Energy and Environment, Class 2

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Energy and Environment, Class 2

• Course Logistics
• Contracts
• Data collection for energy audit (look at
  ecological footprint analysis spreadsheet)
• Political Update
• Energy Bill Passed in August
• Arctic National Wildlife Refuge
• Coastal plain drilling not included in Energy
  Bill
• Budget Bill relies on 2.5 billion in revenues
  from leasing of the coastal plain
• This must be reconciled with current law
• Vote in late October?
• Filibuster politics

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Interpreting Graphs

• Graphs can be a very efficient way to present a
  lot of information in a very dense format.
• They can also be difficult to interpret and can
  sometimes be misleading.

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Example
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More Complex Example
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Very Complex Example
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Graphing Exercise

• Create a graph that represents the relationship
  between heating and cooling degree days and
  elevation.
• Heating degree days is a measure of the heating
  needs of a given climate. To calculate it, you
  take the average temperature for a given day and
  subtract a base temperature from that (usually 65
  deg. F). Throw out any negative results. Then
  add up the temperature difference for each day of
  the year.
• For example, if the average temperature was 55
  degrees every day of the year, the heating degree
  days would be 3650.

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Heating and Cooling Degree Days for Arizona
Locations
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Heating Degree Day Graph
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Cooling Degree Day Graph
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Exponential Growth
Basic equation of exponential growth
Where P population at time t Pi initial
population e 2.71828 r growth rate,
expressed as a fraction t time
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Example of Exponential Growth
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Doubling Time Calculation
We want to know how long it takes the Population
to double.
From the exponential growth equation
Take the natural log of both sides
(if r is expressed as a percent)