不同蓄热方式下太阳能烟囱的温升性能

TEMPERATURE RISE PERFORMANCE IN SOLAR CHIMNEYES WITH DIFFERENT HEAT STORAGES

针对太阳能烟囱的不同应用背景,设计不同蓄热方式的实验系统,考察太阳能烟囱内部的温度分布及温升性能。实验结果表明,密闭水体的蓄热方式的温升最大,由于水分蒸发消耗了部分太阳热量,开放水体系统的温升效果最差,多孔材料的加入使集热后的空气温度进一步降低;非蒸发体系中的空气温度沿着主体流动方向存在最大值,蒸发体系中的空气温度分布总体呈上升趋势,但具体变化会因水分蒸发的强弱而不同。温度分布的结果表明为了避免出现集热棚下的热量散失段,需要对太阳能烟囱的结构参数进行优化设计。

Aiming at different application fields, experimental solar chimney systems with different heat storage styles were set up. The results showed that the temperature difference in the sealed water system is the largest, while the open water system has the lowest one because of the latent heat consumed by water evaporation, the evaporation can be enhanced by porous materials with lower temperature increase, and there is a maximum data of temperature in non-evaporate systems with the air flow direction to the chimney. The temperature rises wholly with specific changes depending on the evaporation extent in the system having evaporation. The experimental results indicated there is the temperature distribution optimization of the system if the heat loss part of the collector to be avoided.