[Greenbuilding] PEX location in concrete slab

[Keith Winston]

The AL on insulation is probably too thin to conduct significant heat 
any distance. Heat conduction is a function of the material, the 
cross-section, and the distance.

Keith


Chris Green wrote:
> answers at healthyheating.com wrote:
>   
>> Here's a FEA image for radiant tubes in a 4" slab located on the
>> insulation. Notice the quality of the surface temperature. 
>>
>> http://www.healthyheating.com/Page%2055/Images/Drawing2.jpg
>>
>>
>> Using ones imagination you could see how raising the tubes upwards
>> reduce the surface temperature quality by creating high and low
>> temperature points on the surface. 
>>     
> Thanks for the image.
>
> I am now wondering if the aluminum on the top of the foil covered 
> under-slab insul  might be functioning as a heat sink, drawing the heat 
> from the warmer regions under the PEX to the less warm areas between the 
> runs, and thereby helping to 'average out' the concentrations of heat a 
> bit?
>
> Is there any way to model this in one of your industry's computer 
> programs to compare it with other installation arrangements?
>
> Cheers,
> Chris Green.
>
>
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-- 
Keith Winston
Earth Sun Energy Systems
3927 Madison St.
Hyattsville, MD 20781
301-980-6325
keith at earthsunenergy.com
www.EarthSunEnergy.com