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Numerical simulation study on discharging process of the direct-contact phase change energy storage system
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2015 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 150, 61-68 p.Article in journal (Refereed) Published
Abstract [en]

The mobilized thermal energy storage system (M-TES) has been demonstrated as a promising technology to supply heat using waste heat in industries to distributed users, where heat discharging determines whether M-TES system can satisfy the required heating rate. The objective of this work is to investigate the solidification mechanism of phase change materials (PCM) for heat discharging in a direct-contact thermal energy storage (TES) container for M-TES. A 2-dimensional (2D) numerical simulation model of the TES tank is developed in ANSYS FLUENT, and validated with the experimental measurement. Effects of flow rate and inlet temperature of heat transfer oil (HTO) were studied. Results show that (a) the discharging process includes the formation of solidified PCM followed by the sinking of solidified PCM; (b) the discharging time of M-TES can be reduced by increasing the flow rate of heat transfer oil. When the flow rate is increased from 0.46m3/h to 0.92m3/h, the solidified PCM is increased from 25vol.% to 90vol.% within 30min; (c) the discharging time can be reduced by decreasing the inlet temperature of HTO. While the inlet temperature is reduced from 50°C to 30°C, the solidified PCM is increased from 60vol.% to 90vol.% within 30min. This work provides engineering insights for the rational design of discharging process for M-TES system.

Place, publisher, year, edition, pages
2015. Vol. 150, 61-68 p.
Keyword [en]
Computational fluid dynamics, Mobilized thermal energy storage system, Phase change materials, Solidification, Energy storage, Flow rate, Heat storage, Heat transfer, Inlet flow, Numerical models, Oil shale, Storage (materials), Thermal energy, Waste heat, Direct contact, Discharging process, Inlet temperature, Numerical simulation studies, Rate of heat transfer, Rational design, Thermal energy storage systems
National Category
Energy Systems
URN: urn:nbn:se:kth:diva-167693DOI: 10.1016/j.apenergy.2015.03.108ISI: 000356122500007ScopusID: 2-s2.0-84927934251OAI: diva2:816069
ÅForsk (Ångpanneföreningen's Foundation for Research and Development)

QC 20150602

Available from: 2015-06-02 Created: 2015-05-22 Last updated: 2015-07-06Bibliographically approved

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Yan, Jinyue
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