空气混合器对空调新回风混合效率的影响  

Influence of air mixer on mixing effectiveness of outdoor air and return air for air-conditioning

作　　者：陈卫 Chen Wei(Ingersoll Rand Engineering & Technology Center-Asia Pacific)

机构地区：[1]英格索兰亚太工程技术中心

出　　处：《制冷与空调》2019年第6期42-46,共5页Refrigeration and Air-Conditioning

摘　　要：分析冬季组合式空调机组翅片管式换热器冻坏的原因,并引入空气混合效率的概念和计算公式,指出减少空气分层流动、提高空气混合效率对翅片管式换热器防冻的必要性。介绍利用空气混合器提高组合式空调机组内空气混合效率的措施,并用CFD分析方法对比带和不带空气混合器时混风段的空气混合效率。结果表明,应用空气混合器可以显著提高翅片管式换热器前的最低进风温度和空气混合效率,有效防止翅片管式换热器冻坏。The frozen reason for the finned-tube heat exchanger of central-station air handling unit (AHU) in winter is analyzed. The concept and the calculation formula of air mixing effectiveness are introduced. It's indicated that decreasing the air stratification and increasing the air mixing effectiveness are very necessary for anti-freezing of finned-tube heat exchanger. The measure of applying an air mixer to increase the air mixing effectiveness in the central-station AHU is introduced. In addition, the air mixing effectiveness of the mixing box by using or not using an air mixer are compared through CFD analysis. The result shows that applying an air mixer could increase the minimum air inlet temperature before the finned-tube heat exchanger and the air mixing effectiveness evidently, which effectively prevents the finned-tube heat exchanger from freezing.

关 键 词：组合式空调机组 翅片管式换热器 防冻 空气混合器 空气混合效率 新风比 CFD 

分 类 号：TB657.2[一般工业技术—制冷工程]