Efficiency of a 520 ?'

 
Pacowy
Member
Posts: 3555
Joined: Tue. Sep. 04, 2007 10:14 pm
Location: Dalton, MA
Stoker Coal Boiler: H.B. Smith 350 Mills boiler/EFM 85R stoker
Coal Size/Type: Buckwheat/anthracite

Post by Pacowy » Sun. Nov. 30, 2014 11:25 am

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


 
User avatar
windyhill4.2
Member
Posts: 6072
Joined: Fri. Nov. 22, 2013 2:17 pm
Location: Jonestown,Pa.17038
Stoker Coal Boiler: 1960 EFM520 installed in truck box
Hand Fed Coal Stove: Crane 404 with variable blower
Coal Size/Type: 404-nut, 520 rice ,anthracite for both

Post by windyhill4.2 » Sun. Nov. 30, 2014 3:53 pm

:? Did I make a mistake buying an EFM 520 ? :shock: or did I make a good decision :D :idea: Just did my own efficiency numbers, very good numbers vs previous unit,now I am :D

 
User avatar
Scottscoaled
Member
Posts: 2812
Joined: Tue. Jan. 08, 2008 9:51 pm
Location: Malta N.Y.
Stoker Coal Boiler: EFM 520, 700, Van Wert 800 GJ 61,53
Baseburners & Antiques: Magic Stewart 16, times 2!
Coal Size/Type: Lots of buck
Other Heating: Slant Fin electric boiler backup

Post by Scottscoaled » Sun. Nov. 30, 2014 4:09 pm

If you made a mistake in buying your EFM 520 then you are in good company :lol: It might be a fact that half the coal boilers ever made are EFM's. Lots and lots of mistakes. Hahahaha

 
User avatar
lsayre
Member
Posts: 21781
Joined: Wed. Nov. 23, 2005 9:17 pm
Location: Ohio
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Lehigh Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW), ComfortMax 75

Post by lsayre » Sun. Nov. 30, 2014 4:15 pm

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.

 
User avatar
windyhill4.2
Member
Posts: 6072
Joined: Fri. Nov. 22, 2013 2:17 pm
Location: Jonestown,Pa.17038
Stoker Coal Boiler: 1960 EFM520 installed in truck box
Hand Fed Coal Stove: Crane 404 with variable blower
Coal Size/Type: 404-nut, 520 rice ,anthracite for both

Post by windyhill4.2 » Sun. Nov. 30, 2014 4:24 pm

Scott & Larry, my "mistake" has me very happy so far. Larry, that should be OWB's often multiply insult to injury.

 
User avatar
rubicondave33
Member
Posts: 314
Joined: Sat. Jan. 26, 2008 10:02 am
Location: Indiana, PA
Stoker Coal Boiler: EFM DF520
Coal Size/Type: Rice/Anthracite

Post by rubicondave33 » Sun. Nov. 30, 2014 5:04 pm

OWB made me think of this:


 
User avatar
windyhill4.2
Member
Posts: 6072
Joined: Fri. Nov. 22, 2013 2:17 pm
Location: Jonestown,Pa.17038
Stoker Coal Boiler: 1960 EFM520 installed in truck box
Hand Fed Coal Stove: Crane 404 with variable blower
Coal Size/Type: 404-nut, 520 rice ,anthracite for both

Post by windyhill4.2 » Sun. Nov. 30, 2014 5:44 pm

My favorite video ! keeps reminding me of how bad it was, it makes the coal boiler look that much better & sooooo much easier !


 
coldinmaine
Member
Posts: 112
Joined: Sun. Sep. 14, 2014 11:28 am
Hand Fed Coal Furnace: old- green furnace
Coal Size/Type: nut mostly
Other Heating: pellet, wood

Post by coldinmaine » Sun. Nov. 30, 2014 5:57 pm

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%.

 
Pacowy
Member
Posts: 3555
Joined: Tue. Sep. 04, 2007 10:14 pm
Location: Dalton, MA
Stoker Coal Boiler: H.B. Smith 350 Mills boiler/EFM 85R stoker
Coal Size/Type: Buckwheat/anthracite

Post by Pacowy » Sun. Nov. 30, 2014 6:23 pm

It accounts for an assumed 10% of coal that goes unburned, which never becomes thermal input to the boiler.

Mike

 
User avatar
Scottscoaled
Member
Posts: 2812
Joined: Tue. Jan. 08, 2008 9:51 pm
Location: Malta N.Y.
Stoker Coal Boiler: EFM 520, 700, Van Wert 800 GJ 61,53
Baseburners & Antiques: Magic Stewart 16, times 2!
Coal Size/Type: Lots of buck
Other Heating: Slant Fin electric boiler backup

Post by Scottscoaled » Sun. Nov. 30, 2014 7:19 pm

I don't know Mike. You keep saying 10% unburnt. It's gotta be that coal you've been burnin'. Mine burns complete. Lehigh. :)

 
Penn507
Member
Posts: 41
Joined: Thu. Feb. 21, 2013 6:33 pm
Location: Toledo,Oh
Stoker Coal Boiler: EFM 520
Coal Size/Type: Rice

Post by Penn507 » Sun. Nov. 30, 2014 7:49 pm

Haha , yeah I didn't specify Lehigh efficiency. Love my Lehigh rice.

 
Pacowy
Member
Posts: 3555
Joined: Tue. Sep. 04, 2007 10:14 pm
Location: Dalton, MA
Stoker Coal Boiler: H.B. Smith 350 Mills boiler/EFM 85R stoker
Coal Size/Type: Buckwheat/anthracite

Post by Pacowy » Sun. Nov. 30, 2014 7:50 pm

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. :)
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.

Mike

 
waldo lemieux
Member
Posts: 2270
Joined: Sun. Sep. 30, 2012 8:20 pm
Location: Ithaca,NY

Post by waldo lemieux » Sun. Nov. 30, 2014 8:08 pm

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:

 
User avatar
Scottscoaled
Member
Posts: 2812
Joined: Tue. Jan. 08, 2008 9:51 pm
Location: Malta N.Y.
Stoker Coal Boiler: EFM 520, 700, Van Wert 800 GJ 61,53
Baseburners & Antiques: Magic Stewart 16, times 2!
Coal Size/Type: Lots of buck
Other Heating: Slant Fin electric boiler backup

Post by Scottscoaled » Sun. Nov. 30, 2014 8:12 pm

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:
99 % Satisfaction. I haven't met anyone who didn't like theirs. I guess there probably is someone out there. ;)

 
coalnewbie
Member
Posts: 8601
Joined: Sat. May. 24, 2008 4:26 pm
Location: Chester, NY
Hot Air Coal Stoker Stove: LL AnthraKing 180K, Pocono110K,KStokr 90K, DVC
Hand Fed Coal Stove: Invader 2
Baseburners & Antiques: Wings Best, Glenwood #8(x2) Herald 116x
Coal Size/Type: Rice,
Other Heating: Heating Oil CH, Toyotomi OM 22

Post by coalnewbie » Sun. Nov. 30, 2014 8:12 pm

no quorum
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.


Post Reply

Return to “Stoker Coal Boilers Using Anthracite (Hydronic & Steam)”