Plate type heat exchanger for thermal energy storage and load shifting using phase change material

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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“…Rami et al presented a novel plate type heat exchanger for LTES. Hexadecane is chosen as a storage medium and water as an HTF for the system.…”

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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“…Moreover, in real LHTES systems, the HTF inlet temperature and/or flow rate are usually constant and cannot be changed. Therefore, some researchers concluded that there exists an optimal HTF flow rate to obtain the best thermal performance of the HX when HTF inlet temperature [40] or HTF input power [41] are set.…”

Section: The Influence Of Htf Inlet Parametersmentioning

confidence: 99%

“…Compared to the other types of HXs, plate HXs could obtain high effectiveness, up to 0.82 [40]. Moreover, Gürel [63] found that the melting time of a PCM in plate HX decreased by 75%, compared to the double-tube heat exchanger (DTHX) with the same volume of the PCM.…”

Section: Plate Heat Exchangersmentioning

confidence: 99%

“…The influence of geometrical parameters of plate HXs on its thermal behavior was investigated by several researchers. Saeed et al [40] found that using 20 plates with HTF instead of 10 resulted in a shorter melting time (the researchers did not report the exact value of improvement), but the volume occupied by 20 plates was higher by 1.3%, compared to 10 plates. Gürel [63] and Hoseinzadeh et al [64] also concluded that when the mass of PCM was constant, increasing the number of plates with HTF led to a shorter melting time, but the researchers did not provide the exact values of the time reduction.…”

Section: Plate Heat Exchangersmentioning

confidence: 99%

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The Impact of Heat Exchangers’ Constructions on the Melting and Solidification Time of Phase Change Materials

et al. 2020

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An application of latent heat thermal energy storage systems with phase change materials seems to be unavoidable in the present world. The latent heat thermal energy storage systems allow for storing excessive heat during low demand and then releasing it during peak demand. However, a phase change material is only one of the components of a latent heat thermal energy storage system. The second part of the latent heat thermal energy storage is a heat exchanger that allows heat transfer between a heat transfer fluid and a phase change material. Thus, the main aim of this review paper is to present and systematize knowledge about the heat exchangers used in the latent heat thermal energy storage systems. Furthermore, the operating parameters influencing the phase change time of phase change materials in the heat exchangers, and the possibilities of accelerating the phase change are discussed. Based on the literature reviewed, it is found that the phase change time of phase change materials in the heat exchangers can be reduced by changing the geometrical parameters of heat exchangers or by using fins, metal foams, heat pipes, and multiple phase change materials. To decrease the phase change material’s phase change time in the tubular heat exchangers it is recommended to increase the number of tubes keeping the phase change material’s mass constant. In the case of tanks filled with spherical phase change material’s capsules, the capsules’ diameter should be reduced to shorten the phase change time. However, it is found that some changes in the constructions of heat exchangers reduce the melting time of the phase change materials, but they increase the solidification time.

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“…Different heat exchangers are used to discharge the heat from the thermal storage tank, such as heat pipe heat exchanger, finned tube air heat exchanger, shell tube heat exchanger, mantle heat exchanger, triplex tube heat exchanger, and plate heat exchanger . Meanwhile, the single tank integrating a coil heat exchanger (CHE) with annular baffle is proposed to effectively discharge heat.…”

Section: Introductionmentioning

confidence: 99%

Optimal research of annular baffle for heat‐discharging performance of single thermal storage tank with molten salt

Zhang

Shi

et al. 2020

Int J Energy Res

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The single thermal energy storage tank (STEST) has been extensively investigated because of the advantage of cost and efficiency. This research presents heat discharging performance of STEST using coil heat exchanger (CHE) with annular baffle at different working conditions. The heat discharging performance, flow field and temperature distribution of different parameters of the annular baffle are presented and discussed. The results show that the heat discharging time decreases with an increase inlet air velocity of the CHE. The heat discharging efficiency is up to 95.7% in this study, and the heat discharging time can reach to 18.7 hours. In addition, optimal dimensionless diameters of annular baffle are D b /D t = 0.6, H s /H t = 0.075 and H x /H t = 0.050 (H s is the height from the top of baffle to the top of tank. H t is the height of the tank. H x is the height from bottom of the baffle to the bottom of the tank). The efficiency of heat discharging process can be enhanced with optimal dimensions of the annular baffle. This study presents a direct practicable guide to design the STEST. K E Y W O R D S annular baffle, coil heat exchanger, heat discharging, single thermal energy storage tank

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Plate type heat exchanger for thermal energy storage and load shifting using phase change material

Cited by 74 publications

References 23 publications

Review on solar thermal energy storage technologies and their geometrical configurations

Review on solar thermal energy storage technologies and their geometrical configurations

The Impact of Heat Exchangers’ Constructions on the Melting and Solidification Time of Phase Change Materials

Optimal research of annular baffle for heat‐discharging performance of single thermal storage tank with molten salt

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