In article PTV9k.157$K%2.34@trnddc02, "Mike"
wrote:

"Mxsmanic" wrote in message
...
Mike writes:

The "real thing" doesn't necessarily require a compressor.

So how does it work?

Some older planes had a non-compressor based system that required water. I
assume it was some sort of evaporative cooling setup. I lived in El Paso,
Texas where the temps routinely got above 43° C and I had an evaporative
cooler in my home that worked just fine.

You can also buy aftermarket systems that use ice.

There are also state-change systems that just need a heat source to
drive them, like Dometic kerosene refrigerators. Not very useful for
aircraft use, granted.