|Premier Refrigerated Air Dryers
Premier Air Systems PRA Series Refrigerated Air Dryers
- Economical Operation ~ Minimum electric energy consumption
- Low Pressure Drop ~ Minimum compressed air energy cost
- Automatic Non-Cycling Operation ~ Continuous, stable dew point
- Compressed Air Precooler/Reheater ~ Eliminates pipe sweating (125-2,000 scfm models)
- Convenient Hot-Gas Bypass Setting ~ Easy access for seasonal adjustment
- Reliable Drain ~ Automatically discharges condensate from dryer
- Compact Size/Quiet Operation ~ Expands installation options
- View Technical Data (PDF)
PRA Series air dryers remove water and contaminants from compressed air before they cause damage to pneumatic valves, tools, air system piping, downstream processes, and finished product. The compression process itself causes air to become saturated with water, compressor lubricant aerosols, and other contaminants. If left untreated, rust and scale may form in air system piping and ice may build inside air piping that passes through freezing ambient conditions.
Warm air at low pressure holds the most water in vapor form and the moisture holding capacity of air doubles with each 20°F increase in air temperature. When compressed to useful pressure of 80 – 100 psi, air becomes saturated with water making treatment necessary. A properly sized air dryer is essential for efficient removal of water before the air is used.
PRA Dryer Operation
PRA refrigerated dryers incorporate a non-cycling refrigeration system, heat exchanger, separator, and drain to provide treatment for clean and dry compressed air applications. The refrigeration system and heat exchanger are used to cool compressed air as it flows through the dryer. Cooling causes moisture in the saturated air to condense so it can be separated from the air, collected and discharged through a reliable drain. Air is clean and dry when it exits the dryer to flow downstream for use. All PRA dryer components are sized to provide high efficiency – even at full rated flow.
Superior Heat Exchanger Design
PRA heat exchanger assemblies are engineered exclusively for compressed air drying. They have a high heat transfer coefficient that provides optimum air treatment efficiency. Exchanger assemblies in 70-2,000 scfm models are made entirely of stainless steel for corrosion resistance and durability, and they include a unique multi-path internal flow pattern that reduces fouling potential. Low pressure drop in all PRA models keeps compressed air energy consumption low.
PRA Series dryers are compact in size, requiring little floor space. Convenient electric service and condensate drain connections are provided along with common air system piping sizes for installation ease.