Abstract
Latent heat thermal energy storage using phase change materials (PCM) has become a topic of interest as it has the advantages of high energy storage density. Encapsulated PCM energy storage systems are being widely studied as they have large heat transfer area available for charging by the heat transfer fluid (HTF). The shape of the capsules can considerably affect the melting rate and thus the energy charging characteristics. In this work, a numerical analysis of encapsulated PCM system with a single capsule but with different shapes has been carried out by developing a 3D finite volume-based model. The developed model is used to predict the melting and energy storage rates of spherical, cuboidal, cylindrical and triangular prism-shaped capsules keeping the PCM volume constant. It is observed that the time required for melting is reduced by 3, 10.39, 22.64, 11.68% for cubical, horizontal cylinder, horizontal prism and vertical prism capsules as compared to the spherical capsule having the same volume. Thus, the horizontal prism capsule has the best melting and energy storage rates among all the considered shapes.
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Abbreviations
- Cp:
-
Specific heat (J/kgK)
- \({f}_{l}\):
-
Volume fraction of liquid PCM
- H:
-
Volume-averaged enthalpy (J/kg)
- K:
-
Thermal conductivity (W/mK)
- P:
-
Pressure (N/m2)
- R:
-
Resistance source coefficient
- SB:
-
Boussinesq source term
- t:
-
Time
- T:
-
Temperature
- Tin:
-
Inlet temperature
- \(\overrightarrow{U}\):
-
Velocity (m/s)
- u, v, w:
-
x, y, z Velocity component (m/s)
- win:
-
Inlet velocity
- x,y,z:
-
X, Y, Z coordinate (m)
- \(\rho\):
-
Density (kg/m3)
- \(\mu\):
-
Viscosity (Ns/m2)
References
Zhang Y, Faghri A (1996) Heat transfer enhancement in latent heat thermal energy storage system by using the internally finned tube. Int J Heat Mass Transf 39(15):3165–3173
Dinesh BVS, Bhattacharya A (2019) Effect of foam geometry on heat absorption characteristics of PCM-metal foam composite thermal energy storage systems. Int J Heat Mass Transf 134:866–883
Ho CJ, Gao JY (2009) Preparation and thermophysical properties of nanoparticle-in-paraffin emulsion as phase change material. Int Commun Heat Mass Transfer 36(5):467–470
Bellan S, Gonzalez-Aguilar J, Romero M, Rahman MM, Goswami DY, Stefanakos EK, Couling D (2014) Numerical analysis of charging and discharging performance of a thermal energy storage system with encapsulated phase change material. Appl Therm Eng 71(1):481–500
Tan FL (2008) Constrained and unconstrained melting inside a sphere. Int Commun Heat Mass Transfer 35(4):466–475
Khodadadi JM, Zhang Y (2001) Effects of buoyancy-driven convection on melting within spherical containers. Int J Heat Mass Transf 44(8):1605–1608
Veerappan M, Kalaiselvam S, Iniyan S, Goic R (2009) Phase change characteristic study of spherical PCMs in solar energy storage. Sol Energy 83(8):1245–1252
Narasimhan NL, Bharath R, Ramji SA, Tarun M, Arumugam AS (2014) Numerical studies on the performance enhancement of an encapsulated thermal storage unit. Int J Therm Sci 84:184–195
Fan LW, Zhu ZQ, Xiao SL, Liu MJ, Lu H, Zeng Y, Yu ZT, Cen KF (2016) An experimental and numerical investigation of constrained melting heat transfer of a phase change material in a circumferentially finned spherical capsule for thermal energy storage. Appl Therm Eng 100:1063–1075
Cheng X, Zhai X (2017) Thermal performance analysis of a novel PCM capsule in red blood cell shape. Appl Therm Eng 120:130–137
Awasthi A, Kumar B, Nguyen HH, Lee SS, Chung JD (2020) Effect of sinusoidal cylindrical surface of PCM on melting performance. J Mech Sci Technol 34(8):3395–3402
Patel JR, Joshi V, Rathod MK (2020) Thermal performance investigations of the melting and solidification in differently shaped macro-capsules saturated with phase change material. J Energy Stor 31:101635
Dinesh BVS, Bhattacharya A (2020) Comparison of energy absorption characteristics of PCM-metal foam systems with different pore size distributions. J Energy Stor 28:101190
Parida A, Bhattacharya A, Rath P (2020) Effect of convection on melting characteristics of phase change material-metal foam composite thermal energy storage system. J Energy Stor 32:101804
Athawale V, Bhattacharya A, Rath P (2021) Prediction of melting characteristics of encapsulated phase change material energy storage systems. Int J Heat Mass Transf 181:121872
Athawale V, Jakhar A, Jegatheesan M, Rath P, Bhattacharya A (2022) A 3D resolved-geometry model for unstructured and structured packed bed encapsulated phase change material system. J Energy Stor 51:104430
Acknowledgements
This work has been supported by DST (Department of Science and Technology) SERB project CRG/2021/003780.
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Kopparthi, T., Athawale, V., Rath, P., Bhattacharya, A. (2024). Effect of Capsule Shape on Melting and Energy Storage Rates for Encapsulated PCM-Based Systems. In: Das, S., Mangadoddy, N., Hoffmann, J. (eds) Proceedings of the 1st International Conference on Fluid, Thermal and Energy Systems . ICFTES 2022. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-99-5990-7_25
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DOI: https://doi.org/10.1007/978-981-99-5990-7_25
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