1. Matching Core Parameters (Mandatory Calculation)

1.1 Processing Airflow Rate (Most Critical)

• ●Formula: Rated airflow of refrigerated dryer = Exhaust volume of air compressor × (1.1 ~ 1.2)
• ●Example: A 10 m³/min air compressor shall be matched with a refrigerated dryer of 11–12 m³/min.
• ●For high temperature and high humidity environments, adopt a multiplier of 1.2–1.3.

1.2 Inlet Air Temperature (Determine Dryer Type)

• ●Standard type: Inlet air temperature ≤ 45°C (screw compressors equipped with aftercoolers have an exhaust temperature of around 40°C).
• ●High-temperature type: Inlet air temperature 45–80°C (applicable to units without aftercoolers, poor heat dissipation in summer or long pipelines).

1.3 Working Pressure (Required Matching)

• ●Common operating range: 0.6–1.0 MPa (0.7–0.8 MPa for regular use).
• ●Pressure correction: Higher working pressure increases air density and reduces water content, which improves the actual processing capacity of the dryer.
• ●Low pressure (< 0.6 MPa): Select special low-pressure models.
• ●High pressure (> 1.3 MPa): Adopt customized high-pressure dryers.

1.4 Pressure Dew Point (Indicator of Drying Performance)

• ●Conventional range for refrigerated dryers: 2–10°C (atmospheric dew point approx. -5 ~ +5°C).
• ●General machinery & pneumatic tools: 10°C.
• ●Spraying & electronic assembly: 3–5°C.
• ●Precision instruments, food & pharmaceutical industries: Stable dew point at 2°C.

2. Selection of Cooling Methods (Air-Cooled / Water-Cooled)

2.1 Air-Cooled Type (Recommended for Most Scenarios)

• ●Application: Areas with insufficient water supply, no circulating cooling water system, or ambient temperature ≤ 38°C.
• ●Advantages: Easy installation, no water pipeline required, simple maintenance and low cost.
• ●Disadvantages: Performance drops when ambient temperature exceeds 38°C; relatively higher operating noise.

2.2 Water-Cooled Type (Preferred for High Temperature & Large Flow Rate)

• ●Application: Ambient temperature above 38°C, multiple air compressors in operation, large airflow rate (> 10 m³/min) or low noise requirements.
• ●Advantages: Stable heat dissipation, high working efficiency, low noise and steady dew point in summer.
• ●Disadvantages: Requires cooling water (temperature: 5–40°C, pressure: 0.2–0.7 MPa), complicated installation and additional maintenance costs.

3. Correction for Ambient Conditions & Operating Conditions

• ●Ambient temperature: Choose water-cooled models or upsize the capacity by one grade if ambient temperature > 38°C; take anti-freezing measures when temperature < 5°C.
• ●Altitude: Upsize the airflow capacity by 10%–20% for areas above 1000 meters above sea level due to thin air.
• ●Multiple compressors in parallel: One large centralized dryer is more energy-efficient and easier to maintain than multiple small dryers.

4. Quick Selection Procedures (Direct Application)

1. ●Check the nameplate of the air compressor: exhaust volume (m³/min), working pressure (MPa) and exhaust temperature (°C).
2. ●Calculate airflow rate: Multiply the exhaust volume by 1.1–1.2 to get the required rated airflow of the dryer.
3. ●Confirm model type: Standard type for inlet air ≤ 45°C; high-temperature type for inlet air > 45°C.
4. ●Select cooling mode: Air-cooled for water shortage and normal temperature; water-cooled for high temperature and large flow rate.
5. ●Verify dew point: Select 2–10°C according to process requirements.
6. ●Reserve extra capacity: Increase the airflow rate by another 10% for high temperature, high humidity or high-altitude environments.

5. Reference Matching Table (7–132 kW Screw Air Compressors)