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1. Pro 1 kW heat = 0.4 - 0.9 m³ storage space - depending on the house Dämmzustand
(inkl. Leerraum) (including space)
2. Nutzbarer Lagerraum = 2/3 Lagerraum (inkl. Leerraum) Effective storage space = 2 / 3 storage space (including space)
3. 1 mł Pelletsmenge = 650 kg 1 m³ pellets quantity = 650 kg
4. Energieinhalt = ca. 5 kWh / kg = Energy content of about 5 kWh / kg

Beispiel: Example:

Einfamilienhaus mit einer Heizlast von 15 kW Single with a heat load of 15 kW


= =


5.800 kg Pellets Jahresbedarf 5,800 kg pellets annual requirement

15 kW Heizlast x 0,9 mł / kW 15 kW heat x 0.9 m³ / kW


= =


13,5 mł Lagerraumvolumen (inkl. Leerraum) 13.5 m³ volume storage space (including space)

Nutzbarer Rauminhalt Effective capacity


= =


13,5 mł x 2/3 = 9 mł 13.5 m³ x 2 / 3 = 9 m³

Lagerraumgröße Storage room size


= =


13,5 mł : 2,4 m (Raumhöhe) = 5,6 m˛ Lagerraumfläche 13.5 m³: 2.4 m (room height) = 5.6 m ˛ storage space
(2,0 x 3,0 Meter sollte jedoch nicht unterschritten werden) (2.0 x 3.0 metres should not fall below)

Gelagerte Energiemenge Stored amount of energy


= =


5850 kg x 5 kWh / kg = 29250 kWh 5850 kg x 5 kWh / kg = 29250 kWh
(entspricht einer Heizölmenge von ca. 3000 Liter) (equivalent to a quantity of fuel oil about 3000 liters)

Nathan John Hagens

We then arrive at 2,400 X 6,400 BTUs =15,360,000 BTUs per cord. Therefore, in the 52 US states, we have 34.7 million cords of annual volume growth of wood available times 15.36 million BTUs per cord => 533 Trillion BTUs that can be presently be accessed sustainably from hardwoods.
....
Seasoned wood approaches 20% moisture content and releases about 6,400 BTUs per pound of wood. (Pure bone-dry wood tops 8,000 BTUs per pound but is not practical for home use). Almost all wood types create the same amount of BTUs per pound (6,400), but depending on their individual densities and other properties, differ in how many pounds make up 1 cord. Some examples are:

Hickory => 4,327 lbs per cord => 27.7 million BTUs per cord
Red Maple => 2,924 lbs per cord => 18.7 million BTUs per cord
Cottonwood => 2,108 lbs per cord => 13.5 million BTUs per cord
Cedar => 1,913 lbs per cord => 12.2 million BTUs per cord

...
THE ENERGY CONTENT OF FOSSIL FUELS

Each cubic foot of natural gas, depending on its origin, has about 1,027 BTU’s. #2 Heating oil has 149,793 BTU’s per gallon. Kerosene, used in some places for winter heating, produces 134,779 BTUs per gallon. In total, the amount of fossil fuels used for winter heat in the United States equates to over 7,000 Trillion BTU’s. (2001/2, a much colder winter, was 13% higher).
...
Cost per Million Btu's (MBtu) Useful Heat Into the Room:

1) Fuel oil at $2.70 per gallon: There are 149,793 Btus per gallon of fuel oil and oil furnace efficiency equals 0.80:
1,000,000 Btu x $2.70/gal
-------------------------------------
149,793 Btu/gal x .80 = $22.84/MBtu

2) Natural gas retail at $14.00/1000 cu ft, 1007 Btu/cu ft, and efficiency equals 0.85:
1,000,000 Btu x $14.00/1000 cu ft
--------------------------------------
1,007 Btu/cu ft x .85 = $16.36/MBtu

3) Wood ( red oak) at $180/ cord, 19.6 MBtu/cord, and efficiency of airtight stove equals 0.55:
1,000,000 Btu x $260/cord
-------------------------------------------
1

Oil
Cost per gallon of oil in dollars
Efficiency % Hardwood
Cost per cord of in dollars
Efficiency % Softwood
Cost per cord of in dollars
Efficiency % Electric
Cost per KWH in cents

Efficiency %
Wood Pellets or Corn
Cost per ton of in dollars
Efficiency % Natural Gas
Cost per therm in dollars

Efficiency % LP Gas
Cost per gallon in dollars

Efficiency % Coal
Cost per ton in dollars

Standard Weight [lb/sq ft]

thickness [in] Copper Clad Stainless Solid Copper

0.015 0.624 0.698

0.018 0.749 0.837

0.022 0.915 1.023

0.027 1.123 1.256
Material Property


Solid Copper (annealed/¼ hard/½ hard)

Copper Clad Stainless

Mean coefficient of thermal expansion

Mean coefficient of thermal conductivity

Density

Ultimate tensile strength

Yield Strength (0.2% offset)

Elongation in 2"

Modulus of Elasticity



9.6 x 10-6 in/in/°F (32-212°F)

226 BTU/hr/sq ft/ft/°F

0.323 lb/in3; 8.91 g/cm3

34,100 psi/37,700 psi/42,100 psi

11,000 psi/29,700 psi/36,300 psi

45%/25%/14%

17 x 106 psi



6.1 x 10-6 in/in/°F (32-212°F)

37 BTU/hr/sq ft/ft/°F

0.289 lb/in3; 8.00 g/cm3

63,000 psi

35,000 psi

30%

27 x 106 psi

Compare Fuel Costs

Always stack split wood with the bark side down. Otherwise the bark will function like a lid and prevent moisture from evaporating and the risk for mold will increase.

Top-Sealing Damper

there are four problems with hearth fires, but there are also solutions

Resources & Links

The Antique Stove Association

THE ANTIQUE STOVE EXCHANGE

09/06/2003Nostalgia drives demand for restored potbellied stoves
© 2003 The Associated Press

Tips for one-start fire building

Checklist: Hearth Tools

*Spark screen
*Poker/tongs
*Hearth broom
*Ash bucket and shovel
*Woodburner's gloves
*Wood carrier and rack
*Fire extinguisher
*Chimney fire extinguisher