Compressed air dryer is as important to keep your air system running at peak efficiency

GSA’s compressed air dryer is highly reliable and efficient in use

HYD-N3 refrigerated air dryer series

Reduction of Energy Consumption

Generation-III, Energy-saving Refrigerated Air Dryer

Reduction of Energy Consumption
GSA’s cycling refrigerated air dryer is a latest energy-saving model which stores cooling energy, using phase change materials (PCMs) accumulated in a specially designed heat exchanger. It cools and freezes PCMs, using reserve cooling energy generated under no/low load and chills compressed air with accumulated latent heat. It reduces operating costs by stopping operation while such latent heat is burnt out and PCM temperature rises for a certain period of time.

Using a patented heat exchanger, the cycling refrigerated air dryer is able to store a huge amount of cooling energy, which cannot be done in regular refrigerated dryers. It can save energy in an innovative fashion. The heat exchanger of a standard refrigerated air dryer is comprised of an air-air heat exchanger and an air-refrigerant heat exchanger. However, the generation-III, cycling refrigerated dryer consists of three different parts: i) air-air heat exchanger, ii) air-PCM heat exchanger, iii) refrigerant-PCM heat exchanger. The above three heat exchangers in a PCM heat exchanger are connected to each other systematically. Made with the same material, they generate the best efficiency and performances. In addition, the cycling refrigerated air dryer has such high latent heat that it maximizes energy-saving efficiency, using high-purity alkane PCMs with which a large amount of cooling energy can be saved. With a refrigerant pressure transmitter, furthermore, it features various latest technologies and systems, optimizes the cooling system and enhances cooling efficiency, energy utility and user convenience.

Accumulated Heat Amount

The heat exchanger in the cycling refrigerated air dryer is capable of keeping up to 240,000 J/kg latent heat, using high-purity alkane PCMs. In addition, it can store a large amount of cooling energy and save energy in an efficient and innovative fashion if cooling energy stored in the aluminum heat exchanger is included.
Heat Exchanger Material Specific Heat (J/kg) Thermal Conductivity
PCM Latent Heat
Quantity of Heat
(1kg x △10℃)
Heat Storage Ratio
Shell & Tube Copper 389 332 N/A 3890 100%
Plate heat exchanger Stainless 464 14 N/A 4640 120%
Aluminum Block Aluminum 896 196 240000 8960 3300%

Energy Saving

Energy savings in HYD-N3 a refrigerated air dryer Series
Generation I (100%)
Energy-saving rates 100%
Generation II (Up to 50%)
Energy-saving rates 50%
Generation III (Up to 80%)
Energy-saving rates 20%

Energy-saving rates when both low-load and no-load conditions are considered

Highly Reliable Generation-III Energy-saving Dryer developed with the Latest Technologies

Generation-III Refrigerated Air Dryer with the Latest Innovative Technologies

aluminum PCM heat exchanger

High-efficiency Aluminum PCM Heat Exchanger

The patented GSA PCM heat exchanger is specially designed for efficient heat exchanging with compressed air, refrigerant and PCMs. With great cooling performances and efficiency, it reduces energy consumption innovatively. The high-efficiency aluminum heat exchanger has a larger heat-exchange area and greater performances than other types of heat exchangers such as shell & tube and plate ones. The internally accumulated high-purity PCMs reveal great cooling performances with high latent heat and offer stable dew points with good energy-saving efficiency. Made with the same material, in addition, the GSA air dryer has no thermal resistance and is free from heat exchanger freeze-up or corrosion.

zero loss drain

Highly Reliable Drain without Compressed Air Loss

As a separation space with thermister inside the heat exchanger, it shows great condensate separation efficiency. The isolated condensate is discharged through the magnetic float-mounted auto drain. A zero-loss drain adopting either a magnetic float or level sensor depending on a product ensures great operating performances and minimizes performance drop or failure in the drain caused by oil, dirt and various contaminants.

low differential pressure

Minimization of Compressed Air Loss with Low Differential Pressure

We minimized differential pressure with a large heat-exchange area and sufficient cross section for the passage of compressed air. We enhanced heat-exchange efficiency and reduced differential pressure by minimizing resistance, making it possible to operate the compressed air system more efficiently at lower costs.

Smart and Simple Controller

Smart Controller with Diverse Latest Technologies

A multifunctional controller featuring a 4.3” TFT color touch panel offers an intuitive interface through which users are able to check current operations and energy-saving status easily. In addition, if mobile communication features are added, it is possible to check current operations and diverse information and features through WIFI and BT. Users are also able to check the system near the system or in the distance through an Android app, using an intranet.

energy saving PCM

Maximization of Energy-saving Effects through High-purity/High-efficiency PCMs

The PCM refrigerated dryer maximized energy efficiency, using high-purity alkane PCMs. Compared to others, the high-purity alkane PCMs are able to store more energy with high latent heat. In addition, they are durable and have a stable phase change cycle. In addition, they maximize the super cooling- and corrosion-free properties of an aluminum heat exchanger and ensure stable operation and performances.

High efficiency condenser

Efficiency Maximization with High-efficiency Condenser

For stable performances even under unfavorable circumstances such as high temperature, grooved cooper tube and corrugated split fin were applied. Since they are expanded in a complete and uniform manner, fin adhesion is high, applying condensate with a high coefficient of heat transfer. Therefore, it guarantees stable operations under diverse environments including hot temperature.

Technical Specification

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 either R-134a or R-22 refrigerant. Other models adopting different types of refrigerants are also available.
  • The flow rate is based on 60Hz.
  • Other electrical specifications are also available.
  • A unit with 15barg or higher operating pressure is customizable.
  • Large models bigger than those stated in the specifications are also customizable.
  • The specifications are subject to changes without notice for product improvement.
HYD-N3 series ​
• (The electrical energy stated above is calculated based on 50% load. Therefore, it can differ depending on operating situations.)
Model Connection Air Compressor Flow Rate Minimum Electrical Energy Power Supply Dimensions Weight
A HP N㎥/min kW V / Ph / Hz A B C kg
30N3 PT 25A 30 3.9 0.45 220 / 1 /
50, 60
360 700 950 70
50N3 PT 40A 50 6.7 0.7 410 710 1050 100
100N3 PT 50A 100 14.2 1.17 380 / 3 /
460 900 1250 140
150N3 PT 65A 150 21 1.45 570 1050 1400 180
200N3 FLG. 80A 200 30 2.09 750 1250 1460 260
300N3 FLG. 100A 300 47 2.3 850 1350 1650 290
400N3 FLG. 100A 400 56 4.85 1200 1500 1750 680
500N3 FLG. 150A 500 66 6.52 1800 1750 1850 980
600N3 FLG. 150A 600 85 7.72 1800 1750 1850 1120

Correction Factors

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 Models)
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