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Relative Humidity Data #2744014
06/12/18 10:56 PM
06/12/18 10:56 PM
Joined: Jun 2018
Posts: 3
K
KE8JZL Offline OP
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KE8JZL  Offline OP
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Joined: Jun 2018
Posts: 3
Hello (Piano) World. This is my first post, but I’ve lurked around here a bit.

I tune the piano at my church, and it tends to go out of tune quicker than other pianos I tune. I was wondering how much of that is due to fluctuations in relative humidity, so I logged RH and temperature data for a few months (see picture below). The church building isn’t used much during the week, so the HVAC is usually set differently during the week than the weekend. The piano has a dehumidifier bar, but that wasn’t plugged in while I was taking these data. The RH fluctuations look pretty significant to me, but I’d like to get some other opinions.

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Re: Relative Humidity Data [Re: KE8JZL] #2744016
06/12/18 11:07 PM
06/12/18 11:07 PM
Joined: May 2011
Posts: 206
Fayetteville, GA
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mivaldes Offline
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Seems like pretty big variations in RH to me. I'd love to see this graph with the dehumidifier bar.


Marcus Valdes
Fayetteville, GA
Kawai RX-5, Kawai CA78
Re: Relative Humidity Data [Re: KE8JZL] #2744020
06/12/18 11:44 PM
06/12/18 11:44 PM
Joined: May 2006
Posts: 4,536
Georgia, USA
terminaldegree Offline
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terminaldegree  Offline
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If correct, that’s absurdly dry for much of the time. Definitely low enough to cause significant damage and premature aging.


Pianist, teacher, apprentice technician, internet addict.
Piano Review Editor - Acoustic and Digital Piano Buyer
Re: Relative Humidity Data [Re: KE8JZL] #2744074
06/13/18 07:15 AM
06/13/18 07:15 AM
Joined: Feb 2017
Posts: 1,526
New Hampshire
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P W Grey Offline
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P W Grey  Offline
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Joined: Feb 2017
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New Hampshire
The dehumidifier rod should be wired to a humidistat of course.

Pwg


Peter W. Grey, RPT
New Hampshire Seacoast
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Re: Relative Humidity Data [Re: KE8JZL] #2744100
06/13/18 09:44 AM
06/13/18 09:44 AM
Joined: Oct 2017
Posts: 299
Europe
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arc7urus Offline
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Europe
Can I ask where was this measured? Is the measuring equipment working properly? I do wonder how you measured multiple RH values below and around 20% with an air temperature of 18 - 20 C. That is an extremely low value for RH at that temperature.

Re: Relative Humidity Data [Re: arc7urus] #2744103
06/13/18 10:02 AM
06/13/18 10:02 AM
Joined: Apr 2010
Posts: 1,886
Michigan
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kpembrook Offline
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K
Joined: Apr 2010
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Michigan
Originally Posted by arc7urus
Can I ask where was this measured? Is the measuring equipment working properly? I do wonder how you measured multiple RH values below and around 20% with an air temperature of 18 - 20 C. That is an extremely low value for RH at that temperature.


Get's down to 10% in the winter here in USA upper midwest.


Keith Akins, RPT
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Re: Relative Humidity Data [Re: kpembrook] #2744114
06/13/18 10:49 AM
06/13/18 10:49 AM
Joined: Oct 2017
Posts: 299
Europe
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arc7urus Offline
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Originally Posted by kpembrook
Originally Posted by arc7urus
Can I ask where was this measured? Is the measuring equipment working properly? I do wonder how you measured multiple RH values below and around 20% with an air temperature of 18 - 20 C. That is an extremely low value for RH at that temperature.


Get's down to 10% in the winter here in USA upper midwest.


Yes, that is why I am curious about the location. Assuming the readings are correct, RH values that low require to be in a cold and dry place (like central/upper USA) and then to heat the air inside the building/room which would further decrease the RH. But if the location is not naturally very dry then you would need a kind of industrial dehumidifier setup to get those RH values...

Re: Relative Humidity Data [Re: arc7urus] #2744195
06/13/18 04:53 PM
06/13/18 04:53 PM
Joined: Jun 2018
Posts: 3
K
KE8JZL Offline OP
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KE8JZL  Offline OP
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Joined: Jun 2018
Posts: 3
Originally Posted by arc7urus
Originally Posted by kpembrook
Originally Posted by arc7urus
Can I ask where was this measured? Is the measuring equipment working properly? I do wonder how you measured multiple RH values below and around 20% with an air temperature of 18 - 20 C. That is an extremely low value for RH at that temperature.


Get's down to 10% in the winter here in USA upper midwest.


Yes, that is why I am curious about the location. Assuming the readings are correct, RH values that low require to be in a cold and dry place (like central/upper USA) and then to heat the air inside the building/room which would further decrease the RH. But if the location is not naturally very dry then you would need a kind of industrial dehumidifier setup to get those RH values...


I can't say for certain if the equipment is working properly. It's about 3 years out of calibration and I haven't used any other equipment to verify its readings. However, I am in Michigan and it was winter when I started logging, so the data are pretty consistent with Keith's comment.

Re: Relative Humidity Data [Re: KE8JZL] #2744344
06/14/18 08:31 AM
06/14/18 08:31 AM
Joined: Mar 2017
Posts: 66
Middle Atlantic
J
Joe302 Offline
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Joe302  Offline
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Joined: Mar 2017
Posts: 66
Middle Atlantic
You should consider monitoring both the outside temp and RH and the inside temp and RH.
Consider that the HVAC system used by the church provides basic cooling and heating operation.

Having dehumdification and humidification capabilities would be too expensive a system in such a setting.
Also, consider how often doors and windows are open and how tightly they seal when closed.

As a result, the temp and RH outside can have a substantial impact on inside conditions.
Comparing this data will help you better understand changes in interior conditions.


Proud owner of a Kawai KU-5D 52 inch professional upright.
Re: Relative Humidity Data [Re: KE8JZL] #2744580
06/14/18 11:14 PM
06/14/18 11:14 PM
Joined: Jun 2001
Posts: 4,742
Florida
B
Bob Offline
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Bob  Offline
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B
Joined: Jun 2001
Posts: 4,742
Florida
Looks like a normal RH graph from Michigan to me. The room is over heated to 75 F in the winter, causing low RH. If the church set the temp to 50 F in the winter unless people are there, the RH would be higher, in the 30% range. In this scenario, the pitch would drop 20 cents in winter, only to go 20 cents sharp in summer when the RH increased.


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