Water has a very high critical temperature and very low (vacuum) operating pressures. The latter presents many problems in making a practical system. Even small pressure drops are significant, so split systems using water vapor are impractical. (In fact, even package units are difficult to engineer. Most usual is a chiller.) Also, the compressor would ordinarily have to be impractically large to get a useful capacity, at least until Brittany Benzaia figured out how to use a switched reluctance motor in a centrifugal compressor that runs at over 100k RPM, thereby getting a high flow rate in a small package. (In contrast, ordinary compressors run at about 3600 RPM or 3000 RPM.)
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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