干热气候区高大空间夏季置换通风空调热环境及节能效果分析

Analysis of thermal environment and energy saving performance for displacement ventilation air conditioning in large space in dry-hot climate zone in summer

高大空间建筑具有特殊的功能性,其冷负荷特征与传统公共建筑不同。本文针对新疆某机场航站楼候机厅,利用CFD模拟分析了喷口射流(上送下回式)与置换通风2种气流组织形式下的室内环境温度场及速度场。结果表明:在相同的室内热舒适环境下,采用置换通风方式的空调系统送风量减少37.5%,送风温度提高4℃,这对干热气候区夏季空调冷源选择、优化设计与经济运行带来较大益处;此外,人员呼吸区的空气不断被置换通风送入的新风置换,避免与室内空气回流混合,具有较高的排污效率,能减少或避免污染物在室内扩散,保持工作区内较高的空气质量。

The special architectural function of large space buildings makes their cooling load characteristics different from those of traditional public buildings.For the departure hall of an airport terminal in Xinjiang,this paper analyses the indoor environment temperature field and velocity field in nozzle jet(upper supply and lower return type)and displacement ventilation by using the CFD.The results show that in the same indoor thermal comfort environment,the air supply volume of the air conditioning system with displacement ventilation is reduced by 37.5%,and the air supply temperature is increased by 4℃,which brings great benefits to the cold source selection,optimization design and economic operation of air conditioning in the dry-hot climate zone in summer.In addition,the air in the breathing area of personnel is constantly replaced by the outdoor air sent by displacement ventilation,avoiding mixing with the indoor air recirculation,and its high purification efficiency can reduce or avoid the spread of contaminant in the room,which will maintain the air quality in the work area.