Why does a condensing boiler create a plume

[bernardgreen]

self obsessed,

You sign as "" Sir Richard Puller Master Plumber aka Richardthethird, DeltaT, DPuller, Dickie ""

I doubt you have ever been awarded a Knighthood. Did you get the "Sir" as a Christian name from your parents or did you add it by Deed Poll ?

Or is it to give your weak ego a boost. Maybe you have a problem with your own self esteem.

 

[bernardgreen]

& indeed moved his own gas meter.

NO I DID NOT,. I arranged for it to be moved by National Grid. You have been told that at least once before. You seem to have problem with your memory

 

[bernardgreen]

Aye right!!! You did it yourself

Yawn

 

[bernardgreen]

This link just arrived in an e-mail

http://community.screwfix.com/threa...led-puller-plumbing-international-inc.122401/

 

[bernardgreen]

You will not believe this but that link came from another member of DIYnot with e-mail. But yes I have googled "Sir Richard Puller" as you mentioned it.

Sorry to deflate your ego but I am not stalking you.

You consider your self a celeb ? Your name sake a few hundred years ago was.

 

[Steelmasons]

Steam is invisible, water vapour (condensed steam) is not.

http://www.weatherquestions.com/What_is_water_vapor.htm

Water vapor is water in its gaseous state-instead of liquid or solid (ice). Water vapor is totally invisible. If you see a cloud, fog, or mist, these are all liquid water, not water vapor.

The plumes on my boiler and my neighbour's boiler become visible an inch or so from the terminal. This suggests that invisible water vapour is condensing into water droplets at it meets cooler air.

If the concentric flue was made of heat conducting metal instead of plastic then possibly some of the heat in the flue gases could be transfered to warm the incoming air. The water vapour could also condense on the metal transfering the latent heat of condensation into the incoming air.

With a conventional boiler ( non condensing ) the temperature of the flue gases and the water vapour is high and the vapour travels further away from the terminal before it has been cooled enough to form water droplets. The droplets form and are dispersed over a large area and thus do not appear as mist or steam or a plume.

A condensing boiler produces a steam from it's flue. Call it steam in the marketing literature and people will think "wasted heat" but call it a plume and the obvious connection with wasted heat is no longer there.

Many boilers (C13/33) use stainless steel for flues/chimney...see many chimney/flues (B23) constructed of stainless steel.....only a certain grade of stainless should be used , I wonder if Bernard could enlighten us as to the correct grade of stainless ???
Some commercial burners utilise the POC's in order to recirculate into air intake..

 

[Dan Robinson]

Some commercial burners utilise the POC's in order to recirculate into air intake..

Some domestics too .

 

[Dan Robinson]

One I'm thinking of has a strategically placed whole on the inner.... also handy for putting a screwdriver in when a certain part needs changing .

Can't think of a domestic with a NOX tube, but I'm sure there is.

 

[bernardgreen]

wonder if Bernard could enlighten us as to the correct grade of stainless

For food processing it was generally 316 with 303 ( or was it 304 ) used for pipework not directly in contact with food and electrical cabinets.

I would guess 303 would have adequate corrosion resistance for flue pipe, maybe a tri-layer wall ( SS - aluminium - SS ) to achieve mechanical strength with the thinnest possible SS ( SS is not a good conductor of heat ).

Or has my memory failed.

 

[simond]

ne I'm thinking of has a strategically placed whole on the inner.... also handy for putting a screwdriver in when a certain part needs changing

Classic???

 

[Steelmasons]

Potty Netaheat..

 

[Dan Robinson]

That was a hole in the hood wasn't it?

 

[Steelmasons]

That was a hole in the hood wasn't it?

Certainly was..

 

[Steelmasons]

ne I'm thinking of has a strategically placed whole on the inner.... also handy for putting a screwdriver in when a certain part needs changing

Classic???

What hole are you referring too?

 

[shambolic]

Some commercial burners utilise the POC's in order to recirculate into air intake..

Some domestics too .

We do hence the Wee hole in the classic inner flue.