How many square feet of CI radiation can pex handle

Mike T., Swampeast MO

Unless I know:

1) The size of the CI radiation (in EDR)

2) The heat loss [requirement] assocated with such radiation.

3) The expected average temperature of such radiation.

Henry Patterson Karis HVAC

How many square feet of CI radiation can each of these sizes

handle based on the chart I have from an earlier question:

3/8 Pex= 5/16" .3125" 1.6 gpm

1/2 Pex= 7/16" .4375" 2.3 gpm

5/8 Pex= 9/16" .5625" 3 gpm

3/4 Pex= 11/16" .6875" 3.67gpm

Henry Patterson Karis HVAC

Same question, different approach

How many BTU/h can I pump through the different sizes of PEX? So I know how much radiation I can stick on the end of the run of PEX. I don't need exact, just something close. I don't think PEX will push the same amount as copper, but I may be wrong.

[Deleted User]

You could push MORE thru pex than copper...

It's SMOOTHER!

Delivered btu's on the other end depends upon your desinged delta T.

Think wide delta T with cast iron radiators.

Like 30 to 40 degrees F.

gallons X pounds X delta T X time = btuH

So, 2.3 X 8.33 X 40 X 60 = 45,981 btuH

If each square foot of radiation deilvers 180 btu/sq ft /hr, then your 1/2" pipe at 2.3 GPM and a 40 degree delta T would carry approximatley 255 square feet.



ME