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					RENEWABLE ENERGY!
• Can be burned/used directly for heating




• Can be used indirectly by using the heat to
  produce steam to turn the turbine…
• Biogas digesters produce methane
• Methanol
• Ethanol

  – LOWERS net energy, if not LOST?
• Biodiesel:
•   HHHHH
    \/|\/
    C-----------C-----------C
    |||
    OOO
    \\\
    C=O C=O C=O
    |||
    H-C-H H-C-H H-C-H
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    H-C-H H-C-H H-C-H
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    H-C-H H-C-H H-C-H
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    H-C-H H-C-H H-C-H
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    H-C-H H-C-H H-C-H
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    H-C-H H-C-H H-C-H
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    H-C-H H-C-H H-C-H
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    H-C-H H-C-H H-C-H
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    H-C-H H-C-H H-C-H
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    H-C-H H-C-H H-C-H
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    H-C-H H-C-H H-C-H
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    H-C-H H-C-H H-C-H
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    H-C-H H-C-H H-C-H
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    H-C-H H-C-H H-C-H
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    H-C-H H-C-H H-C-H
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    H-C-H H-C-H H-C-H
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    H-C-H H-C-H H-C-H
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    HHH
Cogeneration
• Using two useful sources of energy from
  the same source.

• Also called Combined Heat and Power
  (CHP)

• Electricity AND Heat

• Up to 90% efficient!!
World’s fastest growing
Energy source
high construction costs
• Passive solar energy:
  – Heating:
    • Windows with southern exposure (North. Hem.)
    • Thermal Mass: stone, concrete, adobe, brick
• South. Hem.: north facing windows
• Active
  Water
  Heating:
• Solar floor heating (radiant floor heating)
• Solar energy used to produce electricity
  – Photovoltaic Cells (PV Cells)
     • Silicon semi-conductor “doped” with phosphorus and
       boron: paper-thin
     • Sunlight energizes electrons creating an electric
       current
     • No moving parts, no pollution, little maintainance
• Solar energy on a bigger scale:
  – Solar thermal systems
     • Heliostats: move with the sun’s rays, aimed at a
       powertower
     • Power Tower: central receiving unit
• Sunlight collected and focused and can
  heat:

  – Air
  – Oil
  – Water
Old system: Centralized Power
        (Macropower)
New System: Decentralized Power
         (micropower)

				
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posted:7/25/2011
language:English
pages:34