[EnergyPlus_Support] Plant scheme Problem

["energypluser" <energypluser@xxxxxxxxxxxx>]

Dear all

I am using a purchased chilled water accompany with a constant cop chiller to work as the 
cooling plant equipments. 
I want that the PCW supply the chilled water when the cooling load is less than 10kW. And the 
constant cop chiller will work to supply additional chilled water when the demand is bigger 
than 10kW ( the PCW is still working).  So I set the PCW as the primary equipment in the plant 
equipment list, and the chiller as the secondary equipment.
But I found that the chiller suppy much more chilled water during the yearly simulation, when 
the load is bigger than 10kW. For most cases, the chiller was working at its rated capacity. 
Since the flow rate of the chiller is variable and the load distribution scheme is optimal, I do 
not know how to control the chiller now.
How can I fix the problem?
Thank you in advance

mac.cz





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