A refrigerated compressed air dryer removes moisture by cooling compressed air, separating the condensed water and draining it away. It suits applications whose required outlet dew point can be met by cooling. A dryer treats air supplied by a compressor; it does not generate compressed air.
How does a refrigerated air dryer work?
- Cool: moist compressed air passes through a heat exchanger.
- Condense: cooling below the air’s dew point turns part of its water vapour into liquid.
- Separate and drain: the dryer removes this liquid before the air continues downstream.
Reducing moisture helps limit condensation and corrosion in pneumatic valves, instruments and equipment. A working condensate drain is essential. Drying does not replace filtration for oil or particles.
Refrigerated, thermoelectric or desiccant: what is the difference?
| Type | How it removes moisture | Selection focus |
|---|---|---|
| Conventional refrigerated | A refrigeration compressor and refrigerant circuit cool the air; condensate is separated and drained. | Match rated flow, temperature limits and outlet pressure dew point to the application. Compact and plant-scale versions exist. |
| Thermoelectric / Peltier | A solid-state cooling module condenses moisture without a refrigeration compressor or refrigerant circuit. | Consider for compact equipment integration. Check the specific model’s flow, heat load and drying performance. |
| Desiccant | A drying material adsorbs water vapour and is regenerated or replaced. | Consider when a lower pressure dew point is required. Account for regeneration and, on heatless models, purge-air consumption. |
XENTRODRY ZLA models are thermoelectric compressed air dryers. They share the cooling-and-condensation principle with refrigerated dryers but use different cooling hardware. Do not assume that the two technologies have identical dew-point performance.
What should you check before choosing a dryer?
- Required flow: size for the air passing through this dryer, including simultaneous demand. A point-of-use branch may need much less flow than the whole factory.
- Pressure and temperature: check operating pressure, inlet temperature and the highest expected ambient temperature against the model’s rating conditions.
- Required pressure dew point: use the downstream equipment specification and the coldest expected pipe temperature.
- Installation: confirm dimensions, connections, supply voltage, ventilation clearance and condensate drainage.
- Other air-quality needs: select appropriate oil and particle filtration alongside drying.
A cooling-chamber setting is not the same measurement as outlet pressure dew point. Request performance at your actual operating conditions when comparing models. KAESER’s sizing guide explains how pressure and temperature affect rated dryer capacity.
Which compact XENTRODRY model should you compare?
The ZLA compact compressed air dryer range targets low-flow laboratory instruments, pneumatic controls and OEM equipment. Start with rated flow, then confirm pressure, temperature, available space and the required drying result.
For lower-dew-point requirements, compare the DS desiccant range. See the OEM integration guide for equipment-level selection.
Common air dryer selection questions
Is a moisture separator enough?
A separator removes liquid water; a dryer reduces water vapour that could condense later. A separator alone does not provide the same treatment as a dryer.
Does a large machine always need a large dryer?
No. Select for the machine’s actual compressed-air demand and quality requirements. A compact dryer can serve a suitable low-flow branch within a larger machine.
Updated · Product specifications: XENTRODRY
Further technical reading: KAESER compressed air treatment guide. Manufacturer references explain general principles; ZLA specifications come from the linked XENTRODRY product pages.