>a 5% change in > humidity is enough to cause the pitch of A4 to drift 4 cents. Oops. Sorry I missed that one. WOW! That's a lot! I did not realize that. Where does that figure come from? I would be very interested to see more such data. Thanks. Terry Farrell ----- Original Message ----- From: "Don" <drose@dlcwest.com> To: <pianotech@ptg.org> Sent: Saturday, July 07, 2001 8:58 PM Subject: Re: humidity control in homes > Hi Terry, > > I said in one of the posts about humidity control that a 5% change in > humidity is enough to cause the pitch of A4 to drift 4 cents. I did not > mention it is also enough to smear every unison in the piano. So 5% change > in humidity is actually too great for concert level tuning (that will > last). In ordinary homes a quality upright piano with DC system and back > cover may have pitch stability of less than 1 cent change in one year on > any note in the piano. > > It is true that such a house can be designd. Homes built for electric heat > qualify. Such buildings are *much* more expensive to heat and build. R-2000 > homes do not qualify as one of the requirements is an air to air heat > exchanger that in my climate causes dramatic and rapid changes in humidity > level. > > It is not the particular percentage of humidity that matters. It is the > change that matters. If you could keep a house at 20% year round or 55% > year round the piano would react in the same way it does with a humidity > control system installed. > > Accurate whole house control does happen. But it is a rare occurance. Like > finding a truely wonderful piano. > > At 08:12 PM 07/07/2001 -0400, you wrote: > >> It is simply nearly impossible in most areas to control a house to within > >> 5% humidiy year round. > > > >I should think most properly designed, sized, and installed residential-type > >whole house humidity control systems could keep humidity within 10% or so of > >a targeted RH. I would love to have that in my home. I would remove my > >Dampp-Chaser system in a second if I did. > > > >> Therefore whole house control is an impossible goal. > > > >Well, maybe impossible within 5%. Who said anything about that? Keeping RH > >within 10% or so of a targeted value is controlling RH. Therefore whole > >house RH control is indeed possible and practical (can be a bit expensive > >though). > > > >Terry Farrell > > > >----- Original Message ----- > >From: "Don" <drose@dlcwest.com> > >To: <pianotech@ptg.org> > >Sent: Saturday, July 07, 2001 12:45 PM > >Subject: humidity control in homes > > > > > >> Hi Terry, > >> > >> It is simply nearly impossible in most areas to control a house to within > >> 5% humidiy year round. Therefore whole house control is an impossible > >goal. > >> Sometimes with great effort a single room that has *no* exterior walls can > >> be controlled at that level. Talk to your local Art Gallery or Museum > >> conservatore. Properly designed Art Gallerys have three areas usually. One > >> that is almosst uncontrolled, a second inside that used as a *buffer* > >where > >> control is attempted, and finally an area where they go to the limit. But > >> even within those areas sometimes they use a special humidity controlled > >case. > >> > >> At 10:37 AM 07/07/2001 -0400, you wrote: > >> > > >> >Whole house humidity control is by far the best. Individual room humidity > >> >control would be second best. But keep in mind, room RH control is not > >> >accomplished by an unregulated humidifier from Eckard that is turned on > >> >manually when "it seems a bit dry in here". Good humidity control would > >be > >> >accomplished with an appropriate electronic device that controls an > >> >appropriate dehumidifier (or humidifier) that is capable of adjusting the > >RH > >> >in that room to the desired level. > >> > > >>Terry Farrell > > > Regards, > Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T. > > Tuner for the Saskatchewan Centre of the Arts > > mailto:drose@dlcwest.com > http://donrose.xoasis.com/ > > 3004 Grant Rd. > REGINA, SK > S4S 5G7 > 306-352-3620 or 1-888-29t-uner
This PTG archive page provided courtesy of Moy Piano Service, LLC