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Posted by HeatPro on April 13, 2008 at 18:48:45:
In Reply to: Re: modulating burner posted by Juan Piper on April 13, 2008 at 18:33:10:
: dear heatpro,is there enough possibility of improvement in the steam production with modulation to offset the lower burner efficiency to give it a shot do we have diminishing returns here??
++ Diminishing returns with an atmospheric burner. A steam system is by its nature inefficient due to having to get the massive system up to 212F on every cycle. Steam production is only as efficient as the combustion process. What you are actually saying is that the input is too much in the first place; that is a result of the boiler/burner combination being too large for the load - if it were properly sized, you wouldn't be able to lower the input. Atmospheric boilers don't permit the same efficiency on low and high fire.
In the coming years, central heat where all rooms are heated at the same time, whether occupied or not, will be understood to be too inefficient to afford.
: should it only be done with a power burner??
++ Yes. It is a challenge for boiler manufacturers to come up with satisfactory efficiency on low and high fires with power burners.
A change to a boiler with a power burner that can be as efficient with different inputs is a better choice; but not as good a choice as a hot water boiler where each room can have a zone valve to significantly set back the temperature when unoccupied.
: thanks for your advice!~!--jp
You are welcome.
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