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Biological refrigeration?

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Technological approaches to refrigeration tend to involve either high compression ratios of fairly exotic (from a biochemical point of view, anyway) volatile substances, or high-power, low-efficiency solid state electronics.

Neither of these seem particularly practical paths for a living organism to take for lowering its temperature.

What earthling biology has come up with is the equivalent of a swamp cooler--i.e., sweat--which dumps heat into the energy of vaporization of a consumable volatile substance (water). But if the air is already saturated, or you get dehydrated, you're screwed--a swamp cooler or sweat gland can't function anymore.

So, is there a plausible mechanism by which an organism could evolve to actively pump heat into the environment (i.e., refrigerate itself) in a closed-loop system that does not require wasted consumables like sweat?

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This post was sourced from https://worldbuilding.stackexchange.com/q/153832. It is licensed under CC BY-SA 4.0.

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