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@khird Still think of the time it takes to extract heat energy from water, even with its relatively good characteristics. even with huge heat sinks getting the energy out of there is slow.

But more important my thinking here is not at all about practical useful, but rather the fundamental nature of the universe. It is a concept I wrote a lot about and have visited many times. In mathematical terms I am talking about Duals.

So in electronics there is the whole capacitor vs battery compromise, in that you can either have a high capacity and slow access to the energy, or low capacity but quick discharge (fast access). These two relatively constrain themselves through some fundamental law of nature i need to think more on. But it seems duals of it suggest its a fundamental idea in all of nature, so fundamental it fascinates me.

So in this case this seems as a dual expressing that same fundamental relationship, heat capacity is more or less a measure of how much energy i can git in some volume (thermal energy), and thermal conductivity is a measure of how fast you can pull that energy out (or put it in). So it seems like the thermal equivalent of a capacitor vs a battery, and I wondered if it had the same fundamental trade-off (as I suspected it did).

It seems it does...

I need to think more on this, but thats where my head is.