[pianotech] Protection from underfloor heating

[Dean May]

The air in the thermals of which you speak is not heated by radiant heat. If
air was significantly heated by radiant heat than the upper atmosphere would
be very warm, not cold. The radiant heat of the sun heats the mass of the
earth, and that is what heats the air and creates the thermals. 

I have hot water heat, and while it is true, they are designed to heat air
by convection, it is also true that a 72 degree room with cast iron hot
water radiators feels warmer than a 72 degree room heated by forced air. The
cast iron at 95-135 degrees radiates a lot of warmth that is not transmitted
by the air. 

Dean
Dean W May                (812) 235-5272 voice and text 
PianoRebuilders.com    (888) DEAN-MAY        
Terre Haute IN 47802

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Ron Nossaman
Sent: Tuesday, December 11, 2012 9:59 AM
To: pianotech at ptg.org
Subject: Re: [pianotech] Protection from underfloor heating

On 12/11/2012 8:40 AM, Dean May wrote:
> Radiant heat works not by warming the air, though there is some of that,
but
> by radiating the heat, duh. ;-)

It's misnamed. It's only radiant to a small degree (sorry). It primarily 
warms the air, like a radiator (also misnamed) which circulates by 
convection. The radiator, granted radiates much more because it operates 
at a much higher temperature.


>Objects with mass in view of the radiant
> heat source absorb the heat and began to warm in temperature. The closer
the
> object to the source, the more heat is absorbed. A piano with lots of mass
> sitting very close to the source will absorb lots of heat. While air, with
> negligible mass, will not absorb much heat. So measuring the air's
> temperature will not be any kind of indicator as to how much heat the
piano
> is getting.

Talk to desert glider pilots and buzzards about thermals some day.
Ron N


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