分层取热对大规模蓄热水池热分层影响的实验研究  

EXPERIMENTAL STUDY ON EFFECT OF STRATIFIED DISCHARGE ON THERMAL STRATIFICATION IN LARGE-PIT THERMAL ENERGY STORAGE

作　　者：贾尚东 陈耀文[1,2] 王登甲 高萌[3] 刘艳峰 范思琴 Jia Shangdong;Chen Yaowen;Wang Dengjia;Gao Meng;Liu Yanfeng;Fan Siqin(School of Building Services Science and Engineering,Xi’an 710055,China;State Key Laboratory of Green Building,Xi’an University of Architecture and Technology,Xi’an 710055,China;Department of Civil Engineering,Technical University of Denmark,Kgs.Lyngby DK 2800,Denmark)

机构地区：[1]西安建筑科技大学建筑设备科学与工程学院,西安710055 [2]绿色建筑全国重点实验室,西安710055 [3]丹麦技术大学土木工程学院,孔恩斯-灵比2800

出　　处：《太阳能学报》2025年第3期470-478,共9页Acta Energiae Solaris Sinica

基　　金：“十四五”国家重点研发计划(2022YFC3802705);国家自然科学基金青年项目(52108094)。

摘　　要：搭建蓄热水池分层取热缩尺实验平台,通过实验方法研究分层取热对水体温度场的影响,利用出口温度、混合数(Nmix)、理查森数(Ri)等评价参数对实验结果进行定量化分析。研究结果表明:取水口越靠近蓄热水池顶部,水体各层温度和取热温度降低趋势越明显,Nmix增大得越快,水体的热分层程度减小得越快。取热过程中蓄热水体Ri主要取决于进出口流量,取水口位置对其影响较小;当取水口位于水池体积中位线以上时,取热效率随取热时间不断增加,且布水器越靠近顶部,取热效率增加得越快;在取水口位置固定的情况下,随着流量的增大,水池各层温度、取热温度、Nmix、取热效率变化得越快,且取水口越靠近顶部,水体热分层程度受流量影响越大;取热时,取水流量的变化相比于取水口高度的变化对蓄热水体的热分层状态的影响更大。In this paper,a scale model experimental platform was built to research the effect of the stratified discharge on the thermal stratification by combining the evaluation methods of outlet temperature,Nmix number,and Ri number.The results show that the closer the outlet is to the top of the thermal storage tank,the more obvious the decreasing trend of the water temperature and outlet temperature is,the thinner the thermocline is,and the Nmix number increases faster,indicating that the degree of thermal stratification of the water body decreases.The Ri number is mostly determined by volume flow rates,and the position of the outlets has little bearing on it.The discharge efficiency increases with time when the outlet is located above the middle line of the pool volume.With fixed outlet positions,as flow rate increases,the water temperature,Nmix number,and discharge efficiency vary faster,and the closer the outlet is to the top,the more the volume flow rates affect the thermal stratification of the water body.The change in volume flow rates affects thermal stratification more than the change in outlet height.

关 键 词：太阳能 储热 热分层 取热 蓄热水池 缩尺实验 

分 类 号：TK513.5[动力工程及工程热物理—热能工程]