Different question about heater bars

[Richard Brekne]

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Farrell wrote:

> "This humidity thing is always fun... and dont worry... even if I am
> blowing air out of my better end,,, I still enjoy the conversation..
> grin."
>
> Me also!........But. Look at Dampp-Chaser marketing propaganda. All their
> graphs about soundboards. Now I don't really think that they truely
> represent the results of any particular experiment, but rather trends
> they are trying to exemplify (although I do believe they should state
> that some of the data in their brochure might be a bit idealized).
> Anyhow, as the RH decreases in air in a piano, the soundboard Moisture
> Content also declines. Moisture content is water in wood. Lower moisture
> content means less water in wood. That means the water left the wood. It
> is no longer there. It does not have anything to do with the amount of
> water the wood may be able to hold (like RH). This is a central issue in
> wood technology - manipulating the moisture content of wood.
>
> It really, really is true. You can trust me! I is edgeekated. I got me a
> deegree in Forestry (two lives ago)! So there! Top that!   ;-)
>
>> Terry Farrell
>> Piano Tuning & Service
>

Terry... its not that I am saying that you are wrong in what you state...
its just an incomplete description. The question was something to the
affect of "does Dampchase work by drawing water out of the wood". My answer
was simply "not exactly". And that stands. The  picture is more complex
really, and to my mind of thinking a better description of what DampChaser
does..is the following. It attempts to set up and maintain a mini climate
in which the soundboard and the interior of the piano is included. This
climate is held at a RH of around 42 percent as best as the system is able
to achieve. How it does this is indeed a bit more complicated then saying
simply that it "draws moisture out of the panel".

DC, will draw moisture out of the wood, will heat the wood, and will lower
the RH in the wood. These three things interelate, until some kind of a
equillibrium in RH is achieved.

Look at it this way Terry,,  You heat the air in the piano, RH drops and
non-equillibrium is created and wood starts to respond by seeping out some
of its moisture... but then you have also heated up the wood, and its RH
drops also increasing its capacity to hold moisture. Its not going to want
to let go of so much of that moisture anymore... and if the woods capacity
to hold moisture exceeds that of the surrounding outside air it will want
some of that moisture... course it will also act as a heat radiator to some
degree which sets up the same kinda thing going on the back side, albiet to
a lesser degree.  Same happens with the air inside with relation to the air
outside. Actually, Damp Chaser will try and get this whole mini climate to
respond to the outside climate as one unit. Breathing in and out moisture
and heat as neccessary to maintain an RH in an average of 42 % which
dictates a wood moisture content that is conducive to pianos enjoying their
lives.

So... I say again... to say that Damp Chaser works by "drawing out moisture
from the soundboard" is not exactly right...

Trust me on this... I was born a genuis... Grin..

Great fun Terry.

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