I went back through my spreadsheet and found a couple of errors in the math, in both the evaporated-water and fan CFM calculations. After correcting them, both numbers are pretty close, within .07%. That's scary-close. I would have been pleased to have them within 5%. If nothing else, I would have expected the (cheap) fan I bought not to really deliver 1700CFM.
The corrections also showed that the amount of heat power being transferred is amazingly high, but water does require a lot of energy to change it from its liquid to gas phase. The fact that a lot of heat energy is being moved around suggests that my indirect-cooled A/C setup has a chance of really working, but we shall see.
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