Density and heat capacity of molten sodium nitrite-potassium nitrate mixtures

1982 ◽  
Vol 27 (3) ◽  
pp. 288-290 ◽  
Author(s):  
Yasuhiko Iwadate ◽  
Isao Okada ◽  
Kazutaka Kawamura
Keyword(s):  
Heat Capacity ◽  
Sodium Nitrite ◽  
Potassium Nitrate ◽  
Molten Sodium

Molar volumes of the molten sodium nitrate-potassium nitrate-sodium nitrite system

1985 ◽  
Vol 30 (3) ◽  
pp. 274-276 ◽  
Author(s):  
Junichi Mochinaga ◽  
Kazuo Igarashi ◽  
Yasuhiko Iwadate
Keyword(s):  
Sodium Nitrite ◽  
Sodium Nitrate ◽  
Potassium Nitrate ◽  
Molar Volumes ◽  
Molten Sodium

Sound velocity and electrolytic conductivity in the molten sodium nitrite-potassium nitrate system

1985 ◽  
Vol 30 (2) ◽  
pp. 211-214 ◽  
Author(s):  
Shinya Okuyama ◽  
Katsusaburo Toyoda ◽  
Ryuzo Takagi ◽  
Kazutaka Kawamura
Keyword(s):  
Sound Velocity ◽  
Sodium Nitrite ◽  
Potassium Nitrate ◽  
Electrolytic Conductivity ◽  
Molten Sodium ◽  
Nitrate System

scholarly journals Thermal Storage of Nitrate Salts as Phase Change Materials (PCMs)

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7223
Author(s):  
Marco A. Orozco ◽  
Karen Acurio ◽  
Francis Vásquez-Aza ◽  
Javier Martínez-Gómez ◽  
Andres Chico-Proano
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Sodium Nitrite ◽  
Phase Change Materials ◽  
Storage Capacity ◽  
Thermal Storage ◽  
Potassium Nitrate ◽  
Ternary Mixtures ◽  
Scanning Calorimetry ◽  
Nitrate Salts

This study presents the energy storage potential of nitrate salts for specific applications in energy systems that use renewable resources. For this, the thermal, chemical, and morphological characterization of 11 samples of nitrate salts as phase change materials (PCM) was conducted. Specifically, sodium nitrate (NaNO3), sodium nitrite (NaNO2), and potassium nitrate (KNO3) were considered as base materials; and various binary and ternary mixtures were evaluated. For the evaluation of the materials, differential Fourier transform infrared spectroscopy (FTIR), scanning calorimetry (DSC), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) to identify the temperature and enthalpy of phase change, thermal stability, microstructure, and the identification of functional groups were applied. Among the relevant results, sodium nitrite presented the highest phase change enthalpy of 220.7 J/g, and the mixture of 50% NaNO3 and 50% NaNO2 presented an enthalpy of 185.6 J/g with a phase change start and end temperature of 228.4 and 238.6 °C, respectively. This result indicates that sodium nitrite mixtures allow the thermal storage capacity of PCMs to increase. In conclusion, these materials are suitable for medium and high-temperature thermal energy storage systems due to their thermal and chemical stability, and high thermal storage capacity.

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