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help with flow rates in floor heating and pex design
livinglife
Member Posts: 2
Hello everyone.
So many great posts and responders.
Having read many of them, people say the building was piped wrong. MY WORST NIGHTMARE!
I am building a new house.
4 foot frost wall (nova scotia, Canada) the interior of the frost wall will have 2 inch XPS R10 foam from the top of the frost wall down 3 feet. slab on grade ( 4 inches of gravel,3 inches of XPS R15, 6 mil vapor barrier, then 4 inch slab. 1/2 inch pex tied to 6 inch grid mesh and held up with chairs to center of the slab.
Exterior walls are 2x6 (R20 fiberglass with 1 inch XPS on exterior of the sheathing to create a thermal break Total of R 25 in walls) R50 atticat blown in ceiling. The windows are all casement. Steel exterior doors with 1/2 glass in all the doors. I will be using an electric thermo 2000 Combomax boiler. (Domestic and radiant) 1/2 inch pex for radiant.
I will attach the drawing. Its all 1 floor. (Inlaw suite for my Dad)
If anyone would please help with the design it would be greatly appreciated. Any suggestions would also be appreciated with insulation. Nothing is built yet, so now is the time for changes.
Thank you
Have a great day!
So many great posts and responders.
Having read many of them, people say the building was piped wrong. MY WORST NIGHTMARE!
I am building a new house.
4 foot frost wall (nova scotia, Canada) the interior of the frost wall will have 2 inch XPS R10 foam from the top of the frost wall down 3 feet. slab on grade ( 4 inches of gravel,3 inches of XPS R15, 6 mil vapor barrier, then 4 inch slab. 1/2 inch pex tied to 6 inch grid mesh and held up with chairs to center of the slab.
Exterior walls are 2x6 (R20 fiberglass with 1 inch XPS on exterior of the sheathing to create a thermal break Total of R 25 in walls) R50 atticat blown in ceiling. The windows are all casement. Steel exterior doors with 1/2 glass in all the doors. I will be using an electric thermo 2000 Combomax boiler. (Domestic and radiant) 1/2 inch pex for radiant.
I will attach the drawing. Its all 1 floor. (Inlaw suite for my Dad)
If anyone would please help with the design it would be greatly appreciated. Any suggestions would also be appreciated with insulation. Nothing is built yet, so now is the time for changes.
Thank you
Have a great day!
0
Comments
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Thanks for the advise.
Im not sure. Thats why I asked for suggestions and help. As I mentioned, nothing is done, so at this point anything can be changed/added.0 -
You need to start with a room by room heat load
If you want to tackle that you can do a long hand form, or look into a software.
This is a program I use, try a free demo at
www.hydronicpros.com
A paper version in the Uponor CDAM manual
free download at the Uponor website
this manual takes you through all the steps, heatloss, sizing tube layout, piping, pump choice, etcBob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0 -
Generally a 1/2" loop under 300' flows 0.5-1.25GPM. 0.75 is a typical. How many loops you have is a layout question and that is influenced by how much heat the structure needs. So heat loss calculations are in order. It's way better to have it designed than guess and be wrong. 6" bend radius is the max. 6" tube spacing makes for good btu output but some of your spaces might over shoot if you do 6" tube spacing for all areas. Let a designer with a computer do it.0
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