太阳能光催化-导光管将太阳光导入的同时兼具光催化空气净化功能。导光管的长度为0.55 m, 直径为0.28 m, 导光管内表面的平均反射比为0.82。散光板的直径为0.28 m, 为雪花型散光板, 将光催化剂 DegussaP25溶液均匀地喷涂在散光板凹凸不平的一侧, 附着在散光板上的DegussaP25质量为1.75 g。实验表明, 涂层背对太阳时散光板下的照度比无涂层的散光板下的照度有一定程度的减弱, 但是减弱的幅度并不大, 平均降幅只有3.03%, 因此不会对室内采光产生明显影响。实验表明, 夏季晴天上午太阳直射下, 太阳能光催化-导光管能够使0.1 m3小室内甲醛体积分数从1.0×10-6下降到0.19×10-6。中午太阳直射下1 h之内甲醛体积分数从1.0×10-6下降到0.17×10-6; 比上午的降解速度加快, 降解甲醛更为完全; 下午太阳直射下甲醛降解, 1 h之内, 甲醛体积分数从1.0×10-6下降到0.2×10-6, 降解速度比上午、中午都慢, 但也达到了良好的降解效果。

Solar light pipe combined with photocatalysis could introduce sunlight into rooms and also has air purification function. The length of the solar light pipe is 0.55 m with a diameter of 0.28 m. The average ratio of reflection of the surface of solar light pipe is 0.82. Snow shaped astigmatism board has a diameter of 0.28 m. Coating DegussaP25 solution evenly on the rugged side for the quality of 1.75 g. The experiments show that when the coating side away from the sun the lighting degree may be reduced compared with when facing the sun. But the average reduction was only 3.03 percent which would not have a significant impact on indoor lighting. The experiments also show that in a sunny summer morning under the direct sun, Solar light pipe combined with photocatalysis could reduce formaldehyde in a little box of 0.1 m3 volume from 1.0×10-6 to 0.19×10-6. Under the direct noon sun within 1h formaldehyde volume from 1.0×10-6 down to 0.17×10-6 with faster and more complete degradation of formaldehyde. In direct afternoon sun within 1 hour, the volume fraction of formaldehyde reduced from 1.0×10-6 down to 0.2×10-6. The rate of degradation in the afternoon was slower than that in the morning and noon, but also achieved a good performance.