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For a typical single duct air system there will be one zone supply air path and one zone return air path. 对于典型的单管空调系统，一般由一条区域送风路径和一条区域回风路径组成。
With a project example,compare the primary return air system with the secondary return air system,especially in design of the AHU. 混合式空调系统中一次回风系统与二次回风系统是两种常见的处理方式,两种方式各有优缺点。
The computing characteristics of primary return air system for supermarket 大型商场空气调节一次回风系统的计算特点
primary return air system 一次回风系统
return air system ofAC 回风系统
Hinged type return air louvre, model ARLH. ARLH型风口属可开式侧壁格栅风口。
YDetermine system efficiency by comparisons of return air and delivery temperatures. 通过比较新风和回风的温度,确定系统的效率。
Control valve in an air system for setting volume and pressure. 为了保持流量和压力的空气系统的控制阀门。
Application of fuzzy control technique to secondary return air systems in large spaces 模糊控制技术在大空间二次回风空调系统中的应用
PID temperature control system, display the regenerate air temperature and return air temperature. 采用PID温度控制系统，可显示再生温度和低露点回风温度；
A typical dual duct system would have 2 zone supply air paths ? one for the hot air and one for the cold air ? and 1 zone return air path. 而对于典型的双管系统，则由两条区域送风路径（一条用于热空气、一条用于冷空气）和一条区域回风路径组成。
General Ventilators 、 Make-up Air Systems etc. 一般通风设备、空调箱等。
The secondary air system on the cylinder reduce the emission of the exhaustgas. 汽缸体上设置二次补气系统，有效降低排放。
My vacation begins next week. I've got a return air ticket to my hometown. 我下周休假,已经买好了回家乡的往返机票。
At this time there can only be 1 Zone Mixer in a Zone Return Air Path. 这种情况下一个区域回风路径只能有一个区域混风器。
Forced air systems send heated air through ductwork. 机械通风通过管道系统来输送热空气。
Now he knows his way around the boat, sir, he knows the engines, the compressed air system, the batteries, all that. 长官,他对舰上的事是懂的,象机器、空气压缩系统、电池组什么的,他全懂。
secondary return air system 二次回风系统
Calculation and comparison between the fan-coil add new air system and VRV system were proposed in the paper. 选用普通间冷风机盘管加新风系统和变频系统与数码涡旋系统进行比较计算。
In the year 2007,Central Fresh Air System ,branded Venson entered China formally . 2007年，闻森品牌中央新风系统正式入驻中国。