Overview of PCMs for Concentrated Solar Power in the Temperature Range 200 to 350°C

Bauer, Thomas; Laing, Doerte; Tamme, Rainer

doi:10.4028/www.scientific.net/ast.74.272

Cited by 55 publications

(24 citation statements)

References 28 publications

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“…As the PCM storage material has a poor thermal conductivity (see Table 2) [10], it is necessary to enhance the heat transfer in order to meet the necessary power density demands for the specific applications. These demands for power density vary widely depending on the application.…”

Section: Analysis Of New Fin Designs For Pcm Storagementioning

confidence: 99%

Development of high temperature phase-change-material storages

et al. 2013

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Section: Analysis Of New Fin Designs For Pcm Storagementioning

confidence: 99%

Development of high temperature phase-change-material storages

et al. 2013

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“…It is difficult to ensure homogeneous eutectic composition along the whole material, especially for large quantities (>1000 kg) [33]. Along the DSC experimental tests, it was noticed that 70 wt % NaOH/30 wt % LiOH did not show phase change, and this is probably because the mixture resulted is not homogeneous (not a proper eutectic mixture).…”

Section: Thermophysical Characterizationmentioning

confidence: 99%

Phase Change Material Selection for Thermal Energy Storage at High Temperature Range between 210 °C and 270 °C

et al. 2018

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Abstract:The improvement of thermal energy storage systems implemented in solar technologies increases not only their performance but also their dispatchability and competitiveness in the energy market. Latent heat thermal energy storage systems are one of those storing methods. Therefore, the need of finding the best materials for each application becomes an appealing research subject. The main goal of this paper is to find suitable and economically viable materials able to work as phase change material (PCM) within the temperature range of 210-270 • C and endure daily loading and unloading processes in a system with Fresnel collector and an organic Rankine cycle (ORC). Twenty-six materials have been tested and characterized in terms of their thermophysical conditions, thermal and cycling stability, and health hazard. Two materials out of the 26 candidates achieved the last stage of the selection process. However, one of the two finalists would require an inert working atmosphere, which would highly increase the cost for the real scale application. This leads to a unique suitable material, solar salt (40 wt % KNO 3 /60 wt % NaNO 3 ).

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“…during heating and cooling runs, is due to the difference in the heat of transformation (∆H) during heating and the heat evolved during cooling. However, it is clear that there is a pronounced thermal hysteresis during the reversible transformation of the eutectic (Na 0.6 K 0.4 )NO 3 system [14].…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

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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Overview of PCMs for Concentrated Solar Power in the Temperature Range 200 to 350°C

Cited by 55 publications

References 28 publications

Development of high temperature phase-change-material storages

Development of high temperature phase-change-material storages

Phase Change Material Selection for Thermal Energy Storage at High Temperature Range between 210 °C and 270 °C

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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Overview of PCMs for Concentrated Solar Power in the Temperature Range 200 to 350°C

Cited by 55 publications

References 28 publications

Development of high temperature phase-change-material storages

Development of high temperature phase-change-material storages

Phase Change Material Selection for Thermal Energy Storage at High Temperature Range between 210 °C and 270 °C

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