[pianotech] Clarification Question: i'll take a pass

[David Ilvedson]

That's Dean's sweat...

David Ilvedson, RPT
Pacifica, CA  94044

----- Original message ----------------------------------------
From: "Ron Nossaman" <rnossaman at cox.net>
To: pianotech at ptg.org
Received: 8/28/2009 7:55:04 PM
Subject: Re: [pianotech] Clarification Question:  i'll take a pass


>Dean May wrote:
>>>> Relative humidity isn't absolute moisture content, it's temperature
>> related. 
>> 
>> Exactly
>> 
>>>> A/C exhaust is of a lower moisture content than the room air
>> 
>> This is not entirely accurate. Assuming constant barometric pressure, the
>> moisture content per pound of exhaust air vs. pound of room air (I'm talking
>> mass here, not volume) is the same (assuming steady state conditions). Think
>> about it, it is the same air, you aren't adding or taking away any moisture
>> at that point. The only difference is the temperature rises, making it
>> capable of holding more moisture, thus it goes to a lower RH by definition..

>It's accurate enough. If moisture isn't being taken from air 
>passing through the A/C, what's that dripping out the back of 
>the unit?
>Ron N