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# Total world energy

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### Total world energy

1. 1. Total World Energy ENGR40 Foothill College
2. 2. Energy in Terawatts (TW) http://en.wikipedia.org/wiki/File:World_Energy_consumption.png
3. 3. What can we know from this info-graphic? <ul><li>Total energy in quads </li></ul><ul><ul><li>Convert terawatt to watt-second to joules to BTU (write it out and use all your units!) </li></ul></ul><ul><li>Total ‘mass’ of each fuel type </li></ul><ul><ul><li>Coal ~10,000 BTU/pound </li></ul></ul><ul><ul><li>Petroleum is ~5.8M BTU/barrel </li></ul></ul><ul><ul><li>Gas is 100,000 BTU/ cubic foot </li></ul></ul><ul><li>Total emissions from each fuel type </li></ul><ul><ul><li>Work back to mass of carbon => CO 2 </li></ul></ul>
4. 4. Working in Terawatts <ul><li>Convert TW to tWh => multiply by 8760 </li></ul><ul><li>Convert tWh to kWh (divide watts/1000) </li></ul><ul><li>Convert kWh to BTU (multiply by 3412) </li></ul><ul><li>Terawatts is not that tricky (it is a RATE of energy use) and shows total energy trends </li></ul><ul><li>If we are 15TW today (2011) how many Quads is that? What about in 2035-2050? </li></ul><ul><li>Think about energy efficiency as a lever… </li></ul>
5. 5. Converting to GHGs <ul><li>Convert BTU to pounds of carbon coal (10,000 BTU/pound) then correct for C:H (85:15) then multiply by 3.7 pounds CO 2 per pound carbon </li></ul><ul><li>Convert BTU petroleum to barrels (~5.8M BTU/barrel) then ~7 pounds (-CH 2 -) per gallon. Convert to moles (or correct for C/H ratio CH 2 ) </li></ul><ul><li>Natural gas is 1020 BTU/cubic foot and 1.26 moles per cubic foot. Convert Quads => moles CH4 = moles CO 2 . convert to pounds/tons </li></ul><ul><li>Hint: one mole CO 2 is roughly 0.1 pounds CO 2 </li></ul>
6. 6. Working with info-graphics <ul><li>One picture can be worth 1,000 data points, especially if it is a trending graphic </li></ul><ul><li>Try to calculate numbers from data points, see if the data are ‘internally consistent’. </li></ul><ul><li>What other things can you learn from a graph? (We calculated quads and GHGs) </li></ul><ul><li>Can you project the future, or ‘federate’ with other data (global/capita GDP, and energy use). What will the future look like? </li></ul>