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  • #16
    Originally posted by SphyrnaTek View Post
    .
    How would that affect ocean temperature? .
    Not at all.
    A very small space is exchanged and the entire ocean to exchange it back. Literally a drop in the ocean.

    Geothermal heating / cooling on land is the same.


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    • #17
      Small scale, you are right, it won't affect ocean temperature.
      But, given how we humans never seem to think things through properly until after we've F****d it up...
      Let's say the powers that be, decide to get in on Seasteading... (Do you really think they'll let us have all that lovely ocean for free ), and they then build mega cities floating over the oceans.
      Has anyone actually, looked into the possibility, that large scale OTEC can have a negative affect on the ocean...

      I know the physics, been looking at physical oceanography for the last 20 years, it used to be part of my job in another life...

      What I am trying to say is, we as a species don't have a very record when it comes to considering the environmental impact of what we do.

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      • #18
        I had read that 10,000 equitorial sea colonies of 100,000 population each using 7x 100 MW gross output OTECs would still not come close to an appreciable cooling off then planet. (The biggest reason seemed to be there is still Energy coming to the earth constantly, and so a rhythm forms) I'm digging for my sources on this one, and will let you know when I find them

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        • #19
          Source was from Marshall T. Savages "The Millennial Project: Colonizing the Galaxy in 8 Easy Steps" p.30. seems more specificly, he was discussing using algae output to sequester CO2. I need to do some math, but I can do a rough calculation to tell you how much cold seawater 10000 colonies could pump up per second, vs how much water is in ocean

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          • #20
            That's sobering. We are very very tiny creatures in the grand scheme of things. 1 colony, with 7 OTECs would draw 13,280.6m^3 seawater per second. 10,000 would draw 132,800,000m^3. That is 1.32806e-5 km^3 per second. The ocean is estimated to have 1.332 billion km^3 of water volume. Given the amount of energy given by the sun hitting the earth, and the rate of cooling from the OTECs, I don't think we would make too much of a dent in climate change that way

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            • #21
              Originally posted by AndrewKKozak View Post
              That's sobering. We are very very tiny creatures in the grand scheme of things. 1 colony, with 7 OTECs would draw 13,280.6m^3 seawater per second. 10,000 would draw 132,800,000m^3. That is 1.32806e-5 km^3 per second. The ocean is estimated to have 1.332 billion km^3 of water volume. Given the amount of energy given by the sun hitting the earth, and the rate of cooling from the OTECs, I don't think we would make too much of a dent in climate change that way
              Thanks for doing the hard work.

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              • #22
                OK, so we can be pretty confident that overall OTEC won't cause much of an issue for global ocean temperatures...

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                • #23
                  A geothermal pond loop does not change ponds temperature to heat whole house nor any of the other 3 systems (Vertical, Horizontal, DX)
                  http://www.geothermalgenius.org/how-...d-loop-fields/

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                  • #24
                    I don't doubt the numbers or the tech...
                    I doubt our ability to not miss something or just ignore a piece of the puzzle we don't like

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                    • #25
                      Originally posted by SphyrnaTek View Post
                      I don't doubt the numbers or the tech...
                      I doubt our ability to not miss something or just ignore a piece of the puzzle we don't like
                      history would tend to support this view

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                      • #26
                        We can't sit and do nothing. The highway of life is covered with the flat squirrels that didnt choose a direction when the car came. All we can do is our best

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                        • #27
                          What about some sort of wave energy generator? Or an under sea turbine that turns in the current?

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                          • #28
                            Power Generation certainly is number 1 issue. In a storm or cyclone one or two solar panels might be ok but a whole array with any tilt and wind getting underneath it could well be that some get ripped of.
                            Wave generator work good on shore, if it works at all on seastead with nothing sturdy to attache to.
                            Wind is low output, infrequent, noisy
                            It would need measuring how strong the current is but sea turbine would produce 24/7 and produce something in bad weather when solar panels not provide anything. Some example, low watt http://seamap.com/pdf/Seamap_Ampair_...on-Seismic.pdf and another for yachts https://www.wattandsea.com/en/produc...ydrogenerators

                            Edit: Ocean surface currents
                            https://imgur.com/TWz8SgE
                            Last edited by Manfred; 01-23-2019, 12:33 PM.

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                            • #29
                              Did have a look around for wave energy and found this: https://www.oceanpowertechnologies.com/#

                              and
                              https://newatlas.com/albatern-wavene...-energy/34942/
                              Lots of different models in development it seems

                              Edit:
                              As a matter of fact instead of Power generation being an issue it can generate income selling electric.
                              Here is another one (German) https://www.sinnpower.com/energy-systems
                              Waves are the most concentrated renewable energy available on this planet.
                              This way, the wave energy converter can generate enough electricity to reliably power a larger hotel resort or a small community.​​
                              Last edited by Manfred; 01-24-2019, 01:25 PM.

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                              • #30
                                Just a thought if you took the Biorock method for building the habitat spars and did the accretion in a closed area on the coast or at sea using sea water that is thickened by distilling out pure water the accretion would happen much faster proportionally.
                                You can distill sea water cheaply using gravity to create vacuum in towers over twelve meters tall with pools at ten meters surrounding them. You fill the towers up with a valve at the top close it. Then open a valve at bottom gravity pulls the water down making a vacuum at the top. next you spray 90 degree F water into the top this will instantly vaporize and expand so you have pipes to another tower this lets the pure water vapor travel over and condense in the colder tower that is chilled by evaporating the pure water that fills the second tower's pool by spraying it on the outside of the second tower. Putting a turbine between the towers can generate electricity to run the pumps etcetera.

                                At sea you can use the ocean as the pools.

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