Running condensing boilers in condensing mode

[simond]

I've just had a phone call from the tech manager of Ravenheat

I seem to remember you writing some nice things about them

who confirmed that I was absolutely spot on with the way I had designed our sytem around their boiler with a cool heating circuit and hot cylinder circuit.

Amazing, what an insight! It's as if weather compensation had never been invented. All the time a guest house owner and sometime kitchen fitter had the answer we had all missed while sitting in our boxes.

Perhaps you'd appreciate some 'out of the box' advice from us on how to design a petrochemical plant?

 

[Deleted member 105431]

Ravenheap advice is worth about as much as that from Tata or Lada.

 

[Tipper]

Ravenheap advice is worth about as much as that from Tata or Lada.

Tata alias Jaguar-LandRover you mean?

 

[Deleted member 105431]

Ravenheap advice is worth about as much as that from Tata or Lada.

Tata alias Jaguar-LandRover you mean?

Have you seen the tata "own brand" vehicles? I'd rather walk.

 

[D_Hailsham]

Ravenheap advice is worth about as much as that from Tata or Lada.

Do you mean Tatra, a Czech car maker which ceased production in 1999?

 

[Deleted member 105431]

Ravenheap advice is worth about as much as that from Tata or Lada.

Do you mean Tatra, a Czech car maker which ceased production in 1999?

No, I mean Tata the Indian car manufacturer.

 

[D_Hailsham]

No, I mean Tata the Indian car manufacturer.

OK. Tata Motors is just part of the global Tata empire. Jaguar/Landrover is another branch of the empire.

 

[Deleted member 105431]

http://www.compucars.co.uk/presspics/281.jpg

 

[Agile]

Some of you may remember the Empire days and British Steel, which then became Corrus which was in turn bought up by Tata !

Tony

 

[bengasman]

The condensing process does not start or stop at 55 C, above this temperature it gets rapidly less.

Where do you get this idea from?

Experience

 

[bengasman]

it takes a hell of a lot of energy to turn water into steam

But where is the water in a boiler?
I was led to believe carbon and hydrogen when burnt in a combustion chamber and combined with oxygen , will produce water vapour which then becomes superheated.

It neither is, nor becomes superheated.

 

[Norcon]

it takes a hell of a lot of energy to turn water into steam

But where is the water in a boiler?
I was led to believe carbon and hydrogen when burnt in a combustion chamber and combined with oxygen , will produce water vapour which then becomes superheated.

It neither is, nor becomes superheated.

Why not?

 

[bengasman]

Because nothing caused it to become superheated

 

[Agile]

The white plume from a boiler or an electric kettle is not actually "steam" !

Its tiny droplets of water!

Superheated steam is steam ( which is colourless by the way ) which is at a higher temperature than required to vapourise the water. e.g. 103° C for example.

Condensing boilers try to achieve a flue exit temperature of about 50 ° C if possible at maximum efficiency but most of the time its between 50-70 ° C.

White flue gases represent water droplets which have not been caught by the condensate drain.

Tony

 

[Norcon]

Because nothing caused it to become superheated

So why do eco hometec state the following ........?

For every 1kg of hydrogen burned, 9kg of water vapour is produced. The temperature in the heat exchanger of a boiler can reach 1400°C. The water vapour produced is so hot it turns into superheated steam. This superheated steam contains both sensible (available heat) and latent heat (heat locked up in the flue gases). A conventional boiler will recover some of the sensible heat by passing these hot gases over a heat exchanger. The heat exchanger in non condensing boilers is generally made of cast iron or steel and cools the gases to between 250°C and 350°C.