mgleeson
(Michael Gleeson, 16000070526)
July 27, 2019, 1:39pm
1
I have a boiler, I have inspected tons of boilers. All that I have seen have dedicated sections for supply and return. Until yesterday.
Here is what I am used to seeing:
Here is how yesterdays system was built:
Note that the supply and return land in the same section of the primary loop.
Any opinions on this?
mgoldenberg
(Marc Goldenberg, Inspector # HI1365)
July 27, 2019, 1:58pm
2
I’ll be watching for an education.
Thank God I’m in Florida & don’t see this kind of stuff.
jjonas
(Jeffrey Jonas)
July 27, 2019, 2:20pm
3
The One Pipe Series Loop uses less pipe than any other hydronic piping arrangement. Therefore it is less expensive to install the piping. However, you need bigger radiators or longer baseboards. However, only at the end of the loop because this part of the loop will have less heat. The radiators or baseboards at the beginning of the loop use most of the heat. Consequently, this is the reason for the larger radiators and baseboards at the end of the loop. There is also a larger temperature drop in this type of loop. A temperature drop between the supply and the return versus other types of hydronic piping arrangements. The near boiler piping may need to be modified to prevent large delta T between supply and return.
https://highperformancehvac.com/boiler-water-loops/
srechkin
(Simon Rechkin)
July 27, 2019, 2:26pm
4
You’re looking at a primary/secondary loop piping arrangement which is a better method when multiple zones call for heat at the same time.
mlarson
(Michael Larson, WI Lic. # 1672-106)
July 27, 2019, 2:51pm
5
Not really seeing a problem here.
dandersen
(David Andersen, TN HI# 40)
July 28, 2019, 2:11pm
6
In pic #1 you have valve actuators for each zone with one circulation pump. In pic #2 you have a pump on each zone.
Depending on the size of the zone determines the method that works best.
As for supply/return on the same loop, I stick two 15ga needles in the same artery of my arm to pull out and return blood for my dialysis machine. Works fine, same principal.