Multiple secondary pumps of different sizes

asked 2021-12-03 02:38:14 -0600

Keigo's avatar

updated 2021-12-04 12:20:20 -0600

Aaron Boranian's avatar

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?

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Comments

I think your second sketch is doable, but the more difficult part would be controlling/staging the pumps for which you would likely need an EMS program.

ericmartinpe's avatar ericmartinpe  ( 2021-12-09 10:20:57 -0600 )edit

Thank you for your comment. I jumped to a conclusion that my second sketch was impossible because OpenStudio didn't allow me to do such connections. I'll try in IDFEditor and see if there is any error. If I can model the chilled water loop, I'll try to control pumps by EMS.

Keigo's avatar Keigo  ( 2021-12-09 11:19:24 -0600 )edit
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