Numerical study of integrated latent heat thermal energy storage devices using nanoparticle-enhanced phase change materials
Numerical study of integrated latent heat thermal energy storage devices using nanoparticle-enhanced phase change materials
复制标题
使用纳米颗粒增强相变材料的集成潜热热能储存装置的数值研究
DOI：
10.1016/j.solener.2019.10.015
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发表时间：
2019-12-01
期刊：
影响因子：
6.7
通讯作者：
Ding, Y.
中科院分区：
文献类型：
--
作者：
Akhmetov, B.;Navarro, M. E.;Ding, Y.
采用Comsol Multiphysics软件对基于不同相变温度范围的石蜡（PW）、PW- l和PW- h的连续集成LHTES装置进行了数值研究。对PWs的热性能进行了表征，并将氧化铝纳米颗粒（纳米al2o3）分散到PWs中以提高其传热能力。激光闪蒸实验结果表明，当纳米al2o3含量达到PW-L质量的4 wt%时，PW-L的热扩散率可提高40%。同样数量的纳米al2o3使PW-H的热扩散率提高了约25%。进一步的表征研究表明，纳米al2o3的掺入并没有显著改变相变材料的比热容、熔化潜热和冷却潜热，但提高了相变材料的传热效率。在器件工作状态的数值模拟中，将测量到的pcm热性能作为输入数据。当纳米al2o3含量分别为pcm质量的2 wt%和4 wt%时，集成LHTES器件的完全充电时间分别缩短了57 min和106 min。同样，纳米al2o3的加入使集成器件的完全放电时间分别缩短了32 min和74 min。这种减少导致了LHTES器件的充电和放电效率的提高。此外，模拟结果表明，器件中存储能量的总量与差示扫描量热法（DSC）的结果相当接近。
Two sequentially integrated LHTES devices based on paraffin waxes (PW), PW-L and PW-H with different phase change temperature ranges are numerically studied using Comsol Multiphysics for efficient thermal energy storage (TES). Thermal properties of the PWs are characterized and aluminum oxide nanoparticles (nano-Al2O3) are dispersed into the PWs to improve their heat transfer ability. According to the laser flash apparatus results, when the nano-Al2O3 composes 4 wt% of the mass of the PW-L, its thermal diffusivity can be enhanced up to 40%. The same amount of the nano-Al2O3 improves the thermal diffusivity of the PW-H approximately by 25%. Further characterization studies show that the incorporation of the nano-Al2O3 does not significantly change the specific heat capacity, latent heat of melting and cooling of the PCMs, but improves the heat transfer efficiency of the PCMs. Measured thermal properties of the PCMs are considered as input data in the numerical simulation of operating regimes of the devices. The full charging time of the integrated LHTES devices is reduced by 57 min and 106 min when the nano-Al2O3 composed 2 wt% and 4 wt% of the mass of the PCMs respectively. Likewise, the full discharging time of the integrated devices is decreased by 32 min and 74 min by the addition of the nano-Al2O3. Such reductions lead to improved charging and discharging efficiency of the LHTES devices. Moreover, simulation results show that the total amount of the stored energy in the devices fairly approximates the differential scanning calorimetry (DSC) results.