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Multiple secondary pumps of different sizes

For chilled water loop, I want to model multiple secondary pumps of different sizes as illustrated below, but I don't know how to model them.

image description

In real projects, we often use multiple secondary pumps of different sizes in order to flexibly adapt to different cooling loads. When cooling load is very small, only small secondary chilled water pumps operate. But how can I model them in EnergyPlus?

HeaderedPumps:VariableSpeed can specify only Total Design Flow Rate and Number of Pumps, so I can't specify water flow rate of each pump. My second sketch is also unlikely. I think we can't use Connector:Splitter and Connector:Mixer like this.

Can anyone advise me on how to model such pumps?

Multiple secondary pumps of different sizes

For chilled water loop, I want to model multiple secondary pumps of different sizes as illustrated below, but I don't know how to model them.

image description

In real projects, we often use multiple secondary pumps of different sizes in order to flexibly adapt to different cooling loads. When cooling load is very small, only small secondary chilled water pumps operate. But how can I model them in EnergyPlus?

HeaderedPumps:VariableSpeed can specify only Total Design Flow Rate and Number of Pumps, so I can't specify water flow rate of each pump. My second sketch is also unlikely. I think we can't use Connector:Splitter and Connector:Mixer like this.

Can anyone advise me on how to model such pumps?