DB Heat Regenerated Dryers

In a heat-regenerated desiccant dryer, heated ambient air is used during the regeneration phase. Compared to heatless dryers, heated dryers are significantly more energy efficient, but they can typically create temperature and dew point spikes during tower changeover.

Delair’s unique co-current cooling and parallel drying technology eliminates these issues, ensuring stable pressure dew point and outlet temperature performance during changeover.

This is achieved without using purge air, meaning the amount of air entering the dryer equals the amount leaving it. This frees up compressor capacity and avoids air consumption peaks, reducing overall operating costs.

DB dryers are therefore an ideal solution for continuous-duty industrial applications with high compressed air demand, where energy efficiency, stable performance, and consistent air quality are essential.

A Delair® DB dryer is perfectly suited for applications requiring low pressure dew points down to –40°C. The Delair™ DB-L variant can reach ultra-low dew points of –70°C or lower. For highly critical manufacturing processes, such as semiconductor production, the DB-LD dryer is particularly valued for its exceptional air quality and low operating costs.

An optional compressor heat recovery unit is available, allowing recovery of compressor heat to reduce electrical power consumption even further.

Thanks to its high level of customization, wide flow range, gradual tower switchover, and energy recovery options, the Delair DB series is an excellent choice downstream of oil-free screw compressors or centrifugal (turbo) compressors.

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

✅ Sized to Your Needs
Each dryer is optimized for your application to deliver the most efficient and cost-effective solution.
Multiple variants (DB, DB-RC, DB-LD) are available, each with specific performance advantages.

✅ No Purge Air Loss
“Air in = air out.” No purge air is required during regeneration, maximizing compressed air system efficiency.

✅ Stable Dew Point and Temperature Performance
No dew point or temperature peaks during tower switch-over thanks to co-current cooling and parallel drying technology.

✅ Low Pressure Drop
Optimized design ensures pressure drop remains below 0.1 bar, improving system efficiency.

✅ Low Power Consumption
Thermostatically controlled regeneration and insulated components minimize energy use.

✅ Optional Compressor Heat Recovery
Recovering heat from the compressor via a heat exchanger further reduces energy consumption.

✅ Compact & Maintenance-Friendly
Skid-mounted design with high-quality valves and actuators ensures easy installation and minimal maintenance.

✅ PLC-Controlled Operation
Advanced automation ensures full control and easy system integration. PLC options include Siemens, Allen‑Bradley, and others.

The DB Series uses desiccant adsorption technology to remove moisture from compressed air. Two towers operate alternately—one drying the air, the other regenerating.

Regeneration is achieved using heated ambient air via a blower, eliminating the need for purge air loss, which is common in traditional dryers. This ensures maximum efficiency and stable outlet air quality.

Delair’s co-current cooling and parallel drying method prevents the dew point and temperature spikes that conventional heated dryers tend to experience.

The Delair Energy Management System (EMS) continuously adjusts dryer performance based on real-time operating conditions, including:

• Outlet dew point
• Inlet air temperature
• Dryer load
• Regeneration temperature levels

Monitoring regeneration temperature ensures the desiccant is fully regenerated, while preventing overheating that could accelerate desiccant aging.

Precise control of pressurization and depressurization cycles prevents movement of desiccant beds and reduces wear on valve seats.

Delair’s EMS guarantees minimum power consumption, while maintaining stable dew point performance, eliminating spikes, and maximizing the lifetime of components and desiccant material.

Every application is unique and requires a tailored solution.

Delair’s DB series dryers can be fully customized to your process and site requirements. With decades of expertise, our team works alongside you to deliver the optimal 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 coatings
• 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, custom skid solutions
• Valve Limit Switches
  Monitoring via DCS or local control panel
• Outdoor & Hazardous Area Configurations
• Bypass Systems
  Allow maintenance without interrupting operations
• Ancillaries
  Filters, steam heaters, pre- or aftercoolers
• Compressor Energy Recovery
  Regeneration pre-heating using compressor heat to reduce electrical consumption

In addition to the standard DB design, Delair offers specialized variants, each delivering unique benefits while maintaining the core DB design philosophy of efficiency and reliability.

Delair® DB-RC Series – Recirculation Cooling

The RC variant recirculates air during the cooling phase in a closed-loop system, improving adsorption capacity and extending cycle times. This results in lower energy consumption and reduced stress on the desiccant.

Delair® DB-LD Series – Low Dew Point

The LD variant incorporates advanced features such as a closed cooling loop, dual-layer desiccant bed, and reversed regeneration flow, enabling ultra-low dew points while maintaining reliable Delair performance.

Ideal for industries requiring dry, clean, high-quality compressed air, including:

• Semiconductor manufacturing
• Power generation
• Electronics
• Chemical processing
• Oil & Gas
• Food & beverage
• General manufacturing

Recommended Usage by Variant:

• DB
  Applications requiring energy efficiency, stable dew point, and consistent outlet pressure
• DB-RC
  Harsh environments, including hot and humid climates, or applications focused on maximum energy efficiency
• DB-LD
  Dewpoint critical applications such’s a Semi conductor and Oil & Gas where air comes in direct or indirect contact with the products.