Boiler Room Resource Center
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Natural Gas
1030 Btu / cu. ft.
1 CF = 1000 Btu = 1 MBF
1 CCF = 100 CF = 100,000 Btu = 1 Therm
1 MCF = 1000 CF = 1,000,000 Btu = 1 DecaTherm
Oil
#2 Oil… 138,500 Btu / gal
#4 Oil… 145,000 Btu / gal
#6 Oil… 150,000 Btu / gal
Gasoline… 125,000 Btu / gal
Propane… 91,500 Btu / gal
1 Barrel oil = 42 gal
Electricity
3413 Btu / kWh
1 kW = 1000 W = 3413 Btu
1 HP = 0.746 kW = 2545 Btu/hr
kW = Volts x Amps x P.F/1000 (P.F = 0 to 1)
kW (3 phase) = Volts x Amps x 1.732 x P.F/1000
C.O.P = Btu cooling / Btu input
EER = Btu cooling / electric input watts
Heat & Power Equivalency Table
| Condensing Rate (GPM) | BTUs/hour | Lbs/hour Sq. | Ft. EDR | |
|---|---|---|---|---|
| 1 Boiler HP (BHP) | .069 | 33,475 | 34.5 | 139.4 |
| 1,000 Sq. Ft. EDR | .50 | 240,000 | 247.3 | 1,000 |
Liquid, Volume and Weight Equivalency Table
| Gallons | Cubic Feet (ft.3) | Cubic Inches (in.3) | Lbs. of Water | |
|---|---|---|---|---|
| 1 Gallon | 1 | 0.1337 | 231 | 8.334 |
| 1 Cubic Foot | 7.48 | 1 | 1728 | 62.34 |
| 1 Lb. of Water | 0.12 | 0.01604 | 27.72 | 1 |
Pressure, Head and Vacuum Equivalency Table
| Feet of head (water) | lbs./sq. inch (PSIG) | inches Hg (mercury) | |
|---|---|---|---|
| 1 foot head (water) | 1 | 0.433 | 0.883 |
| 1 lbs./sq. inch (psig) | 2.31 | 1 | 2.04 |
| 1 inch Hg (mercury) | 1.13 | 0.491 | 1 |
Wood
Approximate weight per standard cord (80 cubic feet of solid wood content) of various woods (green and air-dried to 20-percent moisture content) and potential heat of air-dried wood
| Type of Wood | Pounds green 1 | Pounds air-dried 2 | Million Btu available 3 |
|---|---|---|---|
| Ash | 3,940 | 3,370 | 23.6 |
| Basswood | 3,360 | 2,100 | 14.7 |
| Box elder | 3,500 | 2,500 | 17.5 |
| Cottonwood | 3,920 | 2,304 | 16.1 |
| Elm (American) | 4,293 | 2,868 | 20.1 |
| Hackberry | 4,000 | 3,080 | 21.6 |
| Hickory (shagbark) | 4,980 | 4,160 | 29.1 |
| Locust (black) | 4,640 | 4,010 | 28.1 |
| Maple (silver) | 3,783 | 2,970 | 20.8 |
| Oak (red) | 4,988 | 3,609 | 25.3 |
| Oak (white) | 4,942 | 3,863 | 27.0 |
| Osage orange | 5,480 | 4,380 | 30.7 |
| Pine (shortleaf) | 4,120 | 2,713 | 19.0 |
| Red cedar | 3,260 | 2,700 | 18.9 |
| Sycamore | 4,160 | 2,956 | 20.7 |
| Walnut (black) | 4,640 | 3,120 | 21.8 |
1 – Approximate weight of standard cord (occupying 128 cubic feet of space and containing 80 cubic feet of solid wood), for the first two columns of figures.
2 – To 20 percent moisture content.
3 – Potential available heat from standard cord with 100 percent unit efficiency. Heat at 20 percent moisture content.
Carbon Emissions by Fuel
Electric…1 metric ton of CO2 = (kWh * .7)/1000
Natural Gas…1 metric ton of CO2 = ((Therm/9.480) * 52)/1000
#2 Oil…1 metric ton of CO2 = (Gal * 9.84)/1000
Heavy Oils…1 metric ton of CO2 = Bbl * .43
Propane…1 metric ton of CO2 = (Gal * 12.669)/2205
Gasoline…1 metric ton of CO2 = (Gal * 19.4)/2205
Steam…1 metric ton of CO2 = Mlbs * .92356
Energy Conversion Factors
