L21 Urban Energy and GHGs

Question 1

What is energy and its units and what does it measure

Answer 1

ability to do work
energy (Joule)= power (Watt) x time (second)

energy measures:
- electricity
- nutrition
- heating value

Question 2

Big three energy use sectors in Canada

Answer 2

• Industry (indirect impact on urban energy use_
• Transportation (direct)
• Residential (direct)

Question 3

Heating Degree Days (HDD)

Answer 3

• # of degrees that a days avg temp is below indoor temp (usually 18C)
• energy consumption from heating and industrial fuels increases w HDD (colder the days, more energy used for heating)

Question 4

how does lifecycle GHG intensity factors compare w direct GHG intensity factors

Answer 4

• lifecycle includes prosesses such as extraction, refining and transportation of fuels which increases GHG emission estimates from using direct GHG intensity factors