Your Go-To Refrigerated Air Dryer Manufacturer for Efficiency and Performance
- The aluminum plate fin structure provides a larger heat exchange area, allowing for efficient heat transfer within a compact size
- Compared to traditional shell-and-tube heat exchangers, the aluminum plate fin design is more compact and saves space.
- Easy maintenance and longer component replacement intervals help reduce long-term operational costs
- Seamlessly integrates with different compressor models and industrial equipment
The aluminum plate-fin heat exchanger is designed and processed with aluminum-magnesium alloy materials. Due to its superior heat exchange efficiency, it only needs a smaller cooling capacity to meet the design requirements when applied to the refrigerated dryer. Compared with the shell and tube refrigerated dryer, its cooling capacity requirement is about 25% less. After the overall heat exchanger is processed, a helium leak test will be carried out, and its process can control the leakage rate to the lowest.
The heat exchanger is made of aluminum-magnesium alloy, so it will not cause rust or corrosion on the inner wall of the pipe, avoiding secondary pollution of the compressed air.
Under the high working efficiency of aluminum plate-fin heat exchanger, the maximum design temperature difference of air inlet and outlet can reach 3℃. The original cooling capacity with the cooling of outlet air can avoid loss, so the cooling demand is smaller than that of shell and tube heat exchanger. Therefore, the electric energy consumption required for the plate-fin heat exchanger is small, and the energy consumption can be saved by 25% compared with shell and tube cold dryer.
The high-horsepower model is designed with multiple heat exchangers assembled in parallel. Since standard identical components are used, installation and maintenance are very convenient, thus reducing the maintenance cost of the equipment.
The heat dissipation design is a top-mounted external rotor fan suction type, which better caters to the user’s on-site heat dissipation device installation and high-temperature problems in the on-site environment.
The whole machine seal adopts thickened sheet metal anda precise integrated processing method to ensure the beauty of the model and the controllability of transportation. The sheet metal is processed by pickling, degreasing, phosphating, high-temperature baking paint and other processes to ensure the service life of the equipment.
♦ 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 |
Basic knowledge of refrigerated dryer
Refrigerated Air Dryer is a device commonly used in industrial gas processing systems. Its main function is to remove moisture from compressed air to prevent moisture in the compressed air from causing equipment corrosion, icing or reducing work efficiency. It condenses and discharges moisture in the air by cooling it down, thus ensuring that the compressed air remains dry.
Working principle of refrigerated dryer
The working principle of refrigerated dryer is mainly to cool the compressed air, condense the water vapor in it into liquid water, and discharge it outside the machine through the automatic drainage system, so as to achieve the purpose of drying. Specifically, the refrigerated dryer uses the refrigerant to exchange heat with the compressed air to reduce the temperature of the compressed air to the dew point temperature range of 2 to 10°C. In this process, most of the water vapor is cooled and condensed into liquid water, thereby reducing the moisture content in the compressed air.
The refrigerated dryer is mainly composed of evaporator, condenser and expansion valve. The evaporator is the main heat exchange component, in which the compressed air is forced to cool, and the water vapor condenses into liquid water and is discharged outside the machine. The condenser cools the high-pressure, superheated refrigerant vapor discharged from the refrigerant compressor into liquid refrigerant, taking away the heat. The expansion valve is the throttling mechanism of the refrigeration system, which ensures that the refrigerant absorbs the surrounding heat during the phase change in the evaporator and further cools the compressed air.
Refrigerated dryers are widely used, mainly for air source processing in industrial production. They can provide clean and dry compressed air and are suitable for occasions requiring high-quality air sources.
Main Components
The main components of a refrigerated air dryer include the following, each of which plays a vital role in ensuring the dryer functions efficiently:
- Compressed Air Inlet:
- Function: This is where the compressed air enters the dryer. The air is then directed into the cooling system for treatment.
- Evaporator:
- Function: The evaporator is the core component of the refrigerated air dryer. It uses refrigerants (such as R-134a, R-404A, etc.) to absorb heat from the incoming air, lowering the temperature of the air so that moisture condenses into water droplets.
- Working Principle: The evaporator cools the compressed air, causing water vapor to condense into liquid water.
- Refrigeration System (Compressor, Condenser, Expansion Valve):
- Function: The refrigeration system enables cooling by circulating refrigerant. It consists of:
- Compressor: Compresses the refrigerant, raising its temperature and pressure.
- Condenser: Cools the compressed refrigerant and releases heat through a heat exchanger.
- Expansion Valve: Reduces the pressure and temperature of the refrigerant, allowing it to absorb heat from the incoming air.
- Function: The refrigeration system enables cooling by circulating refrigerant. It consists of:
- Water Separator:
- Function: During the cooling process, water vapor condenses into liquid water. The water separator effectively separates and collects this condensed water to prevent it from entering downstream equipment.
