The number of industrial air coolers a factory needs depends on more than the floor area. Workshop volume, required airflow, heat sources, ceiling height, ventilation, and the airflow capacity of each cooler all affect the final quantity.
A simple calculation can provide a preliminary number of units, but the final arrangement should also consider where heat is generated and how cooled air will move through the factory.
1. Start with the Required Total Airflow
The first step is to estimate the total airflow required for the workshop.
A basic calculation is:
Required Airflow (m³/h) = Workshop Volume (m³) × Required Air Changes per Hour
Workshop volume is calculated as:
Length × Width × Average Height
For example, a factory measuring 50 m × 30 m with an average ceiling height of 8 m has a volume of:
50 × 30 × 8 = 12,000 m³
If the preliminary design uses 20 air changes per hour:
12,000 × 20 = 240,000 m³/h
The factory would therefore require approximately 240,000 m³/h of total airflow as a starting point.
The appropriate air-change rate depends on the actual application and should be evaluated together with heat load and ventilation conditions.
2. Divide the Required Airflow by the Airflow per Unit
Once the total airflow is known, the preliminary number of industrial air coolers can be calculated.
Number of Air Coolers = Required Total Airflow ÷ Airflow per Cooler
For example:
Required total airflow: 240,000 m³/h
Airflow per cooler: 20,000 m³/h
Then:
240,000 ÷ 20,000 = 12
The preliminary requirement is therefore 12 industrial air coolers.
If the selected model provides 15,000 m³/h instead, the calculation becomes:
240,000 ÷ 15,000 = 16
The same factory would require more units because each cooler supplies less airflow.
3. Why Floor Area Alone Is Not Enough
A common approach is to calculate the number of coolers according to factory floor area.
For example:
One air cooler for every 100 m².
This can produce very different results in buildings with different ceiling heights.
Consider two factories with the same 2,000 m² floor area:
| Factory | Average Height | Air Volume |
|---|---|---|
| Factory A | 4 m | 8,000 m³ |
| Factory B | 10 m | 20,000 m³ |
The floor area is identical, but Factory B has 2.5 times the air volume.
Therefore, a reliable industrial air cooler calculation should consider cubic volume rather than square meters alone.
4. Consider the Factory's Heat Load
Airflow requirements can change significantly when the factory contains substantial internal heat sources.
Examples include:
- Welding equipment
- Furnaces
- Ovens
- Injection molding machines
- Compressors
- Motors
- Drying equipment
- High-temperature production lines
A factory with heavy machinery and continuous heat generation may require a different cooling arrangement from a warehouse with relatively low internal heat gain.
If heat is concentrated in one production area, adding the same number of coolers throughout the entire building may not be the most appropriate arrangement.
The equipment should be positioned according to the actual heat distribution.
5. Check the Ceiling Height
Ceiling height affects both the total air volume and the way cooled air reaches the working area.
In a high-ceiling workshop, simply increasing airflow may not guarantee better cooling at floor level.
The design should consider:
- Mounting height
- Air discharge direction
- Air velocity
- Distance between coolers
- Machinery height
- Roof structure
- Worker locations
For ceiling-mounted industrial air coolers, installation height and discharge direction are particularly important because the airflow must reach the occupied zone effectively.
6. Look at Airflow Distribution
Suppose a factory requires 240,000 m³/h and 12 coolers are selected.
There are several ways to arrange the units.
If all 12 units are concentrated near one side of the building, the total airflow may meet the calculated requirement, but distant areas can remain hot.
A better layout distributes airflow according to:
Cooling Unit → Production Area → Warm Air Removal
The location of doors, windows, exhaust fans, machinery, storage racks, and internal partitions should therefore be considered before deciding the final number and position of units.
7. Consider Ventilation and Exhaust
Evaporative industrial air coolers introduce cooled air into the factory. Warm air and additional moisture need to leave the building.
This means the number of cooling units should be considered together with the available ventilation.
