DC Study - was Another heater bar without a control...

[Farrell]

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Terry Farrell
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----- Original Message -----=20
From: "Isaac OLEG" <oleg-i@wanadoo.fr>
To: <pianotech@ptg.org>
Sent: Tuesday, July 30, 2002 8:06 AM
Subject: RE: DC Study - was Another heater bar without a control...


> I believe that any DC system installed may be well dimensioned in
> regard of the conditions of the room, the piano type, etc.
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> I have a very precise electronic R.H. tester (0.1 %precision with
> external gauge) and I remember that I checked a simple 30W element in
> a little Yamaha 108 vertical, that I installed in a very moist place
> under the house.

I'm having trouble picturing this. Was the DC bar, or the piano =
installed under the house? I know I've gotta be missing something here.
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> I came back 1 month later and checked inside the piano and in the
> room. The heater was permanent for this test, and , probably because
> no air flow in the piano and not enough power, the R.H level was AT
> THIS TIME higher in the piano than in the room (63% in the piano while
> 58% in the room if I remember correctly).
> I was very surprised, but I believe it was only because the room had
> been opened, or it was in a more dry time, and the piano did not have
> enough time yet to stabilize to the dryer climate. But it was evident
> then than the heater element was not strong enough for this case.
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> Of course that does not mean the system, if correctly dimensioned,
> would not work, but if the humidity is too high, having not enough
> heat in the dehumidifiers will may be create more hot warm air than
> dry one.

Hmmmmm.

> I believe too that there may be a relation with the flow of air, if
> the same air is recycled always in a somewhat close environment, I
> can't see how the moisture can go out. It have to swell thru the
> parts, the felts, the case, so may not it be necessary to have some
> apertures to allow for air circulation ? (not sure at this one)

If the piano had equilibrated with the room humidity, no. If, by chance, =
the piano was very moist (left out in the rain?), then yes, I would =
indeed benefit to have some air circulation. But under normal =
circumstances, no.
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> I installed recently a 3 bars system in a 68% place under a little
> grand, and indeed 1 hour after plug in, there was a nice 43% place
> just under the soundboard
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> A chart with information on how much temp/R.H may relate with how much
> power (in Watt) could be very helpful for choosing components.
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> Any thoughts ?

You bet! Plug an old-type mechanical clock into the humidistat along =
with the heater bars. Observe the clock over time to see how long the =
system has been running. With the room near the maximum humidity range, =
make sure the DC system shuts off once in a while. That way you know you =
have just enough power to maintain RH at whatever the shut-off point of =
the humidistat is.
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> Regards.
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> Isaac OLEG
> France
> Well tempered climate (not tuning!)
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> > -----Message d'origine-----
> > De : owner-pianotech@ptg.org
> > [mailto:owner-pianotech@ptg.org]De la part
> > de G GRAVINA
> > Envoye : mardi 30 juillet 2002 12:45
> > A : pianotech@ptg.org
> > Objet : DC Study - was Another heater bar without a control...
> >
> >
> > Matt W wrote:
> >
> > >I would be willing to participate in data collection with you
> > >Jerry.  Although I sound pretty biased against this
> > hardware,  I can be at
> > >once skeptical and at the same time open-minded.  In my
> > opinion, any study
> > >should involve at least one pair of pianos - one for the
> > hardware and an
> > >"untreated" piano as a control.  The pianos should also be
> > left untouched,
> > >so as to avoid any data contamination through tampering.
> > Unfortunately, I
> > >don't know of anywhere where this condition exists, except
> > maybe for a
> > >store with a storage facility, which might involve rental
> > and storage fees.
> > >
> > >Gotta keep it interesting
> > >
> > >Matt
> >
> > Folks,
> >
> > If one were to set up such a study, what other parameters,
> > controls,
> > frequency of data collection, length of study, etc., should
> > be considered?
> >
> > Jerry Gravina, RPT
> > Babylon, NY
> >
> >
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