Experimental investigation of a latent heat thermal energy storage unit encapsulated with molten salt/metal foam composite seeded with nanoparticles  

作　　者：Xin Xiao Hongwei Jia Dongsheng Wen Yousef Golizadeh Akhlaghi Ali Badiei 

机构地区：[1]School of Environmental Science and Engineering,Donghua University,Shanghai,201620,China [2]School of Chemical and Process Engineering,University of Leeds,Leeds,LS29JT,UK [3]Shanghai Institute of Pollution Control and Ecological Security,Shanghai,200092,China [4]EPSRC National Centre,School of Engineering,Newcastle University,Newcastle,NE45TG,UK [5]School of Engineering,University of Central Lancashire,Preston,PR12HE,UK

出　　处：《Energy and Built Environment》2023年第1期74-85,共12页能源与人工环境（英文）

基　　金：This research has received funding from the Shanghai Pujiang Pro-gram(No.20PJ1400200);the Shanghai overseas high level Talents Pro-gram,the Fundamental Research Funds for the Central Universities of China(No.2232021D-11&2232018D3-37);European Union’s Horizon 2020 research and Innovation Programme under the Marie Sklodowska-Curie grant(No.706788);the Natural Science Foundation of China(No.52006030).The authors would like to extend their acknowledge-ment to Dr.Afrah Awad and Mr.Hailong Ma for the kind help.

摘　　要：Molten salt has been widely used in latent heat thermal energy storage(LHTES)system,which can be incorporated into hybrid photovoltaic/thermal solar system to accommodate the built environment.Solar salt(60 wt.%NaNO 3 and 40 wt.%KNO 3)was employed as the phase change materials(PCMs)in this study,and both aluminum oxide(Al_(2)O_(3))nanopowder and metal foam were used to improve the properties of pure solar salt.The synthesis of the salt/metal foam composites seeded with Al_(2)O_(3)nanopowder were performed with the two-step and impregnation methods,and the composite PCMs were characterized morphologically and thermally.Then pure solar salt,the salt/2 wt.%Al_(2)O_(3)nanopowder and salt/copper foam composite seeded with 2 wt.%Al_(2)O_(3)nanopowder were encapsulated in a pilot test rig,respectively,where a heater of 380.0 W was located in the center of the LHTES unit.The charging and discharging processes of the LHTES unit were conducted extensively,whereas the heating temperatures were controlled at 240℃,260℃and 280℃respectively.Temperature evolutions at radial,angular and axial positions were recorded,and the time-durations and volumetric mean powers during the charging and discharging processes were obtained and calculated subsequently.The results show that physical bonding between Al_(2)O_(3)nanopowder and nitrate molecule has been formed from the morphological pictures together with XRD and FTIR curves.Slight changes are found between the melting/freezing phase change temperatures of the salt/metal foam composites seeded with Al_(2)O_(3)nanopowder and those of pure solar salt,and the specific heats of the salt/Al_(2)O_(3)nanopowder composite slightly increase with the addition of Al_(2)O_(3)nanopowder.The time-duration of the charging process for the salt/copper foam composite seeded with Al_(2)O_(3)nanopowder at the heating temperature of 240℃can be reduced by about 74.0%,compared to that of pure solar salt,indicating that the heat transfer characteristics of the LHTES unit encapsulated with the salt/co

关 键 词：Solar salt Aluminium oxide nanopowder Metal foam Heat transfer characteristics 

分 类 号：TU564[建筑科学—建筑技术科学] TU531.1