Heat Load

 
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Rob R.
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Post by Rob R. » Sun. Nov. 24, 2013 2:20 pm

Fire seen in the video was fully stabilized. Boiler was at 180F degrees, internal stack temp. was 360F degrees...it ran at (approximately) those conditions for 60 minutes until the boiler reached 185F and shut down. You have to guess the heat load. :P



 
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Post by lsayre » Sun. Nov. 24, 2013 2:24 pm

Assuming 20 pounds of coal consumed in one hour, and with an output delivery of 8,600 BTU's per pound, I'm guessing a heat load of 172,000 BTU's. That's a lot of BTU's.

 
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Post by Rob R. » Sun. Nov. 24, 2013 2:27 pm

Thankfully the stoker is not set that high. It would have been way to easy if I told you the feed rate...you are supposed to guess based on the appearance of the fire and flames. The blue-blooded EFM guys know how high the flames go at an approximate air setting. :)

 
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Post by lsayre » Sun. Nov. 24, 2013 2:32 pm

Rob R. wrote:Thankfully the stoker is not set that high. It would have been way to easy if I told you the feed rate...you are supposed to guess based on the appearance of the fire and flames. The blue-blooded EFM guys know how high the flames go at an approximate air setting. :)
Thank God! I'm guessing that it would probably require a sustained outside temperature of -30 to -40 degrees F. for you to actually need 172,000 BTU's per hour. If permitted a second chance, and given the temperatures outside right now I'm going to guess ~52,000 BTU's. Roughly 6 lbs. per hour.

 
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Post by waldo lemieux » Sun. Nov. 24, 2013 2:41 pm

Dude ,
Its sunday afternoon and judging by the # of empty Schlitz cans on the coffee table I cant be doin any calculus at the present time. But in my limited experience ,Im sayin 5-6 feed 6-7 air? gota go Im gettin thirsty again :out:

 
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Post by Pacowy » Sun. Nov. 24, 2013 3:01 pm

I don't have the same opportunity Rob used to have to gaze upon the fire of an S-20 while sipping a cold one, but I'll say it's set at 5 teeth, feeding 12.5 lb/hr of well-sized rice, and during that hour it put 12.5 lb/hr x 12,250 BTU AR/lb x 0.9 burned lb/total lb x 0.8 gross boiler output/gross boiler input = 110,250 BTU into the boiler water. About 3000 of that went toward raising the temp of the system from 180 to 185 deg, so if the water in the pipes and radiators was already at 180 deg when the hour started, my guess would be that about 107,250 BTU was produced by the boiler to carry the load (including pickup) for that hour.

Mike

 
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Post by Rob R. » Sun. Nov. 24, 2013 3:20 pm

Have you been snooping around in my basement? Yes, it is set on 5 teeth, and the rice contains very little undersized pieces. System probably holds ~75 gallons of water.


 
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Post by GoodProphets » Sun. Nov. 24, 2013 3:24 pm

I noticed your baffle plate on another one of your videos and then just now,

that top one, is it in correctly or is it in the way you want it to be?

Mine slants down towards the door.

 
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Post by Rob R. » Sun. Nov. 24, 2013 3:27 pm

GoodProphets wrote:I noticed your baffle plate on another one of your videos and then just now,

that top one, is it in correctly or is it in the way you want it to be?

Mine slants down towards the door.
Mine is slightly warped, but it hangs straight...parallel to the front and back of the boiler.

Sounds like yours is not seated properly.

 
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Post by GoodProphets » Sun. Nov. 24, 2013 4:11 pm

At 1:20 you can see the inside.

This is the third plate hanging from side to side.
Mine is sloped to the front, and yours looks like it is backwards to mine and is parallel to the two others.
There is two stops welded to the sides to give it the slope.

I was just wondering if yours just looks vertical, or just an illusion?


 
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Post by Rob R. » Sun. Nov. 24, 2013 4:18 pm

The baffle in mine hangs vertically, and it should in yours as well. Those aren't "stops" to hold the baffle, they are "stays" welded in the boiler and you have to wiggle the baffle around them when you hang it in place.

 
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Post by Phil May » Sun. Nov. 24, 2013 4:20 pm

That chicken *censored* load I will take some pics of my 700 eating through a 55 gallon barrell of buck a day.

 
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Post by GoodProphets » Sun. Nov. 24, 2013 4:27 pm

So I should take it off and then push it straight up behind the "stays" and let is hang vertically from I think the two "v's" that it hangs?

Could that relate to my excessive high flue temps?
I guess there is only one way to find out!

It is stoking now, so I will have to let it cool a bit before I try

 
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Post by Rob R. » Sun. Nov. 24, 2013 4:27 pm

Phil May wrote:That chicken *censored* load I will take some pics of my 700 eating through a 55 gallon barrell of buck a day.
Where did I say it was big? Just wanted to see if anyone could guess on the boiler output.

Let's see the pics and video of that 700. I want to see how the flame compares to those conversion stokers Mike is always talking about.

 
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Post by Rob R. » Sun. Nov. 24, 2013 4:28 pm

GoodProphets wrote:So I should take it off and then push it straight up behind the "stays" and let is hang vertically from I think the two "v's" that it hangs?

Could that relate to my excessive high flue temps?
I guess there is only one way to find out!

It is stoking now, so I will have to let it cool a bit before I try
Yes. Let it cool and wear welding gloves.


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