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OCP Cold Plate Work Session

Learn about cold plate technology requirements and liquid cooling classifications for IT equipment racks. Understand cooling loop systems, safety standards, and performance metrics. Expert authors guide you through essential information.

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OCP Cold Plate Work Session

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  1. OCP Cold Plate Work Session Jessica Gullbrand Cold Plate Work Stream Lead Advanced Cooling Solutions

  2. ACS Cold Plate Focus Focus group working on ACS Cold Plate Requirements • Technology Cooling System (TCS) fluid loop - Cooling loop from CDU through rack manifold and IT equipment and back • Provide information/education, classification, and minimal requirement for OCP • Authors: - Jessica Gullbrand, Intel - Nigel Gore, Iceotope - Elizabeth Langer, CPC https://docs.google.com/document/d/1f7supR2NAMiCMZVeT9mmS4-DogFta-cG_He8HRBWsM8/edit

  3. ACS Cold Plate Requirements Focus Technology Cooling System (TCS) Examples In-Rack CDU Row Level CDU Virtual CDU Use the Facility Cooling Liquid in TCS loop Figure by Intel, C. Winkel

  4. ACS Cold Plate Definition Hybrid Cooling – both liquid and air cooling • IT Equipment/Rack (with or without rear-door heat exchanger, RDHX) Full Liquid Cooling – all heat is rejected to liquid • Rack/IT Equipment (with or without RDHX)

  5. ACS Cold Plate Definition Cold Plates – Heat exchangers or heat sinks with internal tubing or channels to allow cooling liquid to flow through Coolant Distribution Unit (CDU) – Circulates the cooling liquid to the IT equipment and transfer the heat to the facility cooling liquid Rack Manifold – Distributes cooling liquid within the rack Quick Disconnect Couplings – Disconnects the IT equipment or its components from the TCS loop for serviceability

  6. Cooling Liquid Considerations Cooling Liquids Included (Single- and Two-Phase Liquids): • Water with additives • Glycol based liquids • Dielectric liquids • Refrigerants Material compatibility required between wetted materials and cooling liquid What cooling liquids are covered/considered in DCF?

  7. Liquid Cooling Requirements Pressure Safety Requirements • The liquid cooling loop, its ingredients, and connections must be tested to the highest pressure of the safety standards: • The IEC 60950-1 For EU and US, this standard is outgoing and is expected to be withdrawn on December 20, 2020 in favor of the IEC 62368-1 standard. • The IEC 62368-1 is the new safety standardrequiring leak tests at 3x under normal operating pressure and 2x under abnormal and single fault conditions • ASME B31.3 “Process Piping” (2018) requires leak test at the 1.5x design pressurefor interconnecting piping • What pressure requirements are being considered by DCF? • Standards valid on facility level? On TCS level?

  8. Liquid Cooling Classifications IT Equipment Classifications • Hybrid Basic: CPU/GPU cold plates • Hybrid Intermediate: CPU/GPU & DIMMs cold plates • Hybrid Advanced: CPU/GPU & DIMMs & Additional (specify) cold plates • Full Liquid: cold plates on nearly all components

  9. Liquid Cooling Classifications Liquid Rack Classifications • Hybrid Liquid Cooled Ready Rack without RDHX* • Hybrid Liquid Cooled Ready Rack with RDHX* • Full Liquid Rack Cooling without RDHX* • Full Liquid Rack Cooling with RDHX* *RDHX = Read-Door Heat Exchanger

  10. Performance Metric

  11. Performance Metric PUE versus TUE for liquid cooling PUE = Power usage effectiveness TUE = Total PUE, “PUE” type metric ITUE = PUE for the IT equipment

  12. Performance Metric https://eehpcwg.llnl.gov/assets/as_tue_a_new_look_at_pue.pdf

  13. Performance Metric

  14. Performance Metric

  15. Performance Metric

  16. Performance Metric g i

  17. Performance Metric

  18. Performance Metric

  19. Future Topics of Importance • Manifold Design • Connector Specification • Leakage Detection & Mitigation • Performance Metrics • Testing/Metrology/Requirements

  20. Backup

  21. ACS Cold Plate Purpose Purpose: Generate an open specification and supporting documents focusing on standardization and definitions of liquid cooled solutions without preventing innovation Note: Cold Plate work stream is focusing on liquid cooled solutions using cold plates

  22. Liquid Cooling Requirements Certification Markings • Each liquid cooled technology needs to comply with all certification regulations, which are valid for the geographic location where the liquid cooled system is used. Different regions have different requirements. • Examples: • UL and FCC markings in the US • CE certification in Europe

  23. Cooling Liquid Considerations Water with Additives

  24. Cooling Liquid Considerations Glycol Based Liquids

  25. Cooling Liquid Considerations Dielectric Liquids

  26. Cooling Liquid Considerations Refrigerants

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