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Energy saving by generation-II refrigerated air dryer

Generation-II, Energy-saving, Refrigerated Air Dryer

Generation-II, Energy-saving, Refrigerated Air DryerGSA’s generation-II, energy-saving refrigerated air dryer is a cycling system designed to save energy in a simple and efficient fashion. It is relatively simple, compact and highly reliable compared to products which use variable-speed drive (VSD) designed to control the RPM of the refrigerant compressor and a brushless DC (BLDC) motor or those with phase change materials (PCM) or thermal mass.

The aluminum heat exchanger of the generation-II, energy-saving refrigerated air dryer plays a role of thermal mass which has great heat transfer performances. Since the product is made with a single material, it has no thermal resistance. Therefore, cooling energy stored in the heat exchanger can be utilized efficiently. It generates the greatest efficiency at the lowest costs when load is low or the compressed air use pattern is intermittent with a long length of time by maximizing the use of cooling energy accumulated in the heat exchanger.

Stored Heat of Aluminum Heat Exchanger

Compared to other heat exchangers, an aluminum heat exchanger is greater in terms of accumulated heat under the same mass due to high specific heat. With greatthermal conductivity, it displays great cooling effects of compressed air with high and stable dew points. Under same mass, the machine is 2.3 times and 1.9 times greater than copper and stainless steel respectively in terms of cooling capacity. With great thermal conductivity, furthermore, it ensures stable operation according to load changes.

Heat Exchanger Materia Specific Heat (J/kg) Thermal Conductivity
TherHeat Capacity
(Based on 1kg x △10℃)
Ratio of Heat Storage
Shell & Tube Copper 389 332 3890 100%
Plate heat exchanger Stainless 464 14 4640 120%
Aluminum Block Aluminum 896 196 8960 230%

Comparison of Operating Costs for Decade

Initial Purchase Costs
Non Cycling Type
2nd Generation Cycling Type
Non Cycling Type
2nd Generation Cycling Type
Management Costs
Non Cycling Type
2nd Generation Cycling Type
Installation Costs
Non Cycling Type
2nd Generation Cycling Type
Non Cycling Type
2nd Generation Cycling Type

Highly reliable generation-II, energy-saving dryer

Features of the machine built with diverse innovative technologies

aluminum heat exchanger

High-efficiency Aluminum Heat Exchanger

With a high-efficiency aluminum heat exchanger, GSA refrigerated air dryer offer larger heat-exchange area and performance guarantees of stable dew point than any other brands adopting other types of heat exchangers such as shell & tube and plate ones. Made with a single material, it has no thermal resistance and a little risk of corrosion or freezing burst.


Efficient Condensate Separation Technology

It separates a large amount of condensate produced during heat exchange efficiently by increasing the volume of a separator. Therefore, this machine offers stable performances and dew points even under diverse load and pressure conditions.

low differential pressure

Minimizing the loss of compressed air with low differential pressure

The occurrence of differential pressure was minimized by offing a large heat-exchange area and a sufficient cross-sectional area for compressed air flow. The efficiency of the compressed air system can be enhanced due to low differential pressure after increasing heat-exchange efficiency and minimizing resistance. In addition, operating costs can be reduced.

smart controller

Simple and Smart Controller

The simple but functional controller helps users observe the exact dew point and check energy-saving status through the ECO lamp. In addition, this multifunctional controller offers a 4.3” color TFT touch panel (optional) and various mobile communication features such as WiFi and BT.

zero loss drain

Highly reliable drain without loss of compressed air

The efficiency of compressed air facilities was enhanced by applying a magnetic float-integrated AUTO DRAIN which guarantees no loss of compressed air. The magnetic float ensures great operating performances. In addition, decrease in drain performances or failure resulting from oil or diverse substances in the air was minimized.

High efficiency condenser

Efficiency maximization with the use of a high-efficiency condenser

To ensure stable performances at high temperature or under unfavorable circumstances, grooved copper tube and corrugated split fin were applied. In addition, a condenser which has a high coefficient of heat transfer due to great fin adhesion after complete and uniform tube expansion was adopted. Therefore, it ensures stable operation in diverse situations such as a high-temperature region.

Technical Specification Table

Design Conditions

  • Inlet Pressure: 7 barg
  • Inlet Temperature: 38℃
  • Pressure Dew Point: 2-10℃
  • Design Pressure: 14 barg
  • Design Temperature: 70℃
  • Ambient Temperature: 32℃


  • All models use R-134a and R-22. We can also offer other alternative refrigerant specifications.
  • The flow rate is set at 60Hz.
  • It can be custom-ordered if electrical specifications are different.
  • It can be custom-made if operating pressure is 15barg or higher.
  • Large models above the specifications can also be provided.
  • Specifications are subject to changes without notice for quality improvement.
HYD N3 series ​
• (The electric energy in the above table is calculated under a 50% load factor. It may differ depending on operating circumstances.)
Model No. Connection
Air Compressor
Flow Rate Minimum Electric
Dimensions Weight
A HP N㎥/min kW V / Ph / Hz A B C kg
5N2 PT 15A 5 0.5 0.3 220 / 1 / 50, 60 247 557 723 36
7N2 PT 15A 7 0.8 0.31 247 557 723 36
10N2 PT 20A 10 1 0.32 247 557 723 36
15N2 PT 25A 15 1.5 0.48 428 508 709 45
20N2 PT 25A 20 2.6 0.56 428 508 709 45
30N2 PT 25A 30 3.9 0.9 358 658 864 66
50N2 PT 40A 50 6.7 1.4 408 708 952 89
75N2 PT 50A 75 10.5 2.1 458 798 1045 120
100N2 PT 50A 100 14.2 2.3 380 / 3 /
458 858 1145 126
150N2 PT 65A 150 21 2.9(2.5) 565 1005 1330 172
200N2 FLG. 80A 200 30 4.18(3.78) 550 1200 1447 240
250N2 FLG. 100A 250 39 4.4(4) 700 1200 1580 260
300N2 FLG. 100A 300 47 4.6(4.2) 700 1200 1580 270
400N2 FLG. 100A 400 56 9.7(8.9) 900 1591 1915 600

Capacity Correction Factor

Correction Factor by Inlet Air Temperature
Inlet Air Temperature (℃) 28 33 38 43 48 53 58 63 68 70 N/A N/A
Correction Factor 1.46 1.20 1.00 0.85 0.73 0.63 0.55 0.48 0.42 0.40 N/A N/A
Correction Factor by Inlet Air Pressure
Inlet Air Pressure (barg) 4 5 6 7 8 9 10 11 12 13 14 15
Correction Factor 0.84 0.90 0.95 1.00 1.03 1.06 1.09 1.11 1.13 1.15 1.17 1.18
Correction Factor by Ambient Temperature (Air-cooled Machine)
Ambient Temperature (℃) 27 32 37 40 45 50 N/A N/A N/A N/A N/A N/A
Correction Factor 1.05 1.00 0.92 0.82 0.76 0.69 N/A N/A N/A N/A N/A
Certification mark