Efficient Refrigerated Air Drying Solutions for Industrial Applications
As a professional air dryer manufacturer, we offer factory-direct supply with strict quality control from raw materials to finished products. Standard and customized designs are available to meet unique requirements. OEM and ODM partnerships are welcome, ensuring flexible and responsive service.
A refrigerated air dryer removes moisture from compressed air using the principle of refrigeration dehumidification. It employs a fully enclosed compression refrigeration system to cool the high-temperature, saturated compressed air discharged from the air compressor. As the air cools, water vapor and oil mist condense into liquid droplets, which are then removed through an air-water separator and automatic drain.
The incoming hot, saturated air first passes through a pre-cooler, where it exchanges heat with the outgoing cold dry air, lowering its temperature. It then enters the evaporator, where it undergoes further cooling by the refrigerant. This double-stage cooling causes moisture in the air to condense into water droplets. These droplets are separated and drained out automatically.
Finally, the cold, dry compressed air is reheated in the pre-cooler by the incoming air. This process raises its temperature slightly while reducing its relative humidity, resulting in dry air with a low dew point at the outlet.
◆ Good heat exchange performance and saving energy consumption required for refrigeration . The heat exchange performance of aluminum plate-fin heat exchanger is much greater than that of conventional shell and tube heat exchanger. The maximum temperature difference between the inlet and outlet of air can reach 2 ℃, which reduces the required cooling capacity and thus saves energy consumption of the dryer.
| Heat exchanger series | Inlet and outlet temperature difference ℃ | Save energy |
| High-end small flow heat exchanger | 5-7 | 20% |
| Conventional tube-fin heat exchanger | 15~20 | High energy consumption |
| Large flow heat exchanger | 3-5 | 30% |
◆ Larger heat exchange area : Aluminum plate-fin heat exchangers are composed of multiple layers of corrugated fins and partitions. The fin spacing is very small and the number of layers is large, so the heat exchange area is large and the heat exchanger structure is compact ;
◆Stainless steel wire mesh filtration separation
The air-water separation of aluminum plate-fin heat exchangers is mostly done by stainless steel wire mesh filtration separation, which has the advantages of simple structure and high air-water separation efficiency. The stainless steel wire mesh is generally made of SST304 material, which is strong and corrosion-resistant.
◆ The condensers all use internally threaded copper tubes, which increase the heat exchange efficiency by about 20% compared to the bare tubes used by other brands;
◆High-end and efficient refrigeration accessories : Models with a processing flow rate ≥1 1 .5Nm³/min adopt a constant pressure expansion valve design , and the equipment is equipped with a defrost valve to ensure that the equipment will not have ice blockage in the compressed air path . It has strong reliability and uses Shanghai Shangheng /Denmark Danfoss/US Emerson hot gas bypass valves to ensure that there is no ice in the system.
♦ Good heat exchange performance, saving refrigeration energy consumption
The heat exchange performance of the aluminum plate-fin heat exchanger is much greater than that of the conventional shell-and-tube heat exchanger. The air inlet and outlet temperature difference can reach 2°C, reducing the required refrigeration capacity, thereby saving the energy consumption of the dryer.
| Heat exchanger series | Inlet and outlet temperature difference ℃ | Save energy |
| High-end small flow heat exchanger | 5~7 | 20% |
| Conventional tube-fin heat exchanger | 15~20 | High energy consumption |
| Large flow heat exchanger | 3~5 | 30% |
♦ Large heat exchange area
Aluminum plate-fin heat exchangers are made of multiple layers of corrugated fins and partitions. The fin spacing is very small and the number of layers is large, so the heat exchange area is large and the heat exchanger structure is compact.
♦ Stainless steel wire mesh filtration separation
The air-water separation of aluminum plate-fin heat exchangers is mostly done by stainless steel wire mesh filtration separation, which has the advantages of simple structure and high air-water separation efficiency. Stainless steel wire mesh is generally made of SST304 material, which is strong and corrosion-resistant.
♦ High-end and efficient refrigeration accessories
The models with a processing flow rate of ≤13.5Nm³/min use a constant pressure expansion valve design, and the models with a processing flow rate of ≥17m³/min use a capillary tube as a throttling device design, which has strong reliability, ensuring a continuous supply of refrigerant inside the evaporator, and a constant evaporation temperature of 2-3°. Shanghai Fengshen/Danfoss/Emerson hot gas bypass valves are used to ensure that there is no icing in the system.
♦ Automatic cooling water regulation
Danfoss WXF series water flow regulating valves are used to automatically adjust the cooling water injection amount according to the refrigerant pressure inside the dryer to ensure constant pressure stability of the system and stable compressor load
♦ Three-dimensional optimization design reduces welding points of refrigerant pipelines
As shown in the three-dimensional figure below, the refrigerant inlet and outlet evaporator interface has been replaced by a locking process instead of welding. After years of optimization design, the welding points of the refrigerant external circulation pipeline have been reduced to 5. Compared with the shell and tube refrigeration dryer, which has more than a dozen welding points, the probability of refrigerant leakage is extremely low.
| Model | Power (KW) | Capacity （M3/min） | Interface size | Dimensions (mm) | Weight (KG) | Refrigerant |
|---|---|---|---|---|---|---|
| SLT-1.2-1.6 | 7.5 | 1.2 | G¾'' | 500*450*700 | 40 | R134A |
| SLT-1.6-1.6 | 11 | 1.6 | G¾'' | 500*450*700 | 45 | R134A |
| SLT-2.6-1.6 | 15 | 2.6 | G1" | 500*460*750 | 50 | R410A |
| SLT-3.8-1.6 | 22 | 3.8 | G 1½'' | 600*500*775 | 65 | R410A |
| SLT-6.5-1.6 | 37 | 6.5 | G 1½'' | 600*560*860 | 70 | R410A |
| SLT-8.5-1.6 | 55 | 8.5 | G2" | 620*550*910 | 85 | R410A |
| SLT-11.5-1.6 | 75 | 11.5 | G2" | 1200*632*1206 | 160 | R410A |
| SLT-13.5-1.6 | 90 | 13.5 | G2" | 1200*632*1206 | 160 | R410A |
| SLT-18.5-1.6 | 110 | 18.5 | G2½'' | 1200*720*1310 | 180 | R410A |
| SLT-20.5-1.6 | 132 | 20.5 | G3" | 1200*720*1310 | 210 | R410A |
| SLT-25-1.6 | 150 | 25 | G3" | 1200*720*1310 | 230 | R410A |
| SLT-35-1.6 | 185 | 35 | G4" | 1400*1000*1575 | 320 | R410A |
| SLT-45-1.6 | 220 | 45 | DN100 | 1400*1000*1575 | 350 | R410A |
| SLT-55-1.6 | 280 | 55 | DN125 | 1485*1030*1945 | 550 | R410A |
| SLT-65-1.6 | 355 | 65 | DN125 | 1485*1030*1945 | 600 | R410A |
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