Thermal performance of a single-layer packed metal pebble-bed exposed to high energy fluxes

doi:10.1007/s11708-019-0638-7

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	Thermal performance of a single-layer packed metal pebble-bed exposed to high energy fluxes
	Zhang, Shengchun 1,2,3,4; Wang, Zhifeng 1,2,3,4; Bian, Hui 5; Huang, Pingrui 1,2,3,4
刊名	FRONTIERS IN ENERGY
	2021-06
卷号	15 期号:2 页码:513-528
关键词	packed bed solar thermal power plants high heat fluxes radiative heat transfer
ISSN号	2095-1701
DOI	10.1007/s11708-019-0638-7
英文摘要	It is difficult to accurately measure the temperature of the falling particle receiver since thermocouples may directly be exposed to the solar flux. This study analyzes the thermal performance of a packed bed receiver using large metal spheres to minimize the measurement error of particle temperature with the sphere temperature reaching more than 700 degrees C in experiments in a solar furnace and a solar simulator. The numerical models of a single sphere and multiple spheres are verified by the experiments. The multiple spheres model includes calculations of the external incidence, view factors, and heat transfer. The effects of parameters on the temperature variations of the spheres, the transient thermal efficiency, and the temperature uniformity are investigated, such as the ambient temperature, particle thermal conductivity, energy flux, sphere diameter, and sphere emissivity. When the convection is not considered, the results show that the sphere emissivity has a significant influence on the transient thermal efficiency and that the temperature uniformity is strongly affected by the energy flux, sphere diameter, and sphere emissivity. As the emissivity increases from 0.5 to 0.9, the transient thermal efficiency and the average temperature variance increase from 53.5% to 75.7% and from 14.3% to 27.1% at 3.9 min, respectively. The average temperature variance decreases from 29.7% to 9.3% at 2.2 min with the sphere diameter increasing from 28.57 mm to 50 mm. As the dimensionless energy flux increases from 0.8 to 1.2, the average temperature variance increases from 13.4% to 26.6% at 3.4 min.
WOS研究方向	Energy & Fuels
语种	英语
出版者	HIGHER EDUCATION PRESS
WOS记录号	WOS:000668172200020
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/148515]
专题	兰州理工大学
作者单位	1.Univ Chinese Acad Sci, Beijing 100190, Peoples R China; 2.Chinese Acad Sci, Key Lab Solar Thermal Energy & Photovolta Syst, Beijing 100190, Peoples R China; 3.Chinese Acad Sci, Inst Elect Engn, Beijing 100190, Peoples R China; 4.Beijing Engn Res Ctr Solar Thermal Power, Beijing 100190, Peoples R China; 5.Lanzhou Univ Technol, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Shengchun,Wang, Zhifeng,Bian, Hui,et al. Thermal performance of a single-layer packed metal pebble-bed exposed to high energy fluxes[J]. FRONTIERS IN ENERGY,2021,15(2):513-528.
APA	Zhang, Shengchun,Wang, Zhifeng,Bian, Hui,&Huang, Pingrui.(2021).Thermal performance of a single-layer packed metal pebble-bed exposed to high energy fluxes.FRONTIERS IN ENERGY,15(2),513-528.
MLA	Zhang, Shengchun,et al."Thermal performance of a single-layer packed metal pebble-bed exposed to high energy fluxes".FRONTIERS IN ENERGY 15.2(2021):513-528.