D-C 25 watt rods

[Greg Newell]

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Dean,
         All this is well and good and I'm sure that I incorrectly used the=
=20
BTU terminology however my point remains the same. Grab the shorter bar and=
=20
it's too hot to hold. Grab the longer bar and you can hold it all day. That=
=20
would seem to produce an imbalance to me. I can't seem to wrap my mind=20
around any other outcome, air currents not withstanding.

Greg






At 08:55 PM 2/13/2004, you wrote:

>A watt is a power unit, like horsepower. A BTU is a heat or energy unit.=20
>Power is energy sustained over time, as in so many btu=92s per hour. So if=
=20
>we are starting with a power unit, watts in this case, we multiply by=20
>a  time unit to get how much total energy is produced. 1 btu/min =3D 17.57=
=20
>watts or 1 btu =3D 17.57watt-minutes. So to convert 25 watts burned over=
 one=20
>hour to btus:
>
>25 watts X 60 minutes / 17.57 watt-minutes/BTU =3D 85 BTU
>
>So a 25 watt D-chaser bar burning for one hour produces 85 BTU=92s of heat.=
=20
>Notice the length of the bar does not enter the equation. Since the=20
>shorter bar has to dissipate the same amount of heat in a shorter length,=
=20
>it stabilizes at a higher temperature. But the total heat produced is the=
=20
>same.
>
>Dean
>
>Dean May             cell 812.239.3359
>PianoRebuilders.com   812.235.5272
>Terre Haute IN  47802
>
>-----Original Message-----
>From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]On=20
>Behalf Of Greg Newell
>Sent: Friday, February 13, 2004 6:19 PM
>To: Pianotech
>Subject: Re: D-C 25 watt rods
>
>John,
>         I looked at this somewhat differently than you describe below. I=
=20
> am not looking at 25 watts as 25 BTU's but rather just how much energy is=
=20
> being used by the rod. Since the short one and the long one use the same=
=20
> amount of electricity but are in fact different in size they it seems to=
=20
> follow that they would produce a different amount of heat. This is where=
=20
> 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=20
>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=20
>powers some cars. I would think that as a motorcycle, it would appear to=20
>have more power, than the same engine pushing a car.
>Best regards,
>John M. Ross
>Windsor, Nova Scotia, Canada
><mailto:jrpiano@win.eastlink.ca>jrpiano@win.eastlink.ca
>----- Original Message -----
>From: <mailto:gnewell@ameritech.net>Greg Newell
>To: <mailto:webb50@comcast.net>Ruth Phillips ;=20
><mailto:pianotech@ptg.org>Pianotech
>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=
=20
> I had hoped it, I believe, had the desired result. While Ruth Phillips=20
> mentions below that the 25Watt Rod was discontinued as a system staple I=
=20
> have to disagree. The part number G6PS (top item on page 22 of the Jansen=
=20
> catalogue includes both a 2' and a 4' 25 watt rod. I also disagree with=20
> others that posted (Don I think it was) who said that the two rods=20
> producing very different amounts of heat would not necessarily produce an=
=20
> imbalance. I paraphrased to clarify my point but I can't see how it could=
=20
> be anything but. Don's argument was that I did not take into account=20
> convection currents. It would seem to me that if one was too hot to hold=
=20
> and the other could be held all day being only luke warm then any=20
> convection currents would be more in the category of WIND to not produce=
=20
> an imbalance. I can agree with others who have posted that they never=20
> noticed any problems. Neither have I. Even though the two bars produce an=
=20
> entirely different amount of heat they are not necessarily doing damage.=
=20
> It seems that it could certainly be said, however, that they are not=20
> 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.
>On the soundboard, once compression has taken place, drying the wood is=20
>not going to make it disappear.  When you install a system you will find=20
>that the wood changes - that is about all you can say with=20
>certainty.  With the right equipment, properly installed, the system will=
=20
>stabilize the wood.  Once it stabilizes, you can make corrections based on=
=20
>what you find at that point.  It may take some time as there will be=20
>residual change, such as there is when you change pitch.  Every change=20
>causes reactions, and you keep at it until the change is so miniscule that=
=20
>the reaction is meaningless.
>I hope this helps to clarify what you found.
>Ruth Phillips
>
>
>Greg Newell
>Greg's piano Fort=E9
>mailto:gnewell@ameritech.net
>
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>Greg Newell
>Greg's piano Fort=E9
>mailto:gnewell@ameritech.net
>
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Greg Newell
Greg's piano Fort=E9
mailto:gnewell@ameritech.net=20

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