Low Loss Header

[breezer]

I have a better use for it

Sorry i couldnt help it

 

[Sider]

Onetap wrote

carp design

What does "carp" design mean ??

 

[Sider]

AAh I think you meant "crap" design Onetap.

I think its a waste of good steel.

 

[Softus]

What does "carp" design mean ??

 

[Softus]

http://img.photobucket.com/albums/v395/thescruff/Imgp1309m.jpg

Just curious - how many people's work are you taking credit for here?

 

[Onetap]

What type of insulation is that on the pipes in the second photograph.?

Isogenopak cladding.
http://www.kpfilms.com/en/products/...and Asia -- Isogenopak Brochure (English).pdf

It'll cost yer.

 

[Sider]

Onetap.
Do you think that header design in the first photograph published by Doital could have been acheived using much less steel piping ??.

 

[doitall]

http://img.photobucket.com/albums/v395/thescruff/Imgp1309m.jpg

Just curious - how many people's work are you taking credit for here?

Got my name on the end Softus.

 

[Softus]

Hm. Still unclear - are you saying that you were the only person who worked on it?

 

[doitall]

Onetap.
Do you think that header design in the first photograph published by Doital could have been acheived using much less steel piping ??.

Read my post sider, the horizontal header was for convenience as fixing was poor to say the least.

You should also understand the size of the system.

4 x 20Kw blowers
8 x average radiators.
3000m ish underfloor heating.
plus provisions for phase 2 in the new year.

 

[Onetap]

Onetap.
Do you think that header design in the first photograph published by Doital could have been acheived using much less steel piping ??.

I've no idea, I have no details.

I'd imagine the cost of the pipe and fittings would be a small part of the total cost, so I don't see problem with the pipe size. Better too big than too small.

 

[Softus]

You should also understand the size of the system.

I imagine that a system of this size would require more than one person to install it, although taking all the credit for it is easily a one-man job.

 

[doitall]

Hm. Still unclear - are you saying that you were the only person who worked on it?

No, I had an improver working with me.

Not done pipe fitting before. Dam good welder though.

 

[Sider]

Onetap wrote

I

will only refer you to CIBSE Guide H, section 5.4.3 and figure 5.23. The differences are subtle, but critical. If you realised how bad that was, you wouldn't have posted it.

Then Onetap wrote

I've no idea, I have no details

after my question about the amount of steel used.

If this reference to the CIBSE guide shows a more superior method of designing the system , then you surely must know if less steel could have been used thus making the installation cheaper .
You have seen the photograph and seen fit to call it a "carp" design so in your professional opinion would you not agree that too much steel has been used.??.

 

[Onetap]

Then Onetap wrote

I've no idea, I have no details

after my question about the amount of steel used.

If this reference to the CIBSE guide shows a more superior method of designing the system , then you surely must know if less steel could have been used thus making the installation cheaper .
You have seen the photograph and seen fit to call it a "carp" design so in your professional opinion would you not agree that too much steel has been used.??.

It gives the fundamentals, you'd have to fill in the details from elsewhere.

Having got it out, they call that arrangement a 'decoupler', a variation on the low loss header, which they recommend for multiple boilers and so variable primary flow rate. It is described as an upright pipe or a buffer vessel, so the size of the pipe is not an issue. You might be able to make it smaller, but I really wouldn't bother.

The last one I designed was 8" pipe and 3,500 kW boiler load, but that is a long time back. I didn't install it.

The issues are;
i) the sequence of the primary/secondary connections and;
ii) preventing mixing in the header.

If the secondary flow> the primary flow, then you get reverse flow and mixing in the decoupler pipe. This can happen at part load, e.g., one boiler running.