太阳能蓄热分层水箱数值模拟优化分析  

Numerical simulation optimization analysis of solar thermal storage layered water tank

作　　者：程友良[1] 王敬双[1] 刘萌 李卫华[1] Cheng Youliang;Wang Jingshuang;Liu Meng;Li Weihua(School of Energy Power and Mechanical Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学能源动力与机械工程学院

出　　处：《可再生能源》2019年第10期1448-1452,共5页Renewable Energy Resources

基　　金：中央高校基本科研业务费专项资金项目(2017MS121)

摘　　要：蓄热水箱能够存储和调配能量。将蓄热水箱应用到太阳能热水系统中,可以弥补太阳能的不稳定性和不连续性,有效地提高太阳能热水系统的热利用率。文章基于小型太阳能热水系统,建立蓄热水箱物理模型,应用Fluent软件模拟分析了各个工况下蓄热水箱的温度分层情况,从而寻求较优的温度分层。分析结果表明:当热水入口质量流量小于2.8 kg/s时,蓄热水箱的温度分层比较明显;当热水入口质量流量大于2.8 kg/s时,随着热水入口质量流量逐渐增大,蓄热水箱温度分层越来越不明显;热水入口温度与水箱初始温度对于蓄热水箱温度分层影响不大;当热水入口质量流量为2.8 kg/s时,存在最佳热水入口直径(9 mm),此时蓄热水箱冷、热水不发生混合,蓄热水箱的热利用率较高。The hot water storage tank has the functions of storing energy and adjusting energy.Applying the hot water storage tank to the solar water heating system can reduce the instability and discontinuity of the solar energy and effectively improve the heat utilization rate of the solar water heating system.Based on a small solar water heating system,the physical model of hot water storage tank was established,and the Fluent software is used to simulate the temperature stratification of the hot water storage tank in different conditions in order to seek a better temperature stratification.The analysis results show that when the mass flow rate of hot water inlet is below 2.8 kg/s,the temperature stratification is more obvious.After the mass flow rate exceeds2.8 kg/s,as the mass flow rate of the hot water inlet gradually increases,the temperature stratification of the hot water storage tank becomes less obvious.The hot water inlet temperature and the initial temperature of the water tank have little influence on the temperature stratification of the heat storage tank.When the inlet mass flow rate is 2.8 kg/s,there is an optimum hot water inlet diameter of 9 mm,when the hot and cold water in the hot water storage tank do not mix and the heat utilization rate of the water tank is higher.

关 键 词：太阳能 蓄热水箱 温度分层 数值模拟 

分 类 号：TK513.5[动力工程及工程热物理—热能工程]