setting flow rates on ufh

[vala]

I've decide to try and use the method shown in this video

to set the flow rates on my UFH manifold.

Initially the video shows how to perform the calculation to determine the floor output.
If this means the floor output you can expect to achieve shouldn't this also factor in the floor finish?

 

[Madrab]

Typically UFH output is detailed as watts per m2 and that is calculated with pipe distances against flow temp @ a certain flow rate.

The floor coverings don't come into that base equation though the thermal conductivity/tog could be then be calculated and the output per m2 suitably adjusted.

 

[vala]

@Madrab
What would be the calculation then for the way you describe?
On the video the calculation is floor temp - room temp to the power of 1.1. Then multiply this figure by 8.92.
There's more steps to then get the flow rate required.

Also how do I then calculate adding in the thermal conductivity/tog once I have the correct floor output?

Reason I ask is that I have UFH throughout, with a mix of floor coverings (polished concrete/carpet/tiles). Trying to see how the house copes with the same flow temp throughout.

 

[Madrab]

You need to know the pipe spacing as it has been set out and the size of pipe, that coupled with flow/return temps.

There are BS EN design standards and standard output tables for UFH as per standard designs and UFH types, floor types etc. These would normally be calculated at a standard 1- 2L/min but this should all be designed about the spaces requirement/heat loss calcs.