Low heat value, or inefficient boiler.

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McGiever
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Stoker Coal Boiler: AXEMAN-ANDERSON 130 "1959"
Hand Fed Coal Boiler: BUCKET A DAY water heater
Hand Fed Coal Stove: Warm Morning 414A
Coal Size/Type: RICE,PEA,NUT,STOVE /ANTHRACITE and EGG / BIT
Other Heating: Ground Source Heat Pump and some Solar
Location: Junction of PA-OH-WV

Post By: McGiever » Mon. Jan. 28, 2019 1:08 pm

That all makes sense...nice that you were able to work this all out for yourself, I'm impressed. :)

franco b
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Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
Baseburners & Antiques: Glenwood Modern Oak 114
Coal Size/Type: nut and pea
Location: Kent CT

Post By: franco b » Mon. Jan. 28, 2019 1:43 pm

Excellent reasoning. Just what is needed for better designs.

Bubbalowe
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Hand Fed Coal Stove: Vigilant II 2310
Baseburners & Antiques: Grodin Petite
Other Heating: electric radiators until used boiler hook up

Post By: Bubbalowe » Tue. Jan. 29, 2019 2:54 pm

Just read through and think the barrel boiler pretty cool. Barrel stoves pass heat faster than cast iron so think copper laying on tin should have good heat transfer? In my beer making hobby I've used immersion style wort chillers and counter flow chillers, same principle, to absorb heat. Something to consider is flow of water ie, slow flow down to allow more heat to be absorbed, 99C out being best. Measure water temperature into boiler, out of boiler, into house and back to boiler to get the most. Maybe just a gate valve inline for control?


DR ARNETT
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Post By: DR ARNETT » Sun. Apr. 07, 2019 8:14 pm

U MIGHT TRY ANTHROCITE NUT COAL FROM TRACTOR SUPPLY IF IT'S AVAIABLE WHERE U ARE I GET IT STARTED W/ WOOD THROW IN 'BOUT 30-40 LBS . ONCEIT GETS GOING BANK IT BACK IT SHOULD GO 6-8 HRS . MY HOME IS APRX. 400 FT SQ. I USE NATURAL DRAFT I DO HAVE A GRATE THOUGH. IF U CAN GET BIG CHUNKS OF BIT. COAL [ 10'' OR SO ] THAT WORKS BETTER.

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BigBarney
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Post By: BigBarney » Tue. Apr. 09, 2019 4:35 pm

I like the way the grate looks but in reality the size is way overkill.

I guess 20" wide x 26" deep you have enough grate area for at least

200,000 btu of output , with descent coal. I believe grates this large

would be hard to shake even in three sections.

Typical grates of ~250 sq in get about 350 btu per sq in .,

so you have enough grate area for ~190,000 btu boiler .

At 20 watts per sq ft your home needs 4KW of heat or

~12,500 btu per hour on a 10* F day.

BigBarney

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