Could oxygen level in hydronic heating system be too low?
Could oxygen level in hydronic heating system be too low?
(OP)
A question has been raised in a Canadian pulp mill. Could the O2 level be too low causing the system to airlock and reduce heat transfer efficiency. We all know about diffusion but what is the limit?





RE: Could oxygen level in hydronic heating system be too low?
RE: Could oxygen level in hydronic heating system be too low?
RE: Could oxygen level in hydronic heating system be too low?
Normally, in my world of Building Hydronic systems, after the initial fill with clean water, it's treated with inhibitors and other chemical treatment to remove minerals, scale, sludge, etc. AND some kind of permamanent air extractor (Airtrol) is used to remove all the air from the system. If an anti-freeze mixture is required, then inhibited glycol of various types (as required for the application) is mixed in to the system. Some other systems such as geo-exchange systems, that may run at low temperatures, sometimes use a methanol solution for anti-freeze to keep the viscosity in control.
RE: Could oxygen level in hydronic heating system be too low?
In your opinion there is nothing good that could ever come from infusing the water in a hydronic heating system with Oxygen. At any level for any reason.
RE: Could oxygen level in hydronic heating system be too low?
RE: Could oxygen level in hydronic heating system be too low?
SO...Bleed air, fill with liquid, repeat until ALL of the air is out of a system. Keep in mind that a lot of air bleeders installed at the high point WILL let air IN to the system if it is not 100% full. Shoot for about 10 psi at the high point. Sometimes, perhaps on a shutdown or something similar, it seems that air will find it's way to the high point, rather than being entrained "midstream"...so my point is, it may be helpful to shut a system off and wait for air to bleed out.
I apologize for the lenghty reply, I am sure there is a thread on this topic somewhere else...
RE: Could oxygen level in hydronic heating system be too low?
RE: Could oxygen level in hydronic heating system be too low?
RE: Could oxygen level in hydronic heating system be too low?
RE: Could oxygen level in hydronic heating system be too low?
RE: Could oxygen level in hydronic heating system be too low?
RE: Could oxygen level in hydronic heating system be too low?
"PEX Tubing is used to distribute water in PEX Plumbing, Radiant Heat, and other Hydronic Heating Systems. When using PEX Tubing for heating purposes, Oxygen Barrier PEX such as ThermaPEX, Wirsbo hePEX, Mr. PEX-al-PEX, and Multicor PEX-al-PEX Tubing should be used."
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FYI, Oxygen Barrier means keeping oxygen out of the system.