Data Center CDU cooling loop control

Equilibar back pressure regulators can be used to control dP across the supply and return lines in data center CDU cooling operations. https://www.equilibar.com/contact/

Liquid distribution headers feed supply and return lines that distribute fluid to servers in parallel.
- Controlling dP across the supply and return creates uniform flow across each parallel leg of similar construction.
- Uniform flow enables uniform heat transfer, which is essential in data centers to avoid dew-point condensation, circulating unnecessary flow, and thermal stress on the server tray (solder joints, CPU temperature, etc.).
- As demand fluctuates, data centers aim to circulate only the necessary amount of fluid, establishing a demand relationship between the dP control device and load.

Equilibar back pressure regulators (BPRs) are versatile and can be used in either installation configuration for CDU flow control:
- Supply installation: controls server rack dP at the supply point.
- Return installation: controls server rack dP at the exit stream.

This video shows the control behavior of the Equilibar BPRs in both scenarios. Equilibar engineers set up a lab demonstration using both installations to compare the two options. For each setup there are three valves in parallel acting like heat sinks in place of a server tray. Valves were opened and closed to simulate server trays coming on and off line. As the demand on the CDU changed , the dP across the server trays also changed.

When controlling dP from the supply line, the Equilibar back pressure regulator takes a few seconds to bring the dP back under control after change in demand.

When controlling dP from the return line, the Equilibar BPR responded instantaneously and maintained the dP setpoint on target throughout any load changes.

Our recommendation would be to set up a system similar to scenario B, using the exit-stream for the BPR installation point. If system limitations prevent that, upstream installation can still achieve good control.

In either configuration, the system energy impact remains the same—the Equilibar valve authority is low, so its contribution to overall system dP is minimal. Using an Equilibar BPR in this application results in minimal system energy consumption. Contact us for more information https://www.equilibar.com/contact/

Видео Data Center CDU cooling loop control канала Equilibar - Precision Fluid Control