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为了有效提高太阳能的热利用率,本文运用对流换热场协同理论对太阳集热墙通道中的气流速度场和温度场进行了研究,探讨了通道内温度梯度的方向和气流速度比(u/v)对场协同角及对流换热贡献率的影响规律。研究得出:太阳集热墙通道中的场协同性主要取决于集热墙板的形状和通道中气流的输运工况,改善集热墙板的形状可形成有益于对流换热的温度梯度方向角(θ);当θ一定时(θ≠0°),随着气流速度比的增加,对换热的贡献亦增加,且θ越大,效果越明显。由此提出了优化太阳集热墙集热板的思路,设计了一种带孔折型集热板的太阳墙系统并进行了实验验证。
In order to effectively improve the thermal efficiency of solar energy, the convection heat field synergy theory is used to study the velocity field and temperature field in the solar collector wall channel, and the relationship between the temperature gradient and the velocity ratio (u / v) The influence law on the field synergy angle and the contribution rate of convection heat transfer. The research shows that the field synergy in the solar collector wall channel mainly depends on the shape of the collector wall plate and the transport condition of the airflow in the channel. Improving the shape of the collector wall plate can form a temperature gradient that is conducive to convection heat transfer When θ is constant (θ ≠ 0 °), the contribution to heat transfer also increases with the increase of air velocity velocity ratio, and the greater θ is, the more obvious the effect is. Therefore, the idea of optimizing solar collector wall heat collector is proposed, and a solar wall system with aperture folded collector plate is designed and verified.