ESM102/week3-201701/outline-links.html

Opening slide

Main points today

• We use different forms and sources of energy.
• It is the net energy that is important (or return on energy spent).
• Infrastructure has embedded energy (just like water).
• When can small scale energy technology work?

Loopback and preview

Energy forms and measures

• standard units
  • Food calorie
  • kW*hr
  • Mega-Joule
• calculator
• energy density by weight or volume
  
• energy storage -
  • gas - Honda generator = $1000 (plus gas) or more
  • battery - Tesla Powerwall 20kWh per day = $7000 (plus electricity or solar)

Sources of energy for the US and world

• http://en.wikipedia.org/wiki/Energy_use_in_the_United_States
• http://en.wikipedia.org/wiki/World_energy_resources_and_consumption
• http://en.wikipedia.org/wiki/Fossil_fuels
• energy reserves
• http://en.wikipedia.org/wiki/Oil_reserves

Net energy is the important quantity

• net energy

Energy to build our infrastructure - embedded energy.

• example - energy used and contained in material to build houses

Smaller scale efforts might be effective sometimes

• review our goals
• scale effective technology
• water pumping
• PP vs CBA