The water that flows in the common pipe is it returned water from the primary loop or the secondary loop? I don't get when the water comes out of the second tee where does it go? does it get carried away with the primary water, or does it go back into the first tee? Is it the same water circulating inside the secondary loop? If so how does it get heated?
My question is regarding the scenario where you have 150 gpm in the secondary loop but 100 gpm in the primary loop with the reverse flow in the decoupler, how can that happen if the pressure in the primary loop is larger?
If the primary and secondary loops are decoupled and operate independently, why would the 100 gpm of water from the primary loop all of a sudden go into the secondary loop when there is a pump on the secondary loop since the pressure drop in the common pipe is still 0 ?
Thanks for the question. The pump in the secondary loop would create a drop in pressure. If the secondary pump creates enough pressure drop to flow 100 GPM thru the secondary loop then we have to have 100 GPM leaving the first T going into the secondary. Based on the T Law if we have 100 GPM going into the T then 100 GPM leaving the T going into the secondary that leaves 0 GPM flowing thru the common pipe. It all goes back to the secondary pump and the flow rate it establishes.
Interesting. So my single pipe central heating system (two tees off single pipe to each radiator) doesn’t work. I wonder what’s been causing the radiators to heat up for the last 60 years then?
Great question. If you have any pressure drop between the two tees then you can get flow into the radiator with a pump. Bell and Gossett makes monoflo tees for this type of application for single pipe systems. Info can be found at: bellgossett.com/hydronic-plumbing-accessories/flow-control-valves/copper-red-ring-monoflo-fittings/
I am so happy I found this. You have answered ALOT of my questions concerning the closely separated Tee system.
Awesome Tutorial. Thank you for this.
Thanks very much for this wonderful down to earth explanation. You just made my life a bit easier.
Legend. That's made it so simple to understand, thank you.
Thanks for sharing - This is a really good explanation.
Excellent explanation. Thanks
The water that flows in the common pipe is it returned water from the primary loop or the secondary loop? I don't get when the water comes out of the second tee where does it go? does it get carried away with the primary water, or does it go back into the first tee? Is it the same water circulating inside the secondary loop? If so how does it get heated?
Too many videos out there geared towards engineers. I like how simple yet effective it is. Thanks
very sincere thanks to your effort rom india ,,, a great help
Great video.I had 2 tech's try and explain this to me but this sunk in.
Awesome video thank you very much ❤️‼️🇬🇧
If incase the supply and return piping are at different levels and we connect the decoupler with some angle fitting will it work or cause problems.
Thanks for this video .
Thank you!
My question is regarding the scenario where you have 150 gpm in the secondary loop but 100 gpm in the primary loop with the reverse flow in the decoupler, how can that happen if the pressure in the primary loop is larger?
Easy to understand from other videos
If the primary and secondary loops are decoupled and operate independently, why would the 100 gpm of water from the primary loop all of a sudden go into the secondary loop when there is a pump on the secondary loop since the pressure drop in the common pipe is still 0 ?
Thanks for the question. The pump in the secondary loop would create a drop in pressure. If the secondary pump creates enough pressure drop to flow 100 GPM thru the secondary loop then we have to have 100 GPM leaving the first T going into the secondary. Based on the T Law if we have 100 GPM going into the T then 100 GPM leaving the T going into the secondary that leaves 0 GPM flowing thru the common pipe. It all goes back to the secondary pump and the flow rate it establishes.
Interesting. So my single pipe central heating system (two tees off single pipe to each radiator) doesn’t work. I wonder what’s been causing the radiators to heat up for the last 60 years then?
Great question. If you have any pressure drop between the two tees then you can get flow into the radiator with a pump. Bell and Gossett makes monoflo tees for this type of application for single pipe systems. Info can be found at: bellgossett.com/hydronic-plumbing-accessories/flow-control-valves/copper-red-ring-monoflo-fittings/