how could I specifiy the rated power of pumps and fans in TRNSYS?

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Dear all

I have simulated an air handling unit. This is a base simulation, meaning that the detail dimentions and specifications of the components is not included. For example, the cooling coil is simulated using type 508d by specifying the bypass factor, so the number of rows ans tubes is not specified. So I can not calculate the pressure drop of the components. I have fans and pumps, having just the flow rate, how could I specify the rated power of them? Thank you