CDA Systems Dryer experts in Silicon Valley since 2009
Dew point is the air temperature at which water vapor condenses at a given pressure. It may be expressed as pressure dew point or atmospheric dew point. Pressure dew point (PDP) is the lowest temperature to which compressed air can be exposed without causing condensation of water vapor. Atmospheric dew point is the temperature at which condensation occurs once the compressed air is reduced to atmospheric pressure.
For example, when air at 100 psig and 40°F PDP is reduced to atmospheric pressure, its atmospheric dew point is –3°F. Because air systems operate at pressure and sizing a dryer based on atmospheric dew point can result in insufficient moisture removal, this distinction is critical. Determining the specific pressure dew point is the single most important factor in selecting the correct dryer.
Removing water vapor from air costs money. The drier the required air, the higher the initial and operating costs. Spec’ing a greater degree of drying than necessary wastes energy and money. Matching the capability of air-drying equipment to the requirements of the air system will result in substantial savings in purchase price and moreover, operating costs.
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