Cross-posted to uk.d-i-y for better information.
I gather the weak point is in cool damp weather. The outside "cold" end
condenses water out of the air - this is the same thing that makes air
conditioners need a drain. When it's cool enough and damp enough it
isn't water condensing out but ice - and that doesn't trickle away.
Luckily cool damp weather is a rarity in the UK :)
I have been running an air to air heat pump for heating for a few days
It likes cool damp weather as it can take the latent heat out of the
water and pump it in.
It only drops the air temp by a degree or two when it working like that.
You get puddles of water around the unit but no ice so far.
On Thu, 20 Mar 2014 21:26:21 +0000, Vir Campestris wrote:
don;t they have a heater like "normal" A/C and frost free fridges? to
melt any ice so formed...
Course using elec to heat it to melt ice rather messes with alleged
efficiencies of the whole thing in the first place...
When I had a/c installed in one of my factories, it was a lot more
expensive to buy one that was designed for the British climate than it
was to buy one that was designed for use in Japan.
On Thu, 20 Mar 2014 22:36:12 +0000, dennis@home wrote:
Well it gets the latent heat from the phase change vapour to liquid
which is OK. You don't want to take the latent heat of the next phase
change, liquid to solid, if you can help it. Ice is a good thermal
insulator and you'll have to use energy to melt it to regain a decent
(short term) COP.
It's not trying... I've seen aircon units frozen solid with air temps
in the mid 20's and only reasonable humidity.
I assume you mean the internal units, we haven't had enough warm weather
to see if the internal unit ices up, but if it does then you can just
keep blowing the warm air you are cooling over it until it melts. No
effect on bills unless its still frozen when switch it off.
That's what mine does. If the weather is just right, it sends a
giant plume of fog across the back garden when it's finished the
I tend not to run it for heating when the outside temperature is
just a little above freezing, as I doubt it's any more efficient
than an electric heater when it's having to keep switching over
to defrost cycles. It works fine when outside is below freezing,
as there's no water to condense out and freeze.
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