Thermal Properties of (Na0.6K0.4)NO3 Thermal Storage System in the Solid-Solid Phase

Halima Ibrahim ElSaeedy; Maryam Ayidh Saad Al Shahrani; Karam Fathy Abd El-Rahman; Sayed Taha Mohamed Hassan

doi:doi:10.11648/j.ijepe.20160502.12

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Thermal Properties of (Na_0.6K_0.4)NO₃ Thermal Storage System in the Solid-Solid Phase

Halima Ibrahim ElSaeedy, Maryam Ayidh Saad Al Shahrani, Karam Fathy Abd El-Rahman, Sayed Taha Mohamed Hassan

Published in International Journal of Energy and Power Engineering (Volume 5, Issue 2)

Received: 22 February 2016 Accepted: 6 March 2016 Published: 29 March 2016

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Abstract

The thermal behaviour for the DTA, DSC and TGA measurements have been carried on the solid phase transformation for the binary eutectic mixture of 60 wt% sodium nitrate (NaNO₃) and 40 wt% potassium nitrate (KNO₃). Thermal energy storage materials are important for the technology that is applied to reduce cost solar thermal power generation. The NaNO₃-KNO₃ system is a binary inorganic salt system and it is one of the most promising thermal storage materials. The methods are based on the principle that a change in the physical state of a material is accompanied by the liberation or absorption of heat. The various techniques of thermal analysis are designed for the determination of the enthalpy accompanying the changes in the physical properties of the material. The thermal measurements showed a reversible phase transition at ~114°C during heating process and at ~108°C during cooling process. It has been shown also the presence of thermal hysteresis during this transformation with a magnitude of the hysteresis temperature ~8°C. The thermogravimetery analysis (TGA) indicated that the eutectic system (Na_0.6K_0.4)NO₃ is thermally stable up to the melting point at ≅225°C. This means that the sample under study is structurally stable. DTA measurements were also carried out for the sample at different heating rates of (2, 5, 10, 15 and 20°C/min). Some thermal parameters such as the transition point, enthalpy and the activation energy for the transformation process were estimated at each heating rate. It has been also shown that these parameters are affected by the heating rate. The noticeable effect of heating rate on the thermal parameters means that the heating rate is a main factor to change the thermal interaction potential of the Na and K atoms around the nitrate group (NO₃^-) during the phase conversion for the eutectic (Na_0.6K_0.4)NO₃ system.

Published in	International Journal of Energy and Power Engineering (Volume 5, Issue 2)
DOI	10.11648/j.ijepe.20160502.12
Page(s)	34-38
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2016. Published by Science Publishing Group

Keywords

Phase Change Material, Thermal Storage, Calorimetry

References

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Halima Ibrahim ElSaeedy, Maryam Ayidh Saad Al Shahrani, Karam Fathy Abd El-Rahman, Sayed Taha Mohamed Hassan. (2016). Thermal Properties of (Na0.6K0.4)NO3 Thermal Storage System in the Solid-Solid Phase. International Journal of Energy and Power Engineering, 5(2), 34-38. https://doi.org/10.11648/j.ijepe.20160502.12

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ACS Style

Halima Ibrahim ElSaeedy; Maryam Ayidh Saad Al Shahrani; Karam Fathy Abd El-Rahman; Sayed Taha Mohamed Hassan. Thermal Properties of (Na0.6K0.4)NO3 Thermal Storage System in the Solid-Solid Phase. Int. J. Energy Power Eng. 2016, 5(2), 34-38. doi: 10.11648/j.ijepe.20160502.12

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AMA Style

Halima Ibrahim ElSaeedy, Maryam Ayidh Saad Al Shahrani, Karam Fathy Abd El-Rahman, Sayed Taha Mohamed Hassan. Thermal Properties of (Na0.6K0.4)NO3 Thermal Storage System in the Solid-Solid Phase. Int J Energy Power Eng. 2016;5(2):34-38. doi: 10.11648/j.ijepe.20160502.12

