所属单位：能源与动力学院
发表刊物：INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
关键字：Volumetric solar receiver Kelvin model Surface emissivity Strut shape
摘要：The volumetric receiver is a key component in the concentrated power plant. In this work, we propose a novel porous medium structure for solar volumetric receivers by accounting for both high heat transfer features and low pressure drop, which is composed of packed strut cross shaped particles whose surface radiative property is spectrally dependent. A local thermal non-equilibrium model is established, and the effective parameters of the porous media are obtained from the Kelvin model. The effects of the pore size, porosity, wavelength related emissivity and Heywood circularity factor of the strut cross section on the heat transfer and flow in the receiver are investigated. Results show that the radiation loss of the receiver mainly depends on the first five representative elementary volumes. The efficiency increases with the porosity and Heywood circularity factor. By decreasing the infrared emissivity of the receiver, the efficiency increases about 3% compared to the receiver with constant emissivity. Finally, a hybrid dual layer receiver is introduced to improve the heat transfer and flow performance, and the efficiency enhancement of up to 4% can be achieved. (C) 2018 Elsevier Ltd. All rights reserved.
ISSN号：0017-9310
是否译文：否
发表时间：2018-07-01
合写作者：Zhu, Qibin
通讯作者：宣益民
发表时间：2018-07-01