Re: heat pumps

In article <16d7efbb-85d0-44e0-9a27-7f420ca89771
@s8g2000prg.googlegroups.com>, sci.electronics.design, dlzc1
@cox.net says...
Dear Jim Thompson:

On Dec 31, 10:17 am, Jim Thompson <To-Email-Use-The-Envelope-I...@My-
Web-Site.com> wrote:
On Mon, 31 Dec 2007 08:59:23 -0800 (PST),dlzc<dl...@xxxxxxx> wrote:
...
It cannot deliver 100% to the room (house)
because something will be lost to the (snowy, I am in
New England) outside.  How could a heat pump be
more efficient heater then?

Because it produces *colder air* outside, moving that
heat inside.

Except that outdoor AIR heat exchangers

... sometimes ...

freeze up, forcing a serious operating limitation... as I
pointed out previously, my "heat pump" has a sump
heater to prevent this :-(

It happens when cooling rooms too. We have a room air conditioner
that "supercools" a room where our computer equipment resides. It is
not unusual for the indoor-side (cold-side) heat exchanger to ice up,
and stop allowing air to pass. So the compressor just keeps driving
the coil colder still...

Out 2T through-the-wall unit would do that too, then blow the
breaker. I think it was low on freon though. It was too expensive
to have it fixed and it worked fine if the fan was left on.

Refrigerators have the same problem, but they automatically do a
"defrost cycle" to eliminate the ice buildup.

No big surprise, no great loss in efficiency, just another lesson by
Nature for us to learn just Who is boss. ;>)

Yep.

--
Keith
.

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