Hand Fired Harman Temps

Hand Fired Harman Temps

PostBy: Cap On: Mon Oct 06, 2008 10:30 pm

Hello List,
We have many new carbon burners here this season. I thought I would post some images of idea temps for a Harman hand fired. In my case, a SF 250 with the firebox reduced by 50%. Therefore my firebox is about 12"x12". Roughly the size of a Harman Mark I. Baro set at .05"wc.
My burn is at an easy simmer. This will comfortably heat a two story home & full basement with ambient temps 34F and above.
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Temps of hot air accumulating into the collector. I do not measure the actual steel plate temps. But it's hot!
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Actual flue temp. below baro damper. Notice the 68F difference to the low side? This is a great thing.
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I heat the domestic 80 gal hot water tank. 110F is perfect for a hot shower!
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Cap
 
Hand Fed Coal Boiler: Harman SF 250, domestic hot water loop, heat accumulator

Re: Hand Fired Harman Temps

PostBy: Blackdiamonddoug On: Tue Oct 07, 2008 7:11 pm

swagock valves and fitting and SS tubing and Bi-therm TI
Do you work at a power plant?
Nice job
BDD
Blackdiamonddoug
 
Stove/Furnace Make: axemen 260 rebuilt by Matt
Stove/Furnace Model: stoker AA 260

Re: Hand Fired Harman Temps

PostBy: Cap On: Thu Oct 09, 2008 7:08 pm

No to power plant but I was an industrial gas technician since I was 18. Still in the business in a different capacity.
Thanks.
Cap
 
Hand Fed Coal Boiler: Harman SF 250, domestic hot water loop, heat accumulator

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Re: Hand Fired Harman Temps

PostBy: Wood'nCoal On: Thu Oct 09, 2008 9:28 pm

Looks good, Mark.
Wood'nCoal
 
Stoker Coal Boiler: 1959 EFM 350
Hand Fed Coal Stove: Harman Magnafire Mark I
Coal Size/Type: Rice and Chestnut
Other Heating: Fisher Fireplace Insert

Re: Hand Fired Harman Temps-Update

PostBy: Cap On: Tue Dec 23, 2008 9:37 pm

I posted back in Oct with images showing the efficency of a hand fired stove when it is simmering along on a 40F day. You can see the hot air is much higher than the stack temps. Page up a few posts to see images.

Now, see below images on a cold day in the low 20's. These images from today. Last night I was pushing higher temps when ambient was in the teens. 300F hot air & 450F stack when outside temps were 17F. This hows how a hand fired stove will loose efficiency the harder it is pushed to create heat. My take on this trial, a hand fired stove is most efficient when burning at an easy simmer. Once you push the flames 6"+, heat will fly right up the stack, baro or no baro.

I've also performed tests with my baro set at .06w.c. thru .15"w.c. My conclusion is simple. The more the baro damper is open (.06), the less heat the stove will make. The more it is closed (.15), the more heat will be generated. Its all relative at a given outside temp & relative humidity. And as you create more heat, your firebox will empty sooner. Simple, right? I believe the baro damper will help for high winds & huge barometric changes to the atmosphere and or to make operation easier on an older maybe loose stove. This test was only performed using a Harman handfired, no stokers, no coal fired boilers.
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Hot air off of the heat accumulator. 250F
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Stack temps below baro damper. 410F
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Reads in metric. 1.9mm w.c. = .075" w.c.
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Cap
 
Hand Fed Coal Boiler: Harman SF 250, domestic hot water loop, heat accumulator

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