objects/energy-conversion-factors.html

Energy Conversion Factors and Estimates

Energy Units

1 BTU * 0.00029 = 0.00029 kW-hrs

1 BTU * 1054.8 = 1054.8 J

1 Kcal * 0.001163 = 001163 kW-hrs

1 J * 0.001 = 0.001 BTU

1 kW-hr * 860.5 = 860.5 Kcal

1 kW-hr * 3.6 *10^6 = 3.6*10^6 J

1 Kcal * 0.001163 = 0.001163 kW-hrs

1 hp = .75 kW

1000 Kcal/day = 0.048 kW

Embedded Energy

Raw Wood

• Maple = 25.5 x 10^6 BTU per cord
• 1.8 Kcal/ pound
  • 4 Kcal/gram * 450 g/lb = 1800 Kcal/lb
• 25.5 * 10^6 BTU per cord * 0.00029 = 7.4 * 10^3 kW-hrs per cord
• $120 per cord
• $120 (dollars per cord) / 7.4 * 10^3 (kW-hrs per cord) = $ 0.016 kW-hr

Manufactured wood products

add the energy used to transport, process, mill and other modifications

per kg of final usable wood

How do you subtract out the use of wastes (hog fuel for example)?