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The effects of ventilation and floor heating systems on the dispersion and deposition of fine particles in an enclosed environment

机译：通风和地板采暖系统对封闭环境中细颗粒的分散和沉积的影响

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Recent years, most cities in China suffer from ambient particulate matter pollution, especially in winter. The absence of fresh air system in most northern heating buildings in winter results in the poor indoor air quality. This work aims to deal with the particle dispersion in a ventilated and floor-heated indoor environment by using experimental measurements and computational fluid dynamics (CFD) methods. Two ventilation systems were considered, i.e., top & down supply. Firstly, experiments were conducted to validate the velocity and particle concentrations by CFD simulation. Secondly, unsteady particles (with the diameter of 1 Jim) dispersion was simulated with different inlet velocities (i.e., 0.3, 0.4 and 0.5 m/s) and floor temperatures (i.e., 293, 298, 303 and 308 K) in a ventilated and floor-heated chamber. Lagrangian method was employed for particles tracking. It is found that the higher the inlet velocity, the faster particle concentration decayed. For the same inlet velocity, particles in the chamber were removed faster with the increase of floor temperature. When the inlet velocity was 0.5 m/s and the floor temperatures were 293 and 308 K, it took 391s and 200s respectively for normalized concentration decreasing to 0.1. The number of particles deposited on the floor decreased with the increase of the inlet velocity and the floor temperature. This study also identifies that when the floor temperature was 308 K, the removing time is reduced by 15% for normalized particle concentration with the down-supply ventilation mode. These findings would be facilitating for the future design of ventilation and heating systems. (C) 2017 Elsevier Ltd. All rights reserved.
机译：近年来，中国大多数城市都受到环境颗粒物污染的困扰，尤其是在冬天。冬季，大多数北方供热建筑物中都没有新鲜空气系统，导致室内空气质量差。这项工作旨在通过使用实验测量和计算流体力学（CFD）方法来处理通风和地板加热的室内环境中的颗粒分散。考虑了两个通风系统，即上下供气。首先，进行了实验以通过CFD模拟验证速度和粒子浓度。其次，在通风和通风条件下，以不同的入口速度（即0.3、0.4和0.5 m / s）和地板温度（即293、298、303和308 K）模拟不稳定颗粒（直径为1 Jim）的分散体。地板加热室。拉格朗日法用于粒子跟踪。发现入口速度越高，颗粒浓度衰减越快。对于相同的入口速度，随着底板温度的升高，腔室内的颗粒被更快地清除。当入口速度为0.5 m / s且地板温度为293和308 K时，归一化浓度降至0.1分别花费了391s和200s。随着入口速度和地板温度的增加，沉积在地板上的颗粒数量减少。这项研究还发现，当地板温度为308 K时，采用向下供气通风模式时，归一化颗粒浓度的去除时间减少了15％。这些发现将为将来的通风和供热系统设计提供便利。 （C）2017 Elsevier Ltd.保留所有权利。

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