low loss header mixed water temperatures by Mike Sammon

[@markrussell9719]

Interesting video. May I ask what book or course notes you were showing the diagrams from as I would like to obtain them for reading up on.

[@gavla666]

Yeah I wanted to ask the same

[@grantsimpson2]

@@gavla666 Not sure if you're still wondering but its from the idronics magazine series by Caleffi. They have all issues for free in pdf form. Pretty cheap to get past physical copies and free to get current issues if you subscribe

[@COUPEDUMMY]

Hi just come across your video. Was looking at a commercial system today with three secondary circuits with a LLH configuration the same as pictured. Heating ct , one small ct and small vt circuits. When the two smaller circuits are operational alone, the temperature drop between primary flow and secondary flow is only about 5 degrees. When the much bigger ct pump is switched on, the secondary temp dips hugely with about a 20 degree variance between primary flow and secondary… the concern with this is that the one ct circuit serves calorifiers that need to be stored at 60 degrees. We are getting about 45-50 degree delivery to the calorifiers at this point which is causing legionella concerns. So, ideally we need to be balancing pressures I assume. Bigger shut pumps on the primary?

[@ghostridergr8259]

it just a empty big pipe?

[@Whats-a-Tekker]

@AinsdaleGasHeatingPlumbing what boo are you looking at? cheers

[@RoobieRoo2]

yeah that's what I would like to know

[@COUPEDUMMY]

Hi just come across your video. Was looking at a commercial system today with three secondary circuits with a LLH configuration the same as pictured. Heating ct , one small ct and small vt circuits. When the two smaller circuits are operational alone, the temperature drop between primary flow and secondary flow is only about 5 degrees. When the much bigger ct pump is switched on, the secondary temp dips hugely with about a 20 degree variance between primary flow and secondary on the low loss header… the concern with this is that the one ct circuit serves calorifiers that need to be stored at 60 degrees. We are getting about 45-50 degree delivery to the calorifiers at this point which is causing legionella concerns. So, ideally we need to be balancing pressures I assume. Bigger shut pumps on the primary?

[@benzal86]

Havent time too see if this question has been put to you already.. but.. When explaining different scenarios of what could go wrong with LLH and the scenario you'd prefer with a low loss header (LLH) would be nice if you could elaborate on the reasons of such heating issues.. ie: flow returning to boiler via LLH without circulating around the system would suggest regulating values on return are closed too much etc