Posted by alexibu on February 21, 2007, 9:15 am
On Feb 21, 11:49 am, markz...@digiverse.net wrote:
I think you are misunderstanding what a heat pump is - see
The heat pump is not the actual compressor. It is the thermodynamic
Therefore directly driving the compressor with wind turbine would not
have the benefits you are describing. They might have a small benefit,
but most likely it is beneficial to allow the wind turbine to run at
different speeds to the compressor.
Posted by Joe Fischer on February 21, 2007, 11:02 am
I think he knows what a heat pump is, he probably
owns 2 or 3. Your link says a heat pump is any machine
that cools or heats using a working fluid and radiators.
Can you explain why not? Any air conditioner
can be used as a heat pump if it is put in the window
The big thing about a heat pump is that both
radiators need to be able to tolerate high pressure
depending on cool or heat mode, plus an additional
orifice with a valve to change modes.
Some windmills do run at a different speed than
the output shaft.
There is a problem with a heat pump though,
usually they are undersized in heating mode, normally
the temperature difference wanted in heat mode is
more than in cool mode.
A simple solution to this problem is to have
more than one heat pump for the same space,
then both can be run in heat mode if needed,
and chance are only one will be needed in
Installers and manufacturers know that a heat
pump does not work well or at all below freezing, so
backup heat strips are used when outdoors
temperatures are low (for air to air heat pumps.
Even so, a heat pump still needs an alternate
heating system for real cold weather, a huge heat pump
is needed for heating loads of 20 or 30 kilowatts, and
that would be the equivalent of a very small gas furnace.
Posted by markzoom on February 21, 2007, 2:29 pm
Exactly. In my case I'm more interested in the heating configuration,
though I could run the cold end of the cool pipe through my
refrigerator as a bonus.
Point taken. I envisage the mast (scaffolding tube?) to play a part in
Personally I don't need the cooling, so it will be designed for
Not a problem here in the Azores but would be elsewhere.
My house only needs a measly 4kw to be comfortable in the winter,
there is not much temperature variance on Islands, the air is pretty
much the same as the sea temperature +/- land heating/radiance day/
Posted by Joe Fischer on February 21, 2007, 4:27 pm
On 21 Feb 2007 06:29:44 -0800, firstname.lastname@example.org wrote:
The biggest problem is buying, begging, or borrowing
a good enough oil induction vacuum pump to vaporize all
moisture in the system and suck it all out to get it dry before
putting the freon in.
Otherwise, the orifice will freeze up constantly.
Posted by gfretwell on February 21, 2007, 5:13 pm
On Wed, 21 Feb 2007 11:27:25 -0500, Joe Fischer
If you don't mind "venting" a little into the air all you really need
to do is purge the system and use a new dryer. Turn the can over and
shoot liquid in the high side until it comes out the other end. HVAC
techs used to do that all the time before the rules about discharging
If you use R134 it is not prohibitively expensive.
That is not as good as using the proper vacuum pump but millions of
systems were charged that way and worked.
A new dryer will take out all of the moisture normally in a system but
that still doesn't do anything for the inert air.