Recent content by kikonas68

Hello. I set up demand patterns and I run a 24h simulation so each time only one node has actually a flow demand, works fine. The thing is it would be nice each time I change the time period to see on screen the pressure only for the node/s that have a non-zero at that time (not the rest of the...

Thanks. That's the basic idea I was looking for.

Thanks a lot for sharing and your time spent Much appreciated you sharing all this and the time spent.

Hello. I have drawn the network with all its nodes(with their respective base demands) and its reservoir. Is there a way to run the simulation several times so that each time only specific nodes are "open"(having the base demand already assigned) and for the rest of the nodes base demand is...

Thanks for the answer. Ok, I see the mix up. This is for myself.

Hi. I have looked into many P&IDs, list of symbols etc. Haven't found what I was thinking of (maybe wrong, trivial, too basic, who knows [shadeshappy] ), besides I'm a little confused about some things. Well here it is the, kind of, P&ID of DHW production(please notice that I omitted many...

Absurd, cannot happen.

Maybe the solution could be just a three way mixing valve electronically controled(such as those used for adjusting at will the distribution temperature of DHW) maintaining 50οC at the outlet? This way heat pump always sees the same flow rate and same ΔΤ.

Thanks for both answers. Will look into it, I'm seeing a lot of new questions on the way[shadeshappy] It's a geothermal heat pump (evaporator exchanges with vertical closed loop). The thing is that constant flow rate at the primary has been put as a non-negotiable prerequisite. Regarding...

Hello. We say that heat pumps function with a ΔΤ of 5°. Let's say we want to heat fresh water entering our storage tank at 15°C (as it comes from the water main) to 54°C at a flow rate of 0,8m³/h (our secondary circuit). The primary circuit should have a ΔΤ of 5°. Roughly, by energy balance we...

Thank you. Right (it is also stated in "HYDRONIC HEATING AND COOLING" (ASHRAE Handbook Systems and Equipment)).

About Caleffi both editions in question(no3 and no6 of idronics series) are dated back to 2008-2009. Maybe things have been reconsidered since then? In addition the current link for the data sheet of solar expansion vessels (including sizing)...

Regarding solar known manufacturers like Reflex, Caleffi etc. say in solar should be inversely. I/m still trying to find out why [bigsmile] though. Maybe something else than pump cavitation prevails (e.g. minimise pressure into the collectors which on the other hand favors evaporation combined...

i.e. I mess up the stratification. You're right! Thanks.

I meant that in solar loop the expansion tank is located at the circulator discharge.