## Maintain 50% Relative Humidity To Reduce Home Heat Loss

Expand Messages
• Heat conductance or resistance (R) to heat transfer doubles with each 10% drop in relative humidity (RH) of most materials. A ceiling with a rating of R30 at
Message 1 of 6 , Mar 24, 2008
• 0 Attachment
Heat conductance or resistance (R) to heat transfer doubles with each
10% drop in relative humidity (RH) of most materials. A ceiling with
a rating of R30 at 40%RH would be R15 at 50%RH or R7.5 at 60%RH or
R3.75 at 70%RH. So R30 insulation is installed in the house but heat
loss is equal to R4 if the relative humidity (RH) is 80%. Corn
stoves are ideal for heating log homes because the steady temperature
over two weeks time will improve the R value indicated. Green logs
or logs with high RH will conduct heat to the outside. Dry logs
become super insulators.

> Does this concept explain why the corn stove will gradually use
less and less fuel after running a few days even though the weather
is getting colder?
>
> > %RH Temp Dew Point
>
> > 100 60F 60F
> > 90% 63F 60F
> > 80% 66F 60F
> > 75% 68F 60F
> > 70% 70F 60F
> > 60% 75F 60F
> > 50% 80F 60F
> > 50% 70F 50F
>
• For a corn stove the room can maintain the specified relative humidity simply by holding the temperature steady at the following temperature. The relative
Message 2 of 6 , Jul 24, 2008
• 0 Attachment
For a corn stove the room can maintain the specified relative
humidity simply by holding the temperature steady at the following
temperature. The relative humidity can be changed by simply bumping
the room temperature to the value shown. This is assuming the dew
point of the room air remains steady at 60 deg F.

%RH Room Temp (deg F)
100%RH 60F
90%RH 63F
80%RH 66F
75%RH 68F
70%RH 70F
60%RH 75F
50%RH 80F
50%RH 70F if dew point is 50F instead of 60F

At 50% RH, the room temperature could be held ten degrees less if the
room air was dry enough to drop the room dew point from 60F to 50F.

Conversly, boiling enough water on the stove to raise the dew point
ten degrees would require the room temperature to be raised ten
degrees to maintain 50% RH.

Boiling water on the stove makes one feel warmer because the added
moisture will increase the room RH. BUT boiling water on the stove to
make one feel warm will WASTE ENERGY and INCREASE THE HEAT BILL. The
same amount of energy that it took to boil the water will be lost to
the outside when (not if) the moist warm air leaks outside.

A corn stove is more efficient if it is not supplemented with set
point heat. The 50%RH room air that leaks to the outside is low
energy dry air. A room at 80% RH is leaking high energy air to the
outside. Think about how much energy the stove takes to boil enough
water to raise the rh to 80%. That's a lot of wasted energy.

Maintain 50% RH with a corn stove. 50%RH is much more comfortable
than a murky 80% to 90% RH. When 50% RH air is lost to the outside,
there really isn't much energy lost at low RH.

mymonavie.com/tinytom
>
>
>
______________________________________________________________________
______________
> http://www.yahoo.com/r/hs
>
• To afford heat in an old leaky farm house, a leaky facility needs a corn stove. Dry air holds little energy and cost less to heat so if dry air all leaks out,
Message 3 of 6 , Oct 23, 2008
• 0 Attachment
To afford heat in an old leaky farm house, a leaky facility needs a
corn stove. Dry air holds little energy and cost less to heat so if
dry air all leaks out, it doesn't cost much to heat the dry air that
got lost. It is no wonder how much we spent boiling hot water on the
kitchen stove so we could cut the room temperature down thinking
falsely we were saving money freezing to death.
Unlike most professionals, the farmer that thought this up is
outstanding in his field.

--- In cornplace@yahoogroups.com, "tinytom.com" <tinytomxs@...> wrote:
>
> thanx for info. probably answers alot of my customer's
> questions. tiny.
> --- amaizablazecornstoves
> <amaizablazecornstoves@...> wrote:
>
> > Two or Three degree temp increase will drop the RH
> > 5% to 10%!! That's
> > amaizing! So to get to 50% RH, just bump the temp
> > slightly with a
> > corn stove.
> >
> > So humidifiers and dehumidifiers are not needed with
> > the corn stove.
> > Simply adjust the temp slightly and the RH will
> >
> > That's why RH can not be controlled with HVAC
> > systems that are
> > constantly swinging temperature about a set point.
> > When the HVAC
> > cycles off, as the temp cools down the RH swings up
> > by 30%. When the
> > HVAC cycles back on again, the RH swing 30% down
> > again. Wonder what
> > the RH swings do to human skin? Sinuses? Viruses?
> > Germ propagation?
> >
> > My old HVAC swings the temp almost ten degrees at
> > times. The RH
> > would be swinging at least 30%!!!!
> > No wonder we had a humidifier in one room and a
> > dehumidifier in
> > another room all running simultaneously!!
> >
> > Does this concept explain why the corn stove will
> > fuel after running a few days even though the
> > weather is getting
> > colder?
> >
> > > %RH Temp Dew Point
> >
> > > 100 60F 60F
> > > 90% 63F 60F
> > > 80% 66F 60F
> > > 75% 68F 60F
> > > 70% 70F 60F
> > > 60% 75F 60F
> > > 50% 80F 60F
> > > 50% 70F 50F
> >
> >
> >
>
>
>
mymonavie.com/tinytom
chimneysweepUSA.com tinytom.com
>
>
>
______________________________________________________________________
______________