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@article{10.11648/j.ijepe.20160502.12,
  author = {Halima Ibrahim ElSaeedy and Maryam Ayidh Saad Al Shahrani and Karam Fathy Abd El-Rahman and Sayed Taha Mohamed Hassan},
  title = {Thermal Properties of (Na0.6K0.4)NO3 Thermal Storage System in the Solid-Solid Phase},
  journal = {International Journal of Energy and Power Engineering},
  volume = {5},
  number = {2},
  pages = {34-38},
  doi = {10.11648/j.ijepe.20160502.12},
  url = {https://doi.org/10.11648/j.ijepe.20160502.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijepe.20160502.12},
  abstract = {The thermal behaviour for the DTA, DSC and TGA measurements have been carried on the solid phase transformation for the binary eutectic mixture of 60 wt% sodium nitrate (NaNO3) and 40 wt% potassium nitrate (KNO3). Thermal energy storage materials are important for the technology that is applied to reduce cost solar thermal power generation. The NaNO3-KNO3 system is a binary inorganic salt system and it is one of the most promising thermal storage materials. The methods are based on the principle that a change in the physical state of a material is accompanied by the liberation or absorption of heat. The various techniques of thermal analysis are designed for the determination of the enthalpy accompanying the changes in the physical properties of the material. The thermal measurements showed a reversible phase transition at ~114°C during heating process and at ~108°C during cooling process. It has been shown also the presence of thermal hysteresis during this transformation with a magnitude of the hysteresis temperature ~8°C. The thermogravimetery analysis (TGA) indicated that the eutectic system (Na0.6K0.4)NO3 is thermally stable up to the melting point at ≅225°C. This means that the sample under study is structurally stable. DTA measurements were also carried out for the sample at different heating rates of (2, 5, 10, 15 and 20°C/min). Some thermal parameters such as the transition point, enthalpy and the activation energy for the transformation process were estimated at each heating rate. It has been also shown that these parameters are affected by the heating rate. The noticeable effect of heating rate on the thermal parameters means that the heating rate is a main factor to change the thermal interaction potential of the Na and K atoms around the nitrate group (NO3-) during the phase conversion for the eutectic (Na0.6K0.4)NO3 system.},
 year = {2016}
}

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TY - JOUR
T1 - Thermal Properties of (Na0.6K0.4)NO3 Thermal Storage System in the Solid-Solid Phase
AU - Halima Ibrahim ElSaeedy
AU - Maryam Ayidh Saad Al Shahrani
AU - Karam Fathy Abd El-Rahman
AU - Sayed Taha Mohamed Hassan
Y1 - 2016/03/29
PY - 2016
N1 - https://doi.org/10.11648/j.ijepe.20160502.12
DO - 10.11648/j.ijepe.20160502.12
T2 - International Journal of Energy and Power Engineering
JF - International Journal of Energy and Power Engineering
JO - International Journal of Energy and Power Engineering
SP - 34
EP - 38
PB - Science Publishing Group
SN - 2326-960X
UR - https://doi.org/10.11648/j.ijepe.20160502.12
AB - The thermal behaviour for the DTA, DSC and TGA measurements have been carried on the solid phase transformation for the binary eutectic mixture of 60 wt% sodium nitrate (NaNO3) and 40 wt% potassium nitrate (KNO3). Thermal energy storage materials are important for the technology that is applied to reduce cost solar thermal power generation. The NaNO3-KNO3 system is a binary inorganic salt system and it is one of the most promising thermal storage materials. The methods are based on the principle that a change in the physical state of a material is accompanied by the liberation or absorption of heat. The various techniques of thermal analysis are designed for the determination of the enthalpy accompanying the changes in the physical properties of the material. The thermal measurements showed a reversible phase transition at ~114°C during heating process and at ~108°C during cooling process. It has been shown also the presence of thermal hysteresis during this transformation with a magnitude of the hysteresis temperature ~8°C. The thermogravimetery analysis (TGA) indicated that the eutectic system (Na0.6K0.4)NO3 is thermally stable up to the melting point at ≅225°C. This means that the sample under study is structurally stable. DTA measurements were also carried out for the sample at different heating rates of (2, 5, 10, 15 and 20°C/min). Some thermal parameters such as the transition point, enthalpy and the activation energy for the transformation process were estimated at each heating rate. It has been also shown that these parameters are affected by the heating rate. The noticeable effect of heating rate on the thermal parameters means that the heating rate is a main factor to change the thermal interaction potential of the Na and K atoms around the nitrate group (NO3-) during the phase conversion for the eutectic (Na0.6K0.4)NO3 system.
VL - 5
IS - 2
ER -

