Where did the RH Go

[Don]

Hi Sarah,

Or else there was outside air infiltrating into the room. This is far more
likely in an old house. It's really quite dramatic to do the calculation of
outside air at 70% relative humidity at -15 C and bring it into a house
raising the temperature to 20 C. 

Have a look here:

http://members.nuvox.net/~on.jwclymer/rh.html


At 03:26 PM 1/13/2004 -0500, you wrote:
>Hi Bill,
>
>> >House heating method?
>>
>> Steam radiators, which were cool all during the time I was there (and
>> the temperature was holding steady while the RH was tumbling). I need
>> to get the details of the house insulation from the owner. As well as
>> sell her a DC!
>
>If....
>
>(1) It was cold outside, and
>(2) there was no insulation in the walls, and
>(3) the radiators in the room were not active, and
>(4) it was still warm (and stable) inside the room,
>
>then there had to be some considerable source of external heat.  I can only
>conclude that the room received a substantial flow of warm (and dry) air
>from the rest of the house.  I think there's no need to look further for the
>answer to the plummeting RH mystery.  ;-)
>
>Peace,
>Sarah
>
>PS I didn't have time to refill my humidifier this morning -- places to go.
>It went 7+ hours without shedding a drop of water into the air.  When I
>returned, the RH had dropped about 1%.  Same temperature. YMMV
>
>_______________________________________________
>pianotech list info: https://www.moypiano.com/resources/#archives
>
>

Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.

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