On Sun, Aug 30, 2009 at 6:22 PM, Ron Nossaman <rnossaman at cox.net> wrote: > Dean May wrote: > > You are correct, Ron, that numbers like that do present problems for tuning >> stability. But that isn't really what the discussion between us has been >> about. You refuse to acknowledge that a/c air coming out of the vent is at >> a >> very high RH. Even here you forcefully assert that it makes no difference >> where the vent is in relation to the piano. >> > > I don't refuse to acknowledge it at all. Air chilled to the dew point will > HAVE to have a very high RH% if chilling it produced any moisture runoff. > I've been unsuccessfully trying to point out to you that RH% is NOT the same > as MC, and raising the RH% by chilling does NOT increase the absolute > moisture content of air. The fact that the A/C is producing water proves > that the air coming out has a lower moisture content than the air going in. > That's it. > > > One of the pianos I previously spoke of encountering with the a/c blowing >> on >> it had a full dampchaser system with a back cover. Yet it was still going >> substantially sharp. If I am to take your advice then, the a/c vent >> blowing >> on it is of no consideration. >> > > I won't chase details with you based on a false premise, but I don't > advocate either a heating or cooling duct dumping directly into a piano, > whatever the RH%, and never have. Any more words you'd like to put into my > mouth, or can we get reasonable about this? > Ron N > Hi Dean, Ron & Terry, I've been following this discussion when I've looked in on the list but I've had no time to do no more than take a quick look. I had 2 grand actions I was replacing hammers, shanks & flanges on for a high school and middle school to have finished, regulated & for the opening day of school today. Mission accomplished used the new carbon fiber shanks and flanges on both, 30 YO Yamah C5 and a 1924 Packard. I live in the SW Wisconsin 12 miles from the Mississippi, the LaCrosse river runs about a 1/2 mile from my home and the Black river is about 5 miles away. I do a lot of work in Tomah/Warrens area which is the Cranberry Capital of Wisconsin. I have postd before about the high school in Tomah, they drained a swamp to obtain the land to build it on. I will begin by saying I agree with everything Ron has said to this point. My son works in the HVAC field so what I hadn't gleaned after 30 years in the business he's filled in over the last 11. Large commercial buildings, like the high school I mentioned above and the Radisson hotel in downtown LaCrosse, WI with a swimming pool indoors do not use a conventional type AC with freon/ condensor etc. The systems they use are called chilled water systems, which (simplifying for the sake of brevity)pump cold water from deep in the earth up through pipes which run the water through a radiator type manifold through which a fan blows air, cooling it. The result is cool, humid air which feels colder than regular A/C and of course is harder on our pianos and their tuning. The Radisson, for example is built of reinforced concrete with the aforementioned indoor pool it is 2 blocks from the Mississippi and uses one of these chilled water systems. The Kawai GE-1 grand has a Dampp-Chaser system in it and had a full cover until they washed it, they won't buy a new one, the manager thinks it looks prettier without it!! They purchased a UST-7 at the same time they bought the grand but due to the conditions in the building had to replace it with a UST-8 about 9 years ago. Tomah high school just bought new P-22's, the new P-22's they bought in '86 are worn out, partly due to building conditions, partly to high usage. Mike -- I intend to live forever. So far, so good. Steven Wright Michael Magness Magness Piano Service 608-786-4404 www.IFixPianos.com email mike at ifixpianos.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20090901/7f184098/attachment-0001.htm>
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