Y is hot dry air impossible/impractical?

Posted by Green Xenon [Radium] on September 29, 2008, 1:27 pm

On Aug 9, 8:02 pm, .p.jm@see_my_sig_for_address.com wrote in
http://groups.google.com/group/alt.hvac/msg/9646d0d0d4cfa110?hl=en :

> And when you heat a house, you do NOT want 'dry air'.

Why not? What's wrong with dry convective heating?

> Even
> if you could have it, which you can't.

What makes hot dry air impossible?

Posted by on September 29, 2008, 1:51 pm

On Mon, 29 Sep 2008 10:27:33 -0700 (PDT), "Green Xenon [Radium]"

>On Aug 9, 8:02 pm, .p.jm@see_my_sig_for_address.com wrote in
>http://groups.google.com/group/alt.hvac/msg/9646d0d0d4cfa110?hl=en :

>> And when you heat a house, you do NOT want 'dry air'.

>Why not? What's wrong with dry convective heating?

( sigh ) Go look up 'dry air'. It has nothing to do with the
heating or cooling source.

>> Even
>> if you could have it, which you can't.

>What makes hot dry air impossible?

An act of Congress. No sense fighting it.

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Posted by Green Xenon [Radium] on September 29, 2008, 8:45 pm

On Sep 29, 10:51 am, .p.jm@see_my_sig_for_address.com wrote:

> On Mon, 29 Sep 2008 10:27:33 -0700 (PDT), "Green Xenon [Radium]"

> >On Aug 9, 8:02 pm, .p.jm@see_my_sig_for_address.com wrote in
> >http://groups.google.com/group/alt.hvac/msg/9646d0d0d4cfa110?hl=en:

> >> And when you heat a house, you do NOT want 'dry air'.

> >Why not? What's wrong with dry convective heating?

> ( sigh ) Go look up 'dry air'. It has nothing to do with the
> heating or cooling source.

You said it would be impractical to heat a house with dry hot air.
Just how is dry hot air impractical?

By "dry air", I mean air that has little to no water molecules in it.

> >> Even
> >> if you could have it, which you can't.

> >What makes hot dry air impossible?

> An act of Congress. No sense fighting it.

Not funny. Please answer my question. Why is it impossible to have dry
hot air?

Posted by Stormin Mormon on September 30, 2008, 2:09 pm

Relative humidity depends to some extent on temperature. The same air
outdoors cold, moved indoors still has the same water per some volume of
air. Grams per meter, is it measured? However, at the warmer temp, the RH is
lower. And this is uncomfortable. During the winter, many home heating
systems add water to the air. The moist air feels warmer, because there is
less evaporation from your skin. Hot dry air is not practical because it
feels cooler.

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Learn more about Jesus
www.lds.org
.

news:341a0025-1576-43a8-8a91-

Not funny. Please answer my question. Why is it impossible to have dry
hot air?

Posted by Green Xenon [Radium] on September 30, 2008, 5:30 pm

On Sep 30, 11:09 am, "Stormin Mormon"

> Relative humidity depends to some extent on temperature. The same air
> outdoors cold, moved indoors still has the same water per some volume of
> air. Grams per meter, is it measured? However, at the warmer temp, the RH is
> lower. And this is uncomfortable. During the winter, many home heating
> systems add water to the air. The moist air feels warmer, because there is
> less evaporation from your skin. Hot dry air is not practical because it
> feels cooler.

Well, cold dry air also feels less cold than cold wet air at the same
temp.

I remember visiting a cave in Grand Canyon. The air was only 50
Fahrenheit but did not feel uncomfortably cold because the humidity
was only 5%. Now if the humidity was what it was outside the cave,
then I would be shivering.

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