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[EnergyPlus_Support] Re: How to model the primary/secondary pump system

Hi Dr Li,

Good to see you here. Your interpretation is very good for someone without the document. I've just read this section in the users manual for the 90.1 code. It's about reflecting the chilled water pumps pumping power.

As I understand it, one must have two pumps for systems larger than 300 tons. One runs constant (primary) and the other variable (secondary).

Nominal Pump Power is 349 kW per 1000L/s. The variable pumps ride the pump curve.

The number of chillers one is asked to use is given in another table and depends on cooling capacity in tons. Sometimes they must be sized equally, other times not.

.........................................
Still I would love to know how to do a primary secondary system for cooling (6/12°C primary, 16/20 secondary) and heating (80/50°C primary, 28/24 secondary), where primary water goes to AHU coils and secondary water goes to radiant systems.

So far I've been using different plants for these systems, but I'm sure e+ can do better than that.



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