Experimental and numerical investigation of combined sensible–latent heat for thermal energy storage at 575°C and above

Zanganeh, Giw; Khanna, Raghav; Walser, Christoph; Pedretti, Andrea; Haselbacher, Andreas; Steinfeld, Aldo

doi:10.1016/j.solener.2015.01.022

Cited by 120 publications

(50 citation statements)

References 76 publications

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“…LHS systems use PCM as a storage medium, which offers many advantages such as isothermal behaviour during charging and discharging processes and higher energy storage density, which results in effective reduction of the size of container and construction cost . However, major drawback of PCMs is lower thermal conductivity, which gives poor heat transfer rate during charging and discharging . The reason behind the poor heat transfer rate is due to the convective heat transfer moving away by way of the solid‐liquid interface during phase change, which results in increase of the thermal resistance of the growing layer of solidified PCM, thereby resulting in poor heat transfer rate.…”

Section: Latent Heat Storagementioning

confidence: 99%

“…The reason behind the poor heat transfer rate is due to the convective heat transfer moving away by way of the solid‐liquid interface during phase change, which results in increase of the thermal resistance of the growing layer of solidified PCM, thereby resulting in poor heat transfer rate. To overcome this problem, various techniques for improving the heat transfer rate in an LHS system have been proposed as shown in Figure .…”

Section: Latent Heat Storagementioning

confidence: 99%

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Review on solar thermal energy storage technologies and their geometrical configurations

Suresh

Saini

2020

Int J Energy Res

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Summary Because of the unstable and intermittent nature of solar energy availability, a thermal energy storage system is required to integrate with the collectors to store thermal energy and retrieve it whenever it is required. Thermal energy storage not only eliminates the discrepancy between energy supply and demand but also increases the performance and reliability of energy systems and plays a crucial role in energy conservation. Under this paper, different thermal energy storage methods, heat transfer enhancement techniques, storage materials, heat transfer fluids, and geometrical configurations are discussed. A comparative assessment of various thermal energy storage methods is also presented. Sensible heat storage involves storing thermal energy within the storage medium by increasing temperature without undergoing any phase transformation, whereas latent heat storage involves storing thermal energy within the material during the transition phase. Combined thermal energy storage is the novel approach to store thermal energy by combining both sensible and latent storage. Based on the literature review, it was found that most of the researchers carried out their work on sensible and latent storage systems with the different storage media and heat transfer fluids. Limited work on a combined sensible‐latent heat thermal energy storage system with different storage materials and heat transfer fluids was carried out so far. Further, combined sensible and latent heat storage systems are reported to have a promising approach, as it reduces the cost and increases the energy storage with a stabilized outflow of temperature from the system. The studies discussed and presented in this paper may be helpful to carry out further research in this area.

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Section: Latent Heat Storagementioning

confidence: 99%

Section: Latent Heat Storagementioning

confidence: 99%

Review on solar thermal energy storage technologies and their geometrical configurations

Suresh

Saini

2020

Int J Energy Res

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“…On this basis Munoz-Sanchez et al [22] proposed various PCMs, encapsulation and containment material for high temperatures. Furthermore, Zanganeh et al [61] tested a high temperature combined thermocline on lab scale.…”

Section: Maturity Levelmentioning

confidence: 99%

Assessment of thermal energy storage options in a sodium-based CSP plant

Niedermeier

Flesch

Marocco

et al. 2016

Applied Thermal Engineering

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“…Thermal energy storage systems are a key technology for reduced cost solar thermal power generation [1,2]. Also, they are one possibility for solar thermal power plants to compensate temporary divergences between the availability of sunlight and the demand for electricity.…”

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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Experimental and numerical investigation of combined sensible–latent heat for thermal energy storage at 575°C and above

Cited by 120 publications

References 76 publications

Review on solar thermal energy storage technologies and their geometrical configurations

Review on solar thermal energy storage technologies and their geometrical configurations

Assessment of thermal energy storage options in a sodium-based CSP plant

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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Experimental and numerical investigation of combined sensible–latent heat for thermal energy storage at 575°C and above

Cited by 120 publications

References 76 publications

Review on solar thermal energy storage technologies and their geometrical configurations

Review on solar thermal energy storage technologies and their geometrical configurations

Assessment of thermal energy storage options in a sodium-based CSP plant

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