Different question about heater bars

[Richard Brekne]

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Grin... Really Terry I think we are both very much on the same track... I
am a bit argumentative by nature.. and get easily hung up on words and ways
of describeing things. Im sure that if you and I sat down over a bottle of
Glenmorange and hashed out just what we mean and mean to know about this
that we'd end up looking at each other with that particular whishky induced
grin and say something to the effect of.. "Thats what I have been saying
all along".

Farrell wrote:

>  Genius or not, Forestologist or not, trustworthy or not, right or wrong,
> maybe we should just ask ......did someone ask a question about "drawing
> moisture" from a soundboard"?
>
> Didnt read that question exactly like that you see... put it in the whole
> sentence perspective it came out to  me more like... "Does Damp Chaser
> work by drawing moisture out of the soundboard"... Immediately my little
> finger goes up and says.... yes.... but its not that simple... you'll
> learn to ignore this kinda thing in me after a while.. grin.
>
> Should we just wait and see if there is a need for any more enlightening
> discussion? Where are you on this? I have a sneaky suspicion what the
> results of a vote would suggest! Maybe a truce until we hear from Ruth
> Phillips? It sounded like she had something concrete on her mind.
> Later! Terry Farrell
> Piano Tuning & Service
> Tampa, Florida
> mfarrel2@tampabay.rr.com
>
>      ----- Original Message -----
>      From: Richard Brekne
>      To: pianotech@ptg.org
>      Sent: Thursday, October 19, 2000 6:18 AM
>      Subject: Re: Different question about heater bars
>
>
>
>      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.
>
--
Richard Brekne
RPT, N.P.T.F.
Bergen, Norway


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