Numerical investigation on the influence of natural make-up air in Chinese-style residential kitchen on indoor environment in a partitioned household
Numerical investigation on the influence of natural make-up air in Chinese-style residential kitchen on indoor environment in a partitioned household
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DOI：
10.1016/j.seta.2021.101244
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发表时间：
2021-08
影响因子：
8
通讯作者：
Yu Liu;Jiankai Dong;Yu Wang;Wenke Zheng;Yiqiang Jiang
中科院分区：
文献类型：
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作者：
Yu Liu;Jiankai Dong;Yu Wang;Wenke Zheng;Yiqiang Jiang
在家庭厨房中，烹饪导致热量的产生和颗粒的扩散。由于分隔空间的非均匀空气混合，厨房与相邻房间的室内环境存在差异。然而，对烹饪对相邻房间的室内环境影响的研究还不够。目前中式住宅厨房（CRK）仍广泛使用从外部窗户开口或裂缝中自然补充的空气。本研究旨在用CRK预测室内分区环境中的气流和颗粒分布。厨房外窗的自然补充空气，包括无序、空气渗透和有序的气流。采用计算流体力学方法对相邻室内的速度、温度、颗粒浓度和气流进行了研究。结果表明：外窗补风不足时的室内整体速度量级是补风充足时的2倍；垂直方向和水平方向的速度大小差异较大，但呼吸区不同位置的速度大小差异不大。相邻房间的温差为0.5 ~ 2.2℃。在夏季条件下，在杂乱无章的补充空气中观察到高达31.8°C，这可能导致热不适。厨房窗户有组织的补充空气可以大大降低相邻房间的pm2.5质量浓度。当模型风量为810 m3/h时，室内环境模拟pm2.5质量浓度最低。适当组织补充空气量，可以大大降低浓度。但过量的补充空气可能会导致更多的颗粒从厨房扩散到邻近的房间。此外，从客厅到厨房的气流表明，污染的污染物可能从干燥的地漏传播到生活环境。
In domestic kitchen, cooking leads to heat generation and particle diffusion. Due to heterogeneous air mixing in partitioned spaces, difference of indoor environment between kitchen and adjacent room exits. However, study on indoor environment in adjacent room caused by cooking is not enough. Natural make-up air from exterior window openings or cracks are still the current widely used in Chinese-style residential kitchens (CRK). This study aims to predict airflow and particle distribution in a partitioned indoor environment with a CRK. Natural make-up air from exterior kitchen window, including disorganized, air infiltration and organized airflow were defined. Computational fluid dynamics method was applied to investigate velocity, air temperature, particle concentration and airflow in adjacent room. Results show that overall indoor velocity magnitude under insufficient make-up air from exterior window was two times than that under enough make-up air. Velocity magnitude in vertical and horizontal direction was quite different, but there was little difference in different position in breathing zone. Temperature difference in adjacent room ranged from 0.5 to 2.2 °C. Up to 31.8 °C was observed in disorganized make-up air in summer condition, which could lead to thermal discomfort. PM2.5mass concentration in adjacent room could be largely reduced by organized make-up air from kitchen window. Under air volume of 810 m3/h in the model, simulated PM2.5mass concentration in indoor environment was the lowest. With appropriate organized make-up air volume, concentration could be largely reduced. But excessive make-up air could lead to more particle diffusion from kitchen to adjacent room. Furthermore, airflow from living room to kitchen indicated a possible transmission of contaminated pollutant from dry floor drain to the living environment.