Refrigerated Air Dryers
Refrigerated Air Dryer
Dryers that cool compressed air with a refrigeration cycle to condense and remove moisture. They reliably deliver dry air with a pressure dew point of 4–10 °C. GENEQ designs and builds both direct-expansion (SR) models cooled directly by refrigerant and indirect (SH) models cooled by chilled water.
Removing moisture by cooling the compressed air
A refrigerated air dryer uses the refrigeration cycle (compression → condensation → expansion → evaporation) to cool compressed air, so that the water vapor it carries is condensed into liquid and removed. As standard it produces dry air with a pressure dew point of 4–10 °C.
With a simple design and no consumables (desiccant or purge air), it is easy to operate and maintain.
A refrigerated dryer suits general processes where the goal is to prevent condensation; a desiccant dryer suits precision processes that need a sub-zero dew point.
Direct-expansion and indirect types
Item | Direct-expansion (SR) | Indirect (SH) |
|---|---|---|
Cooling method | Compressed air cooled directly by refrigerant | Indirect heat exchange with chilled water (brine) |
Refrigeration unit | Built in, standalone operation | Chilled water supply system required |
Guaranteed outlet dew point | 4 ~ 10℃ | 8 ~ 10℃ |
Characteristics | Can be installed alone without additional infrastructure | Gentle dew point variation, well suited to large capacities |
Suitable sites | No chilled water infrastructure, or standalone operation required | Chilled water infrastructure already available with spare capacity |
Standard design conditions
Item | Direct-expansion (SR) | Indirect (SH) |
|---|---|---|
Inlet air pressure | 7 barg (STD) | 7 barg (STD) |
Inlet air temperature | 40℃ (STD) | 40℃ (STD) |
Chilled water inlet temperature | - | 4℃ (STD) |
Guaranteed outlet dew point | 4 ~ 10℃ (STD) | 8 ~ 10℃ (STD) |
Refrigerant | R-407C (R-134a for large capacities) | R-407C |
The standard specifications vary with site conditions; please contact us for your capacity, dew point and pressure requirements.
In-house design and manufacturing capability
GENEQ applies its own microprocessor controller developed specifically for refrigerated dryers, and holds patents on power-saving technologies such as the electronic expansion valve (EEV) and the PCM and low-temperature condensate utilization system. Our design and manufacturing references range from small units to large capacities above 30,000 Nm³/h, and we also build
combination systems that pair an indirect refrigerated dryer with a desiccant dryer.
Sales inquiries
We propose whichever of the direct-expansion and indirect types is more advantageous, based on your required dew point, capacity and whether chilled water is available.
From design, manufacturing, installation and commissioning through to later maintenance and parts supply, GENEQ takes full responsibility.
