Transient three-dimensional CFD modelling of ceiling fans

天花板(云) 计算流体力学 热舒适性 空调 湍流 瞬态(计算机编程) 环境科学 气流 热的 海洋工程 气象学 模拟 工程类 计算机科学 机械工程 结构工程 航空航天工程 物理 操作系统
作者
Francesco Babich,Malcolm Cook,D.L. Loveday,Rajan Rawal,Yash Shukla
出处
期刊:Building and Environment [Elsevier BV]
卷期号:123: 37-49 被引量:58
标识
DOI:10.1016/j.buildenv.2017.06.039
摘要

Ceiling fans have been used for decades as a means of providing thermal comfort in tropical countries such as India. However, recent years have witnessed a significant increase in the use of air conditioning as a means to achieve comfort, and therefore in the total energy consumption and related CO2 emissions. Ceiling fans are still viable options to limit use of air conditioners or in combination with air conditioners without compromising on thermal comfort and still achieving energy savings. Ceiling fans generate non-uniform velocity profiles, and therefore relatively non-uniform thermal environments, whose characteristics may be tough to analyse with simple modelling methods. This issue can be investigated using CFD. However, to date, there are few works on ceiling fans, CFD and thermal comfort. More accurate models are therefore required to predict their performance. The research presented in this paper aimed to develop and validate a three-dimensional transient implicit CFD model of a typical ceiling fan available in India by comparing simulation results obtained using different URANS turbulence models with measured data collected in controlled environment. The results highlight that this ceiling fan model is able to replicate the predominant characteristics of the air flow generated by the fan such as the meandering plume and the local fine free shear layers. The best results are achieved when the SST k-ω turbulence model is used, with 83% of the simulated values being within the error bars of the respective measured value.
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