太阳能平板集热器的热性能研究的实验和数值方法
Shiva Singh1, Kuwar Mausam1,2, Subrata Kumar Ghosh3
1Department of Mechanical Engineering, Indian Institute of Technology (ISM), Dhanbad, India.
这项研究探讨了使用铜多壁碳纳米管 (Cu-MWCNT) 混合纳米流体的太阳能平板集热器的热性能. 实验和数值结果显示,纳米流体显著提高了79.74%的效率.
科学领域:
- 可再生能源工程可再生能源工程
- 纳米技术纳米技术
- 热科学 热科学 热科学
背景情况:
- 太阳能平板收集器 (FPC) 对于太阳能热能转换至关重要.
- 提高FPC的热性能对于高效的太阳能利用至关重要.
- 纳米流体为传热应用提供了改进的热物理性能.
研究的目的:
- 为了研究太阳能平板集热器 (FPC) 的热性能,使用含铜和多壁碳纳米管 (Cu-MWCNT) 的水基混合纳米流体.
- 通过实验和数值评估各种操作参数对FPC效率的影响.
- 对实验数据进行数值模型的验证,用于分析FPC中的纳米流体行为.
主要方法:
- 使用X射线衍射 (XRD) 和场发射扫描电子显微镜 (FESEM) 的纳米粒子特征与能量分散X射线 (EDAX) 映射.
- 在不同流速,倾角,体积度和太阳强度下进行FPC热性能测试的实验设置.
- 使用Fluent 15.0与SST流模型进行3D数值建模,以模拟流体流动和热传递.
主要成果:
- 在0.4%体积时,获得了79.74%的最大即时效率提高. -MWCNT纳米流体在1.5LPM流速,45°倾斜,和400W/m2强度.
- 数值模型显示,实验值和计算值之间的温度差异 (ΔT) 的最大偏差为3.5%.
- 在数值和实验结果之间,即时效率和热量增益分别偏离了2.8%和2.9%.
结论:
- Cu-MWCNT混合纳米流体显著提高了太阳能平板集热器的热性能.
- 经过验证的数值模型为可视化温度和流量模式提供了可靠的工具,有助于FPC设计和优化.
- 这项研究证明了纳米流体在改善太阳能热能系统方面的潜力.
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