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Not so sure how you have done your comparison between an air-cooled and water-cooled VRF system. I suspect the curves used for each condenser type should be unique, it does not look right to me if you just simply change the condenser type from air-cooled to water-cooled but keep using the curves that have been used in air-cooled VRF outdoor unit originally. Yes, of course if different curves are used, we may not be able to have a "fair" comparison. I hope this can be a sort of "clue"?