Cyclic thermal performance analysis of a traditional Single-Layered and of a novel Multi-Layered Packed-Bed molten salt Thermocline Tank

RENEWABLE ENERGY

卷:118

Article

Li, Meng-Jie¹  Qiu, Yu¹  Li, Ming-Jia¹ 

[1] Xi An Jiao Tong Univ, Sch Energy & Power Engn, Minist Educ, Key Lab Thermofluid Sci & Engn, Xian 710049, Shaanxi, Peoples R China

关键词: Packed-Bed;    Thermocline;    Thermal energy storage;    Solar energy;    Cyclic process;    Novel Multi-Layered Packed-Bed;   

DOI  :  10.1016/j.renene.2017.11.038

来源: Elsevier

【 摘 要 】

In the study, a transient, two-dimensional and axisymmetric model of the packed-bed thermocline tank is developed. Based on the model, the cyclic thermal performance of a traditional Single-Layered and of a novel Multi-Layered Packed-Bed molten salt Thermocline Tank (SLPBTT, MLPBTT) are analyzed. First, the analysis of cyclic thermal performance of SLPBTT shows the performance can be enhanced by reducing the retention thermocline thickness. Second, this is the first time for a detailed investigation of the expanding and the shortening effects on thermocline thickness at the interface between two kinds of filler. In addition, a novel MLPBTT is designed utilizing the above interface effects for improving the performance by controlling thermocline expansion. Finally, the studies on the performance of MLPBITs adopting three fillers (quartzite rock, cast iron, and high-temperature concrete) with different heights present that the useful energy can be increased while thermal efficiency will be reduced with the increasing cast iron's height. An optimized MLPBTT shows a significant improvement in the useful energy of 10.5% and a small drop in thermal efficiency of 2.1% in discharging process compared With those of SLPBTT using the quartzite rock. The results can be beneficial for the design and optimization of PBTT. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free