How to determine EFU air volume? What should the EFU wind speed be set to?
When choosing an EFU, customers often ask directly:
'How much air volume does this EFU have?'
or:
'What is the wind speed of EFU?'
These two questions seem simple, but in fact they cannot give a unified answer directly without the specific equipment.
Because the air volume and wind speed of EFU need to be combined:
Internal space of the equipment, air supply area, filters, fans, air pressure and actual process requirements
Make sure.
Therefore, a more reasonable way to select EFU is not to first find a product with a fixed air volume, but to first clarify what air supply conditions the equipment requires.
3. What is EFU air volume?
EFU air volume, simply put, is:
The volume of air delivered by EFU per unit time.
Common units include:
m³/h
m³/min
CFM
wait.
For example, the rated air volume of an EFU is within a certain range, which does not mean that this air volume can be maintained under all circumstances.
Because the actual air volume will also be affected by:
Filter resistance, system resistance, fan performance and operating speed
and other factors.
Therefore, when checking the EFU air volume, you need to pay attention to both the test conditions and the corresponding wind pressure.
4. What is EFU wind speed?
Wind speed refers to the speed at which air moves.
In EFU applications, what usually needs attention is:
The speed of air passing through the filter and out of the outlet area.
Common units for wind speed are:
m/s
But something to note here:
The air speed inside the fan, the wind speed on the filter surface and the wind speed in the EFU outlet area are not exactly the same concept.
Therefore, it is best to be clear when communicating technically:
Where is the specific measurement of the 'wind speed' mentioned?
5. What is the relationship between EFU air volume and wind speed?
There is a direct relationship between the two.
A simple relationship is:
Q = V × A
in:
Q = air volume
V = average wind speed
A = effective air supply area
For example, when the effective air supply area is certain:
As the wind speed increases, the required air volume will also increase.
Conversely, if the air volume remains unchanged and the air supply area expands, the average wind speed may decrease.
Therefore, the EFU cannot determine the wind speed independently of the air supply area.
6. Is the higher the wind speed, the better?
no.
EFU does not mean that the higher the wind speed, the better.
If the wind speed is too low, the air supply requirements of the equipment may not be met.
But if the wind speed is too high, it may also bring:
Therefore, a more reasonable way is:
Determine the target wind speed based on the actual process requirements of the equipment.
7. Is the bigger the air volume, the better?
Likewise not.
The EFU air volume needs to match the actual needs of the equipment.
For example, only a certain amount of air supply is required inside the equipment. If the EFU is operated at an air volume significantly higher than the actual demand for a long time, unnecessary energy consumption may be caused.
Therefore need to consider:
Equipment internal space
Air supply area
target wind speed
filter resistance
Equipment process
and other factors.
8. How should the EFU air volume be determined?
It can usually be determined according to the following ideas.
Step 1: Determine the air supply area
First confirm how large an area the EFU needs to provide air to.
For example:
a local process area
or:
The entire internal space of the device
Step 2: Determine target wind speed
Determine the target wind speed based on equipment technology and cleanliness requirements.
For example:
A certain stable air flow speed needs to be maintained inside the equipment.
This parameter is best provided by the equipment designer or process personnel.
Step 3: Determine the effective air supply area
Determine the actual effective area through which air passes.
Then you can pass:
Air volume = wind speed × effective area
Make a preliminary estimate.
Step Four: Consider Filter Resistance
This is a very important step in actual EFU design.
Because air will create resistance when passing through a HEPA or ULPA filter.
Therefore, it is necessary to determine the actual wind pressure that the fan needs to provide in combination with the filter resistance.
Step 5: Match the fan and motor
Final basis:
Target air volume + target air pressure
Choose the right fan.
Then select the matching motor according to the fan operating point.
9. Why may the air volume be different for the same EFU size?
Because the EFU external dimensions are the same, it does not mean that the internal configuration is exactly the same.
For example one might use different:
Motor
fan
filter
Control method
even:
airflow structure
Therefore, EFUs of the same size may have different air volume and air pressure parameters.
This is why EFU selection cannot just look at:
Length × width × height.
10. Will the filter affect the EFU air volume?
meeting.
This is a very important factor in EFU design.
Air creates resistance as it passes through the filter.
As the filter age increases, the accumulation of particulate matter in the filter may cause resistance changes.
therefore:
Filter status → System resistance → Fan operating point → Actual air volume
There is a relationship between.
This is why you need to pay attention to the filter status during long-term operation of EFU.
11. What is the relationship between wind pressure and air volume?
It can be simply understood as:
Air volume represents air supply capacity.
Wind pressure represents the ability to overcome system resistance.
EFU needs to consider both parameters simultaneously.
For example:
target air volume + filter resistance + system resistance ↓ required fan operating point ↓ matching motor
If you only tell the manufacturer:
'I want 1000m³/h air volume.'
This information may not be enough.
Also need to know:
Under what static pressure or system resistance conditions can this air volume be achieved?
12. Why can’t EFU air volume just look at the fan parameters?
Because the performance of the fan itself is not exactly the same as the actual working state after being installed in the EFU.
There are also:
filter
wind channel
Box structure
Air inlet and outlet
These all affect system resistance.
therefore:
The theoretical air volume of the fan is not equal to the actual operating air volume of the EFU.
The actual design needs to be matched with the complete system.
13. What should the EFU wind speed of semiconductor equipment be?
Semiconductor equipment cannot simply apply a uniform wind speed.
Specific parameters need to be based on:
process area
Equipment structure
Air supply area
Cleanliness requirements
airflow uniformity
Process requirements
Sure.
Particular attention needs to be paid to:
Is the wind speed uniform?
Because for precision equipment, simply reaching a certain average wind speed does not necessarily mean that the air flow state in the entire area meets the requirements.
