What is a Variable Primary Flow Pumping System?

This educational video provides a brief overview of what a Variable Primary Flow chilled water pumping system looks like, and it provides a basic comparison to a Primary/Secondary pumping system.
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The video that follows is for educational use only. It is not intended as a substitute for full professional training or careful job planning, as each installation varies in its individual circumstances. Professional judgment is required with each installation, in conjunction with any applicable laws, regulations, or building codes. Copyright Johnson Controls International Plc 2016. All rights reserved.

[@Chemoholic_Z]

Please add more educational videos. Thanks in advance

[@joydipghosh3273]

can you share any link where should i download autocad design sample about primary varable & primary secondary design ..it will be easy for me to understand.

[@NickPhilly215]

Bypass valve works to achieve the differential pressure, but adjusted to its desired command and still the dp is not met, (dp is still low) then the pump will speed up and increase dp

[@rajakumar-jy6cq]

Could u explain more about decoupler valve in primary and secondary chilled water system

[@fotomacchina6372]

The decoupler is a section of pipe that connects the primary and secondary flow sections. The flow direction can be either way, depending upon the mismatch between primary flow load and system load requirements. i.e. If a chiller is running at MIN. flow under low load and this exceeds the system load, the decoupler will have flow and the mixed flow (return CHW plus the excess portion of primary flow) will enter the chiller.

[@NeerajKumar-zf2yb]

Primary pump and motorized values both should modulate or primary pumps should very with reference to DPT and bypass valve remain on or off as per load demand, please advise

[@ErAbubakerkhan]

I believe the flow meter should be before the bypass line in the variable primary flow circuit diagram.