[Greenbuilding] radiant windows

[Peter Kidd]

agreeing with Alan Abrams except no laws are broken, just transparency
or probably the understanding of the proponent.  It just transfers where
the heat loss comes from, which energy (or heating) source, and assumes
the window can achieve a temperature higher than "room temperature",
i.e. has enough capacity to meet that demand. It's incorrect to say the
R-value changes, at least an R to recognized Standards, rather than some
notional R that benefits from an energy input hidden inside the equation
so to speak.  

On 2014-10-22 06:25 AM, Alan Abrams wrote:
> seems like the same argument for insulation under a radiant slab would
> apply: you would be providing a source of heat adjacent to a heat sink with
> an infinite capacity. But I would defer to any physicist who could explain
> the mechanics better--that is, how much heat energy is radiated and
> conducted back into the room, vs how much is radiated and conducted to the
> exterior. I am particularly troubled by the assertions that:
>
>
>    - When the temperature of the glass exceeds the inside air temp by 3-5
>    dF, the windows become opaque to heat loss
>    - The R-values of the windows increase and then exceed the R-value of
>    the walls
>
> On the face of it, it sounds like ArcClad has discovered a way to suspend
> some important Laws.
>
> -AA
>
> Alan Abrams
>
> *certified professional building designer, AIBDcertified passive house
> consultant, PHIUS*
> *certified passive house builder, PHIUS*
> cell     202-437-8583
> alan at abramsdesignbuild.com
> HELICON WORKS *Achitecture and Education*
> <http://www.heliconworks.com/index2.html>
>
> On Tue, Oct 21, 2014 at 3:56 PM, Vadurro, Rob, EMNRD <
> rob.vadurro at state.nm.us> wrote:
>
>>  Anybody have any experience with electric radiant windows?:
>>
>> http://radiantwindowtech.blogspot.com/
>>
>> Sounds like an energy hog, but maybe not?
>>
>>
>>
>> Rob Vadurro, AIA
>>
>> Park Architect
>>
>> New Mexico State Parks
>>
>> 1220 South Saint Francis Drive
>>
>> Santa Fe, NM 87505
>>
>> 505-476-3383
>>
>> 505-476-3361 fax
>>
>>
>>
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>
>
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