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PostPosted: Sep 13, 2018 6:00 pm 
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Joined: Jun 19, 2013 11:49 am
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One of my soon to begin PhD research proposal concept is to underground mine limestone for aggregates, pressurise with nitrogen and then use thin walled tanks of pressurised water to store heat.
The tanks can be insulated to avoid overheating the walls.

Net costs of a few US dollars per cubic metre for pressure vessel volume are going to be very hard for conventionally engineered vessels to beat.


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PostPosted: Sep 13, 2018 6:27 pm 
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Joined: Feb 25, 2011 1:55 am
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E Ireland wrote:
One of my soon to begin PhD research proposal concept is to underground mine limestone for aggregates, pressurise with nitrogen and then use thin walled tanks of pressurised water to store heat.
The tanks can be insulated to avoid overheating the walls.

Net costs of a few US dollars per cubic metre for pressure vessel volume are going to be very hard for conventionally engineered vessels to beat.


It's neat that you are pursuing publishable research on interesting thermal storage techniques. What kind of cavern pressures are you envisioning? Are you considering bag/bladder type tankage, or only fixed hard shell tanks?

Though this topic probably should be in another thread, such as the thermal pit one.


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PostPosted: Sep 14, 2018 5:13 am 
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Asteroza wrote:
It's neat that you are pursuing publishable research on interesting thermal storage techniques. What kind of cavern pressures are you envisioning? Are you considering bag/bladder type tankage, or only fixed hard shell tanks?


Currently my concept (we shall see how it stands up when I get started on the actual detailed research!) is to pressurise to about 45 bar and use hard-shell tanks with a steam blanket inside the tanks.
The plant would use the pressurised water in a modified triple flash geothermal unit, which will be simplified and more efficient since the fluid won't contain anything dissolved in it.

Heat would be stored using the feedwater heating train of a PWR/CANDU or other reactor above ground, drawing high temp feedwater out of the system, transfering the heat into the fluid to be put into the tank and then reinjecting [the feedwater] into the low temp heaters.


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