Numerical study of high-temperature cascaded packed bed thermal energy storage system

Sun, Yongjian; Ying, Han; Li, G.D.; Shen, Huaya; Chi, X.M.; Zhang, C.Y.

doi:10.1016/j.csite.2022.102258

Cited by 15 publications

(2 citation statements)

References 28 publications

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“…The present numerical model is validated by comparing it with the experimental findings of Regin et al 30 and the numerical results of Sun et al 25 The experimental study has investigated a spherical capsule of 49 mm radius filled with paraffin wax; however, water act as a HTF at a temperature ranging from 70°C to 82°C. The PCM temperatures were noted at different x /L, where x is the thermocouple location, and L is the sphere radius.…”

Section: Computational Modelmentioning

confidence: 81%

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Modeling and analysis of PCM‐encapsulated solar thermal energy storage system for space heating

Soni,

Reddy,

Reddy

2023

Energy Storage

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In this study, a phase change material (PCM)‐encapsulated packed‐bed thermal energy storage (PB‐TES) system is intended for Day‐round space heating in the winter. Solar concentric collectors act for day‐time heating and TES charging, while the stored energy can be used at night and intermediate time for space heating. A region‐wise techno‐economic analysis of PCM candidates is made to compare the costs and sizes of solar collectors and PB‐TES. A spherical capsule filled with sodium nitrite (NaNO2) and sodium nitrate (NaNO3) is numerically investigated during the PCM charging at constant thermal input. After complete liquefication, the charging time for NaNO2 and NaNO3 capsules is 3280 and 4300 s, respectively, holding the maximum stored energy of 733.4 KJ/kg at 285°C and 687.27 kJ/kg at 310.12°C, respectively. In addition, the stored exergy is obtained 238.78 and 234.74 kJ/kg for NaNO2 and NaNO3, respectively; however, the average exergetic effectiveness for NaNO2 and NaNO3 are 0.54 and 0.46. Despite the lower energy storage capacity (kJ/kg) of NaNO3, the PB‐TES volume is less with NaNO3 than with NaNO2 due to higher density. However, the average cost ($/tonne) of NaNO3 PCM is 50% higher than NaNO2. Subsequently, the thermal efficiency of the proposed system is estimated at 27.68% and 26.94% during day and night‐time operations.

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Section: Computational Modelmentioning

confidence: 81%

“…The equations set, in the form available in the theory guide of ANSYS (2019), are used to get the ample distribution of various parameters in the computational domain. However, the energy equation for the PCM computational domain is explained in Equation (5), 25 (ANSYS, 2019).…”

Section: Mathematical Formulationsmentioning

confidence: 99%