太阳能热水器传热传质和强化传热研究

在低温太阳能光热光伏联合应用试验台的基础上,结合GB/T 17049—2005,利用Gambit、Ansys Fluent和Tecplot软件,对全玻璃真空管太阳能热水器进行传热传质和强化传热分析。结果表明:所建立的二维数值计算模型,能准确反映同一条件下,全玻璃真空管太阳能热水器的变化趋势;在数值模拟基础上,确定了单面受热时的最佳安装角度为51°,加装反光板类似双面受热的最佳安装角度为38°;在粗略估算和细化分析的基础上,确定了不同真空管结构的最佳导流板长度及安装位置;通过实验和数值模拟,确定了58mm×1 800mm为优化的全玻璃真空管结构。

Study of Heat and Mass Transfer and Strengthen Heat Transfer for Solar Water Heater

The study of heat and mass transfer and strengthen heat transfer for all-glass evacuated tube solar water heater is carried out with Gambit and Ansys Fluent and Tecplot and GB/T 17049---2005 on the basis of the joint application test bench for solar-thermal photovohaic in low temperature. The results show that the established two-dimensional numerical model can accurately reflect the change trend of all-glass evacuated tube solar water heater in the same conditions. The best installation angle are determined that the single side heated is 51 degrees and the double side heated with reflector is 38 degrees on the basis of numerical simulation. The optimization length of guide plate and the best installation position for different evacuated tube structure are de termined on the basis of rough and detailed analysis. The optimization structure of all glass evacuated tube is Ф58× 1800 through experiment and numerical simulation.