Thermal energy storage in a fluidized bed of PCM
Thermal energy storage in a fluidized bed of PCM
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DOI：
10.1016/j.cej.2013.06.112
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发表时间：
2013-08-15
影响因子：
15.1
通讯作者：
Almendros-Ibanez, J. A.
中科院分区：
文献类型：
--
作者：
Izquierdo-Barrientos, M. A.;Sobrino, C.;Almendros-Ibanez, J. A.
本研究的目的是研究粒径较小（d(p) = 0.54 mm）的粒状相变材料（PCM）在流化床中的储存行为。将流化床的性能与常用的砂流化床和砂- PCM填料流化床进行了比较。为此，在以空气为工质的圆柱床上进行了加热实验。分析了床层高度和流量对PCM流化床储存和回收效率的影响。此外，还研究了PCM在不同充放电周期下的稳定性。结果表明，该PCM是一种可用于流化床系统的替代材料，可提高潜热形式的热能储存效率。在本研究的实验条件下，基于PCM的固定床和流化床的装药效率均高于砂床。高气速和低床层高度缩短了装药时间，但也降低了装药效率。循环试验表明，PCM在鼓泡条件下稳定运行15次，相当于连续运行约75小时。(C) 2013 Elsevier B.V.版权所有
The objective of the present work was to research the storage behavior of a fluidized bed filled with a granular phase change material (PCM) with a small particle diameter (d(p) = 0.54 mm). The performance of the fluidized bed was compared to that of well-known storage methods such as fluidized beds with sand and packed beds based of sand and PCM. For this purpose, heating experiments were conducted in a cylindrical bed with air as the working fluid.The influence of the bed height and flow rate on the storage and recovery efficiencies of the fluidized bed of PCM was analyzed. Additionally, the stability of the PCM during various charging-discharging cycles was studied.The results indicate that this PCM is an alternative material that can be used in fluidized bed systems to increase the efficiency of storing thermal energy in the form of latent heat. Under the experimental conditions tested in this study, higher charging efficiencies were observed for fixed and fluidized beds based on PCM than those of sand. High gas velocity and low bed height shorten the charging time but also reduce the charging efficiency. The cycling test shows that the PCM is stable under bubbling conditions up to 15 cycles, which corresponds to approximately 75 h of continuous operation. (C) 2013 Elsevier B.V. All rights reserved.