in calculating cooling loads, the terms of the coincident conditions also need to be standardized. These conditions had divided into 2 parts: One is to obtain the wet design temperature of standardized instead of simple design temperatures and the other is to find the dry temperature of standardized instead of the wet temperature of simple design.
The first is used to calculate and select refrigeration cooling systems and the second is used to design and select evaporative cooling systems.
See the ASHRAE Handbook of Fundamentals chapter on Psychrometrics. The seminal work on the subject is that of Hyland & Wexler. You can use my Excel Add-In at this link http://dudleybenton.altervista.org/software/index.html Cooling loads are also covered in another chapter of the ASHRAE Handbook. I have a lot of free resources for refrigeration and evaporative cooling too if you need something.
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