Regarding the heat rejection of evaporative condensers

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I’ve read some documents and posts by forum members regarding the selection process for evaporative coolers: 1. First, calculate the heat discharge under actual operating conditions; 2. Determine the correction factor based on the condensation temperature and wet-bulb temperature; 3. Multiply these two values to obtain the total heat discharge; 4. Compare this total heat discharge with the standard heat discharge values of different devices from various manufacturers in order to make a selection. I have two questions: 1. Is there any theoretical basis for this correction factor? Is it still something produced by the manufacturer themselves? 2. How is the standard heat output of a manufacturer’s products calculated? Under certain operating conditions? Do different manufacturers have the same standard operating conditions?