Quote:
Originally Posted by Ormston
Had never considdered radiant walls before might just have to try it(as well as floor) in our loft conversion.
We have pipework at 100mm spacing in the ground floor screed, but could only do 200mm spacing on the first floor due to that being the the standard spacing for Myson aluminium heat spreaders.
This has given us the issue of a warm ground floor and not quite warm enough first floor when running very low flow temps (Max 28C).
If I use radiant walls as well as floors in the loft this might just give out enough heat at such low flow temps(ASHP cannot manage any more) and with the space above the first floor heated, that will hopefully reach temp too.
Steve
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You have some really interesting information here, especially for EcoRenovators in the US.
As a basis for understanding, your heat loss is obviously very low. It would be useful to know a bout that.
I would like to make sure that people in the US understand what you are doing.
You have a hydronically heated cement slab on the 1st floor with PEX spaced at
4 inch intervals.
You are also hydronically heating your 2nd floor with
PEX spaced at 8 inch intervals. You would like to have the spacings closer, but your aluminum heat spreader(s) will not allow spacing PEX closer than 8 inches.
Your water feed temp to both floors is running at a
maximum of 82 degrees F.
As a result of your 2nd floor PEX tubes being spaced at 8 inches, even though you have aluminum spreaders, your above-the-subfloor construction is running less efficiently than the 1st floor.
Ormston, did I get all of that right?
The most remarkable part of your post is that you are successfully heating with a feed temp of only 82 degrees. It would be very useful to know what your indoor air temperature is.
Some other of the things I see that is remarkable is the 4 inch spacing in your slab. I'd be very interested in knowing the thickness of the slab, and what kind of insulation you have under that slab, and what diameter PEX are you using?
I'd also like to know how that slab was laid out to allow you to get 4 inch spacings. I have an inkling how you did it, but I'd like to hear it from you.
Another thing I think is remarkable is that an 8 inch spacing, even with aluminum spreader plates, will not supply heat as well as the slab.
It is a bit like comparing oranges to apples, because of the differences (cement vs built-up with aluminum, PEX spacing, etc.).
What do you think made the difference?
Best,
-AC