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Jun 15, 2022 at 2:40 vote accept Robert Robert
Jun 9, 2022 at 10:29 history edited lupe CC BY-SA 4.0
added 240 characters in body
Jun 9, 2022 at 10:24 comment added lupe another random thought on this - my enzyme kinetics is only dimly remembered, but if you had an enzyme that catalysed the ammonium nitrate/water reaction, I think you'd get it to go colder - I think in the absence of a catalyst, it is self limiting because the colder it gets the less molecules can clear the activation energy threshold, and therefore fewer reactions occur. It'd still self limit with a catalyst, but maybe at considerably colder temperatures. Biology loves making catalysts for things, too :P
Jun 9, 2022 at 10:20 comment added lupe and yeah, pumps are hard to protect from cold there -though I can conceive of a structure like the diaphragm, where you decouple the muscles from the thing doing the pumping, which would let you have your highly oxygenated, warm muscles without the heat
Jun 9, 2022 at 10:14 comment added lupe I'd agree that the endothermic reaction would be tough - how cold are you looking for? Maybe something that evaporates super fast would work. I'm thinking that pressurizing a chamber would happen relatively slowly, with the creature able to redistribute or radiate the heat caused by the high pressure gas. So you'd end up with a reservoir of, say, body temperature nitrogen in a liquid state, which would cool rapidly on release.
Jun 9, 2022 at 10:12 comment added Robert Robert In regard to protecting rest of the body from the cooling effects. I do know some structural ways to protect the tissues from the refrigerant...in everything except the pumps. Yeah those needing to be on a flexible, low thermal conductivity, high strength yet oxygenated structure kinda screws me. Thanks I would not have caught that without you.
Jun 9, 2022 at 9:58 comment added Robert Robert First thanks for replying. I haven't yet found an endothermic reaction absorbs enough heat for my purposes. For the High pressure gas reservoir idea wouldn't I still need to cool it back down as pressurizing the gas would cause it to heat up?
Jun 9, 2022 at 7:57 history answered lupe CC BY-SA 4.0