液压油黏度、容积效率和液压系统工作效率均下降，泄漏增加，甚至使机械设备无法正常工作。
The hydraulic fluid viscosity, the volumetric efficiency and the hydraulic system working efficiency drops, divulging increases, even causes the mechanical device to be unable the normal work.
制冷设备和热泵。安全和环境要求。容积式制冷剂压缩机。
Refrigerating systems and heat pumps - Safety and environmental requirements - Positive displacement refrigerant compressors.
然而这些商用建筑中目前普遍使用的基本上都是容积式的热水供应设备，许多是以电做为热源的。
However, most of these commercial building are using positive displacement hot water supply equipments, and most of these equipments use electricity as their heat sourse.
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