processes and the detection of events with small changes in enthalpy.

Hydrothermal Synthesis of MgBO2(OH) Nanomaterials

2011 ◽  
Vol 268-270 ◽  
pp. 195-199
Author(s):  
Guo Sheng Wang ◽  
Kang Jun Wang ◽  
Jia Hou ◽  
Hong Yan Sun ◽  
Ying Ming Wang
Keyword(s):  
Hydrothermal Synthesis ◽  
Crystal Morphology ◽  
Magnesium Nitrate ◽  
Nitrate Hexahydrate ◽  
Temperature Reaction ◽  
Hydrothermal Route ◽  
Magnesium Borate ◽  
Reaction Condition ◽  
Magnesium Nitrate Hexahydrate ◽  
Composition Structure

Magnesium borate hydroxide (MgBO2(OH) ) were synthesized using magnesium nitrate hexahydrate(MgNO3.6H2O) and borax decahydrate(Na2B4O7.10H2O) by hydrothermal route. Effect of reaction temperature , reaction time and water's volume on the composition , structure , and crystal morphology of the products were investigated, and the products were characterized by XRD and SEM. The results indicated that all of the products were szaibelyite with the reaction condition investigated, and crystal morphology could be tailored via varying the reaction condition.

Densities of nitrate hydrates used as phase change materials

2017 ◽  
Vol 10 (2) ◽  
pp. 79-83
Author(s):  
Vladimír Danielik ◽  
Dominika Szendreiová
Keyword(s):  
Phase Change Materials ◽  
Liquid Mixtures ◽  
Liquid System ◽  
Zinc Nitrate ◽  
Magnesium Nitrate ◽  
Zinc Nitrate Hexahydrate ◽  
Nitrate Hexahydrate ◽  
Temperature Dependency ◽  
Magnesium Nitrate Hexahydrate ◽  
Different Temperatures

AbstractTemperature dependency of densities of the liquid system magnesium nitrate hexahydrate - zinc nitrate hexahydrate was measured. Densities of liquid mixtures were experimentally measured at different temperatures by a method using submersible corpuscle. Based on the obtained data, temperature dependence on the density was obtained. A model describing the density in the whole concentration range very well was created.

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