Efficiency of a 520 ?'
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The net output numbers tell you how much heat you can get out of the attached radiation based on assumptions about pickup factors applicable to steam and hot water systems. The boiler makes available the 85,870 figure; the difference between that and any of the "net" figures is losses associated with distribution piping.
For the difference between the 122,500 and 85,870 figures, my estimate would be that 12,250 represents the assumed level of unburned coal and 24,380 goes up the stack.
Mike
For the difference between the 122,500 and 85,870 figures, my estimate would be that 12,250 represents the assumed level of unburned coal and 24,380 goes up the stack.
Mike
- windyhill4.2
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Did I make a mistake buying an EFM 520 ? or did I make a good decision Just did my own efficiency numbers, very good numbers vs previous unit,now I am
- Scottscoaled
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If you made a mistake in buying your EFM 520 then you are in good company It might be a fact that half the coal boilers ever made are EFM's. Lots and lots of mistakes. Hahahaha
- lsayre
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There is no way that a coal boiler can be a mistake in comparison to an OWB. Wood is amazingly inefficient, and OWB's often add insult to injury.
- windyhill4.2
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Scott & Larry, my "mistake" has me very happy so far. Larry, that should be OWB's often multiply insult to injury.
- rubicondave33
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OWB made me think of this:
- windyhill4.2
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My favorite video ! keeps reminding me of how bad it was, it makes the coal boiler look that much better & sooooo much easier !
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pacowy.....what is the 0.9 factor for in the equation below?
Thanks to lsayre for that link, but I don't think the calculation is correct. The 74,670 figure is a net output figure, which assumes application of a pickup factor. The gross output available from the boiler is the 85,870 figure, which leads to an "overall" efficiency of 70.1%. The efficiency of the boiler vessel in converting heat actually released into boiler output is (85870/(122,500 x 0.9)=) 77.9%.
Thanks to lsayre for that link, but I don't think the calculation is correct. The 74,670 figure is a net output figure, which assumes application of a pickup factor. The gross output available from the boiler is the 85,870 figure, which leads to an "overall" efficiency of 70.1%. The efficiency of the boiler vessel in converting heat actually released into boiler output is (85870/(122,500 x 0.9)=) 77.9%.
- Scottscoaled
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I don't know Mike. You keep saying 10% unburnt. It's gotta be that coal you've been burnin'. Mine burns complete. Lehigh.
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I'm just trying to follow the old-school directions: "While it is known that a slight amount of coal in the ash indicates a good air setting and a minimum of stack loss, the owner prefers a well burned out ash. As a result, the majority of stokers in residences are operating with excess air, a higher stack loss but a better looking ash." Somewhere I'll find the doc that said 10%, but for now I'm using it as an estimate of the amount of unburned that can be expected with efficient operation. I'm not saying it's exactly 10 percent in all cases.Scottscoaled wrote:I don't know Mike. You keep saying 10% unburnt. It's gotta be that coal you've been burnin'. Mine burns complete. Lehigh.
Mike
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So It seems there will be no quorum on this matter so could we all agree that the efm 520 exhibits Excellent efficiency and nearly 100% Proficiency? :discuss:
- Scottscoaled
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99 % Satisfaction. I haven't met anyone who didn't like theirs. I guess there probably is someone out there.waldo lemieux wrote:So It seems there will be no quorum on this matter so could we all agree that the efm 520 exhibits Excellent efficiency and nearly 100% Proficiency? :discuss:
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Given the illustrious posters we may agree we are quorate but there is no agreement. That is merely a reflection of the complexity of the variables.no quorum