What does the cooling tool tip tell me

[EcoStruxureIT]

Cooler supply temperature

Cooler supply temperature is a function of cooler capacity and its control algorithm; however, it can be written generally as a function of cooler return temperature and cooler airflow rate.
The tool tip appears in the Cooling view when hovering over a cooling unit in the layout.

Cooler return temperature

Cooler return temperature is the result of the mixing of streams which originate at rack exhausts or from the ambient.
The tool tip appears in the Cooling view when hovering over a cooling unit in the layout.

Rack inlet temperature

Rack inlet temperature is the result of the mixing of streams which originate at each cooler source or from the ambient.
The tool tip appears in the Cooling view when hovering over a rack in the layout.