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Home> Company News> Heat or No Heat? A Quick Guide to Desiccant Air Dryers

Heat or No Heat? A Quick Guide to Desiccant Air Dryers

2026,02,06

When you need compressed air with a pressure dew point lower than -20°C for demanding applications, choosing the right desiccant dryer is key. Here's the difference between the two common types -1.

 

Feature

Heaterless  Dryer

Micro-heat Dryer

Core Principle

Uses expanded, dry compressed air (purge gas) for regeneration -1-9.

Uses a small electric heater to warm the purge gas, reducing its consumption -1-9.

Main Energy Use

Compressed air (Purge gas). Energy consumption can be high -4.

Compressed air + electricity for heating -1.

Typical Purge Air Loss

Higher (can be ~15% or more of product air) -4.

Lower than heaterless models, as heating reduces the required purge air volume -1.

Pressure Dew Point

Can reach very low dew points (e.g., -40°C, -70°C) -1.

Can maintain a stable, low dew point (e.g., -40°C to -70°C) -9.

Cycle Time

Short adsorption/regeneration cycles (e.g., ~5-10 minutes) -4.

Longer cycles than heaterless dryers (e.g., 60-80 minutes) due to heating/cooling phases -9.

Best For

Simplicity, smaller air flows, lower initial investment -4.

Applications where minimizing compressed air loss is a priority over the added electricity cost.

The Bottom Line:

Choose a Heaterless Dryer if you prioritize simpler design and lower upfront cost, and can accept higher ongoing compressed air (energy) losses -4.

75hp screw air compressor

Choose a Micro-heat Dryer if your goal is to reduce total compressed air consumption, trading some purge air loss for electrical heating cost

· 

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Author:

Mr. Grace

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grace@cnjiubei.com

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Author:

Mr. Grace

E-mail:

grace@cnjiubei.com

Phone/WhatsApp:

+86 13414280001

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