International Scientific Journal


In order to improve the thermal performance of thermal energy storage systems, a packed bed thermal energy storage systems unit using spherical capsules filled with multiple phase change materials (multi-PCM) for use in conventional air-conditioning systems is presented. A 3-D mathematical model was established to investigate the charging characteristics of the thermal energy storage systems unit. The optimum proportion between the multi-PCM was identified. The effects of heat transfer fluid-flow rate and heat transfer fluid inlet temperature on the liquid phase change materials volume fraction, charging time and charging capacity of the thermal energy storage system unit are studied. The results indicate that the charging capacity of multi-PCM units is higher than that of the conventional single-PCM (HY-2). For proportions 0:1:0, 2:3:3, 3:2:3, 3:3:2, 4:1:3, and 4:2:2, the charging capacity decreases by approximately 24.84%, 14.69%, 6.47%, 3.82%, and 1.13%, respectively, compared to the 4:2:2 proportion. Moreover, decreasing the heat transfer fluid inlet temperature can obviously shorten the complete charging time of the thermal energy storage systems unit.
PAPER REVISED: 2017-11-25
PAPER ACCEPTED: 2017-11-26
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2018, VOLUME 22, ISSUE Supplement 2, PAGES [S527 - S533]
  1. Rismanchi, B., Saidur, R., et al., Energetic, economic and environmental benefits of utilizing the ice thermal storage systems for office building applications. Energy & Buildings, 50(2012), 7, pp. 347-354
  2. Stathopoulos, N., Mankibi, M. E., et al., Air-PCM heat exchanger for peak load management: Experimental and simulation. Solar Energy, 132(2016), pp. 453-466
  3. Li, X. Y., Zhao, Q. Q., et al., Investigation on the dynamic characteristics of a direct contact thermal energy storage charging process for use in conventional air-conditioning systems. Applied Thermal Engineering, 91(2015), pp. 172-180
  4. Mosaffa, A. H., Ferreira, C. A. I., et al., Thermal performance of a multiple PCM thermal storage unit for free cooling. Energy Conversion & Management, 67(2013), 2, pp. 1-7
  5. Bourne. S., Novoselac. A., Improved performance in tube-encapsulated phase change thermal energy stores for HVAC applications. Building & Environment, 98(2016), pp. 133-144
  6. Li, X. Y., Li, L., et al., Investigation of the dynamic characteristics of a storage tank discharging process for use in conventional air-conditioning system. Solar Energy, 96(2013), 9, pp. 300-310
  7. Li, Z., Wu, Z. G., Analysis of HTFs, PCMs and fins effects on the thermal performance of shell-tube thermal energy storage units. Solar Energy, 122(2015), 2, pp. 382-395
  8. Seeniraj, R. V., Narasimhan, N. L., Performance enhancement of a solar dynamic LHTS module having both fins and multiple PCMs. Solar Energy, 82(2008), 6, pp. 535-542
  9. Tessier, M. J., Floros, M. C., et al. Exergy analysis of an adiabatic compressed air energy storage system using a cascade of phase change materials. Energy, 106(2016), pp. 528-534
  10. Liu, S., Iten, M., et al., Numerically Study the Performance of An Air—multiple PCMs unit for Free Cooling and Ventilation. Energy & Buildings, 151(2017), pp. 520-533
  11. Aldoss, T. K., Rahman, M. M., Comparison between the single-PCM and multi-PCM thermal energy storage design. Energy Conversion & Management, 83(2014), 4, pp. 79-87
  12. Chiu, J. N. W., Martin, V., Multistage latent heat cold thermal energy storage design analysis. Applied Energy, 112(2013), 16, pp. 1438-1445
  13. Peiró, G., Gasia, J., et al., Experimental evaluation at pilot plant scale of multiple PCMs (cascaded) vs. single PCM configuration for thermal energy storage. Renewable Energy, 83(2015), pp. 729-736
  14. Shaikh, S., Lafdi, K., Effect of multiple phase change materials (PCMs) slab configurations on thermal energy storage. Energy Conversion & Management, 47(2006), pp. 2103-2117
  15. Hu, Z., Li, A., et al., Enhanced heat transfer for PCM melting in the frustum-shaped unit with multiple PCMs. Journal of Thermal Analysis & Calorimetry, 120(2015), 2, pp. 1407-1416
  16. Wang, P., Wang, X., et al., Thermal energy charging behaviour of a heat exchange device with a zigzag plate configuration containing multi-phase-change-materials (m-PCMs). Applied Energy, 142(2015), pp. 328-336
  17. Brent, A. D., Voller, V. R., et al., Enthalpy-porosity technique for modeling convection-diffusion phase change: application to the melting of a pure metal. Numerical Heat Transfer Applications, 13(1988), 3, pp. 297-318

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence