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Posted by Geoman on April 10, 2007, 5:49 pm
>I was a professor of Mechanical Engineering many years ago. I have been
> disabled for a long time. I am in the process of building a home, and
> have
> come across a problem. I must have the temperature inside of the house,
> 24/7/365 at 67 degrees. I now live in TN and it gets very hot here, 95 is
> not uncommon.
> I was told by several HVAC companies that the new heat pumps with an air
> handler will work for my case. But from my old days of doing things by
> hand
> and slid rule, a heat pump cannot do this, they say it can.
>
> Can some one please advise me on this problem. If you do answer me,
> please
> consider this, it concerns my life.
>
> thanks
> Prof. Jake Trexel
Professor,
First, I suggest you get an engineer certified in refrigeration or your
never going to be satisfied with any answer without mathematical and
scientific proof.
Secondly, keep a CLOSE tolerance on your building construction, use
materials that do not allow infiltration, such as sprayed on foam verses
crappy fiberglass, or consider foam panel construction. Control the
infiltration with make up air, keeping a positive pressure on the home to
prevent unwanted pollutants and humidity infiltration. You won't obtain what
you desire using general construction methods and materials.
Third, I don't know what medical condition you have that require such
extreme control, but you should ask your certified licensed engineer if
commercial equipment isn't the best choice for you. Another choice is a two
stage geothermal system, which will control costs and eliminate the low
ambient operational problems. You may have to order Hot Gas Bypass on your
geothermal to control heat reclaim during extreme humidity days. Yes, its
available and used, just not that much for residential units. Being your a
past professor I imagine your going to have a much bigger and better house
than us stupid people on this newsgroup could afford! (TNC) So get ready
to really dig deep to meet the construction requirements, NO HVAC system
will work right if you use fiberglass crap and standard construction
practices!
Personally, I wouldn't give you a quote without engineering prints
specifically spelling out every detail, including duct size, placement of
ducts, refrigerant sizing with exact placement of lines, pressure settings
if HG is used, CFM to be done by certified balancing company, and a punch
list to make sure everything is right before letting you enter the home.
BTW, I have done lab work with tolerances of + - 1 degree with humidity in
the same bands. Never have I heard a hospital require such limits, and
certainly never have I heard of an illness with such tolerances for a home.
This is why I recommend you hire a licensed engineer in the HVAC field and
get specific prints.
Rich
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