ASHP glycol smell

[Andy]

Although it was my ground source loop, they used food grade glycol for that reason. Don't want poison going into the ground water.

I'm running my radiator pipes without any chemicals at all. VDI2035 standard. Glycol reduces the heat carrying capacity of the pipes. I'm not having to bleed air off the towel radiator any more and the tests seem to be coming back nicely for conductivity when I last ran them. If I have a power cut I have a plan to run the NIBE at roughly 5º temperature which will stop the pipes freezing. This will use very little power from the battery. If it all goes Pete Tong long term then I will drain everything.

[Stinsy]

Anti-freeze valves are nowadays considered a better way of dealing with a power cut than glycol.

[ivan]

" I'm not having to bleed air off the towel radiator any more...."

Does the glycol create gas in the system? I have to bleed air out of the towel rail on the top floor on an almost weekly basis, but no idea why - maybe glycol-related?

I'd definitely opt for an easier method to protect my ASHP instead of glycol if it's possible!

[Countrypaul]

" I'm not having to bleed air off the towel radiator any more...."

Does the glycol create gas in the system? I have to bleed air out of the towel rail on the top floor on an almost weekly basis, but no idea why - maybe glycol-related?

I'd definitely opt for an easier method to protect my ASHP instead of glycol if it's possible!

The most likely cause of gas in the system will be rusting of any steel components resulting in hydrgen being produced.Glycol is considered non corrosive but flycol/water mix will cause rust just las water does.

[AE-NMidlands]

" I'm not having to bleed air off the towel radiator any more...." "on an almost weekly basi"

Air - or gas? Weekly bleeds say to me that either the system is repeatedly getting topped up with mains water (bringing with it dissolved air/gases) or there is corrosion happening somewhere, probably generating hydrogen.

I would try to either put a flame to the vented gas - or collect it (not mixed with air) and then do the same outsde!
A

[Countrypaul]

" I'm not having to bleed air off the towel radiator any more...." "on an almost weekly basi"

Air - or gas? Weekly bleeds say to me that either the system is repeatedly getting topped up with mains water (bringing with it dissolved air/gases) or there is corrosion happening somewhere, probably generating hydrogen.

I would try to either put a flame to the vented gas - or collect it (not mixed with air) and then do the same outsde!
A

If it is hydrogen and you put a flame to bear in mind that it will burn blue/colourless so very difficult to see unles it is dark.

[Stinsy]

" I'm not having to bleed air off the towel radiator any more...." "on an almost weekly basi"

Air - or gas? Weekly bleeds say to me that either the system is repeatedly getting topped up with mains water (bringing with it dissolved air/gases) or there is corrosion happening somewhere, probably generating hydrogen.

I would try to either put a flame to the vented gas - or collect it (not mixed with air) and then do the same outsde!
A

Air in the system is frequently caused by an expansion vessel issue. Either it isn’t pumped up or the membrane has perished. When the fluid warms up it expands and pushes a trickle out of the PRV, when it cools again it shrinks and pulls some air in through the PRV.

[Andy]

Anti-freeze valves are nowadays considered a better way of dealing with a power cut than glycol.

Interesting, unfortunately I don't have anywhere I can put it at the low point in my circuit :<

[Stinsy]

Anti-freeze valves are nowadays considered a better way of dealing with a power cut than glycol.

Interesting, unfortunately I don't have anywhere I can put it at the low point in my circuit :<

Next to the HP is the standard location. The logic is that glycol reduces efficiency, powercuts are pretty rare, and it takes a long power cut coinciding with subzero conditions to cause a problem anyway. Don’t forget that it is the HP itself you’re protecting…

[AGT]

https://www.bes.co.uk/amfile/file/downl ... uct/56988/