本文提出了保证机掘工作面有效通风的评价指标——换气效率(air exchange efficiency)、排污效率(ventilation efficiency)和空气品质（air quality），为评价机掘工作面通风有效性提供了一种新的理论依据。
基于20个网页-相关网页
overall ventilation efficiency [矿业] 总通风效率
ventilation efficiency detail 通风效率
ventilation efficiency indices 通风性能参数
mechanical ventilation efficiency 机械通气效率
Radiation cooling system, with low operating cost, can provide excellent indoor thermal environment. Displacement ventilation with high ventilation efficiency, can provide high indoor air quality.
辐射供冷能提供极佳的室内热环境,运行成本低；置换通风具有较高的通风效率,能提供较高的室内空气品质。
参考来源 - 顶板辐射与置换通风复合供冷系统热环境模拟·2,447,543篇论文数据，部分数据来源于NoteExpress
Obtains a method for evaluating ventilation efficiency and air age after studying the ventilation course.
通过对通风过程的研究，得到了一个用于评价通风系统性能的通风效率和空气龄的方法。
Conclusions: The endotracheal tube without dead space significantly increases conventional ventilation efficiency in rabbits.
结论：无死腔气管插管可明显提高常规机械通气效率。
Measures the ventilation efficiency of the displacement ventilation systems for an office room, an assembly room and a gymnasium.
对办公室、会议室及体育馆置换通风系统的通风效率进行了实测。
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