Sizing an industrial air cooler for a large workshop is not simply a matter of choosing a model with the highest airflow. The equipment needs to match the workshop volume, heat load, ambient humidity, required air movement, installation height, and ventilation conditions.
For a large production hall, the right size is the one that can deliver sufficient airflow and cooling effect to the working area without creating an unsuitable airflow pattern or unnecessary operating capacity.
1. Define the Area That Actually Needs Cooling
Start by identifying the part of the workshop that requires cooling.
A large factory may contain:
- Production lines
- Assembly areas
- Machinery zones
- Raw material storage
- Finished-product storage
- Loading areas
- Offices or enclosed rooms
These areas do not necessarily have the same cooling requirements.
If only the production floor requires cooling, there is no reason to size the industrial air cooler system based on the entire building volume.
2. Calculate the Workshop Volume
Once the cooling area is defined, calculate its air volume:
Workshop Volume = Length × Width × Average Height
For example:
Length: 80 m
Width: 40 m
Average height: 8 m
The workshop volume is:
80 × 40 × 8 = 25,600 m³
This is more useful for sizing than floor area alone.
A 3,200 m² workshop with a 4 m ceiling contains 12,800 m³ of air, while the same floor area with an 8 m ceiling contains 25,600 m³.
The difference can significantly affect the required airflow.
3. Determine the Airflow Capacity Needed
The next step is to establish the approximate airflow requirement for the space.
A preliminary calculation is:
Required Airflow = Workshop Volume × Required Air Changes per Hour
The appropriate air-change rate depends on the workshop conditions, heat sources, ventilation arrangement, climate, and cooling objective.
For example, using a preliminary value of 20 air changes per hour:
25,600 m³ × 20 = 512,000 m³/h
This gives an estimated total airflow requirement of 512,000 m³/h.
The purpose of this calculation is to establish the scale of the cooling system. It does not automatically determine the final equipment model.
4. Match the Required Airflow With the Cooler Capacity
Industrial air coolers are available with different airflow capacities.
Suppose a selected model provides 20,000 m³/h.
For the example above:
512,000 ÷ 20,000 = 25.6
This indicates that approximately 26 units would be required based on the preliminary airflow calculation.
If another model provides 30,000 m³/h:
512,000 ÷ 30,000 = 17.1
The preliminary requirement would be approximately 18 units.
This illustrates an important point: equipment size and equipment quantity are closely related, but they are not the same design decision.
The final selection also needs to consider how the airflow will be distributed throughout the workshop.
5. Check the Heat Load
Airflow alone does not describe the cooling requirement of a large workshop.
A factory producing metal parts, operating welding stations, running injection molding machines, or using ovens may generate substantial internal heat.
Important heat sources include:
- Production machinery
- Electric motors
- Welding equipment
- Furnaces
- Ovens
- Compressors
- Dryers
- Lighting
- Workers
- Solar heat through the roof
If the main heat source is concentrated in one production zone, that area may require greater airflow or a more targeted cooling arrangement.
This is why a large workshop should be divided into practical cooling zones rather than treating every square meter identically.
6. Consider Ambient Temperature and Humidity
For an evaporative industrial air cooler, local weather conditions are an important part of sizing.
Evaporative cooling relies on the evaporation of water. The amount of cooling that can be achieved depends on the difference between the dry-bulb and wet-bulb temperatures.
Relative humidity therefore matters.
In hot, dry weather, evaporative cooling generally has greater potential.
In hot, humid weather, the temperature reduction is more limited.
When sizing an industrial air cooler, check the local summer:
- Dry-bulb temperature
- Relative humidity
- Wet-bulb temperature
- Daily operating conditions
- Seasonal temperature changes
A cooler that works effectively in a dry climate may require a different system arrangement in a humid climate.
7. Consider Ceiling Height and Installation Position
Large workshops often have high ceilings, and this can make equipment positioning particularly important.
A high airflow rating does not guarantee effective cooling at worker level if the cooled air does not reach the occupied zone.
Check:
- Mounting height
- Discharge direction
- Air velocity
- Distance from workers
- Roof structure
- Machinery height
- Storage racks
- Structural columns
For ceiling-mounted industrial air coolers, the installation height should be considered together with the discharge pattern.
8. Size the System Around Air Distribution
A large workshop may require multiple industrial air coolers rather than a few very high-capacity units.
For example, imagine a long production hall measuring 120 m × 30 m.
Even if several large units can provide the calculated total airflow, placing them in only one part of the building may result in:
- Hot areas at the opposite end
- Poor air circulation
- Excessive airflow near the units
- Uneven worker comfort
Multiple units positioned across the workshop can create a more balanced airflow path.
The important question is therefore not only:
"How much air can the equipment move?"
