nozzle sizing

anthonyos

has anyone advise on nozzle sizing or what factors to consider when selecting one ???

shane0007

Nozzle sizing without MI's is calculated with a specific calculation. Spray angle would be determined by the combustion chamber. Spray cone type would be determined by the chamber, boiler type, kw output & fuel being used.

esox28

A rough quick calculation is 12 x kw = kg/hr

every nozzle has kg/hr marked on its identification.

scudo2

anthonyos wrote: »

has anyone advise on nozzle sizing or what factors to consider when selecting one ???

Refer to the manufactures web site. The have done all the hard work to figure that one out and put their results out on paper for us to follow.

Billy Bunting

Danfoss do a nozzle calculator, google "Danfoss nozzle calculator", they also do an App if you have a fancy phone.

scudo2

How come there is such a major difference in nozzle sizes when you compare similar output standard modern non condemning boilers,
I've often had to reduce nozzle size in Firebird and got way better efficiency when common sense ( to me, that is ) rather than going by their book, told me that the nozzle was way to big for the surface area of the boiler.
Especially as other manufactures had lower nozzle in there simular boilers. I know some boilers are not set at max output but this is not what I'm getting at.
It just sometimes I find Firebird have to large a nozzle.

Anybody think this, or am I putting my foot in it again ?
Cheers.

corkgsxr

All oil boilers have a range. Higher up that range you go the lower the efficiency.

Maybe they needed higher output for the house

corkgsxr

Billy Bunting wrote: »

Danfoss do a nozzle calculator, google "Danfoss nozzle calculator", they also do an App if you have a fancy phone.

Whats the app called?

Dtp1979

corkgsxr wrote: »

Whats the app called?

In the apple App Store just search nozzle size

Dtp1979

While were on nozzle sizing, I came across a 2 year old grant vortex. 90/120.
The house needed no more than 50,000 btu. I rang Grant for advise to see if I could put a smaller nozzle than 90,000 btu output they had in the books. Was told no way, have to stick to the books

scudo2

Dtp1979 wrote: »

While were on nozzle sizing, I came across a 2 year old grant vortex. 90/120.
The house needed no more than 50,000 btu. I rang Grant for advise to see if I could put a smaller nozzle than 90,000 btu output they had in the books. Was told no way, have to stick to the books

Vortex is already a bigger boiler but with a smaller nozzle.

70-90 Vortex = 90-120 Euroflame
90-120 Vortex = 120-150 Euroflame

So they have already been down sized nozzle hense Grants reply on settings.

Larger Euroflame can be downsized to Vortex settings.

shane0007

scudo2 wrote: »

Vortex is already a bigger boiler but with a smaller nozzle.

70-90 Vortex = 90-120 Euroflame
90-120 Vortex = 120-150 Euroflame

So they have already been down sized nozzle hense Grants reply on settings.

Larger Euroflame can be downsized to Vortex settings.

I wouldn't agree with that. The combustion chambers are the same for both boilers. The only difference is the secondary heat exchanger between the Vortex & the Euroflame.
The boiler inputs will be the same. The outputs will differ.
Downsizing outside the manufacturer's range is not allowed & will invalidate any warranty.

corkgsxr

shane0007 wrote: »

I wouldn't agree with that. The combustion chambers are the same for both boilers. The only difference is the secondary heat exchanger between the Vortex & the Euroflame.
The boiler inputs will be the same. The outputs will differ.
Downsizing outside the manufacturer's range is not allowed & will invalidate any warranty.

You could end up running cold and condensing in the steel part and rot the boiler

scudo2

shane0007 wrote: »

I wouldn't agree with that. The combustion chambers are the same for both boilers. The only difference is the secondary heat exchanger between the Vortex & the Euroflame.
The boiler inputs will be the same. The outputs will differ.
Downsizing outside the manufacturer's range is not allowed & will invalidate any warranty.

Info supplied by Grant.

shane0007

scudo2 wrote: »

Info supplied by Grant.

Who in Grant gave you that info?

Euroflame output with 0.65 80EH nozzle set to 8.5 bar pressure is 22.7kw.
Vortex output with 0.65 80EH nozzle set to 8.5 bar pressure is 23.0kw.

The only difference is secondary heat exchanger is smaller in the Euroflame than in the Vortex.

The smaller heat exchanger cannot recoup as much energy so more is lost out the flue, thus giving a higher flue temperature & slightly lower kw output.

You cannot range a Vortex as a larger Euroflame as the difference is only 0.3kw.