摘要
文章对矩形太阳能蓄热水箱在保温过程中的温度场进行了数值计算,并对水箱内部流体出现的温度分层现象进行了试验研究。数值计算和试验结果表明:矩形水箱在蓄热结束后,其内部流体已经形成一定的温度梯度;在38h试验时间内,水箱中下部温度分层良好,即水箱内部流体各测点温度均没有出现较大的温度波动,基本呈线性下降趋势。壁面的对流换热以及顶部检修口的漏热,是水箱内部流体温度分层现象产生的主要原因。依据试验数据并结合工程实际,该文提出了太阳能蓄热循环温差设置的改进方式。
The experiments on thermal stratification of rectangular solar heat storage water tank werecarried out, and the reasons for internal thermal stratification in the tank were analyzed by numericalcalculation. The results show that the internal fluid in the rectangular tank led to certain thermalstratification at the end of solar thermal storage. During the 38 hours of experiment, the temperaturein the middle and lower part of the tank stratified well. Temperatures at each measuring point did notfluctuate wildly, basically descending linearly. However, the heat convection of the walls and the heatleakage had effect on the thermal stratification of the internal fluid. An improved method of setting upthe cyclic temperature difference for the solar regenerative system was proposed based on the analysisof the experimental data and practical condition of engineering.
出处
《合肥工业大学学报（自然科学版）》
CAS
北大核心
2017年第8期1026-1030,共5页
Journal of Hefei University of Technology：Natural Science
基金
合肥工业大学产学研校企合作资助项目(K-GD2014-0767)
合肥工业大学博士学位专项基金资助项目(JZ2016HGBZ0748)
关键词
数值计算
试验
矩形水箱
温度分层
漏热
numerical calculation
experiment
rectangular water tank
thermal stratification
heat leakage