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Author Information

Halima Ibrahim ElSaeedy

Department of Physics, Faculty of Science for Girls, King Khalid University, Abha, Saudi Arabia
Maryam Ayidh Saad Al Shahrani

Department of Physics, Faculty of Science for Girls, Bisha University, Abha, Saudi Arabia
Karam Fathy Abd El-Rahman

Department of Physics, Faculty of Science for Girls, King Khalid University, Abha, Saudi Arabia
Sayed Taha Mohamed Hassan

Department of Physics, Faculty of Science, King Khalid University, Abha, Saudi Arabia

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APA Style

Halima Ibrahim ElSaeedy, Maryam Ayidh Saad Al Shahrani, Karam Fathy Abd El-Rahman, Sayed Taha Mohamed Hassan. (2016). Thermal Properties of (Na0.6K0.4)NO3 Thermal Storage System in the Solid-Solid Phase. International Journal of Energy and Power Engineering, 5(2), 34-38. https://doi.org/10.11648/j.ijepe.20160502.12

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ACS Style

Halima Ibrahim ElSaeedy; Maryam Ayidh Saad Al Shahrani; Karam Fathy Abd El-Rahman; Sayed Taha Mohamed Hassan. Thermal Properties of (Na0.6K0.4)NO3 Thermal Storage System in the Solid-Solid Phase. Int. J. Energy Power Eng. 2016, 5(2), 34-38. doi: 10.11648/j.ijepe.20160502.12

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AMA Style

Halima Ibrahim ElSaeedy, Maryam Ayidh Saad Al Shahrani, Karam Fathy Abd El-Rahman, Sayed Taha Mohamed Hassan. Thermal Properties of (Na0.6K0.4)NO3 Thermal Storage System in the Solid-Solid Phase. Int J Energy Power Eng. 2016;5(2):34-38. doi: 10.11648/j.ijepe.20160502.12

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@article{10.11648/j.ijepe.20160502.12,
  author = {Halima Ibrahim ElSaeedy and Maryam Ayidh Saad Al Shahrani and Karam Fathy Abd El-Rahman and Sayed Taha Mohamed Hassan},
  title = {Thermal Properties of (Na0.6K0.4)NO3 Thermal Storage System in the Solid-Solid Phase},
  journal = {International Journal of Energy and Power Engineering},
  volume = {5},
  number = {2},
  pages = {34-38},
  doi = {10.11648/j.ijepe.20160502.12},
  url = {https://doi.org/10.11648/j.ijepe.20160502.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijepe.20160502.12},
  abstract = {The thermal behaviour for the DTA, DSC and TGA measurements have been carried on the solid phase transformation for the binary eutectic mixture of 60 wt% sodium nitrate (NaNO3) and 40 wt% potassium nitrate (KNO3). Thermal energy storage materials are important for the technology that is applied to reduce cost solar thermal power generation. The NaNO3-KNO3 system is a binary inorganic salt system and it is one of the most promising thermal storage materials. The methods are based on the principle that a change in the physical state of a material is accompanied by the liberation or absorption of heat. The various techniques of thermal analysis are designed for the determination of the enthalpy accompanying the changes in the physical properties of the material. The thermal measurements showed a reversible phase transition at ~114°C during heating process and at ~108°C during cooling process. It has been shown also the presence of thermal hysteresis during this transformation with a magnitude of the hysteresis temperature ~8°C. The thermogravimetery analysis (TGA) indicated that the eutectic system (Na0.6K0.4)NO3 is thermally stable up to the melting point at ≅225°C. This means that the sample under study is structurally stable. DTA measurements were also carried out for the sample at different heating rates of (2, 5, 10, 15 and 20°C/min). Some thermal parameters such as the transition point, enthalpy and the activation energy for the transformation process were estimated at each heating rate. It has been also shown that these parameters are affected by the heating rate. The noticeable effect of heating rate on the thermal parameters means that the heating rate is a main factor to change the thermal interaction potential of the Na and K atoms around the nitrate group (NO3-) during the phase conversion for the eutectic (Na0.6K0.4)NO3 system.},
 year = {2016}
}

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