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Enhancing the melting of phase change material using a fins–nanoparticle combination in a triplex tube heat exchanger
Journal of Energy Storage ( IF 9.4 ) Pub Date : 2021-01-17 , DOI: 10.1016/j.est.2020.102227
Ammar M. Abdulateef , Marek Jaszczur , Qusay Hassan , R Anish , Hakeem Niyas , Kamaruzzaman Sopian , Jasim Abdulateef

A combination of heat transfer augmentation techniques is highly necessary to enhance the performance of Thermal Energy Storage (TES) systems employed in a wide range of applications. The major issue is that many of the Phase Change Materials (PCMs) possess low thermal conductivity (k0.2 W/m K), resulting in an inefficient melting process. Triplex Tube Heat Exchanger (TTHX) based TES system is both numerically and experimentally studied using Paraffin (RT82) with Alumina (Al2O3) nanoparticles that has a charging temperature in the range of 78.15–82.15 C. The experimental findings indicate that the Paraffin is not completely melted within the required time of four hours for the inside heating method at 97 C. The Paraffin is successfully melted for both sides heating at 90 C in lesser time and average temperature than the outside heating. With different charging temperatures, the Paraffin melting was consumed a short time for the non steady state at the mass flow rate of 29.4 kg/min, compared with the 16.2 and 37.5 kg/min for inner and outer tubes. Other outcomes were that with the fins–nanoparticle combination, an improved performance for melting the Paraffin, compared with those that occurred without nanoparticle. Furthermore, in the numerical study, compared with the pure Paraffin case, the melting time was minimized for TTHX with longitudinal fins (12%) and TTHX with triangular fins (22%) for the PCM having 10% nanoparticle, respectively. Close agreement is found between the numerical and experimental findings.



中文翻译:

在三重管式换热器中使用鳍片-纳米颗粒组合增强相变材料的熔化

为了增强广泛应用中所采用的热能存储(TES)系统的性能,非常需要组合传热增强技术。主要问题是许多相变材料(PCM)的导热系数很低(ķ0.2 W / m K),导致熔化过程效率低下。基于三重管式换热器(TTHX)的TES系统在使用石蜡(RT82)和氧化铝(Al 2 O 3)纳米颗粒的情况下进行了数值和实验研究,其充电温度在78.15–82.15范围内C。实验结果表明石蜡在97的内部加热方法所需的四小时内没有完全融化C。石蜡已成功融化,可将两面加热至90度C比外部加热所需的时间和平均温度短。在不同的装料温度下,石蜡熔化在非稳态下消耗的时间很短,质量流量为29.4 kg / min,而内管和外管的熔化流速分别为16.2和37.5 kg / min。与没有纳米颗粒的情况相比,使用鳍片-纳米颗粒的组合还可以改善石蜡的熔化性能。此外,在数值研究中,与纯石蜡的情况相比,具有10%纳米颗粒的PCM的带有纵向鳍片的TTHX(12%)和带有三角鳍的TTHX(22%)的熔融时间分别最小化。在数值和实验结果之间发现了紧密的一致性。

更新日期:2021-01-18
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