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Fan-less cooling solution for laptops up to 40W launched (www.tomshardware.com)
submitted 2 years ago by to c/technology@lemmy.world
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Device uses movement of ions to generate airflow without any moving parts like in iPads and MacBook Air.

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[–] 70 points 2 years ago (22 children)

Bladeless Dyson's have the fans hidden, as far as I know. But they still have a bladed fan in there.

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  • [+] -15 points 2 years ago (21 children)

    Yes but they generate more airflow than the fan alone can

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  • [–] 26 points 2 years ago (13 children)

    They do not. For a given power input they produce less airflow at lower velocity than a regular fan. They’re a complete scam.

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  • [–] -1 points 2 years ago (12 children)

    Citation needed

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  • [–] 4 points 2 years ago (11 children)

    You made a claim first, so you should provide your citation first as well.

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  • [–] -3 points 2 years ago (10 children)

    https://electronics.howstuffworks.com/gadgets/home/dyson-bladeless-fan.htm

    Air surrounding the edges of the fan will also begin to flow in the direction of the breeze. This process is called entrainment. Through inducement and entrainment, Dyson claims its fans increase the output of airflow by 15 times the amount it takes in through the pedestal's motor.

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  • [–] 3 points 2 years ago (7 children)

    Advertising for a product isn’t a citation. That article literally just repeats Dyson’s own claims. Do you have anything that actually tests that claim?

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  • [–] 2 points 2 years ago (4 children)

    I don't think you two are even contradicting each other. The airflow going through the base can be 15x smaller than the total result, but also require more energy than just using a regular fan that moves that amount of air.

    Total airflow and efficiency are two independent things.

    Disclaimer: I have no real data on how Dyson fans work.

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  • [–] 0 points 2 years ago (3 children)

    Of course, it is a purifier, it is hard to get high volumes of air through the HEPA filter

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  • [–] 2 points 2 years ago (2 children)

    As demonstraded by the ActionLab video someone else posted, "bladeless" fans in general are less efficient. The one he tested was not a Dyson and didn't have a HEPA filter.

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  • [–] 1 point 2 years ago (1 child)

    They're "bladeless" fans are just regular fans with more steps. Those added steps introduce inefficiencies. Simple as that. If you wanted to make a fan more efficient, you could add a shroud close to the blades, but the energy cost of electric fans are already low enough that it really doesn't matter.

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  • [–] 26 points 2 years ago* (last edited 2 years ago) (3 children)

    I recently watched some YouTube video that debunked that claim. They are basically pointless.

    Edit: https://www.youtube.com/watch?v=ySSo5PmZZJM

    It actually works better when You take the inner fan out of the casing. So they are actually a scam.

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  • [+] -19 points 2 years ago (2 children)

    Not a dyson

    Not a proper test, air volume not measured - only speed. The point is to not have fast air so this only confirms the concept works

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  • [–] 9 points 2 years ago

    They literally generate as much as that small fan in the case can generate.

    With the aerodynamics of the case it's just a matter of converting higher pressure into lower pressure with higher (& a bit more laminated) airflow.

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