[pianotech] Protection from underfloor heating

[Susan Kline]

If I have even a glimpse of how this works, infrared is a form of light, 
and
when it shines on a mass, the mass gets warmer. That's why my masonry stove
can heat me while the air is still not all that warm. And I think that's 
why
the bakeoven (which is the firebox, but after a fire is finished) does such
a great job of cooking: it heats whatever you put into it in three ways: by
contact with the floor of the oven, by convection around the container, and
by radiation in the infrared, from the firebrick floor, sides, and top.

It's been awhile since I studied this, but I do know that sitting in a room
with hot soapstone panels radiating into it is more satisfying than 
heating the air and
sending it through floor vents.

Susan Kline

Dean May wrote:
> 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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>
>   
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