primary return air system

基本解释

Primary return air system and secondary return air system are the two kinds of deal with the air in the mixture air system, they both have their advantages and disadvantages.
从二次回风空调系统的节能分析，正压控制，医疗建筑废热、废水的再利用，运行管理等方面探讨了减少洁净手术室空调系统能耗的途径和方法。
The calculation method of supply and return air volume of air-conditioning system with primary return air and summer air-conditioning system in a metro station of Shenyang City is introduced.
分析了我国地铁站域公共空间发展存在的主要问题，提出通过推动地铁站域公共空间的集约化建设，带动城市空间高度集约化的整体性发展。