Daeser Pneumatics

The outgoing cooled air pre-cools the hot incoming air, condensing the moisture present into liquid water which is drained out of the system. The pre-cooled air then enters an air-to-refrigerant heat exchanger which cools it using a liquid refrigerant.

It is a device that cools compressed air to condense and remove water vapor, specifically designed for systems operating at lower pressures (typically below 10 bar).

1. Warm, moist air enters the dryer.

2. Air passes through a heat exchanger, where it is pre-cooled.

3. It then enters a refrigeration unit, where temperature drops (around 2°C to 5°C).

4. Moisture in the air condenses into water droplets.

5. A moisture separator removes the water.

6. Dry air is slightly reheated and sent to the system.

• Compressor

• Condenser

• Expansion valve

• Evaporator

👉 Similar to a refrigerator or AC system.

• Produces air with a dew point of about +3°C

• Continuous operation

• Low operating cost

• Suitable for general industrial use

• Air-to-air heat exchanger

• Refrigeration compressor

• Evaporator

• Moisture separator

• Automatic drain valve

• Control panel

• Small to medium industries

• Pneumatic tools

• Packaging units

• Automobile workshops

• General plant air systems

• Energy efficient for low-pressure systems

• Low maintenance

• Simple design

• Cost-effective

• Cannot achieve very low dew points (unlike adsorption dryers)

• Not suitable for extremely dry air requirements

• Performance affected by ambient temperature

It is a type of air dryer that works on the principle of adsorption, where water vapor sticks to the surface of a solid material (desiccant), such as silica gel, activated alumina, or molecular sieves.

1. Moist air enters the dryer from the compressor.

2. Air passes through a desiccant bed.

3. The desiccant adsorbs moisture from the air.

4. Dry air exits the system for use.

5. Meanwhile, another chamber is regenerated (dried) for reuse.

👉 Most systems use two towers:

• One tower dries the air

• The other regenerates the desiccant

1. Heatless (Pressure Swing Dryer)

   • Uses a portion of dry air for regeneration

   • Simple and widely used

2. Heated Dryer

   • Uses external heaters to regenerate desiccant

   • Saves compressed air

3. Blower Purge Dryer

   • Uses ambient air with a blower + heater

   • More energy-efficient for large systems

• Achieves very low dew points (up to -40°C to -70°C)

• Suitable for critical applications

• Continuous operation with twin towers

• Two pressure vessels (towers)

• Desiccant material

• Control valves

• Filters (pre & after filters)

• Controller system

• Pharmaceutical industry

• Food & beverage processing

• Electronics manufacturing

• Instrument air systems

• Chemical plants

• Very dry air output

• Reliable for sensitive equipment

• Works in harsh conditions

• Higher initial cost

• Requires regular maintenance

• Desiccant replacement needed over time