Check whether the factory has:
- Roof vents
- Exhaust fans
- Open doors
- Windows
- Wall openings
- Mechanical ventilation
If the building cannot remove warm and humid air effectively, installing additional evaporative air coolers may not produce proportional cooling improvements.
8. Consider Local Temperature and Humidity
An evaporative air cooler does not produce the same cooling effect under all weather conditions.
Dry air provides greater evaporation potential, while high relative humidity reduces the available cooling potential.
For this reason, the equipment quantity should be evaluated using the local summer conditions, including:
- Outdoor temperature
- Relative humidity
- Wet bulb temperature
- Seasonal operating conditions
A factory located in a hot, dry climate may require a different configuration from one operating in a hot, humid climate, even when the two buildings have identical dimensions.
9. Do You Need More Smaller Units or Fewer Larger Units?
The total airflow requirement does not necessarily determine the final configuration by itself.
For example, a factory may require 240,000 m³/h.
This could theoretically be supplied by:
- 10 units × 24,000 m³/h
- 12 units × 20,000 m³/h
- 16 units × 15,000 m³/h
All three combinations provide approximately the same total airflow.
However, the practical choice depends on the building layout.
More units can provide greater flexibility in distributing airflow between different production zones, while larger units may simplify installation where the workshop has a suitable layout.
The selection should therefore balance airflow capacity, installation positions, cooling zones, maintenance access, and project cost.
10. Example: Calculating the Number of Air Coolers for a Factory
Consider a production workshop with:
Length: 60 m
Width: 40 m
Average height: 8 m
Step 1: Calculate air volume
60 × 40 × 8 = 19,200 m³
Step 2: Estimate required airflow
Assume a preliminary design value of 20 air changes per hour:
19,200 × 20 = 384,000 m³/h
Step 3: Select the cooler airflow
Suppose one industrial air cooler provides:
24,000 m³/h
Step 4: Calculate the number of units
384,000 ÷ 24,000 = 16 units
The preliminary calculation therefore gives 16 industrial air coolers.
The actual project design should then verify whether 16 units provide suitable air distribution and whether the local climate, heat sources, ventilation, and installation conditions support the proposed arrangement.
11. When the Calculated Number May Need Adjustment
The calculated number of industrial air coolers is not necessarily the final order quantity.
An adjustment may be required when the factory has:
Very high internal heat loads
Large differences in temperature between production zones
Extremely high ceilings
Restricted ventilation
Large machinery blocking airflow
Multiple independent workshops
Areas that require different cooling levels
Conversely, areas that do not require cooling do not necessarily need to be included in the calculation.
For example, an office, storage room, or enclosed process area may require a different cooling solution from a large open production hall.
12. Information Needed to Determine the Final Quantity
For an industrial air cooler project, a supplier or HVAC engineer will normally need:
Factory length and width
Average ceiling height
Area requiring cooling
Local summer temperature
Relative humidity
Main heat sources
Production equipment layout
Number of workers
Existing ventilation
Exhaust fan locations
Door and window positions
Available water supply
Available electrical supply
Required operating hours
The more accurately these conditions are defined, the more reliable the equipment quantity and layout calculation will be.
Industrial Air Cooler Quantity: Key Formula
For a preliminary estimate, use:
Workshop Volume = Length × Width × Average Height
Required Airflow = Workshop Volume × Required Air Changes per Hour
Number of Industrial Air Coolers = Required Airflow ÷ Airflow per Unit
Always round the calculated result up to a practical whole number of units, then check the layout and operating conditions before finalizing the equipment selection.
Final Considerations
There is no universal rule such as "one industrial air cooler for every 100 m² of factory space." The correct number depends on the total air volume, required airflow, heat load, ceiling height, humidity, ventilation, and airflow distribution.
For a preliminary project estimate, calculate the workshop volume, determine the required total airflow, and divide it by the rated airflow of the selected industrial air cooler. The resulting quantity is a starting point for system design, not a substitute for checking the actual factory conditions.
For an accurate industrial air cooler proposal, the factory dimensions, ceiling height, local climate, heat sources, ventilation arrangement, and production layout should be evaluated together.
