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PDH Heatless Desiccant Dryers

The Delair™ PDH heatless dryer is suitable for use in hot climates and in the absence of high voltage power. In the heatless system, the desiccant is regenerated with part of the dried air without the application of heat.

The Delair PDH Heatless Desiccant Dryers are engineered to deliver consistently dry compressed air for industrial processes where moisture control is critical. Using a proven twin‑tower, heatless adsorption principle, PDH dryers achieve stable low pressure dew points without external heating, making them a reliable and energy‑efficient solution for demanding environments. Designed for long service life and operational simplicity, the PDH range supports a wide variety of industries where air quality directly impacts productivity, product integrity, and equipment protection.

Proven Heatless Adsorption Technology

PDH dryers operate on a heatless pressure swing adsorption process, where compressed air flows through one desiccant‑filled tower while the second tower regenerates using a controlled portion of dried air. This continuous cycle ensures stable dew point performance even under fluctuating operating conditions. The absence of heaters or blowers reduces mechanical complexity, improving reliability and making the PDH range particularly suitable for continuous or remote operation where uptime is critical.

Reliable Low Dew Point Performance

Delair PDH dryers are designed to achieve very low pressure dew points, suitable for applications requiring dry air to prevent corrosion, freezing, or product contamination. The high‑quality desiccant media and optimized airflow design ensure consistent moisture removal across a wide range of flow rates and pressures. This performance supports compliance with stringent compressed air quality standards used in manufacturing, processing, and instrumentation environments.

Robust Industrial Design

Built for harsh industrial conditions, PDH dryers feature durable pressure vessels, industrial‑grade valves, and corrosion‑resistant components. The mechanical simplicity of the heatless design minimizes wear points, extending service intervals and reducing maintenance requirements. This robust construction makes the PDH range well suited for installations in production plants, utilities, and outdoor or partially protected environments.

Optimized Operating Efficiency

While heatless dryers rely on purge air for regeneration, the PDH series is engineered to optimize purge consumption while maintaining reliable drying performance. This balance helps reduce overall compressed air losses and operating costs compared to older or poorly optimized desiccant systems. Optional control and monitoring features further support efficient operation and allow integration into modern compressed air management strategies.

Versatile Applications Across Industries

The PDH heatless dryer range is suitable for a wide range of industries, including general manufacturing, automotive, electronics, energy, and process industries. It is especially valuable wherever moisture in compressed air could lead to equipment failure, inconsistent product quality, or unplanned downtime. The flexible design allows easy integration with compressors, filters, and downstream air treatment equipment.
  • Heatless adsorption design
  • Twin‑tower configuration
  • Continuous operation
  • Low pressure dew point capability
  • Optimized purge regeneration
  • High‑performance desiccant filling
  • Industrial‑grade valves
  • Robust pressure vessel construction
  • Low maintenance concept
  • Easy system integration
  • Dryer type: Heatless desiccant compressed air dryer
  • Drying principle: Pressure Swing Adsorption (PSA)
  • Pressure dew point: −40 °C PDP (typical, model‑dependent)
  • Regeneration method: Compressed air purge
  • Purge air consumption: approx. 12–18 % of nominal flow
  • Operating pressure: 4 to 13 bar(g)
  • Design pressure: up to 16 bar(g)
  • Inlet air temperature: +5 °C to +50 °C
  • Ambient temperature: +5 °C to +40 °C
  • Flow capacity: approx. 5 to 3,000 Nm³/h (model range)
  • Desiccant type: Activated alumina / molecular sieve (model‑dependent)
  • Valve actuation: Pneumatic
  • Power supply: Not required (mechanical operation)
  • Installation: Downstream of compressor and filtration
  • Maintenance interval: Desiccant replacement typically every 3–5 years (application‑dependent)

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FAQs

A heatless desiccant dryer removes moisture from compressed air by passing it through a desiccant material that adsorbs water vapor. While one tower dries the air, the second tower regenerates using a portion of the dried compressed air. This process operates continuously without external heat, ensuring reliable low dew point performance with a simple and robust system design.