[Greenbuilding] PEX location in concrete slab

[Chris Green]

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.