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Starting up a practical natural draft cooling system: Experimental and theoretical study on transients
International Communications in Heat and Mass Transfer ( IF 7 ) Pub Date : 2021-06-28 , DOI: 10.1016/j.icheatmasstransfer.2021.105444
Peixin Dong , Xiaoxiao Li , Zhiqiang Guan , Hal Gurgenci , Liang Zhang , Junjie Feng

The transients of a practical natural draft cooling system at The University of Queensland are experimentally studied under windless and strong crosswind conditions, with a constant heat input. The experimental start-up performance of the cooling system is analyzed both globally and locally under windless conditions in four stages, including stagnation (~70 s), plume-dominant (~280 s), draft-dominant (~1000 s) and overshoot (~400 s). With a high-speed crosswind (~8 m/s), the duration can be effectively shortened by at least 15%. Based on an existing thermodynamic model, an improved 1D theoretical model is then derived to predict the start-up of the cooling system. The model consists of plume-dominant and draft-dominant components. The improved 1D model is able to predict the transient start-up process under windless conditions with less than 10% error. Finally, factors affecting the start-up process of the experimental cooling system, such as the mass flow rate of the circulating water and input heating rate, are discussed. A decreased water mass flow rate from the design-point to the half value extends the start-up duration by a factor of 1.2. A similar impact on the start-up process is witnessed with a decreased input heat.



中文翻译:

启动了一个实用的自然通风冷却系统:实验和理论研究上的瞬变

在昆士兰大学实际冷却系统的自然通风的瞬态下无风和强侧风条件下进行了实验研究,以恒定的热输入。所述冷却系统的实验启动性能分析在全球和本地无风的条件下,在四个阶段,包括停滞(〜70秒),羽显性(〜280个S),草案显性(〜1000秒)和过冲(〜400秒)。在高速侧风 (~8 m/s) 下,持续时间可以有效缩短至少 15%。基于现有的热力学模型,改进的1D理论模型,然后导出预测起动时的冷却系统的。该模型由羽显性和草案主导成分。改进后的一维模型能够预测具有小于10%的误差无风的条件下,瞬时启动过程。最后,讨论了影响实验冷却系统启动过程的因素,如循环水的质量流量和输入加热速率。从设计点到半值的降低的水质量流量将启动持续时间延长了 1.2 倍。在启动过程中的类似冲击目睹具有减小的输入热量。

更新日期:2021-06-28
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