Experimental study on energy storage performances of packed bed with different solid materials

Hao Zhou, Zhenya Lai and Kefa Cen

Energy, 2022, vol. 246, issue C

Abstract: The physical properties of the solid materials as energy storage mediums are one of the main parameters that affect the design of the packed bed. Different solar applications may require different heating rates and temperatures, so choosing appropriate storage materials is essential. This paper compares the applicability of sintered ore particles, aluminium oxide balls, and rock crushed as sensible heat storage materials. The results show that the volumetric heat capacity of the sinter at 200 °C is 3253.7 kJ/(m3·K), which is between aluminium oxide and rock. Rock is only suitable for heat storage below 550 °C, while sinter is the best candidate material for storing heat at ultra-high temperatures as high as 1000 °C. Moreover, the energy storage tests of packed beds using three materials under different operating conditions were also carried out. The results show that the heat capacity and voidage of the bed are the most critical factors affecting the thermal behavior of the bed, while the thermal conductivity of the material has a minor effect. After the system is stable, the energy recovery efficiency of the rock, aluminium oxide and sinter bed can reach 73.7%, 69.3%, and 66.8%, respectively, at a flow rate of 175 m3/h.

Keywords: Thermal energy storage; Packed bed; Thermal performance; Storage materials; Thermocline characteristics (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:246:y:2022:i:c:s036054422200319x

DOI: 10.1016/j.energy.2022.123416

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