Na2CO3·10H2O蓄热材料厚度对太阳能被动通风效应的影响

摘要

通过对不同厚度(10 mm,15 mm,20 mm)的Na2CO3·10H2O蓄热材料的太阳能混合墙体在830W辐射能量照射下的烟囱效应进行试验,讨论并分析在Na2CO3·10H2O蓄热效应作用下,蓄热材料厚度对蓄热材料两侧温度、烟囱通道出口温度和速度的影响及其对烟囱所诱导的自然通风量的影响.试验结果表明,通道出口空气温度、平均风速以及质量流量均在加热开始后短时间内(大约1 h)升高到某一值继而趋于稳定;蓄热材料厚度越大,空气温度、质量流量以及平均风速均越大;加热停止后,通道内能维持一定空气温度、质量流量以及平均风速,这表明蓄热材料可以有效延长自然通风的时间.%The chimney effect is tested on the solar hybrid wall of Na2CO3 · 10H2O heat storage meterial of different thickness (10 mm,15 mm and 20 mm) under the radiation exposure of 830 W.Under the heat storage effect of Na2CO3 · 10H2O,the effect of heat storage material thickness on the temperature beside the heat storage material layer,the outlet temperature and velocity of the air in the chimney channel,and the natural ventilation mass flow resulted from the chimney effect are discussed and analyzed.The test results show that the temperature,the velocity and the mass flow of the channel's outlet air can increase quickly to the max value in about one hour after heating and tend to be stable.With the increase of heat storage material's thickness,the air temperature,the air mass flow and the air velocity will also be improved.When the heating equipment is closed,the air temperature,the air mass flow and the air velocity still can be maintained,which means that the heat storage material can prolong the time of the natural ventilation.