摘要
微通道换热器具有换热性能好、结构紧凑的优点,但在换热器中,熔盐侧的流动换热性能较差。为解决上述问题,运用场协同原理对翼型微通道熔盐换热器进行强化,并对其进行数值分析。该文以60%硝酸钠和40%硝酸钾混合而成的二元硝酸盐(太阳盐,Solar Salt)作为热侧流体,计算出局部场协同角分布,分析入口流速和入口温度对速度场和温度场场协同性的影响,并对局部场协同性较差的位置进行强化。结果表明,入口流量在0.005~0.013 kg/s(Re=2810-7307)范围内,翼型微通道换热器的场协同性随入口流量和入口温度的增加而变差。强化后的换热器其熔盐侧全场场协同角下降约3.73°,综合换热性能(PEC)提升2.25%。
Microchannel heat exchanger has many advantages such as good heat transfer performance and compact structure.However,the flow and heat transfer performance of the molten salt side of the heat exchanger is poor.In order to improve the flow and heat transfer performance of the molten salt side,the airfoil microchannel molten salt heat exchanger is strengthened and numerically analyzed based on the field synergy principle.In this contribution,the binary nitrate(Solar Salt),which is a mixture of 60%sodium nitrate and 40%potassium nitrate,is used as the hot side fluid.Firstly,the local field synergy angle distribution is calculated.Then,the effects of the inlet flow velocity and the inlet temperature on the field synergy are analyzed.Finally,the positions with poor local field synergy angle are strengthened.The results show that when the inlet flow rate is in the range of 0.005-0.013 kg/s(Re=2810-7307),the field synergy angle of airfoil microchannel heat exchanger increases with the increase of inlet flow rate and inlet temperature.The whole field synergy angle of the enhanced heat exchanger decreases by 3.73°and the PEC increases by 2.25%.
作者
刘赟
张传智
董月
Liu Yun;Zhang Chuanzhi;Dong Yue(Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology,School of Energy,Power and Mechanical Engineering,North China Electric Power University,Baoding 071003,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2023年第3期509-515,共7页
Acta Energiae Solaris Sinica
基金
河北省自然科学基金(E2020502021)
中央高校基本科研业务费面上项目(2020MS106)。
关键词
太阳能热发电
熔融盐
数值模拟
微通道换热器
场协同原理
强化传热
solar thermal power
molten salts
numerical simulation
microchannel heat exchanger
field synergy principle
heat transfer enhancement
