MATHEMATICAL MODELLING OF LOW GRADE THERMAL ENERGY STORAGE USING AN ENCAPSULATED LIQUID MEDIUM

Year 2020, , 214 - 226, 01.04.2020

Law Torres Sevilla Jovana Radulovic

https://doi.org/10.18186/thermal.711327

Cited By: 1

Abstract

In the present study, we report the results obtained from numerical simulations of low grade heat storage. Four different fluid encapsulated materials were tested in four design types for their suitability as a small scale, low temperature thermal energy storage (TES). This was done by analysing and evaluating the maximum temperature reached per sphere for three different positions inside the tank, which correspond to the top right, centre and bottom right sphere. The influences of the material properties and the inlet/outlet tank designs were analysed and evaluated based on the results. The heat transfer fluid (HTF) was water and the storage materials selected were water, glycerol, MDM and MD3M. These were heated sensibly from an ambient temperature of 20°C to 90°C. The analysis shows that the materials with the highest relevant properties do not in fact charge the tank the fastest. Furthermore, the design of the inlet greatly affects the heating dynamics of the system, whereas changing the outlet design marginally affects the results.

Keywords

Thermal Energy Storage, COMSOL Multiphysics, Storage Material, Sensible Heat

References

• [1] Wu M, Xu C, He Y-L. Dynamic thermal performance analysis of a molten-salt packed-bed thermal energy storage system using PCM capsules. Applied Energy. 2014;121:184-95.
• [2] Peng H, Dong H, Ling X. Thermal investigation of PCM-based high temperature thermal energy storage in packed bed. Energy Conversion and Management. 2014;81:420-7.
• [3] Elouali A, Kousksou T, El Rhafiki T, Hamdaoui S, Mahdaoui M, Allouhi A, et al. Physical models for packed bed: Sensible heat storage systems. Journal of Energy Storage. 2019;23:69-78.
• [4] Almendros-Ibáñez JA, Fernández-Torrijos M, Díaz-Heras M, Belmonte JF, Sobrino C. A review of solar thermal energy storage in beds of particles: Packed and fluidized beds. Solar Energy. 2019;192:193-237.
• [5] Singh H, Saini RP, Saini JS. A review on packed bed solar energy storage systems. Renewable and Sustainable Energy Reviews. 2010;14(3):1059-69.
• [6] White A, Parks G, Markides CN. Thermodynamic analysis of pumped thermal electricity storage. Applied Thermal Engineering. 2013;53(2):291-8.
• [7] McTigue JD, White AJ, Markides CN. Parametric studies and optimisation of pumped thermal electricity storage. Applied Energy. 2015;137:800-11.
• [8] Mertens N, Alobaid F, Frigge L, Epple B. Dynamic simulation of integrated rock-bed thermocline storage for concentrated solar power. Solar Energy. 2014;110:830-42.
• [9] Lugolole R, Mawire A, Lentswe KA, Okello D, Nyeinga K. Thermal performance comparison of three sensible heat thermal energy storage systems during charging cycles. Sustainable Energy Technologies and Assessments. 2018;30:37-51.
• [10] Mawire A, McPherson M, van den Heetkamp RRJ. Thermal performance of a small oil-in-glass tube thermal energy storage system during charging. Energy. 2009;34(7):838-49.
• [11] Ahmed N, Elfeky KE, Qaisrani MA, Wang QW. Numerical characterization of thermocline behaviour of combined sensible-latent heat storage tank using brick manganese rod structure impregnated with PCM capsules. Solar Energy. 2019;180:243-56.
• [12] Ismail KAR, Henrı́quez JR. Numerical and experimental study of spherical capsules packed bed latent heat storage system. Applied Thermal Engineering. 2002;22(15):1705-16.
• [13] Mawire A. Performance of Sunflower Oil as a sensible heat storage medium for domestic applications. Journal of Energy Storage. 2016;5:1-9.
• [14] Lemmon EW, Bell, I.H., Huber, M.L., McLinden. M.O. NIST Standard Reference Database 23: Reference Fluid Thermodynamic and Transport Properties-REFPROP. In: National Institute of Standards and Technology SRDP, editor. 10.0 ed. Gaithersburg2018.
• [15] Association GP. Physical properties of glycerine and its solutions. In: Association GP, editor. New York1963.
• [16] Niyas H, Prasad L, Muthukumar P. Performance investigation of high-temperature sensible heat thermal energy storage system during charging and discharging cycles. Clean Technologies and Environmental Policy. 2015;17(2):501-13.
• [17] Kylili A. TM, Ioannou I., Fokaides P.A. Numerical heat transfer analysis of Phase Change Materials (PCM) – enhanced plaster. 2016 COMSOL Conference. Munich2016.
• [18] Bataineh K, Gharaibeh A. Optimal design for sensible thermal energy storage tank using natural solid materials for a parabolic trough power plant. Solar Energy. 2018;171:519-25.
• [19] Whitaker S. Forced convection heat transfer correlations for flow in pipes, past flat plates, single cylinders, single spheres, and for flow in packed beds and tube bundles. AIChE Journal. 1972;18(2):361-71.
• [20] Ellendt N, Lumanglas AM, Moqadam SI, Mädler L. A model for the drag and heat transfer of spheres in the laminar regime at high temperature differences. International Journal of Thermal Sciences. 2018;133:98-105.