扰流板太阳能空气集热器的流道优化

Optimization of flow path for the spoiler solar air collector

通过改变常规的蛇形流道的扰流板式太阳能空气集热器的扰流板布置,开发出一种涡旋形流道太阳能空气集热器,并对其进行实验与模拟研究。研究发现在平均太阳辐照度819.7W/m^2、温度7.33℃、流量0.025kg/s的条件下,涡旋形太阳能空气集热器的集热效率可达59.14%,比蛇形太阳能空气集热器高2.18%;而其压力损失仅为蛇形太阳能空气集热器的37.26%,且随着流量的增加,压损降低更加明显;同时得到在出口温度为30～90℃范围内,涡旋形太阳能空气集热器的热损系数在4.6～5.6W/(m^2·K)之间,热迁移因子在0.64～0.72之间,二者的平均值各自较蛇形太阳能空气集热器高0.06W/(m^2·K)与0.019。与蛇形太阳能空气集热器相比,涡旋形的太阳能空气集热器增加了太阳能空气集热器的集热效率,同时大幅降低压力损失。

By changing the layout of spoiler plates of the solar-air collector with serpentine flow channel, a spiral solar air collector was developed with numerical and experimental studying. The results showed that under the conditions of the average solar irradiance, temperature and flow rate being 819.7W/m2, 7.33℃ and 0.025kg/s respectively, the heat-collecting efficiency of the solar air collector could reach 59.14%, which was 2.18% higher than that of the serpentine solar air collector. The pressure loss for spiral one was only 37.26% of the pressure for serpentine solar collector, and the pressure loss decreased significantly with the increase of flow rate. The heat loss coefficient of the spiral solar air collector was in the range of 4.6-5.6W/(m^2·K) and the heat transfer factor was between 0.64-0.72 in the temperature range of 30-90℃. The average value of the two was 0.06W/(m^2·K) or 0.019 respectively higher than those of the snake solar air collector. Compared with serpentine solar air collector, the spiral solar-air collector increases the heat collection efficiency of the solar air collector and greatly reduces the pressure loss.