14. What should the EFU wind speed of lithium battery equipment be?
The EFU of lithium battery equipment also needs to be determined based on the specific equipment.
Different devices:
Different structures
Different craftsmanship
Different air supply areas
So the target wind speed may also be different.
For this type of project, it is usually necessary to first determine:
Target wind speed + air supply area + air volume
Then match the EFU fan and motor.
15. How to determine the EFU air volume of photovoltaic equipment?
EFU selection of photovoltaic equipment can be obtained from:
device space
Cleanliness requirements
Air supply area
target wind speed
Make judgments on other aspects.
If the equipment already has clear air volume requirements, the equipment technical parameters can be directly used as design input.
If the air volume is not specified, it can be based on:
Air supply area × target wind speed
Make a preliminary estimate and make adjustments based on filter resistance and fan performance.
16. What should we pay attention to in the EFU of panel display equipment?
Panel display equipment usually requires comprehensive considerations:
cleanliness
Air volume
wind speed
airflow uniformity
Installation space
and other factors.
Especially in equipment with limited space, the EFU may need to adopt a compact or ultra-thin structure.
17. Will the air volume of the ultra-thin EFU be affected?
One of the biggest challenges of ultra-thin design is:
How to maintain reasonable aerodynamic performance within a limited altitude.
Because after the product height drops:
Reduced fan space
Motor layout is limited
Filter space is limited
Internal airflow passages become shorter or narrower
Therefore, ultra-thin EFU cannot be achieved simply by reducing the height of the cabinet.
The height of some EFU products of Aili Industrial can reach about 70mm . When designing such products, you need to consider the following at the same time:
Motors, fans, filters, airflow paths and overall structure.
Actual air volume needs to be determined based on specific product specifications.
18. How does Aili Industrial match the EFU air volume and wind speed?
Aili industrial production system covers:
Motor
fan
filter
Automatic control system software and hardware
sheet metal
Whole machine assembly
Therefore, during EFU design, matching can be made between multiple core components.
For example, the customer stated:
'The internal height of the equipment is limited and requires a certain wind speed and volume.'
Then you need to consider at the same time:
Installation height
↓
filter
↓
fan
↓
Motor
↓
wind pressure
↓
Target air volume
↓
target wind speed
↓
Control method
Rather than simply selecting a model with the closest size from an existing product.
19. How does Aili Industry determine parameters according to customer needs?
If the customer is not sure about the specific air volume, he or she can provide basic information about the equipment first.
For example:
Device name
Equipment purpose
Installation space
Air supply area
target wind speed
Filtering requirements
Power conditions
Control method
If the client already has:
Air volume requirements
or:
Wind speed requirements
It can also be provided directly.
If equipment drawings or installation location photos can be provided, it will be more helpful to further determine the EFU structure and parameters.
20. How should EFU air volume and wind speed be understood?
It can be summarized simply:
Air volume
solve:
How much air is needed?
wind speed
solve:
How fast is the air being moved?
wind pressure
solve:
How powerful does a fan need to be to overcome resistance?
filter
Influence:
How much resistance does air create as it passes through the system?
Motors and fans
Responsible:
Provides aerodynamic force.
so:
EFU air volume, wind speed, wind pressure, filter, motor and fan are actually a complete system.
21. What is recommended to be provided to the manufacturer when choosing EFU?
If you plan to purchase or customize EFU, it is recommended to provide at least:
1. Installation dimensions
Length, width, height.
2. Target air volume
If it has been determined.
3. Target wind speed
If it has been determined.
4. Filtering requirements
HEPA, ULPA, etc.
5. Power supply
voltage, frequency.
6. Control method
Independent control, equipment linkage or communication control.
7. Inlet and outlet wind directions
Conveniently determine product structure.
8. Equipment drawings
If available, it is best to provide installation location diagrams as well.
22. Aili Industrial EFU
Aili Industrial produces EFU, FFU and other purification equipment, and has established a network covering:
Motors, fans, automatic control system software and hardware, sheet metal, filters and complete machine assembly
production system.
EFU products are available depending on the device’s:
Air volume, wind speed, filtration requirements, installation space and control method
Make a match.
For applications where the internal space of the device is limited, ultra-thin structures can be further considered, such as an EFU solution with a height of about 70mm.
Aili Industry is more concerned about:
Match motors, fans, filters, structures and control systems around the actual needs of the equipment.
The specific air volume and wind speed need to be determined based on actual equipment parameters, rather than using a fixed parameter that is suitable for all equipment.
23. Frequently Asked Questions
What is the general air volume of EFU?
EFU does not have a unified air volume that applies to all equipment and needs to be determined based on the equipment structure, air supply area, target air speed, filter and system resistance.
What is the typical EFU wind speed?
The specific wind speed needs to be determined based on the equipment process and air flow requirements, and cannot simply adopt a fixed value.
Can the EFU air volume be adjusted?
The speed adjustment function can be configured according to the motor and control system, and the actual air volume can be changed by adjusting the fan operating status.
Is the bigger the EFU air volume, the better?
no. The appropriate air volume needs to be determined based on the actual air supply needs of the equipment.
Is the higher the EFU wind speed, the better?
no. The wind speed needs to match the equipment process, air supply area and air flow requirements.
Will HEPA filters affect EFU air volume?
meeting. There is resistance in the filter, which will affect the fan operating point and actual air volume.
Can ultra-thin EFU still maintain a large air volume?
It needs to be determined according to the specific product structure. The ultra-slim design requires consideration of motors, fans, filters and airflow channels.
Can Aili Industrial customize the EFU based on air volume and wind speed?
Product matching can be carried out according to the installation space, air volume, wind speed, filtration requirements and control methods provided by the customer.
