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Melting enhancement of a latent heat storage with dispersed Cu, CuO and Al 2 O 3 nanoparticles for solar thermal application
Renewable Energy ( IF 8.7 ) Pub Date : 2018-06-01 , DOI: 10.1016/j.renene.2018.01.013 Dawit Gudeta Gunjo , Smruti Ranjan Jena , Pinakeswar Mahanta , P.S. Robi
Renewable Energy ( IF 8.7 ) Pub Date : 2018-06-01 , DOI: 10.1016/j.renene.2018.01.013 Dawit Gudeta Gunjo , Smruti Ranjan Jena , Pinakeswar Mahanta , P.S. Robi
Abstract The performance of all latent heat storage system depends on the quality of phase change material used. In the present study, paraffin-based nanofluid dispersed with 5% of Cu, 5% of CuO and 5% of Al2O3 nanoparticles are used to investigate its effect on the storage characteristics. A 3-D numerical model of a shell and tube regenerative type latent heat storage is developed using®COMSOL Multiphysics 4.3a to predict the average temperature and melt fraction of paraffin-based nanofluid. The validation with the established pieces of literature and experiments indicated a sound agreement. The effect of adding nanoparticles on melting/solidification rate and energy storing/releasing rate are also studied. The result revealed that addition of 5% of Cu, 5% of Al2O3 and 5% of CuO nanoparticles improved the melting rate by 10 times, 3.46 times and 2.25 times and the discharged rate by 8 times, 3 times and 1.7 times, respectively compared to the pure paraffin filled latent heat storage system. However, it decreased the specific heat and heat of fusion which reduced the sensible and latent heat storing capacity. Additionally, orientations of cylinder and tube arrangement are also studied numerically using paraffin as phase change material.
中文翻译:
用于太阳能热应用的具有分散的 Cu、CuO 和 Al 2 O 3 纳米颗粒的潜热储存的熔化增强
摘要 所有潜热蓄热系统的性能取决于所用相变材料的质量。在本研究中,使用分散有 5% Cu、5% CuO 和 5% Al2O3 纳米颗粒的石蜡基纳米流体来研究其对存储特性的影响。使用 COMSOL Multiphysics 4.3a 开发了壳管蓄热式潜热存储的 3D 数值模型,以预测石蜡基纳米流体的平均温度和熔体分数。已建立的文献和实验的验证表明了良好的一致性。还研究了添加纳米颗粒对熔化/固化速率和能量储存/释放速率的影响。结果表明,添加5%的Cu、5%的Al2O3和5%的CuO纳米颗粒使熔化速率提高10倍,3. 与纯石蜡填充潜热蓄热系统相比,分别提高了46倍和2.25倍,排放率分别提高了8倍、3倍和1.7倍。然而,它降低了比热和熔化热,从而降低了显热和潜热储存能力。此外,还使用石蜡作为相变材料对圆柱和管排列的方向进行了数值研究。
更新日期:2018-06-01
中文翻译:
用于太阳能热应用的具有分散的 Cu、CuO 和 Al 2 O 3 纳米颗粒的潜热储存的熔化增强
摘要 所有潜热蓄热系统的性能取决于所用相变材料的质量。在本研究中,使用分散有 5% Cu、5% CuO 和 5% Al2O3 纳米颗粒的石蜡基纳米流体来研究其对存储特性的影响。使用 COMSOL Multiphysics 4.3a 开发了壳管蓄热式潜热存储的 3D 数值模型,以预测石蜡基纳米流体的平均温度和熔体分数。已建立的文献和实验的验证表明了良好的一致性。还研究了添加纳米颗粒对熔化/固化速率和能量储存/释放速率的影响。结果表明,添加5%的Cu、5%的Al2O3和5%的CuO纳米颗粒使熔化速率提高10倍,3. 与纯石蜡填充潜热蓄热系统相比,分别提高了46倍和2.25倍,排放率分别提高了8倍、3倍和1.7倍。然而,它降低了比热和熔化热,从而降低了显热和潜热储存能力。此外,还使用石蜡作为相变材料对圆柱和管排列的方向进行了数值研究。