导流片对真空管输运性能影响的实验研究  

EXPERIMENTAL INVESTIGATION OF THE INFLUENCE OF THE DEFLECTOR ON THE VACUUM TUBE TRANSPORT PROPERTIES

作　　者：焦冬生[1] 何立群[1] 张海峰[1] 袁小平[1] 

机构地区：[1]中国科学技术大学热科学和能源工程系,合肥230026

出　　处：《太阳能学报》2015年第1期185-189,共5页Acta Energiae Solaris Sinica

基　　金：中科院太阳能行动计划-太阳能在建筑应用中的新技术研究和集成示范一期(2009-2012)

摘　　要：导流片沿真空管轴平面布置，形成U形通道，改善管内流体流动状态，提高自然对流换热。实验结果表明：当水的出口温度约37℃时，无导流片的真空管内水温开始出现波动；而这种水温波动，只是当水的出口温度接近50℃时，才出现在布置导流片的真空管内。对于布置导流片的真空管，水的进m口温差约为5℃，而对于无导流片的真空管，则约为3℃。导流片的安置，可将真空管集热器的效率提高10％-14％。A deflector was laid in vacuum tube, forming a U-shaped channel to improve the natural convection in the tube. The experimental results showed that when the outlet water temperature is about 37℃, the water temperature in the ordinary vacuum tube begin to fluctuate; while this temperature fluctuation occurs in the tube with deflector merely when the outlet temperature is close to 50℃. The inlet-outlet temperature difference of the vacuum tube with a deflector is about 5℃, but for the ordinary vacuum, it is about 3℃. The deflector increases the efficiency of the vacuum collector of about 10%-14%.

关 键 词：全玻璃真空管 太阳能 导流片 热效率 

分 类 号：TK515[动力工程及工程热物理—热能工程]