All across the region that NREL classifies as Humid-Semitropical, the
number of weeks varies with each location, but the number of weeks where
outdoor humidity is LOWER than indoor humidity is small, maybe 3 maybe 6
We live in these areas and we know when it is OK to open the doors and
windows to let large quantities of outside air in.
Ventilation dampers work well in some climates, less well in others.
Heat pumps work well in some climates, less so in others. geothermal
heat pumps work well in areas that have winters, not so good here in
Houston TX After talking to a well driller who has assisted with
installation of geothermal heat pumps and has made repairs to wells
drilled for geothermal heat pumps, he has come to the conclusion that
here, we need a river, large lake, or a simple leaky evaporation pond to
displose of the hot water out of the geothermal heat pump.
One size does not fit all, not even close. So Nick solution will work
OUTSIDE the Deep South and the Desert Southwest.
Would you have any evidence for this your present vague article of faith?
The average humidity ratio is less than 0.0092 pounds of water per pound
of dry air from October through April in Macon. How many weeks is that
in your little ol' Texas town? :-)
Nick is sitting at a balmy 72F while I am at 93F, Macon is 90F, Mobile
is 88F, Atlanta is 89F
Nick and Mobile are tied for highest humidity at about 55% currently,
the rest of us are in the 30% to 45% range.
Nick is like many in a university setting, they are isolated from the
rest of the world and have little idea what problems are being faced
elsewhere. And like many in an ivory tower setting, it is difficult for
them to believe that anyone knows more than they do. Nick has shown
this to us with nearly EVERY comment he makes. No one is infallible,
everyone makes some mistakes from time to time, yet Nick appears to want
to SMASH your face in with nearly every comment.
The message to Nick is that the world is NOT a copy of what he sees in
Pennsylvania, things that will work well in Villanova may not work even
in upstate NY (i.e Buffalo)
And for Nick's benefit, ALL the cities mentioned here have very high
humidities at night in particular. Residents will avoid bringing in
night time air if at all possible as that time is when the RH climbs
towards saturation (80-100%)
My parent's house in North Carolina was far enough into the hills that
after 10PM, the air temp and humidity dropped off enough that a whole
house fan could dump alot of excess heat outside
This says that absolute humidity is NOT a good moisture variable even
though the amount of moisture is constant as a given volume of air
rises This is a useful tool only to calculate how much water is in the
air at any given time and as that water rises towards the stratosphere,
how likely are clouds to form and rain to fall.
This page is written by a Meteorologist. He gives a good explanation of
the problem and points out that RH without Dew Point temp is half a loaf.
For instance, right now in Houston
RH is 87%
Dew Point is 69F
Right now in Villanova
Dew Point is 56F
I do not imagine that you want to introduce this moisture laden air into
your apartment/home if you can help it. Doesn't matter whether we talk
Deep South or Pennsylvania. And in no case, do you want 90+F air in any
significant quantity coming inside to increase your A/C bill.
The Meteorologist points out that the highest dew point ever recorded in
his location was 88F right after a thunderstorm. Other than that, on
very humid days, the dew point only gets to the low 80s there
(Cincinatti) although Gulf War vets do know 90/90 days as the Red Sea
heats to above 90 F and with air temps in Kuwait rising to 110 or higher
lots of water is in the air. 90% RH with air temps above 90F is a very
very real situation for that location.
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