Wood burning stove with back boiler

[Mull]

The constant cold spot is inside your woodburner where the boiler is and the stove becomes inefficient at being a room heater, the dunsley neutraliser and injector tee is like you said 35 year old technology, poor water pressure and unbalanced hot and colds, I'm my opinion as a plumbing and heating engineer

 

 

Our stove produces the opposite effect, the room the stove is in gets too hot, to the point that I fitted an extractor on a roomstat to try and shift heat through to living room.

[Pooh sticks]

You see because your woodburner output has to be so great to heat the water when cold once the hot water is satisfied then the woodburner is way over kill to heat the room, you can get an air circulation unit now which apparently are really good just a massive extractor fan to pump it throughout the house

[Mull]

You see because your woodburner output has to be so great to heat the water when cold once the hot water is satisfied then the woodburner is way over kill to heat the room, you can get an air circulation unit now which apparently are really good just a massive extractor fan to pump it throughout the house

 

 

You're probably right.

 

But I still think it's the mutts nuts!!

[slim reaper]

Could someone please explain what the cold spot is and its effect?

thanks

 

slim

[Rkd]

But surely if you have the log burning aga firing all day (free logs of course) doing the cooking and hot water (I'm thinking a cylinder with desperate coil for hot water) your quids in!!!

 

My folks have solar thermal as well as LPG boiler but the panels are expensive, I've seen a cheap aga so it wud be the cost of the cylinder and pope work!!

 

 

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[slim reaper]

But surely if you have the log burning aga firing all day (free logs of course) doing the cooking and hot water (I'm thinking a cylinder with desperate coil for hot water) your quids in!!!

 

My folks have solar thermal as well as LPG boiler but the panels are expensive, I've seen a cheap aga so it wud be the cost of the cylinder and pope work!!

 

 

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Is the cooker an Aga or Aga style and do you know how many Btu's are given out to the water?

slim

[Rkd]

No mate I haven't been to see it yet and the seller didn't knw a great deal about it I'll post sum pics when I go to view!!

 

 

 

 

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[slim reaper]

No mate I haven't been to see it yet and the seller didn't knw a great deal about it I'll post sum pics when I go to view!!

 

 

 

 

 

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A word of warning, be very wary if the stove is not still in situ or you cant pressure test the boiler.

slim

[openspaceman]

Could someone please explain what the cold spot is and its effect?

thanks

 

slim

 

There are three Ts you need for a for complete combustion:

 

Turbulence, the gases must be able to mix well enough to ensure an oxygen molecule meets a fuel molecule.

 

Time, the gases must have enough time to complete their reaction before they get too cold.

 

Temperature, the reactions will not complete if they are quenched.

 

This last one is what a cold spot in the combustion chamber can do. An illustration of this can be done with a candle and spoon. A candle wick is self optimising in that it is designed to curve out of the flame, where it is protected from oxidation, outside the flame it burns and so its length remains constant and the flame remains clean. Hold a spoon above the flame and it too remains clean. Lower the spoon into the flame and it robs heat, becomes a cold spot, what happens to the spoon?

[slim reaper]

Thanks for that, I cant really see why it should be put forward as minus against a properly designed stove + boiler with an output sufficient to run the required number of rads and heat the room its in though.

slim