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Thread: The Remarkable Progress of Renewable Energy

  1. Top | #411
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    Quote Originally Posted by Loren Pechtel View Post
    Quote Originally Posted by steve_bank View Post
    Saudi Arabia has large scale desalinization yet they are also buying water by the tanker. They have also attempted to tow icebergs.

    Another question nobody has mentioned. It is al about greenhouse gasses.

    Thermodynamically all consumed energy in the end shows up as heat. Being in a vacuum the only way to get rid of het is by radiation.

    Asa rough approximation from dq = m*c*dT where q is total electric power and gasoline power consumed, m is heat capacity of air, m is mass of atmosphere what amount of energy is required to raise atmosphere 1 degree c. Assunibg nass of air much less than mass of the Erath.
    This is not an important issue at current energy use levels.
    Says who? When LA turned off lights at night for some occasion the temperature dropped.

  2. Top | #412
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    Quote Originally Posted by steve_bank View Post
    Quote Originally Posted by Loren Pechtel View Post
    Quote Originally Posted by steve_bank View Post
    Saudi Arabia has large scale desalinization yet they are also buying water by the tanker. They have also attempted to tow icebergs.

    Another question nobody has mentioned. It is al about greenhouse gasses.

    Thermodynamically all consumed energy in the end shows up as heat. Being in a vacuum the only way to get rid of het is by radiation.

    Asa rough approximation from dq = m*c*dT where q is total electric power and gasoline power consumed, m is heat capacity of air, m is mass of atmosphere what amount of energy is required to raise atmosphere 1 degree c. Assunibg nass of air much less than mass of the Erath.
    This is not an important issue at current energy use levels.
    Says who? When LA turned off lights at night for some occasion the temperature dropped.
    The total power liberated by mankind is a drop in the bucket compared to what we catch from the sun.

  3. Top | #413
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    Quote Originally Posted by Loren Pechtel View Post
    Quote Originally Posted by steve_bank View Post

    Says who? When LA turned off lights at night for some occasion the temperature dropped.
    The total power liberated by mankind is a drop in the bucket compared to what we our planet catches from the sun.
    FTFY.

    Unfortunately, it's a very big planet, and solar energy is therefore very diffuse even in the tropics. So while the planet gets a lot of energy, we don't.

    The planet also has a nasty tendency to rotate, and to place clouds between the sun and the surface.

    So while the total planetary insolation is vastly more than human energy use, it's sadly impractical to use it to power a hi-tech society. For that we need much greater energy densities than are available in sunshine.

  4. Top | #414
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    In the vacuum we are in over time even with a relatively small increase in energy as heat, temperature will rise and continue to rise.

    Put a sealed box in space filled with nitrogen. Dissipate 1 mill watt in the gas with say a simple resistor. If heat internal > radiated heat by the box temperature will rise towards infinity, until the resistor and power source melts.

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