Coal required to initially heat up your stove

Post Reply
 
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 » Wed. Jan. 17, 2018 7:32 pm

Example for a 500 lb. stove, which is 10% cast iron, 20% fire brick, and 70% carbon steel (by weight). Heating it from 70 degrees to 450 degrees F.

Specific Heat Capacities:
Cast Iron = 0.110
Fire Brick = 0.210
Carbon Steel = 0.120

Stove Material Weights:
Cast Iron = 50 lbs.
Fire Brick = 100 lbs.
Carbon Steel = 350 lbs.

450 degrees minus 70 degrees = 380 degrees of rise

Cast Iron: 0.110 x 50 x 380 = 2,090 BTU's
Fire Brick: 0.21 x 100 x 380 = 7,980 BTU's
Carbon Steel: 0.120 x 350 x 380 = 15,960 BTU's

Total BTU's = 2,090 + 7,980 + 15,960 = 26,030 BTU's

For anthracite at 12,250 BTU's/Lb. (as delivered):

26,030/12,250 = 2.13 lbs.

2.13/0.70 = 3.04 (efficiency adjusted)

It takes only about 3.04 lbs. of anthracite to heat a typical 500 lb. stove from 70 degrees to 450 degrees. Just thought you might want to know.

 
User avatar
Lightning
Site Moderator
Posts: 14659
Joined: Wed. Nov. 16, 2011 9:51 am
Location: Olean, NY
Stoker Coal Boiler: Modified AA 130
Coal Size/Type: Pea Size - Anthracite

Post by Lightning » Wed. Jan. 17, 2018 7:54 pm

I will subtract three pounds of coal from my yearly heating requirements. That is some awesome figuring right there!

 
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 » Thu. Jan. 18, 2018 5:35 pm

This critical knowledge when combined with about $3 might get you a cup of coffee at Starbucks. :)

 
User avatar
hotblast1357
Member
Posts: 5657
Joined: Mon. Mar. 10, 2014 10:06 pm
Location: Peasleeville NY
Stoker Coal Boiler: 1984 Eshland S260 coal gun
Coal Size/Type: Lehigh anthracite pea
Other Heating: air source heat pump, oil furnace

Post by hotblast1357 » Thu. Jan. 18, 2018 5:42 pm

Ok so what about a boiler now?! Say the AHS 130.


 
User avatar
Lightning
Site Moderator
Posts: 14659
Joined: Wed. Nov. 16, 2011 9:51 am
Location: Olean, NY
Stoker Coal Boiler: Modified AA 130
Coal Size/Type: Pea Size - Anthracite

Post by Lightning » Thu. Jan. 18, 2018 5:49 pm

hotblast1357 wrote:
Thu. Jan. 18, 2018 5:42 pm
Ok so what about a boiler now?! Say the AHS 130.
Add a percentage for the extra steel and then add in the gallons of water that need to achieve temperature.

 
User avatar
hotblast1357
Member
Posts: 5657
Joined: Mon. Mar. 10, 2014 10:06 pm
Location: Peasleeville NY
Stoker Coal Boiler: 1984 Eshland S260 coal gun
Coal Size/Type: Lehigh anthracite pea
Other Heating: air source heat pump, oil furnace

Post by hotblast1357 » Thu. Jan. 18, 2018 6:38 pm

Lightning wrote:
Thu. Jan. 18, 2018 5:49 pm
Add a percentage for the extra steel and then add in the gallons of water that need to achieve temperature.
I’m not doing that!

That’s what Larry’s for! Lol

 
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 » Thu. Jan. 18, 2018 6:52 pm

The specific heat capacity of water is 1.00

 
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 » Fri. Jan. 19, 2018 11:41 am

I gave some thought to this, and insulating firebrick might be on average about 1,200 degrees where in contact with the coal and the fire, but closer to only 450 degrees on the backside where it meets up with the carbon steel. Therefore, firebricks midrange temperature is (1,200 +450)/2 = 825 degrees. Thus the correction:

Cast Iron: 0.110 x 50 x 380 = 2,090 BTU's
Fire Brick: 0.21 x 100 x 825 = 17,325 BTU's
Carbon Steel: 0.120 x 350 x 380 = 15,960 BTU's

Total BTU's = 2,090 + 17,325 + 15,960 = 35,375 BTU's

For anthracite at 12,250 BTU's/Lb. (as delivered):

35,375/12,250 = 2.89 lbs.

2.89/0.70 = 4.13 Lbs. (efficiency adjusted)

Final answer: It takes roughly about 4.13 lbs. of anthracite to heat a typical 500 lb. stove from 70 degrees to 450 degrees.


 
User avatar
2001Sierra
Member
Posts: 2211
Joined: Wed. May. 20, 2009 8:09 am
Location: Wynantskill NY, 10 miles from Albany
Hot Air Coal Stoker Stove: Keystoker 90 Chimney vent
Coal Size/Type: Rice
Other Heating: Buderus Oil Boiler 3115-34

Post by 2001Sierra » Fri. Jan. 19, 2018 12:22 pm

Final answer: It takes roughly about 4.13 lbs. of anthracite to heat a typical 500 lb. stove from 70 degrees to 450 degrees.
[/quote]

Plus 2 beers :yes:

 
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 » Fri. Jan. 19, 2018 12:33 pm

2001Sierra wrote:
Fri. Jan. 19, 2018 12:22 pm
Plus 2 beers :yes:
Absolutely!!!

 
User avatar
Lightning
Site Moderator
Posts: 14659
Joined: Wed. Nov. 16, 2011 9:51 am
Location: Olean, NY
Stoker Coal Boiler: Modified AA 130
Coal Size/Type: Pea Size - Anthracite

Post by Lightning » Fri. Jan. 19, 2018 12:43 pm

Rut Roh Larry, the coal bed has to heat up too. Mine is a 100 pounds worth. That'll take another pound.

 
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 » Fri. Jan. 19, 2018 1:01 pm

Lightning wrote:
Fri. Jan. 19, 2018 12:43 pm
Rut Roh Larry, the coal bed has to heat up too. Mine is a 100 pounds worth. That'll take another pound.
Quite correct! Thanks!!! We are up to ~5 sacrificial pounds of coal.

Post Reply

Return to “Coal News & General Coal Discussions”