I was looking at those - they're much quieter than the monobloc portable units. AIUI the compressor is inside, it's only the condenser that's out the window, and there's a wall bracket for it.
The problem is the hose is about 1m and doesn't detach (it's full of refrigerant) - you need to be able to pass a desktop PC style box out the window. So not for small windows.
Out of stock everywhere, however.
Theo
With standard 8ft ceilings, this projects 1ft below the ceiling which gives headroom of 7ft. That's enough clearance for head height, but isn't enough if you raise your arms above your head. So you need to remember not to do that.
Theo
+1
This one. I think it's already been mentioned above? Appears to be no longer available here (he bought his less that 2 weeks ago!):
The make is Arlec. Model is PA0502GB. I believe that the model is now discontinued (we were given it over six years ago), but the direct successor is the PA0802GB.
Ta Muchly
Avpx
DC motors can have continuously variable speed control, while cheap AC motors typically have just a handful of speeds (often 3 speeds based on two coils: energise coil A, coil B, or coils A+B). Also AC motors tend to vibrate at
50Hz or harmonics of that, while DC doesn't do that.DC motors require electronics to convert from mains to DC, which adds cost. AC motors typically just have a switch to select one of the three speeds.
I've never seen a DC hairdryer - do you mean battery models? The heating part doesn't care about the power source. Battery models are likely weaker for heating and/or slower compared with mains.
Theo
DC hairdriers not uncommon in my experience. Typical one that I've taken apart used the element as a dropper with a low-voltage permanent magnet DC motor tapped off near one end through a diode (so motor running on half-wave DC). Slightly cleverer, it's then possible to put a diode in series with the element (same way round as the motor one) to get two heating powers with the motor getting the same half-wave DC and so running at the same speed. 110/230V switching can be done with split element connected in series or parallel, with the motor tapping on one only.
nib
Thank you :-)
Thank you :-)
You're welcome.
On mine the outside unit is just a fan and heat exchanger. The compressor is in the inside unit.
It should be possible with modern electronically-controlled motors to make an exceedingly light ceiling fan which is largely harmless if intercepted.
How about a quad-copter drone stuck to the ceiling upside-down? And when you didn't need a down-draught you could use it for its intended purpose.
Adapt a drone so that it flies out of the way or creeps into a corner.
GH
Maybe they could licence the tech from SawStop that detects if you put your finger in the way of the blade and stops the saw dead, leaving you with just a scratch. Unlike SawStop, you might wish to be able to use the fan afterwards - but perhaps putting it into reverse for some milliseconds is enough to stop it.
Theo
Dunno, hard to do blades that can move much air but which just bounce off your head or hands if they get in the road because the blades need to be rigid to more air properly and have to be much bigger than a small table fan
Still capable of taking your eye out though.
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