KNO3/NaNO3 – Graphite materials for thermal energy storage at high temperature: Part I. – Elaboration methods and thermal properties

Acem, Zoubir; Lopez, Jérôme; Barrio, Elena Palomo del

doi:10.1016/j.applthermaleng.2010.03.013

Cited by 141 publications

(43 citation statements)

References 23 publications

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“…Two different compression routes have been investigated: uni-axial cold-compression and isostatic compression (see ref. [9] for details). We remind that expanded natural graphite (ENG) is a well-known material produced from exfoliation of natural graphite particles (i.e.…”

Section: Graphite/salt Compositesmentioning

confidence: 97%

“…As explained in ref. [9], the samples have been elaborated so that the total porosity is about 20e25% in all the cases. Samples apparent density ranges from 1500 kg/m 3 to 1800 kg/m 3 .…”

Section: Graphite/salt Compositesmentioning

confidence: 99%

“…Two different compression routes have been investigated: uni-axial compression and isostatic compression. The first part of the paper [9] has been devoted to the detailed description of the resulting composites as well as to the analysis of their thermal properties. It has been shown that both uni-axial and isostatic cold-compression are simple and equally efficient techniques for improving the salt thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

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KNO3/NaNO3 – Graphite materials for thermal energy storage at high temperature: Part II. – Phase transition properties

Lopez

Acem

Barrio

2010

Applied Thermal Engineering

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Section: Graphite/salt Compositesmentioning

confidence: 97%

“…As explained in ref. [9], the samples have been elaborated so that the total porosity is about 20e25% in all the cases. Samples apparent density ranges from 1500 kg/m 3 to 1800 kg/m 3 .…”

Section: Graphite/salt Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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KNO3/NaNO3 – Graphite materials for thermal energy storage at high temperature: Part II. – Phase transition properties

Lopez

Acem

Barrio

2010

Applied Thermal Engineering

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“…In their work, Acem et al proposed a new elaboration method (cold-compression) as alternative to foams infiltration [13]. It consists of cold-compression of a physical mixing of expanded natural graphite particles and salt powder.…”

Section: Thermal Conductivity Enhancement Of Pcmsmentioning

confidence: 99%

Advances in phase change materials for thermal solar power plants Quality

Fernández¹,

Estébanez²,

Pérez³

et al. 2024

RE&PQJ

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Abstract. Thermal solar energy offers a huge opportunity to reduce fuel dependency and environmental impact created by fossil fuel consumption. One of the main disadvantages of this renewable energy is its intermittence which decreases thermal solar power plants performance. In order to reduce cost electricity is necessary to create thermal solar plants which include thermal storage. There are different options of thermal storage: sensible, latent and chemical heat. It has been demonstrated that latent heat could store large amount of energy per unit mass. Moreover, latent heat storage could store fusion heat at a constant temperature which is the phase transition temperature of the phase change materials (PCM). However, these materials have a critical limitation that needs to be resolved in order to reduce operation cost of solar plants. This limitation is their low heat conductivity. This paper gathers the main solutions that are being analyzed in order to increase the possibilities to use PCMs in a high temperature thermal storage that is essential to develop optimum thermal solar power plants.

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“…Recent measurements of the electrical conductivity of the solidified KNO 3 -NaNO 3 50: 50 mole% composition and of the melting enthalpy have suggested that the solid consists of alternating areas of sodium nitrate-rich and potassium nitrate-rich composition [12]. Also, a detailed calorimetric study of the NaNO 3 /KNO 3 phase behaviour as a function of cation composition was presented [13].…”

Section: Introductionmentioning

confidence: 99%

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

ElSaeedy¹,

Shahrani²,

El-Rahman³

et al. 2016

IJEPE

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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 (NaNO 3 ) and 40 wt% potassium nitrate (KNO 3 ). Thermal energy storage materials are important for the technology that is applied to reduce cost solar thermal power generation. The NaNO 3 -KNO 3 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 0.6 K 0.4 )NO 3 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 (NO 3 -) during the phase conversion for the eutectic (Na 0.6 K 0.4 )NO 3 system.

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KNO3/NaNO3 – Graphite materials for thermal energy storage at high temperature: Part I. – Elaboration methods and thermal properties

Cited by 141 publications

References 23 publications

KNO3/NaNO3 – Graphite materials for thermal energy storage at high temperature: Part II. – Phase transition properties

KNO3/NaNO3 – Graphite materials for thermal energy storage at high temperature: Part II. – Phase transition properties

Advances in phase change materials for thermal solar power plants Quality

Thermal Properties of (Na<sub>0.6</sub>K<sub>0.4</sub>)NO<sub>3</sub> Thermal Storage System in the Solid-Solid Phase

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KNO3/NaNO3 – Graphite materials for thermal energy storage at high temperature: Part I. – Elaboration methods and thermal properties

Cited by 141 publications

References 23 publications

KNO3/NaNO3 – Graphite materials for thermal energy storage at high temperature: Part II. – Phase transition properties

KNO3/NaNO3 – Graphite materials for thermal energy storage at high temperature: Part II. – Phase transition properties

Advances in phase change materials for thermal solar power plants Quality

Thermal Properties of (Na&lt;sub&gt;0.6&lt;/sub&gt;K&lt;sub&gt;0.4&lt;/sub&gt;)NO&lt;sub&gt;3&lt;/sub&gt; Thermal Storage System in the Solid-Solid Phase

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Thermal Properties of (Na<sub>0.6</sub>K<sub>0.4</sub>)NO<sub>3</sub> Thermal Storage System in the Solid-Solid Phase