在图 2-1的上方，隔离活门将左右系统分隔成独立的两部分。在隔离活门的左边， APU引气管道立连接着左交输管道；在右边，压缩空气地面接头连接右交输管道。用户系统可以从这些管道获得压缩空气，通过适当的控制活门进行控制。
LESSON 3 AIR CONDINTION空调系统
一、单词二、TEXT
空气调节  Air conditioning 环境  Ambient 机组  Crew
加热  heat 冷却  Cool 增压  pressurization
引出，放出  Bled 总管道  Manifold 分离  Seprate 

独立的  indenpendent 冷却组件  Cooling pack 调节，管理  regulate
暖，热  Worm 减少  Reduce 期望  Desire
涡轮冷却器  Air cycle machine 整的  Integral 包括  Consist of
共同的  Common 轴  Shaft 离开  Leave
膨胀 V  Expand 膨胀 N  Expansion 下降  Drop
零下  Sub-zero 分配  Distribute 此外  In addition
配平空气管道  Trim air line 混合  Mix 室、容器  Chamber
加上，增加  Add 头顶上  Overhead 竖管  Raise
收集器  Collector 防护罩  Shroud 过滤器  Filter
排出口  discharge 再分配  Redistribute 二等分  halve

(1) the air conditioning system provides a conditioned air environment for the passengers and crew , heats the cargo compartment, cools the electronic equipment, and supplies air for the pressurization system.

空调系统为旅客和机组提供环境温度的控制，为客舱供热，为电子设备舱降温，还有为增压系统提供空气。

(2) Air is bled from the pneumatic manifold and conditioned by 2 separate and independent cooling packs. Air flow into the packs is regulated by the pack valves.

空气从增压主管道和空调中通过 2个隔离的，相互独立的冷却组件中被引入。空气流进组件中通过组件活门调节。

(3) Air from the pneumatic manifold is too warm and must be cooled. The pupose of 2 packs is to reduce engine bleed air temperature to the desired temperature.

从增压主管道中来的空气太热，需要降温。两个组件的作用就是将发动机引气温度降低到需要的温度。

(4) An air cycle machine is an integral unit of each cooling pack. The air cycle machine consists of a turbine wheel and a compressor wheel mounted on a common shaft. Air flowing through the air cycle machine drives the turbine, the turbine drives the compressor section. As the air leaves the turbine it expands greatly. This expansion can cause the

temperature of the air to drop to sub-zero levels.
涡轮冷却器是构成每个冷却组件所必需的。它包括一个涡轮和一个压气机，安装在共同的轴上。气流通过涡轮冷却器驱动涡轮，涡轮驱动压气机部分。当空气离开涡轮后急剧膨胀。这种膨胀能够导致空气温度降到零度以下的程度。
(5) In figure 3-1, we can see that the conditioned air from the right pack flows into the main distribution manifold, the conditioned air from the left pack flows into the main distribution manifold and into the flight compartment. In addition, a trim air line from the left mix chamber adds hot air to the flight compartment duct. The main distribution manifold supplies the passenger compartment overhead distribution system through tow sidewall risers.