Vt circuits?

[greg27]

Hello everybody, was after some advice from the clever ones out there. Been reading some interseting threads about vt circuits , and i was hoping someone could help me undersrand how these work? Have tried to find books but no joy yet , i want to be a better plumber /heating engineer and have never been taught about these , mainly domestic plumber / heating but have been doing the job for just over ten years now. So far i think they are variable temperature circuits where you take heat from return water and divert it to other sources (i.e ufh) or am i total off ? Ermitrude u seem to have a clever mind any chance of a lesson from someone who knows? Ill take bk my ufh comments from last time

 

[Rickster123]

Ermitrude u seem to have a clever mind

I stopped reading at this point...:chinese:

 

[newcastle phill]

You wanna see his dog. It can change a flat tyre.

 

[Dotty]

VT circuits are used more on commercial installations in conjunction with a low loss header. In a nutshell the circuit return is piped through a three port valve with the diverted leg tee'd into the flow to give a modulated temperature.

That's a very basic explanation, there's more to them than that.

 

[greg27]

VT circuits are used more on commercial installations in conjunction with a low loss header. In a nutshell the circuit return is piped through a three port valve with the diverted leg tee'd into the flow to give a modulated temperature.

That's a very basic explanation, there's more to them than that.

Thank you anywhere i can get more info ?

 

[wetdrip]

Hello everybody, was after some advice from the clever ones out there. Been reading some interseting threads about vt circuits , and i was hoping someone could help me undersrand how these work? Have tried to find books but no joy yet , i want to be a better plumber /heating engineer and have never been taught about these , mainly domestic plumber / heating but have been doing the job for just over ten years now. So far i think they are variable temperature circuits where you take heat from return water and divert it to other sources (i.e ufh) or am i total off ? Ermitrude u seem to have a clever mind any chance of a lesson from someone who knows? Ill take bk my ufh comments from last time

F.F.S.
Ermi will be dining out on that one for years!

 

[Dotty]

Thank you anywhere i can get more info ?

Why are you looking to know?

 

[lame plumber]

its Saturday night, no girl friend needs something to do, perhaps???? 🙂

 

[Ermintrude]

VT circuits are used more on commercial installations in conjunction with a low loss header. In a nutshell the circuit return is piped through a three port valve with the diverted leg tee'd into the flow to give a modulated temperature.

That's a very basic explanation, there more to them than that.

Really? Croppies explanation was pretty much it. The rest is control. VT means variable temp. - the output is modulated to minimise overshoot and optimised to avoid undershoot. The output of a system is a parabola. You want to hit the set point at the position where a tangent would be steepest and this the most responsive system dT/dt most rapid temp change. Which means it responds quickly and precisely. Thus saving money (aim of the game)
If you have the approximate equation of the heating function (parabola) u can tune a controller PID to manage the system at optimum dT - macroscopic temperature change in dt - shortest period of time. But much for a house tho.

 

[greg27]

Why are you looking to know?

Well ive been off for five months with a slipped disc thru work, so am just bored with being able to do nothing , theres only so much tv u can watch, so i thought it might be a good idea to learn more things, thats all , lame plumber i actually have a wife and dont i bloody know it

 

[greg27]

Really? Croppies explanation was pretty much it. The rest is control. VT means variable temp. - the output is modulated to minimise overshoot and optimised to avoid undershoot. The output of a system is a parabola. You want to hit the set point at the position where a tangent would be steepest and this the most responsive system dT/dt most rapid temp change. Which means it responds quickly and precisely. Thus saving money (aim of the game)
If you have the approximate equation of the heating function (parabola) u can tune a controller PID to manage the system at optimum dT - macroscopic temperature change in dt - shortest period of time. But much for a house tho.

Ok maybe i dont need to know

 

[Dotty]

Lol, don't get disheartened Greg. You're not doing much anyway, build your post count up to 100 then apply for arms access.

We have a fair amount of craic in there.

It'll change your life forever. Ermi used to be a grumpy bugger for example.

 

[Atouchofgas]

It'll change your life forever. Ermi used to be a grumpy bugger for example.[/QUOTE]

What do you mean used to be! Still is

 

[Rickster123]

It'll change your life forever. Ermi used to be a grumpy bugger for example.

What do you mean used to be! Still is[/QUOTE]

Hes not grumpy, just misunderstood. A lot.

 

[newcastle phill]

If you saw the state of the back of his van youd be grumpy too.
Looks like a gypos robbed a scrapyard

 

[lame plumber]

Well ive been off for five months with a slipped disc thru work, so am just bored with being able to do nothing , theres only so much tv u can watch, so i thought it might be a good idea to learn more things, thats all , lame plumber i actually have a wife and dont i bloody know it

when I was off with 3 prolapsed discs all I did was breaking bad and any other boxed set I could find, beggar improving my knowledge 🙂

 

[greg27]

when I was off with 3 prolapsed discs all I did was breaking bad and any other boxed set I could find, beggar improving my knowledge 🙂

3 !! I was worried i wouldnt be able to go bk to it , still hope then for me

 

[lame plumber]

3 !! I was worried i wouldnt be able to go bk to it , still hope then for me

winging at one prolapse!!! grow some boy. then go buy a nice crane for lifting AGA solid fuel hot spots out, I dont lean over and pop them out by hand anymore, seems its bad for your back 🙂