CONS 425 Lecture Notes - Lecture 2: Energy Transition, World Energy Outlook, Energy Poverty
11 Oct 2017
School
Department
Course
Professor
Hisham Zerriffi
CONS425: Energy Primer
What Exactly is “Energy”?
! Energy is the ability to do “Work”
! Energy cannot be created or destroyed (Energy Conservation
– 1st law of thermodynamics)
! However, it can be converted:
OUR ENTIRE SOCIETY IS
BASED ON ENERGY CONVERSION
! Conversion à Losses
! e.g. car engine
2
Energy Conversion and Entropy
! Entropy is a measure of the “quality” of the energy
! Conversion à Greater Entropy (Lower Quality)
! Chemical energy of gasoline à Energy used to power car
PLUS heat, friction, etc.
! 2nd Law of Thermodynamics – Energy degradation is
irreversible.
3
Document Summary
Energy is the ability to do work . Energy cannot be created or destroyed (energy conservation. Entropy is a measure of the quality of the energy. Chemical energy of gasoline energy used to power car. 2nd law of thermodynamics energy degradation is irreversible. Energy: a measure of work done often in joules. Power: a measure of work done per second joules/second = Final energy: energy resources as consumers see it. Energy service: the benefit received from energy consumption. Energy vector: a way of moving energy from where it is produced to where it is used. Efficiency gain: improving energy use to perform a task. Bright sunlight equal to a 100w light bulb at 1 meter. Typical diet 2000 kilo calories = 8 mj per day. Advanced lithium battery 0. 5 mj per l. Coal 1 kg = 24 mj. 2. 75 kg co2 / kg coal = 1200 g co2 per wh. Car 150 hp = ~110 kw.
