Posted by ss55 on February 20, 2013 at 16:57:02 from (173.31.19.80):
In Reply to: How much? posted by tomturkey on February 20, 2013 at 05:20:39:
That is an interesting question! I can't answer your question directly because I don't know how much power is takes to run the sheller.
Summarizing from a recent reprint of "Case Steam Engine Manual":
4 gallons of water per Brake Horse Power developed per hour.
4.5 pounds of coal per Brake Horse Power developed per hour.
A cord of good hard maple or hickory wood = 1 ton of soft coal.
A cord of red or black oak = 1500 pounds of soft coal.
A cord of dry poplar or pine = 800 to 900 pounds of soft coal.
2.5 to 3 tons of dry straw = 1 ton of soft coal
2.5 tons of dry corn cobs = 1 ton of soft coal.
200 gallons of fuel oil = 1 ton of soft coal. (Does this sound accurate?) And 2 1/2 cents per gallon fuel oil = $5 per ton coal.
If that information is accurate:
A steam engine produceing 20 HP continuously at the pulley , or 25 HP on an 80 percent duty cycle (a big thresher?) would consume: 20 HP x 4 gallons water/HP-hr = 80 gallons of water per hour, and 20 HP x 4.5 lb coal/HP-hr = 90 pounds of coal per hour.
The scary part is: 90 pounds of coal per hour x (200 gallons fuel oil per 2000 pounds of coal) = 9 gallons of fuel oil per hour for that 20 HP. I knew the old steamers were inefficient but I didn't think they were that bad.
2000 pounds/ton soft coal / 4.5 pounds coal/HP-hr = 444.4 HP-hr per ton of soft coal.
If 200 gallons of fuel oil equals 1 ton of soft coal:
444.4 HP-hr / 200 gallons of fuel oil = 2.22 HP-hr per gallon of fuel oil.
Modern diesel tractors produce around 16 Hp-hr per gallon of diesel fuel. The term fuel oil may have meant distilate or tractor fuel (all fuel?) rather than todays furnace fuel oil.
Would anyone who runs a steam engine tell us if those figures are in the ball park?
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