Energy cannot be created or destroyed...

[1198]

If energy can not be created or destroyed how can the Dyson air cooling fans work? There’s no cooling medium eg a chilled water system) or way of discharging ‘waste’ energy / heat (eg a pipe to poke through a window belching hot air) to my knowledge. Is my schoolboy understanding of physics all wrong? Are they ‘just’ a glorified ultra expensive fan with a smart way of moving the air?

[Riejufixing]

[P.]

Given the fact you can essentially buy a portable air conditioner for that price, it can fuck right off

[1198]

[WD Forte]

At first I thought mebbe a solid state Peltier effect thingummybob?
but that transfers heat similar to any fridge/aircon
so looked it up and........

It's just a fancy fan


Dyson customer supprt says

"Hello there, our Air Multiplier products cool you rather than the room. They are not air conditioning units as they do not have a cooling element nor do they reduce air temperature.

The cooling effect from the fan occurs as speed of the air flow from the machine comes into contact with your skin. This is the same as any conventional fan. Where ours differs is by providing a smooth and constant airflow, whereas bladed fans will buffet producing interrupted airflow"

Not cheap at all, sod that
My £15 fan can 'buffet' me all it likes
____________________
bikers smell of wee

[WD Forte]

[Easy-X]

The only thing I would say about the Dyson fans is they don't have blades so perfectly safe when you have little kids larking about.
____________________
Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[Riejufixing]

Here's an expensive fan with timer and remote:

https://www.screwfix.com/p/blyss-fs40-11nr-16-stand-fan-220-240v/7868k

Here's a cheaper one:

https://www.screwfix.com/p/ft-30eii-12-desk-fan-220-240v/6545k

[stinkwheel]

Oooh. Physics AND biochemistry.

The cooling medium is the sweat on the surface of your skin. It is generated by passive osmosis of fluid following a concentration gradient created by a sodium ion pump driven by ATP proton donating molecules. This in turn derives energy from the breakdown of pyruvate molecules from the sugars in your food.

The cooling effect happens because of the enthalpy absorbing behaviour of the state change from a liquid to a gas as the fluid evaporates into a higher mollecular energy state. This effect is known as the latent heat of vapourisation. For water this is 2,260 kJ/kg (vapourising a litre of water will absorb that much energy). The dyson fan speeds up this effect by increasing the flow of lower humidity air passing over the skin:air interface.

The fan itself will not cool the room, it will actually heat it up by burning electricity. The room will feel cooler because your skin is a hugely effective air conditioning unit moving heat energy from your skin to the surrounding air (furtherheating the room).
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[1198]

[stinkwheel]

[stevo as b4]

I like my fans to be 18'' diameter and sound like a light aircraft taking off on an uphill grass runway, otherwise its not worth having.

[Riejufixing]

[Riejufixing]

[P.]

[stevo as b4]

.

[stevo as b4]

[stinkwheel]

Of course, we do it all wrong. We fling all the windows open and sit there cooking and complaining.

In a well insulated house during a heatwave you should keep the windows shut and the curtains drawn during the day then open them at night to let the hot air out.

Look at houses in the med, they shut them up tight and close the shutters during the day.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Riejufixing]

[hedgehugger]

I seem to remember reading that hanging a damp towel in front of the air helps with cooling air. Was always recommended as a way to keep the ferrets cool, so should work for peeps as well

Haven't needed to this year yet, but If it gets too hot try taking a cold, wet flannel to bed with you. I've fallen asleep with one on my face several times, lol.

[MCN]

[MCN]

[goto10]

Get a fan with a water mister - they _really_ feel cool - I bought a little handheld rechargeable one, nicely effective:
https://www.amazon.co.uk/gp/product/B01FQJ579S
____________________
'12 NC700S & '12 CB600F Hornet [Stolen by some dickless twat] Suzuki GT500 shed

[Polarbear]

[Triton Thrasher]