直通式真空管空气集热器热性能实验及干燥应用

在直通式太阳能玻璃真空管空气集热器基础上改进联箱结构,并搭建测试平台对该种改进型空气集热器进行热性能实验研究。通过实验比较改进前后集热器的温升和效率,获得改进后集热器出口温度与太阳辐照度关系的线性回归方程,掌握不同空气质量流量对集热器出口温度和集热效率的影响规律,分析得到该种真空管的最佳串联个数,并对应用该种集热器的太阳能干燥系统的干燥效果进行初步测试分析。该研究结果可为太阳能空气集热干燥系统的设计及应用提供参考。

EXPERIMENTAL STUDYON DIRECT PASS All-GLASS EVACUATED TUBULAR SOLAR AIR COLLECTORAND DRYING APPLICATION

The conventional direct pass all-glass evacuated tubular solar air collector is improved,and an experimental test platform is set up to investigate the thermal performance of this kind of solar air collector. The temperature raising process and the efficiency condition of the improved collectors are contrasted with the former one. A linear fitted curves is completed according to the experimental data,which shows the relationship between the outlet temperature of the new kind of collector and the solar irradiance. The interrelationship among the mass flow,the outlet temperature of collector and the thermal efficiency has been analyzed. And the number of evacuated tube series has been optimized as well. Finally,a solar drying system using the new kind of solar air collectors is built,which is tested and analyzed preliminarily. The results of this paper can provide some reference and help for designing of a solar drying system.