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Heat-of-Compression Dryers

Heat-of-Compression (HOC) Desiccant Dryers – HC Series

Unsurpassed energy efficiency with stable -40°C dew points

CompAir HC Series Heat-of-Compression (HOC) desiccant dryers deliver reliable, high‑quality compressed air while consuming virtually no additional energy. By recovering heat generated during compression, HC dryers provide continuous, low dew point performance with minimal operating cost — making them the most energy‑efficient desiccant dryers available.

Designed for demanding industrial environments, the HC Series ensures year‑round pressure dew points below -40°C, helping protect downstream equipment, processes and product quality.

Why choose CompAir HC Series HOC dryers?

Reliable dry air with minimal energy use

HC Series dryers use recovered compression heat — free energy that would otherwise be wasted — to regenerate the desiccant, eliminating the high energy consumption associated with conventional regenerative dryers.

Proven design for mission‑critical applications

With a simple dual‑tower construction, high‑performance two‑way valves and minimal moving parts, the HC Series is engineered for long service life and dependable operation.

Stable dew point performance

Advanced stripping and cooling cycles deliver consistent -40°C or lower pressure dew points, without temperature or dew point fluctuations.

Designed to protect your compressed air system

Low purge air consumption, minimal pressure drop and intelligent control protect overall system efficiency and reduce lifecycle costs.

CompAir heat-of-compression air dryer with dual vessels

Key product benefits

  • Virtually zero energy consumption for regeneration using recovered heat
  • Negligible purge air loss, maximising usable compressed air
  • Consistently low pressure dew points down to -40°C
  • Minimal pressure drop thanks to full‑flow valves and optimised piping
  • High reliability with robust components designed for heavy‑duty operation
  • PLC‑based control system for continuous monitoring and performance assurance
  • Flexible installation, suitable for use with multiple compressors
CompAir heat-of-compression air dryer, front-right view, dual vessels

Heat-of-compression technology explained

CompAir HC Series dryers employ a dual‑tower desiccant design that uses the naturally high temperature of oil‑free compressor discharge air to regenerate the drying media.

This process removes moisture without relying on high electrical heaters or significant purge losses, delivering exceptional energy efficiency while maintaining a stable dew point.

The design also includes controlled stripping and cooling phases, ensuring moisture is fully removed and preventing dew point spikes under changing operating conditions.

 

Compatible compressor configurations

HC Series HOC dryers are specifically engineered for use with:

  • Oil‑free screw compressors
  • Fixed speed and variable speed compressors
  • Applications requiring ISO 8573 compressed air quality standards

Their design supports integration into both new installations and existing compressed air systems.

Rear-right view of CompAir heat-of-compression air dryer with dual vessels

Control and monitoring

Each HC Series dryer is equipped with a PLC‑based control system that:

  • Maintains optimal dryer performance
  • Continuously monitors operating conditions
  • Supports early fault detection to minimise downtime

This intelligent approach safeguards compressed air quality while reducing maintenance risk.

 

Typical applications

HC Series dryers are ideal for industries where continuous, ultra‑dry air and energy efficiency are critical, including:

  • Automotive manufacturing
  • Electronics and semiconductor production
  • Pharmaceuticals
  • Food and beverage processing
  • Chemical and petrochemical industries
  • High‑purity industrial air systems

Model

Flow @ 7 bar [m³/hr]

Flow @ 7 bar [m³/min]

CFM

Weight [kg]

Dimensions L × W × H [mm]

HC-6

976

16

574

2900

2540 × 1803 × 2521

HC-9

1525

25

897

3036

2540 × 1803 × 2521

HC-14

2262

38

1331

3336

2820 × 1956 × 2573

HC-21

3429

57

2017

5280

3048 × 2007 × 2642

HC-30

4940

82

2906

5310

3277 × 2540 × 2700

HC-41

6385

106

3756

8085

3683 × 2870 × 2920

HC-54

8782

146

5166

8747

3810 × 3200 × 2902

HC-69

11115

185

6538

9947

4445 × 3455 × 2985

HC-85

13722

229

8072

11768

4623 × 4521 × 3251

HC-103

16602

277

9766

13379

5002 × 3962 × 3202

HC-122

19752

329

11619

15102

5561 × 4064 × 3404

HC-143

23190

386

13641

16916

5637 × 4216 × 3404

HC-166

26894

448

15820

19410

6247 × 4369 × 3556

Capacity based on compressor discharge temperature: 107 °C, cooling water inlet temperature: 29 °C, operating pressure: 7 bar(g), regenerative type dryers.