Final answer:
Dryers or dehydrators are used to remove moisture from compressed gas, important for preventing issues like corrosion or freezing in pipelines. They function as part of a system that involves condensing the gas into a liquid and then re-expanding it for cooling.
Step-by-step explanation:
The devices that remove moisture from compressed gas in a compressed gas system are commonly known as dryers or dehydrators. These systems typically use desiccants, refrigeration, or specialized membranes to reduce moisture content. They are crucial for preventing corrosion, freezing in pipelines, and ensuring the proper function of pneumatic tools and equipment.
In a compressed gas system, as the gas is compressed and travels through these dryers, its temperature and pressure raise. When it passes through the condenser coils, it transfers energy to the room and condenses into a liquid. This liquid, now colder, moves through a pressure-reducing valve back to the evaporator coils, ready to cool once again during the cycle.