Theoretical energy storage question Engineering answers

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  1. #1
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    Default Theoretical energy storage question Engineering answers

    So what are the alternatives to battery storage for solar generated power and which is the cheapest to instigate?
    High pressure air or frozen Hydrogen?
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    4K Club Member Marc's Avatar
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    Eveready?
    Whenever you find yourself on the side of the majority, it is time to pause and reflect
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    Uninsulated brick veneer house stores solar energy pretty well.

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    Frozen hydrogen??? It’d take an enormous pressure and extraordinary low temperature to freeze hydrogen. Compressed air would be more practical but be aware that ‘compressed air energy storage’ is usually used in power station sized plants - Compressed Air Energy Storage (CAES) | Energy Storage Association

    I think that ammonia energy storage is the latest way of storing hydrogen.
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    question prompted by the proposed use of a humungous Tesla battery here in Viccy. What-ever happened to Fuel cells ?
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    No need for batteries, all you need is a government with balls, not a bunch of trembling lettuces.

    There is enough energy stored in coal to give us cheap energy for the next 100 years, way passed the time that it is a safe bet we will have invented a better source of energy.
    The lettuces and the watermelons are making this transition difficult for their own little benefit. The usual pathetic display of pretend moral superiority, ignorance and insular elitism.
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    Pumped water is still the most efficient. Batteries are quickly deployable though and no one gives a rats about the Lithium mines in Africa .

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    So somewhere close to Sydney/Melbourne with height and room for a teralitre of pumped sea water, big ask
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    Fill the empty apartment blocks in Docklands with water. Possible positive use for the Melbourne eye as a water wheel?

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    Doesn’t need to be close, electricity is pretty efficient to move long distances, but ideally you do what large storage and or large height differentials, blue mountains for Sydney - just need agreement for things like dams (which the greens don’t like)

    not really a householders solution though, sorry

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    Actually asking for possible large scale; ie: Terawatt solutions
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    Tidal power turbine at the Heads should work We'd just have to close off Port Phillip for a year or three, 25 cubic kilometres of water in the bay and about 10% of it moves in and out though the heads 4 times a day
    Oh wait We can't possibly move the port somewhere with deep water can we
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    Quote Originally Posted by Moondog55 View Post
    Tidal power turbine at the Heads should work We'd just have to close off Port Phillip for a year or three, 25 cubic kilometres of water in the bay and about 10% of it moves in and out though the heads 4 times a day
    Oh wait We can't possibly move the port somewhere with deep water can we
    I have seem the outline idea for similar at arrangement elsewhere (low head, but huge volume). The idea of using the water flow in and out of the bay can certainly be used to generate a significant amount of power. It isn’t so much an energy store, but rather a method of harnessing tidal power.

    And, yep, move the ports to Geelong!
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    Quote Originally Posted by chrisp View Post
    And, yep, move the ports to Geelong!
    Ha! Geelong is even more shallow than the rest of the bay I was thinking [ like L Fox] of a full and complete move to Western Port Bay which is deeper by a long way
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    Aren’t molten salts cheaper then either method you’ve suggested??

    also depends on the application, for a single house batteries are the best bet, for a town you’re going up need something better
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    Glaubers salts are good at storing heat but how would you use that low grade stored heat to produce electricity at need?
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    Quote Originally Posted by Moondog55 View Post
    Glaubers salts are good at storing heat but how would you use that low grade stored heat to produce electricity at need?
    I think that the idea of molten salts is to store ‘high grade’ (high temperature) heat rather than ‘low grade’ heat. Low grade heat can be stored in water. This is probably the simplest energy storage system to use for PV in the domestic setting - simply heat water with the excess energy and use the water later.

    Back to your question - to generate electricity from molten salts, the heat in the salt (at 100s of degrees) is used to generate steam from water and use the steam drive a steam turbine.

    I do wonder if the idea of a micro molten salt energy storage system is viable or not for a domestic installation. It probably wouldn’t be anywhere near as efficient as a battery energy storage system though.
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    Yes I can see that working with molten Sodium metal etc
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