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Forum: Renovations & New Construction 02-02-18, 01:42 PM
Replies: 13
Views: 11,035
Posted By buffalobillpatrick
For 1/2” Pex-A Max recommended loop length...

For 1/2” Pex-A

Max recommended loop length is usualy 300’

I recommend making loops shorter to reduce pumping energy.

1 GPM through 300’ needs 5.1 PSI

Cut loop length in half to 2 x 150’
Forum: Renovations & New Construction 01-11-18, 11:16 AM
Replies: 13
Views: 11,035
Posted By buffalobillpatrick
Dend, your: “It's true regardless. A 50% duty...

Dend, your:
“It's true regardless. A 50% duty cycle at design conditions is Short Cycling.”

U R confusing a boiler that is oversized for the home heating load at “design” temperature
(2*F)...
Forum: Renovations & New Construction 03-28-17, 09:49 AM
Replies: 13
Views: 11,035
Posted By buffalobillpatrick
DEnd What you are saying is true, "IF" the...

DEnd

What you are saying is true, "IF" the boiler turned on whenever a thermostat called for heat. Sadly this is how many systems are implemented.

My boiler will NOT short cycle, as there is a...
Forum: Renovations & New Construction 03-27-17, 06:19 PM
Replies: 13
Views: 11,035
Posted By buffalobillpatrick
The Uponor design guide shows running the supply...

The Uponor design guide shows running the supply (hotter) along the exterior walls 1st before moving toward center of room (heat loss is less).

Placing the tubes closer together has the same...
Forum: Renovations & New Construction 03-23-17, 04:14 PM
Replies: 13
Views: 11,035
Posted By buffalobillpatrick
My windows & doors U=.25 = R-4 My walls 6"...

My windows & doors U=.25 = R-4

My walls 6" Polyiso foam is R-2 / inch @ 0*F and R-6 / inch @ 70*F
My wall average @ 0*F outside is about R-4 / inch = R-24

So my windows & doors loose heat...
Forum: Renovations & New Construction 03-17-17, 03:02 PM
Replies: 13
Views: 11,035
Posted By buffalobillpatrick
Reducing flow to only 25% or from 1 GPM to .25...

Reducing flow to only 25% or from 1 GPM to .25 GPM reduces heating to 75%

See figure 2

A New Approach to Variable Flow Hydronic Systems...
Forum: Renovations & New Construction 03-12-17, 04:11 PM
Replies: 13
Views: 11,035
Posted By buffalobillpatrick
On balancing heating of the loops concept: ...

On balancing heating of the loops concept:

After the emitters are installed, you can wait for cold weather & use an IR gun on each loop, then choke off the hotter returns. This is a waste of...
Forum: Renovations & New Construction 03-12-17, 03:35 PM
Replies: 13
Views: 11,035
Posted By buffalobillpatrick
http://www.uponorpro.com/calculator/ For...

http://www.uponorpro.com/calculator/

For 1/2" pex at 100*F

1 GPM through 200' = 8.022 feet of Head loss = 3.45 PSI

So the pump is pressurizing the supply manifold 3.45 PSI greater than the...
Forum: Renovations & New Construction 03-11-17, 04:32 PM
Replies: 13
Views: 11,035
Posted By buffalobillpatrick
Pex loop length & spacing?

I have always read & believed that pex loops off of a manifold should be +- 10% of each other & important for balanced heating of the loops.

It seems that this is not very important.
...
Showing results 1 to 9 of 9

 
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