UFH - Supply and Return pipes...

[JohnMo]

Trouble is they are just making pretty pictures.  There is zero balancing of room output.  All designed around a thermostat controlling the room temperature.

[Nickfromwales]

4 hours ago, JohnMo said:

Trouble is they are just making pretty pictures.  There is zero balancing of room output.  All designed around a thermostat controlling the room temperature.

Plus, it’s just dogshit (pretty pictures). 

[Mulberry View]

12 hours ago, JohnMo said:

Trouble is they are just making pretty pictures.  There is zero balancing of room output.  All designed around a thermostat controlling the room temperature.

 

Awesome!

 

Anyone up for productively helping out with this for some beer tokens?! 🤣🍺

 

This guy is primarily a screeder by the way (and one that came highly recommended by someone I really trust), so I'm not holding it against him too much. I also think he'll be a good supplier for the kit, perhaps just not so much the design!

[Nickfromwales]

12 hours ago, JohnMo said:

Trouble is they are just making pretty pictures.  There is zero balancing of room output.  All designed around a thermostat controlling the room temperature.

It’ll be running such low temps that it won’t matter imho. Balancing on the manifold is fine to get flow rates fettled in, and after that it should be plenty good enough. 
 

I’ve never done loops by room, and I only make overall adjustments for changes like this (200mm cc or 150mm cc or 100mm cc) for different types of heat sources.
 

The only time I change loops per room (or space) is for adding tighter loops in bathrooms, or for hallways where the area is open to the 1st floor etc and needs a little more ‘oomph’.

[Nickfromwales]

1 hour ago, Mulberry View said:

Anyone up for productively helping out with this for some beer tokens?! 🤣🍺

Send me a PM if you’re stuck. It really doesn't need to be this hard .

[JohnMo]

Computer models just use some basic science.

 

This chart and room by room heat loss calculation is about all you need. You then vary spacing to suit your needs.  Start in living room with say 200mm to 300mm spacing and then move the spacings around to W/m2 based on heat loss and target room temperature. Your flow temp max shouldn't be above 30 degs.

 

Key to this knowing room heat loss. @SimonD has a tool in boffins corner I think.

 

As @Nickfromwales says loops don't need to be by room. One of mine partly heats hall, bathroom and kitchen.