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[TRNSYS-users] How to calculate pump rated flow rate and rated power

Dear users,

In the TESS example "TESS HVAC Library Examples ‐ Restaurant with Solar Absorption Cooling" I don't understand the sizing of the pumps (rated flow rate and rated power).
The question is how to calculate these quantities? 
- in the heating loop there is a 580kg/h and a 1080kg/h pumps
- in the cooling loop (cooling tower) : 5168kg/h
- in the building loop 1500kg/h 
- for the fan coil 4312kg/h

Where these quantities come from ?

Thank you