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Re: Heat engine - Page 6

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Posted by Noon-Air on March 7, 2005, 3:46 am
Say there Scooter, you never did answer my questions.......

How do *you* correctly size a heating and cooling system for a home?? What
design parameters do you use for you to correctly size a system?? Do you do
a complete room-by-room heat load/loss analysis before you size and install
a heating and cooling system?? What type of systems do you normally
install?? zoned?? multi stage?? gas?? oil?? electric?? heat pumps??

BTW...I did read you last statement and didn't see where you had answered
any of my questions....in fact, your last statement only generated more
questions, but I will refrain from asking those until you have answered the
original questions.

Posted by Gymn Bob on March 7, 2005, 3:51 am
You obviously didn't read my answer anyway.

Not bad trolling. Almost had me for more than 5 answers.


Posted by Abby Normal on March 7, 2005, 1:28 pm

I read your post and I have installed ground source heat pumps in
Northern Canada that are sized close to the heating load. As an air
conditioner they are easily twice the required capacity as you make
reference to.

High humidity and mold is a winter problem in Canada, where as it is a
cooling problem on the gulf coast.

These over sized heat pumps in Canada face a short cooling season and
the humidity in the outside air is around 50% lower in terms of
moisture held per unit dry air compared to of what systems along the
gulf coast, in Florida or down on the Islands face.

In addition the Canadians homes are more sealed, and when doors/windows
are closed because the AC is running, the infiltration rates are much
lower than in the US. Therfore not only is the outside air much less
humid in Canada, the infiltration rate is also much lower, therefore
the latent load that a Canadian system has to deal with is much lower
than the gulf coast.

I never observed a high humidity problem with oversized residential air
conditioning in Canada, and again I am not talking about areas like
Windsor either.

The outdoor ambients in Canada are also lower, and an outdoor design
temperature would typically be maybe 10F or 5.6C warmer than the inside
design temperature. On the gulf coast, the outdoor design temps are
going to be 20F or 11.1C warmer than the inside design temperature. The
peak humidity will occur on a day that is only at  half of the design
temperature difference. The have cooled down to hot Canadian ambients
and have sky high latent loads with higher infiltration rates.

I have many customers here, down in the Islands, who on their old
systems would be setting thermostats down to 72F in cooling, just to
try and feel comfortable. Their new systems properly dehumidify, and
they are now comfortable at 78F. You don't buy the humidity comfort
angle in the cooling season as you have never had to really deal with

So there are differences between Canada and the gulf coast that you are
not grasping.

I have gone from the Great White North to being hundreds of miles south
of Mr. Noon Air. I actually met Mr. Noon in person and can tell you he
is a professional and does what works in his area.

Posted by Gymn Bob on March 7, 2005, 6:37 pm
 Thanx for that info and input.

I didn't realize the effect was so dramatic due to climate changes. The
humidity is the largest problem here also. The humidity has to come out
before the temperature feels OK.

Western Canada (and probably northern) doesn't have the humidity problems we
face in southern Canada either. We have many summer days at 35-37C, 100% RH
and it doesn't get higher than that before the sky cries...LOL

I believe Mr N.A. is a professional.  He apears to know real information. He
is just a little rough around the edges for many...LOL This seems to be
typical of many of these guys here.

Posted by Abby Normal on March 7, 2005, 10:48 pm
Gymn Bob wrote:

problems we

100% RH

information. He

Sounds like you are in the interior of BC or SW Sask.

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