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HVAC Discussions - Heating, ventilation and air conditioning.
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Posted by Graven Water on June 26, 2008, 3:55 pm
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> What if it's too cold to run the AC,
> yet warm enough so the heater isn't drying the air much? Say it's
> 60F, and the humidity without any AC is 70%. I would want to heat at
> that temperature, not cooling! If you run the AC, won't it have
> to be cooling things down to 55F?
Is the answer to this riddle, perhaps that the water-holding capacity of
air increases very quickly with temperature? It does, I looked at a graph.
So there might be a rather narrow window of temperatures where it's too
cold to use the AC and too warm for the heater to dehumidify well.
There would be such a window, unless you're willing to shiver with the AC
or overheat the house for the sake of dehumidifying. But maybe it's a narrow
range of temperatures.
Laura
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Posted by Noon-Air on June 26, 2008, 4:34 pm
show/hide quoted text
>> What if it's too cold to run the AC,
>> yet warm enough so the heater isn't drying the air much? Say it's
>> 60F, and the humidity without any AC is 70%. I would want to heat at
>> that temperature, not cooling! If you run the AC, won't it have
>> to be cooling things down to 55F?
What do you think happens when a heat pump go into defrost when its heating
during the winter?? the short answer is that when it goes into defrost, its
actually shifting into cooling mode and half of the heat strips come on to
keep the thing from blowing snowballs inside while its defrosting outside.
Dehumidification while in heat mode with the proper controls does the same
thing. it shifts to first stage cooling mode and brings on half the strips
to dehumidify. but don't worry about it because if its set up right, you'll
never know that its even happening. it just makes your home comfortable.
show/hide quoted text
> Is the answer to this riddle, perhaps that the water-holding capacity of
> air increases very quickly with temperature? It does, I looked at a
> graph.
> So there might be a rather narrow window of temperatures where it's too
> cold to use the AC and too warm for the heater to dehumidify well.
There is no riddle to it. Reading a graph isn't going to answer your
question either.
show/hide quoted text
> There would be such a window, unless you're willing to shiver with the AC
> or overheat the house for the sake of dehumidifying. But maybe it's a
> narrow
> range of temperatures.
> Laura
No resi system will cool down below 68 degrees without adding a freeze stat
and defrost strips..... at least not without freezing the coil inside.
I am still trying to understand a couple of things here.... First is where
your located...I must have missed that part, and second, why do you wanna
turn the place into a walk in reefer, when thats not the purpose of a
comfort system??
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Posted by =?ISO-8859-15?Q?Tekkie=AE?= on June 26, 2008, 9:55 pm
Graven Water posted for all of us...
show/hide quoted text
> > What if it's too cold to run the AC,
> > yet warm enough so the heater isn't drying the air much? Say it's
> > 60F, and the humidity without any AC is 70%. I would want to heat at
> > that temperature, not cooling! If you run the AC, won't it have
> > to be cooling things down to 55F?
>
> Is the answer to this riddle, perhaps that the water-holding capacity of
> air increases very quickly with temperature? It does, I looked at a graph.
> So there might be a rather narrow window of temperatures where it's too
> cold to use the AC and too warm for the heater to dehumidify well.
>
> There would be such a window, unless you're willing to shiver with the AC
> or overheat the house for the sake of dehumidifying. But maybe it's a narrow
> range of temperatures.
>
> Laura
>
>
A good comparison would be your car A/C & heat. Using it to demist the
windshield the outside temp is say 50 and humidity is high and the people in
the car are too. The defroster will be used and you will turn up the heat
because your nipples are popping. The outside air is run the a/c then the
heater coil warms it. You are comfy and fog is gone from the windows. The a/c
is condensing the humidity by dropping the temperature and the heater is
warming it for comfort.
--
Tekkie - I approve this advertisement/statement/utterance.
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Posted by DIMwit on June 27, 2008, 6:18 am
show/hide quoted text
> Graven Water posted for all of us...
>> > What if it's too cold to run the AC,
>> > yet warm enough so the heater isn't drying the air much? Say it's
>> > 60F, and the humidity without any AC is 70%. I would want to heat at
>> > that temperature, not cooling! If you run the AC, won't it have
>> > to be cooling things down to 55F?
>> Is the answer to this riddle, perhaps that the water-holding capacity of
>> air increases very quickly with temperature? It does, I looked at a
>> graph.
>> So there might be a rather narrow window of temperatures where it's too
>> cold to use the AC and too warm for the heater to dehumidify well.
>> There would be such a window, unless you're willing to shiver with the AC
>> or overheat the house for the sake of dehumidifying. But maybe it's a
>> narrow
>> range of temperatures.
>> Laura
> A good comparison would be your car A/C & heat. Using it to demist the
> windshield the outside temp is say 50 and humidity is high and the people
> in
> the car are too. The defroster will be used and you will turn up the heat
> because your nipples are popping. The outside air is run the a/c then the
> heater coil warms it. You are comfy and fog is gone from the windows.
> The a/c
> is condensing the humidity by dropping the temperature and the heater is
> warming it for comfort.
> --
> Tekkie - I approve this advertisement/statement/utterance.
good explanation, but it it involved a possible DUI. need to do a drug test
on her too.
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> yet warm enough so the heater isn't drying the air much? Say it's
> 60F, and the humidity without any AC is 70%. I would want to heat at
> that temperature, not cooling! If you run the AC, won't it have
> to be cooling things down to 55F?