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Almost free energy (loss)

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  • #16
    There's no cover over the night sky radiator as there is in a solar collector. There is nothing between the radiating surface and the cold uncaring perpetual dark of space except a bit of atmosphere. Any intervening surface would make the process less efficient.

    The only parts you have are a metal surface and a thin film of water moving over it. The heat in the water is absorbed into the metal and then radiated out into space, never to be seen again. Assuming a water temperature initially of 54؛ F, and a night sky temperature of -70؛ C (-94؛ F), that represents quite a bit of entropic opportunity. Might be needed to add some Prestone to the water to keep it from freezing during some parts of the year.

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    • #17
      Originally posted by dp
      There's no cover over the night sky radiator as there is in a solar collector. There is nothing between the radiating surface and the cold uncaring perpetual dark of space except a bit of atmosphere. Any intervening surface would make the process less efficient.
      yes, a surface would..........Unless it kept off the condensing dew that would warm it back up and mess up the cooling................. Then some efficiency loss would be preferable to a complete failure to work.

      That cover could allow the same cooling system to work OK in a wetter climate, which otherwise would mess it up.
      1601

      Keep eye on ball.
      Hashim Khan

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      • #18
        Originally posted by J Tiers
        yes, a surface would..........Unless it kept off the condensing dew that would warm it back up and mess up the cooling................. Then some efficiency loss would be preferable to a complete failure to work.

        That cover could allow the same cooling system to work OK in a wetter climate, which otherwise would mess it up.
        I think you're missing a fundamental point - even dew is chilled if it is attracted to the water film that flows over the radiating surface. It too is collected in the storage tank along with the water sprinkled over the surface. It isn't important that the surface is warmed - the water is still cooled. It is the temperature of the stored water, not the surface temperature of the radiator that is important.

        A wetter climate, as in rain, would end the process. There is no need to protect it from rain because it would be turned off until the sky clears again. Dew just becomes more cold water when it's running under a clear sky.

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