It is currently 28 Mar 2024, 22:30
9fingers wrote:For whatever reason this smacks of inadequate flow rate.
This could be any of:-
too high flow rate through another part of the circuit
inadequate pump flow
airlock
blocked pipes
11 degree drop along a pipe is too low flow rate giving time to lose heat. If the flow rate were near infinite, then there would be no loss.
Bob
9fingers wrote:The only places for significant temp drop is across the boiler,cylinder and rads.
Anywhere else is loss/waste.
Bob
RogerS wrote:9fingers wrote:The only places for significant temp drop is across the boiler,cylinder and rads.
Anywhere else is loss/waste.
Bob
I agree but my concern is that there is more heat loss with the new layout than the old by virtue of the way it's been fed? Am I right ?
9fingers wrote:RogerS wrote:9fingers wrote:The only places for significant temp drop is across the boiler,cylinder and rads.
Anywhere else is loss/waste.
Bob
I agree but my concern is that there is more heat loss with the new layout than the old by virtue of the way it's been fed? Am I right ?
Quite possibly but it is exposing the weakness in the flow rate for whatever reason.
Bob
9fingers wrote:9fingers wrote:RogerS wrote:
I agree but my concern is that there is more heat loss with the new layout than the old by virtue of the way it's been fed? Am I right ?
Quite possibly but it is exposing the weakness in the flow rate for whatever reason.
Bob
If the pipe run is the same length as before and the flow rate the same then the temp loss across all the pipes should be the same but with a different distribution. But there should be minimal temp loss across the pipework by design.
Andyp wrote:Stupid question perhaps. How is all the air getting into the system being as you bled the system just a week or so back? and IIRC only one rad was a cause for concern.
RogerS wrote:Who's the Daddy. Hosepipe out...bled again...now working. Let's be clear about this...bled as in not the wimp bleed from the standard bleed vale but yer full-on bleed using a hose pipe directly connected to where the bleed valve used to be.
9fingers wrote:When I did my solar thermal installers course, one of the tips the lecturer gave us was to install a deliberate "dead leg". This is a vertical pipe installed off the circuit with a bleed valve at the top. Air progressively collects in the dead leg harmlessly and every now and then it can be let out as part of routine maintenance.
9fingers wrote:I also understand why you don't want a standard pressurised system but having it pressurised to slightly more than the head provided by the top to bottom height should help with bleeding.
The circuit becomes mains water, non return valve, pressure reducing valve, expansion chamber and then onto the current circuit (anywhere convenient) with the header tank and overflow replaced with a pressure relief valve with its output connected to the overflow pipe to the outside world.
Bob
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