Mark, thanks for the details on the basic principle of how the A/C works. I always wondered how these darned things do what they do to cool air and make things comfortable.
So in essence, more modern units went with the slinger so that it cools the condenser more efficiency by making use of that condensate in the pan. However like you say, that creates the problem above which does as you describe, makes the compressor work harder to compress the refrigerant, if those coils are hotter because the air flow is restricted by the felt like sheet of dust, like in the photo.
What I wonder is, like the old units and they worked fine, maybe more wattage but still, is this "slinger design" that further cools or consistently lowers the coil temperature further than the previous designs that did not sling water on the coil, really any better, given the propensity to collect dust and do the above, mind you which was years worth, maybe since new. I would imagine one seasons worth may or may not be nearly as much but after some run time, its likely to still coat enough to restrict the air flow and then you are no better off than if it was not slinging water because the coil is not 100% clean. I would assume there is some loss built into the coil size and or how the unit is built. I am now wondering should I silicon up the weep hole or just leave as is, its nice to know the coil stays clean, per the almost nil accumulation from last season, it needed almost no cleaning at all, seems to me you are right the increased dust accumulation, all makes sense now, thanks for posting this !
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