PDH Heatless Desiccant Dryers

✅ Custom Engineered to Your Application
Materials, energy management systems, instrumentation, outdoor models, ATEX compliance, and CE / ASME certifications are all customizable.

✅ Sized to Your Needs
Each dryer is optimized for your specific process, ensuring the most energy‑efficient and cost-effective solution.

✅ Simple, Proven Design
Engineered for high reliability, minimal downtime, and easy operation.

✅ Low Investment Cost
Efficient construction ensures affordability without compromising on performance or quality.

✅ Compact & Maintenance-Friendly
Skid-mounted dryers with high-quality components ensure easy installation and trouble-free operation.

✅ Ideal for Hot Climates
Unlike other systems, PDH dryers use dry compressed air for regeneration instead of ambient air, making them ideal for hot and humid environments.

✅ Minimal to No Electrical Power Requirement
Power consumption is limited to a few hundred watts, and in some configurations no electrical power is required, reducing operating costs and enabling quick, straightforward installation at remote sites without the need for extensive electrical infrastructure.

✅ Stable Pressure Dew Point of -40°C Guaranteed
Optional configurations available for ultra-low dew points down to -70°C, depending on application requirements.

PDH dryers operate using a heatless pressure swing adsorption (PSA) process. Compressed air flows through one desiccant-filled tower, while the second tower regenerates using a controlled portion of dried air.

This alternating cycle ensures continuous operation with stable dew point performance, even under fluctuating load conditions. The absence of heaters or blowers reduces mechanical complexity and maintenance needs, improving reliability and making the PDH range ideal for continuous industrial use and remote installations where uptime is critical.

Delair PDH dryers are designed to achieve very low pressure dew points, making them ideal for applications requiring dry compressed air to prevent corrosion, freezing, or contamination.

High-quality desiccant media combined with an optimized airflow design ensures efficient moisture removal across a wide range of flow rates and pressures. This performance supports compliance with stringent compressed air quality standards in industries such as manufacturing, processing, and instrumentation.

Built for harsh industrial environments, PDH dryers feature durable pressure vessels, industrial-grade valves, and corrosion-resistant components.

The mechanical simplicity of heatless desiccant technology minimizes wear and tear, extending service intervals and reducing maintenance requirements. This robust construction makes PDH dryers ideal for installation in production plants, utilities, and outdoor or semi-protected environments.

Due to their high reliability and low investment cost, PDH dryers are also widely used as emergency backup compressed air dryers.

Optimize performance and reduce energy consumption with the Delair® Energy Management System (EMS). By minimizing unnecessary purge cycles, EMS reduces compressed air losses, extends desiccant life, and lowers operating costs.

Different levels of EMS control are available, ranging from standard dew point sensor control to advanced systems using desiccant adsorption temperature monitoring, delivering a more durable and maintenance-friendly solution.

Ideal for industries where dry, clean compressed air is essential, especially in harsh or remote environments where durability is critical, including:

• Oil & Gas facilities
• Chemical plants
• Remote industrial sites in the Middle East and Africa
• Utilities and process industries

The PDH series is also commonly used as a backup dryer solution alongside Delair DB or XD series dryers.

Every application is unique and requires a tailored solution.

Delair’s PDH series dryers can be fully customized to meet your process and site requirements. With decades of experience, our team works closely with you to deliver the most efficient and reliable compressed air drying system.

Frequently Requested Customizations:

• Control Systems
  Specific PLC brands, direct DCS integration, ATEX compliance
• Materials and Finishes
  Stainless steel vessels and piping, specialized coating systems
• Components
  Additional instrumentation, high-performance valves
• Approvals and Certifications
  ASME, PED, AD-2000, NOBO inspections
• Documentation
  Detailed as-built drawings, diagrams, and manuals
• Specialized Engineering
  Layout modifications, compact designs, and custom skid solutions
• Valve Limit Switches
  Monitor valve positions via DCS or local control panels
• Outdoor & Hazardous Area Configurations
• Bypass Systems
  Enable maintenance without process interruption
• Ancillaries
  Pre-filters, aftercoolers, silencers, and filtration systems

Have specific requirements or a challenging application? Contact Delair today to find the optimal air treatment solution.