化工学报 ›› 2012, Vol. 63 ›› Issue (8): 2405-2410.DOI: 10.3969/j.issn.0438-1157.2012.08.010

• 流体力学与传递现象 • 上一篇    下一篇

竖壁自储水式蒸馏器空腔自然对流换热及产水特性

谢果,郑宏飞,熊建银   

  1. 北京理工大学机械与车辆工程学院,国家新能源工程中心,北京 100081
  • 收稿日期:2011-12-23 修回日期:2012-05-24 出版日期:2012-08-05 发布日期:2012-08-05
  • 通讯作者: 郑宏飞

Natural convection heat transfer and fresh water yield in vertical plate cavity with film evaporation and raw water reservoir

XIE Guo,ZHENG Hongfei,XIONG Jianyin   

  • Received:2011-12-23 Revised:2012-05-24 Online:2012-08-05 Published:2012-08-05

关键词: 竖壁, 蒸馏器, 太阳能, 经验关系式

Abstract: A triple-effect regeneration solar distiller with raw water reservoir is designed and its operation principle is introduced.Experiments with different heating power were carried out with chrome steel strip heater for 6.5 h.In each stage,the temperature and fresh water yield of distiller were measured.The total fresh water yield of each stage in one day and the relation between evaporation rate per unit area and temperature in the vertical distiller were obtained.The experimental results with constant heating power shows that the performance ratio of the evaporation can reach 1.81 with 600 W heating power and its optimal heating energy per day is about 14 MJ.Therefore,it is suggested the area of matched solar collector is 1.5 m2 when the equipment is operated in general weather.A theoretical model is proposed in this study,which can be used for natural convection heat and mass transfer with film evaporation and raw water reservoir inside the vertical cavity.An empirical formula between Nusselt number and Rayleigh number is obtained,which is suitable for calculation of vertical plate cavity with film evaporation and raw water reservoir.

Key words: vertical plate, distiller, solar energy, empirical formula

中图分类号: