Externally Heated Air Dryers
The Advanced Heat Regenerated Air Dryer for Industrial Compressed Air Systems.
At Harsiddhi Air Solution, we engineer and manufacture Externally Heated Air Dryers that provides efficient and dependable moisture removal in industrial compressed air systems. Our dryers are designed with accurate engineering using external heaters and a small purge air flow for regeneration, providing considerable energy savings, low dew point, and long desiccant life.
Harsiddhi Air Solution is one of India’s leading manufacturers of air drying systems, utilizing innovation, proven technologies, and ISO-certified quality standards to guarantee that each dryer is built for consistent performance and durability in a demanding industrial environment.
What is Externally Heated Air Dryer?
An Externally Heated Air Dryer is a dual-tower desiccant type dryer that utilizes external heaters along with a small amount of dry purge air to remove moisture from compressed air, as desiccant drying capability as well as regeneration.
Externally heated dryers, as opposed to heatless dryers (which only rely on purge air), will preheat the purge air outside of the tower, and application while providing heat inside the section of the desiccant bed for the drying functions. This means less air loss (typically under 5 0r 7%) and superior drying function.
The result is a continuous supply of moisture (dew points between -40C to -60C) free compressed air required for most sensitive industrial applications.
Operation Principle of Externally Heated Air Dryer
- Adsorption Series: Moisture-laden compressed air enters the online tower and the desiccant adsorbs water vapor: dry air exits to supply the plant air network.
- Regeneration Series: The online tower takes dry air, which was heated externally, and passes it through the desiccant bed to remove moisture that the desiccant had previously adsorbed.
- Cooling and Depressurization: After regeneration, the regeneration tower is cooled off using some dry air before reversing the cycles to ensure stable outlet dew points.
- Cycle Reversal: The two towers alternate between drying and regeneration based on a programmed PLC cycle or time-based control.
Features and Benefits of Externally Heated Air Dryer
- Energy Efficient Operation – Utilizes external heaters and low purge air to minimize energy costs.
- Low Purge Loss – Only 5-7% of dry air is consumed for regeneration.
- Stable Dew Point – Constant dew points can be reached to –60°C.
- Longer Desiccant Life – Regeneration is optimized in a way to avoid overheating and breaking down of the desiccant media.
- PLC Controlled – Fully automated for ease of monitoring and management of the cycle.
- Rugged Design – Works for high-volume continuous industrial duty.
- Low Maintenance – Simple design and high-quality components enable longevity for the product.
- Compact Sided Mount – Easy to install in conjunction with existing compressed air systems.
Technical Specifications of Externally Heated Air Dryer
| Parameter | Typical Value |
|---|---|
| Flow Capacity | 10 – 5000 Nm³/hr (customizable) |
| Dew Point | –40°C to –60°C |
| Working Pressure | Up to 10 kg/cm² |
| Purge Air Consumption | 5–7% of rated flow |
| Heater Power | 2 – 18 kW (model dependent) |
| Power Supply | 415V, 50Hz, 3 Phase |
| Regeneration Type | External Electric Heating + Dry Air Purge |
| Cycle Time | 4–8 hours (adjustable) |
| Mounting Type | Skid or Floor Mounted |
External Heated Air Dryer Applications
- Pharmaceutical and Biotech Sector – Clean and dry air for fabrication and packaging.
- Food and Beverage Sector – Hygienically clean dry air.
- Petrochemical and Chemical Plants – Moisture management in process air lines.
- Electronics & Semiconductor Manufacturing – Ultra-dry air for production lines.
- Automotive and Engineering Sectors – For use with pneumaticing tools, paint booths, and assembly lines, etc.
- Textile, Paper, and Plastics – Mitigates any moisture issues related to products.
- Hospitals & Medical Gas Producing Facilities – For clean dry air, for oxygen and nitrogen systems.
What Makes Harsiddhi Air Solution the Best Option?
🏭 Indian National Industry Leader in PSA gas generation and air dryer systems.
✅ Quality assurance (ISO 9001:2015 & ISO 13485:2016 Certified).
⚙️ Custom made Engineering – Built to suit your specific flow, dew point and pressure needs.
⚡ Energy Performance – Lower operating costs, higher efficiency and performance.
🔧 Experienced After-Sales Service – installation, commissioning, and servicing anywhere in India.
🌱 Sustainable Technology – Less purge air and energy use for eco-friendly operation.
Frequently Asked Questions (FAQs)
Q1: What are the key benefits of an externally heated air dryer?
A: It is much more energy-efficient with much lower purge air losses than a heatless dryer. It is therefore more economical for applications where the cost of compressed air is a concern.
Q2: What kind of dew point can be achieved?
A: Standard models will give you -40°C, high efficiency models can achieve -60°C, and advanced models will allow for -60°C operation and below.
Q3: How is an externally heated dryer different from an internally heated dryer?
A: An externally heated dryer, the heater (or heating elements) is located outside of the vessel/tower of the dryer. This allows for more consistent heating, easier maintenance, and increased life of the desiccant.
Q4: What life can you expect from the desiccant material?
A: In general, the desiccant can last 2-4 years depending on the air quality and operating conditions before it needs to be replaced.
Q5: Can the dryer be automated?
A: Yes, all models include PLC or microprocessor-based controls to fully automate the drying and regeneration cycles.
Q6: What kinds of maintenance will I need to perform?
A: Regular inspections of filters, valves, heaters, and sensors, as well as periodic checks of the desiccant, will ensure a long-term effective drying process.
Q7: Which applications are these best suited for?
A: Medium to large industrial processes, especially where energy efficiency and low purge air losses are important.
Find the Ideal Air Drying Solution
If you are looking for a dependable, energy-efficient externally heated air dryer, Harsiddhi Air Solution can provide a suitable combination of performance, efficiency, and durability.
Location:
📍 B-26, Ved Industrial Park-2, Kathwada, Ahmedabad, India
📞Talk to Us: +91 9023435128
📧 Drop email: info@harsiddhiairsolution.com