Cryogenics

[weknowthewor]

How was cryogenics found?

 

Any answers please...

 

Thanks..

[Rocket Man]

what do you mean "cryogenics" do you mean cooling systems or the means to freeze a frog and thaw it some years later only to watch it come back to life?

cooling systems were developed slowly over a long time, the early ones were simply a wet hessian sack then someone worked out they could do it with ammonia then freon.

 

edit: seeing as though you put this under engineering you're probably talking about heat pumps

[insane_alien]

some guy figured out that if you had two radiatiors a pump and an expansion valve with a compressible fluid that you could get really really cold temperatures

[Rocket Man]

i think the ammonia systems were first, they used water to absorb ammonia gas to create a low pressure zone (cold) then heat to separate the two again then cooled the components back to room temperature to finish the cycle.

solid-state heat pump fueled entriely by heat... work that one out.

[Drilon]

Does cryogenics work on humans, I read somewhere that it doesn't work because the cells would die as soon as they come back to life from the cold temperature.

[Cap'n Refsmmat]

It tends to have problems with frozen water - the water in cells expands as it freezes, destroying cellular structures. The basic solution is to use antifreeze, but that has to be perfected.

[Mokele]

Actually, it's less the expansion (cells are quite elastic), and more that ice crystals are these long, pointy shards that slice up the cell membrane and organelles.