- Types: Water separators can be manual or automatic for draining.
- Condensate Drainage System:
- Function: This system automatically or manually drains the condensed water to ensure that excess water does not accumulate inside the dryer, which could affect its performance. Common drainage systems include:
- Automatic Drain Valve: Automatically discharges accumulated condensate at regular intervals.
- Manual Drain Valve: Requires manual operation to drain the water.
- Function: This system automatically or manually drains the condensed water to ensure that excess water does not accumulate inside the dryer, which could affect its performance. Common drainage systems include:
- Heat Exchanger:
- Function: The heat exchanger facilitates efficient heat transfer, both to cool the air and to exchange heat between the refrigerant and the air, making the cooling process more efficient.
- Design: Heat exchangers typically come in plate-type or tube-type designs.
- Temperature Controller:
- Function: This component monitors and adjusts the internal temperature of the dryer to ensure it stays within an optimal operating range, preventing overheating or undercooling.
- Compressed Air Outlet:
- Function: After the air is dried and cooled, it exits through this outlet to be used by the downstream equipment or system, ensuring that the air is free of moisture.
- Refrigerant Circulation Piping:
- Function: This network of pipes connects the components of the refrigeration system, allowing the refrigerant to flow through the compressor, evaporator, condenser, and expansion valve to complete its cycle.
These components work together to ensure that the refrigerated air dryer efficiently and reliably removes moisture from the compressed air, providing clean, dry air for industrial and commercial applications.
Advantages of Refrigerated Dryer
The advantages of Refrigerated Air Dryers include:
- Efficient Moisture Removal: Refrigerated air dryers use a cooling system to condense moisture from compressed air into liquid water, effectively removing moisture and preventing corrosion or efficiency loss in equipment caused by excess moisture.
- Energy-Saving and Eco-Friendly: Compared to other drying technologies, refrigerated air dryers consume less energy and do not require large amounts of drying media or chemicals, which reduces operational costs and environmental impact.
- Low Maintenance: Refrigerated air dryers have a relatively simple structure, usually consisting of a cooler, compressor, and drainage system. They require minimal maintenance and have a long operational lifespan.
- Versatility: These dryers are suitable for a wide range of industrial applications, particularly in environments where lower humidity is required, such as painting, food processing, and electronics manufacturing.
- Stable Operation: Refrigerated air dryers typically offer stable performance, providing consistent moisture removal even during extended operation.
- Cost-Effective: Compared to adsorption dryers, refrigerated air dryers generally have lower purchase and maintenance costs. They are a cost-effective choice for applications that do not require extremely low humidity levels.
- Automatic Drainage: Many refrigerated air dryers come with an automatic drainage feature, ensuring that the system remains in optimal working condition and further improving convenience for users.
Factors to consider when choosing a refrigerated dryer
When choosing a refrigerated dryer, the first thing to consider is the air flow and demand. Make sure the dryer capacity matches the air flow of the system to avoid oversized or undersized equipment, which affects efficiency and energy consumption. In addition, the compressor outlet temperature is also a key factor. Refrigerated dryers are usually suitable for compressed air with higher temperatures, so you need to ensure that the selected dryer can effectively handle the required compressed air outlet temperature.
The operating environment temperature also affects the choice of refrigerated dryer. Most refrigerated dryers have a limited operating environment temperature range. If the operating environment temperature is high or low, you may need to choose a specially designed device. Energy efficiency is another important consideration. Choosing equipment with a high energy efficiency ratio (EER) can help reduce operating costs and energy consumption, and some efficient heat exchange systems can further improve energy efficiency.
Humidity control is the core function of the refrigerated dryer. It is crucial to ensure that the dryer can effectively remove moisture from the compressed air and meet the needs of the system. According to actual needs, refrigerated dryers are available in two types: air-cooled and water-cooled. Air-cooled types are suitable for places with limited space, while water-cooled types are suitable for large flow and high efficiency needs.
Equipment maintenance and upkeep are also an important consideration. Choosing equipment that is easy to maintain and has low maintenance costs can reduce the complexity and cost of later use. Some refrigerated dryers are also designed with self-cleaning functions, which is very helpful in reducing manual intervention and maintenance costs. The type of refrigeration compressor and refrigeration system should also be carefully selected. A high-quality refrigeration system can ensure the stability and long-term performance of the equipment.
The filtration system is also a factor that cannot be ignored. Many refrigerated dryers are equipped with filters that can remove particulate matter and oil from the air to ensure the normal operation of the equipment and system. Finally, cost and budget must be taken into account. Although high-efficiency equipment may have a higher initial investment, its long-term energy saving and low maintenance costs can bring better economic benefits. When choosing, the reliability and reputation of the brand are also very important. Equipment from well-known brands is often of better quality and has more complete after-sales service.
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