It is also:
"Where does that air go?"
9. Check the Ventilation Arrangement
Evaporative air coolers add cooled air to the workshop, so warm air and moisture need to leave.
Before finalizing the equipment size, check:
- Exhaust fans
- Roof vents
- Windows
- Doors
- Wall openings
- Natural ventilation
- Mechanical exhaust systems
A workshop with insufficient exhaust may not benefit from simply installing higher-capacity air coolers.
The cooling system and ventilation system should be considered together.
10. Consider Airflow Through the Production Area
Production equipment can significantly change the airflow pattern.
Large machines, storage racks, partitions, and walls may block or redirect air.
Before selecting the final cooler size, map the major obstructions and identify the actual occupied areas.
For a large workshop, the airflow path should generally be considered as:
Industrial Air Cooler → Working Zone → Heat Removal / Exhaust
This is particularly important when the production floor contains long rows of machinery.
11. Choose Between Larger and Smaller Air Coolers
A large workshop does not automatically need the largest individual industrial air cooler.
Suppose the calculated system airflow is approximately 300,000 m³/h.
Possible configurations could include:
10 × 30,000 m³/h
15 × 20,000 m³/h
20 × 15,000 m³/h
Each configuration provides approximately the same total airflow.
The practical choice depends on:
Workshop layout
Available installation locations
Cooling zones
Airflow direction
Maintenance access
Electrical supply
Water supply
Equipment cost
A larger number of smaller units may provide more flexibility for zoning, while larger units may be suitable where the building has fewer installation points.
12. Check Motor Power and Operating Requirements
The airflow capacity should also be considered together with motor power.
When comparing industrial air cooler models, check:
Airflow
Motor power
Fan type
Water consumption
Noise level
Electrical supply
Continuous operating requirements
A high-airflow model is not automatically the right choice if its operating requirements do not match the factory's available power supply or cooling strategy.
13. Consider Maintenance Access
Sizing also has a practical installation aspect.
Industrial air coolers installed in large workshops need routine inspection and cleaning. The installation location should allow technicians to access important components safely.
Consider access to:
Cooling pads
Water distribution system
Fan and motor
Water tank
Filters or screens
Electrical components
A theoretically suitable unit can become difficult to maintain if it is installed in a location with restricted access.
14. Large Workshop Sizing Example
Consider a production hall measuring:
80 m × 40 m × 8 m
Workshop volume
80 × 40 × 8 = 25,600 m³
Assume a preliminary requirement of 20 air changes per hour:
25,600 × 20 = 512,000 m³/h
Now compare two possible cooler capacities.
Option A
20,000 m³/h per unit
512,000 ÷ 20,000 = 25.6
Approximately 26 units would be required as a preliminary airflow-based calculation.
Option B
30,000 m³/h per unit
512,000 ÷ 30,000 = 17.1
Approximately 18 units would be required.
The two options provide different installation arrangements even though they are based on the same estimated total airflow.
The final choice should therefore be based on the workshop layout, heat distribution, installation height, ventilation, and local climate rather than airflow capacity alone.
15. Information Needed for Accurate Sizing
When requesting an industrial air cooler sizing proposal, provide:
- Workshop length
- Workshop width
- Average ceiling height
- Area requiring cooling
- Outdoor summer temperature
- Relative humidity
- Main heat sources
- Production equipment layout
- Number of workers
- Existing exhaust system
- Door and window locations
- Available electrical supply
- Water supply conditions
- Desired operating hours
Photos, floor plans, and equipment layouts can also help identify potential airflow obstructions and installation positions.
Industrial Air Cooler Sizing Checklist
Before selecting the equipment, check these seven areas:
Workshop volume - How much air needs to be moved?
Airflow requirement - How much air should the system supply?
Heat load - Where is heat being generated?
Humidity - Is evaporative cooling suitable for the local climate?
Air distribution - Can cooled air reach the working areas?
Ventilation - Can warm and humid air leave the building?
Installation conditions - Can the selected units be installed and maintained properly?
If these factors are considered together, the industrial air cooler can be sized according to the actual workshop rather than a simple floor-area rule.
Final Considerations
Sizing an industrial air cooler for a large workshop involves more than selecting a unit according to square meters. Workshop volume establishes the basic airflow requirement, while heat load, humidity, ventilation, ceiling height, and airflow distribution determine whether that airflow will work effectively in practice.
A practical sizing process is to calculate the workshop volume, estimate the required airflow, compare available cooler capacities, and then design the number and position of units around the factory's actual heat sources and working areas.
For a large workshop project, the factory dimensions, ceiling height, local temperature and humidity, heat sources, ventilation conditions, and production layout should be evaluated together before the final industrial air cooler model and quantity are selected.
