强化太阳能相变蓄热技术的研究进展

为解决太阳能的间歇性问题,常将其与相变蓄热技术进行结合。与传统显热蓄热相比,相变蓄热可将蓄热能量提高数倍以上,具有巨大的研究和应用价值。本文总结分析了相变蓄热的传热机制及在强化太阳能相变蓄热技术上的研究手段,如变换蓄热结构、添加肋片、使用相变胶囊、充注多相变材料、蓄热材料中添加高导热物质等。分析结果显示,相变传热机制中,融化过程主要考虑对流换热,凝固过程热传导占主导;使用肋片、相变胶囊等,主要增大相变材料接触面与蓄热体的比值,进而改善传热;蓄热材料添加高导热物质,可以改善相变材料的团聚、结核及使用寿命,从而提高导热性能,其中添加泡沫金属效果最为显著。

Advances in Strengthening Solar Phase Change Heat Storage Technology

In order to solve the intermittent problem of solar energy, it is often combined with phase change heat storage technology. Compared with traditional sensible heat storage, phase change heat storage can increase the heat storage energy several times or more, which has great research and application value. In this paper, the heat transfer mechanism of phase change heat storage and research methods in strengthening solar phase change heat storage technology were summarized and analyzed, such as transforming heat storage structure, adding ribs, using phase change capsules, filling multiphase change materials, adding high thermal conductivity materials to the heat storage material and so on. Results showed as follows: in the phase change heat transfer mechanism, the melting process mainly considered convective heat transfer, and the heat transfer in the solidification process was dominant; the use of ribs, phase change capsules, etc., mainly increased the ratio of the phase change material contact surface to the heat storage body, thereby improved heat transfer; the addition of high thermal conductivity material to the heat storage material can improve the agglomeration, tuberculosis and service life of the phase change material, thereby improved the thermal conductivity, and the effect of adding the foam metal was most remarkable.