Hilkoil to heat exchanger info needed
- lsayre
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- 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
Based on Lightning's calculations he'll be hard pressed to heat 3 feet of hot water baseboard.
- 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
Lets look at this from an admittedly well oversimplified surface area perspective:
A stove with a firebox dimension of 12 x 18 x 22 has a surface area of 1,752 square inches.
A 30 inch water pipe of 1" diameter has a surface area of 95.8 square inches.
95.8/1752 = 0.0547
If the stove is generating 35,000 BTUH, and 20% of the heat is being sucked out the chimney, and the rest is being absorbed by whatever surface area it hits (and then later radiated), then the pipes exposure is:
35,000 x 0.80 x 0.0547 = 1,532 BTUH available to the water pipe
A stove with a firebox dimension of 12 x 18 x 22 has a surface area of 1,752 square inches.
A 30 inch water pipe of 1" diameter has a surface area of 95.8 square inches.
95.8/1752 = 0.0547
If the stove is generating 35,000 BTUH, and 20% of the heat is being sucked out the chimney, and the rest is being absorbed by whatever surface area it hits (and then later radiated), then the pipes exposure is:
35,000 x 0.80 x 0.0547 = 1,532 BTUH available to the water pipe
- Lightning
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- Location: Olean, NY
- Stoker Coal Boiler: Modified AA 130
- Coal Size/Type: Pea Size - Anthracite
Another thing to consider Larry is that at most, only half of the pipe is facing the fire to pick up radiant heat directly from the source. The other half of the pipe, not facing the fire, can only pick up heat thru conduction via the hot gases around the pipe. Whereas, the entire fire box itself has a direct line of sight to the heat source for radiant heat, the pipe however does not. So I wouldn't expect to get the full 1500 BTUs that you figured.
- 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
And another thing to consider is that 35,000 BTUH requires eating ~2.85 lbs. of coal every hour. Or about 68.5 lbs of coal per day. Others will need to chime in to tell me if that sounds like more or less coal than they burn on an average day, or if it is about the norm.Lightning wrote: ↑Wed. Sep. 19, 2018 12:11 pmAnother thing to consider Larry is that at most, only half of the pipe is facing the fire to pick up radiant heat directly from the source. The other half of the pipe, not facing the fire, can only pick up heat thru conduction via the hot gases around the pipe. Whereas, the entire fire box itself has a direct line of sight to the heat source for radiant heat, the pipe however does not. So I wouldn't expect to get the full 1500 BTUs that you figured.