Testing and Simulations of Spatial and Temporal Temperature Variations in a Particle-Based Thermal Energy Storage Bin

J. Sment, Mario J. Martinez, Kevin Albrecht, C. Ho
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引用次数: 1

Abstract

The National Solar Thermal Test Facility (NSTTF) at Sandia National Laboratories is conducting research on a Generation 3 Particle Pilot Plant (G3P3) that uses falling sandlike particles as the heat transfer medium. The system will include a thermal energy storage (TES) bin with a capacity of 6 MWht¬ requiring ∼120,000 kg of flowing particles. Testing and modeling were conducted to develop a validated modeling tool to understand temporal and spatial temperature distributions within the storage bin as it charges and discharges. Flow and energy transport in funnel-flow was modeled using volume averaged conservation equations coupled with level set interface tracking equations that prescribe the dynamic geometry of particle flow within the storage bin. A thin layer of particles on top of the particle bed was allowed to flow toward the center and into the flow channel above the outlet. Model results were validated using particle discharge temperatures taken from thermocouples mounted throughout a small steel bin. The model was then used to predict heat loss during charging, storing, and discharging operational modes at the G3P3 scale. Comparative results from the modeling and testing of the small bin indicate that the model captures many of the salient features of the transient particle outlet temperature over time.
基于粒子的储热仓中温度时空变化的测试与模拟
桑迪亚国家实验室的国家太阳能热测试设施(NSTTF)正在进行第三代颗粒中试工厂(G3P3)的研究,该工厂使用落沙状颗粒作为传热介质。该系统将包括一个容量为6兆瓦的热能储存(TES)箱,需要约120,000公斤的流动颗粒。通过测试和建模,开发了一种经过验证的建模工具,以了解储罐充电和放电时的时空温度分布。利用体积平均守恒方程和水平集界面跟踪方程对漏斗流中的流动和能量输运进行了建模,这些方程规定了储存仓内颗粒流动的动态几何形状。允许颗粒床顶部的薄层颗粒流向中心并进入出口上方的流道。模型结果通过安装在小钢仓中的热电偶的颗粒放电温度进行验证。然后,该模型用于预测G3P3规模下充电、存储和放电操作模式下的热损失。小料仓的建模和测试结果的对比表明,该模型捕捉了瞬态颗粒出口温度随时间变化的许多显著特征。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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