How do I determining the "Carbon Footprint" for commercia faciiities? How does this relate to Energy Management?l
A good measure of an entities carbon foot print is how much CO2 is generated to produce the energy consumed using reasonably efficient generators for the conversion. My Solar system calculates its Carbon savings at a rate of 1.95 lbs CO2 for each KWHr generated. We are now at 3061 KWHrs generated since installation for 5968 lbs CO2 not generated.
The Rocky Mountain Institute (RMI.org) uses .9 Kg CO2 / KWHr E saved or produced cleanly for it's tradeoff studies.
Thus an average electrical consumption of 1000 KWHrs / month is equivalent to a carbon footprint of 1950 lbs CO2 released / month.
Your natural gas heating bill is measured by the meter in units of 100 cu ft Natural gas (Mostly methane CH4) corresponding closely to 100,000 BTU or 1 therm of energy. Methane burns ( is Oxidized ) with the O2 in air by the reaction CH4 + 2 O2 => CO2 + 2 H2O so 1 mole CH4 (16 g) +2 O2 (64 g) produces CO2 (44 g) + 2 H2O (36 g). Thus each cu ft of methane burned produces 103.6 g CO2 and each therm (100 cu ft) of Natural gas produces 10,364 g CO2 or 22.84 lbs of CO2.
Methane is the most hydrogen rich gas and produces the most energy per gram of CO2 produced. Propane (C3H8) and fuel oil ~(C9H20) approach half as much hydrogen and thus produce more CO2 per unit of heat
1 cu Ft of CH4 is 1.178 moles (grams equiv to molecular weight) or 1.178*16 or 18.84 grams at 0 C (32 F)
There are organisations that make it easy for you to do this - for example the Carbon Trust have specific tools to measure your business carbon footprint
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