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An interesting method used in vacuum cooling for food processing is to use a condenser, reducing vapor flow and drying the air before it reaches the vacuum pump. https://www.heuchfresh.com.au/vacuum-cooling-explained-in-6-steps/ The vacuum chilling process used is apparently several times...

The Latent Heat of vaporization for water is about 10X higher than conventional refrigerants, R11, R12, R22 = +/- 200 Kj/Kg Water over 2000 Kj/Kg engineeringtoolbox.com I'm not sure that I'd necessarily go by what was said in that video, as with the small mason jar as evaporator, it appeared...

Boiling water with a vacuum results in the water evaporating and filling the vacuum. The result being the vacuum pump has to be run almost continually in order to maintain the vacuum, which is probably not what you imagined. Essentially, you are talking about using water as a refrigerant...

thread391-419592 In response to this earlier discussion, I'm not entirely sure that some such device is impossible. In compressing air, all of the energy put into the air is generally lost as heat, The internal kinetic energy of the gas, however is retained and the gas can be expanded deriving...