fresh home build coming soon

[skyking]

Holes in the webs, some are drilled @2" but now I am getting some 1 3/8" bushings.
Viega part:





I'll still need bigger holes for returns and runs out to the loop locations.
for those locations I can arrange a few mouse ears like this around the periphery of the hole for multiple runs.

Here is a screencap of the BC Calc analysis of the joists on the far side of the beam from that perspective. I have drilled the 2" holes on the far end but not the near end.


The first floor will have ~11 loops going to a couple of remote manifolds.
When I started out I planned on home runs with 1/2" PEX.
After much research and consultation with radiant heat guys, now I am using 3/8".
The 1/2" you can get out to about 300' max and 250' practical loop length.
The 3/8" is really best at 200' or less.
Home runs to the equipment room burn up so much of the working length that remote manifolds make more sense.

 

[JTsyo]

Do they make electric floor heaters instead of water if you're gong full solar?

 

[skyking]

Do they make electric floor heaters instead of water if you're gong full solar?

They do, but I have not seen large scale installations that way. I have heat wire under our current home's bathroom tiles, for example.
It would be far less efficient though. Heat pumps are money savers.
Typical Coefficient of Performance (COP) is above 3.
That means 3x the heat you would get from direct resistance heating.
My inverter ground source heat pump can get up to a COP of 5 if I can manage my ground loop temperatures.

 

[fosterff]

Heat pumps are money savers.

What? What brand do you use?

 

[skyking]

First loop is up!

Taking a break now, Daisy is helping.

 

[Sukhoi]

Ah I didn't realize the metal is a heat spreader

 

[skyking]

Ah I didn't realize the metal is a heat spreader

Yes, this image says it all. I have a product like those two on the right. It is not just a heat spreader. The heat is just fine traveling through the tube and back to the heat pump.
It does not just jump out of there to do your bidding
The tubing is hammered into the extrusion which EXTRACTS the heat out of the water. Without that tight grip they would not work like they do. This also keeps the tubing from moving around and making noise. It grows about 1% in length for every 50 degrees of heat rise. The extrusion contains it.
The images on the right are tight extrusions.