D-C 25 watt rods

[Dean May]

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A watt is a power unit, like horsepower. A BTU is a heat or energy unit. =
Power is energy sustained over time, as in so many btu=92s per hour. So =
if we are starting with a power unit, watts in this case, we multiply by =
a  time unit to get how much total energy is produced. 1 btu/min =3D =
17.57 watts or 1 btu =3D 17.57watt-minutes. So to convert 25 watts =
burned over one hour to btus:
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25 watts X 60 minutes / 17.57 watt-minutes/BTU =3D 85 BTU
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So a 25 watt D-chaser bar burning for one hour produces 85 BTU=92s of =
heat. Notice the length of the bar does not enter the equation. Since =
the shorter bar has to dissipate the same amount of heat in a shorter =
length, it stabilizes at a higher temperature. But the total heat =
produced is the same.=20
=20
Dean
=20
Dean May             cell 812.239.3359
PianoRebuilders.com   812.235.5272
Terre Haute IN  47802
=20
-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]On =
Behalf Of Greg Newell
Sent: Friday, February 13, 2004 6:19 PM
To: Pianotech
Subject: Re: D-C 25 watt rods
=20
John,
        I looked at this somewhat differently than you describe below. I =
am not looking at 25 watts as 25 BTU's but rather just how much energy =
is being used by the rod. Since the short one and the long one use the =
same amount of electricity but are in fact different in size they it =
seems to follow that they would produce a different amount of heat. This =
is where my idea of an imbalance comes in. Is my thinking correct here?

Greg


At 03:51 PM 2/13/2004, you wrote:



Hi Greg,
25W concentrated in a short bar would feel hotter than, 25W in a long =
bar.
Just think, one has more area to heat, and greater dissipation, so feels =
cooler. The shorter bar has the heat concentrated, and would feel =
hotter.
I saw a picture of an 8 cylinder motorcycle, it was the same engine as =
powers some cars. I would think that as a motorcycle, it would appear to =
have more power, than the same engine pushing a car.
Best regards,
John M. Ross
Windsor, Nova Scotia, Canada
jrpiano@win.eastlink.ca <mailto:jrpiano@win.eastlink.ca>=20
----- Original Message -----=20
From: Greg Newell <mailto:gnewell@ameritech.net> =20
To: Ruth Phillips <mailto:webb50@comcast.net>  ; Pianotech =
<mailto:pianotech@ptg.org> =20
Sent: Friday, February 13, 2004 3:20 PM
Subject: Re: D-C 25 watt rods


Listers and Listees,
        Thank you for the feedback. While it is not as much discussion =
as I had hoped it, I believe, had the desired result. While Ruth =
Phillips mentions below that the 25Watt Rod was discontinued as a system =
staple I have to disagree. The part number G6PS (top item on page 22 of =
the Jansen catalogue includes both a 2' and a 4' 25 watt rod. I also =
disagree with others that posted (Don I think it was) who said that the =
two rods producing very different amounts of heat would not necessarily =
produce an imbalance. I paraphrased to clarify my point but I can't see =
how it could be anything but. Don's argument was that I did not take =
into account convection currents. It would seem to me that if one was =
too hot to hold and the other could be held all day being only luke warm =
then any convection currents would be more in the category of WIND to =
not produce an imbalance. I can agree with others who have posted that =
they never noticed any problems. Neither have I. Even though the two =
bars produce an entirely different amount of heat they are not =
necessarily doing damage. It seems that it could certainly be said, =
however, that they are not doing the best job possible. Any further =
thoughts?
Greg


At 06:25 PM 2/11/2004, you wrote:



Greg - the 25 watt rod was discontinued as a system staple long ago. =20
On the soundboard, once compression has taken place, drying the wood is =
not going to make it disappear.  When you install a system you will find =
that the wood changes - that is about all you can say with certainty.  =
With the right equipment, properly installed, the system will stabilize =
the wood.  Once it stabilizes, you can make corrections based on what =
you find at that point.  It may take some time as there will be residual =
change, such as there is when you change pitch.  Every change causes =
reactions, and you keep at it until the change is so miniscule that the =
reaction is meaningless.
I hope this helps to clarify what you found.
Ruth Phillips
=20
=20
Greg Newell
Greg's piano Fort=E9
mailto:gnewell@ameritech.net=20
  _____ =20

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Greg Newell
Greg's piano Fort=E9
mailto:gnewell@ameritech.net

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