辐射供冷住宅设计最小新风量的有效利用

Effective Use of Minimum Outdoor Air Ventilation Rate in Radiant Cooling Residential Buildings

摘要:

以低冷负荷住宅建筑为研究对象,采用计算流体动力学(CFD)方法,研究送风末端与冷吊顶结合时,最小新风量的有效利用,通过数值模拟得出了上送风、置换通风、下送风三种气流组织形式与冷吊顶相结合时室内各位置的风速、温度、相对湿度、污染物浓度等参数,对三种气流组织下的室内空气质量水平和热舒适水平进行了综合评价.研究结果表明,与冷吊顶结合时,采用置换通风和下送风形式,室内可获得更佳的室内空气品质,最小新风量可获得更有效的利用.

关键词:住宅; 辐射供冷; 最小新风量; 室内空气品质; 热舒适

Abstract:

The purpose of this paper was to investigate the effective use of the minimum outdoor air ventilation rate using computational fluid dynamics(CFD)methods in residential buildings with low cooling load,where a chilled ceiling in combination with a fresh air handling unit was adopted.Some thermal environment parameters such as air speed,temperature,relative humidity,concentration of pollutants were obtained under three kinds of air distribution such as mixing ventilation,displacement ventilation,underfloor air supply.And the comprehensive evaluation of the indoor air quality and thermal comfort level of three kinds of air distribution were also given.The results show that when displacement ventilation or underfloor air supply is adopted,the better indoor air quality will be obtained,and the minimum outdoor air ventilation rate will be used more efficiently.

Key words:residential building; radiant cooling; the minimum outdoor air ventilation rate; indoor air quality; thermal comfort