Are Bladeless Fans Powerful? (are they really effective)
Bladeless fans have a lot going for them, they look like pieces of art, run quietly, are safe to use around pets and children and are energy efficient.
But Are Bladeless Fans Powerful?
Actually, bladeless fans are far more powerful than you would think considering their design. For many years fans have blades that turn to direct airflow. The larger the fan blades, the more powerful the flow of air.
However, on the face of it, bladeless fans have no fans to direct airflow so how can they be powerful?
It turns out, calling them “bladeless” is a bit of a misnomer because bladeless fans do have fan blades. It’s just that they’re concealed within the base of the fan.
How Do Bladeless Fans Work?
Firstly, they’re called bladeless because the fan blades are not visible, not because they’re not there.
The air is drawn in through the pedestal of the fan by the brushless motor at a rate of around 27 litres per second. The design of the asymmetric or mismatched fan is similar to that of a turbocharger so it produces a powerful airflow stream.
The air is directed upwards to the top ring which releases the air so that it flows through the front of the ring.
This is when the air gains extra power because of something which is known in the scientific world as “entrainment”.
Simply put, entrainment is caused when the air being forced from the top ring of the fan drags air from outside the ring through with it.
This is caused by the already moving air creating negative air pressure which then pulls the surrounding air in with it.
The Coanda Effect
The shape of the ring is designed to resemble an aeroplane wing which makes it thinner towards the front of the ring.
This creates what is known as the coanda effect which is where the air leaving the slit along the ring flows along the curve and not in a straight line.
This coanda effect causes low pressure inside the circle created by the ring. This low pressure pulls air from outside (at the back of the ring) through with the air that’s forced from the ring’s slit. Which is called inducement in scientific circles.
2nd Entrainment Of The Air
As the air exits the ring it entrains more air from outside the ring which adds to the airflow.
The result is upwards of 15 times more air leaving the ring of the fan than originally entered at the base.
Below is a short video that explains it far better than we can.
Because the air is drawn into the fan at the base and directed up towards the ring at the top using a small internal asymmetric fan, the air flows at a constant rate.
Unlike bladed fans which literally chop the air as they spin which gives an interrupted air flow.
This smooth airflow when combined with entrainment and the coanda effect all contribute to the increased powerful airflow produced by a bladeless fan.
How About Energy Efficiency?
Bladeless fans work by utilising certain scientific principles to create a powerful airflow. Because of this, they only need to be powered by a small motor.
The motor uses less energy than bladed fans of a comparable size. Regular bladed fans have large blades which need a powerful motor to rotate. This takes increased energy, in fact, in a recent test run we found that when comparing similar bladed and bladeless fans, the bladed fan would cost just over 27 pence to run for 8 hours.
Whereas a similar bladeless fan would cost just over 15 pence to run for 8 hours.
Which means that bladeless fans not only look good and create a powerful airflow, they’re also energy efficient as well.
Do Bladeless Fans Cool A Room?
We’re often asked this question here at Check Appliance and our answer is the same for all fans.
No fan cools a room, all they will do is accelerate the evaporation of sweat on your skin and therefore cool you.
To cool a room you’ll need an air conditioner (A/C).
The Powerful Cooling Effect Of Bladeless Fans
Let’s face it, you only turn a fan on when you’re hot. And usually when you’re hot enough to reach for the fan, you’re already beginning to sweat.
Due to the powerful, uninterrupted stream of air flowing from your bladeless fan (which is at least 15 times greater than the approximately 27 litres per second that’s drawn into the base), it will cool a greater area of skin.
This is due to evaporation as we said earlier and as such, would happen using a regular fan, eventually. But the extra turbo boosted airflow from a bladeless fan will cool more skin faster.
Do You Have Any Questions?
We hope that’s cleared up any doubts you might have had concerning the power of a bladeless fan. As there are no visible moving parts and because the design is so far away from a regular fan, it can be confusing.
If you do still have any questions, drop us a line in the comments section.
OR SEE THIS: How Does A Bladeless Fan Work? (do they have blades)
Frequently Asked Questions
Bladeless fans are more energy efficient than regular fans and produce a more powerful uninterrupted airstream. They draw in around 27 litres of air per second but due to the scientific principles of the coanda effect and entrainment up to 15 times that amount gets pushed from the central ring of the fan.
Bladeless fans will cool you better than their bladed counterparts. But remember no fan cools a room, you’ll need an air conditioner (A/C) for that.
Bladeless fans move up to 15 times more air than is drawn into the fan at the base. Which is why they are also known as air multipliers.
Dyson didn’t invent bladeless fans, he just improved on the original design which was invented by the Japanese company Toshiba in 1981.
According to Dyson, their pure cool air purifier has a CFM of 868 Cubic Feet per Minute.