![]() ![]() Study 3: 68.6% of the load is cooled by liquid with 31.4% cooled by air.Chilled water temperature is raised to 18 C (64.4 F), supply air temperature is maintained at 25 C (77 F), and secondary inlet temperature is maintained at 32 C (89.6 F). Study 2: 61.4% of the load is cooled by liquid with 38.6% cooled by air. ![]() Study 1: 100% air cooling with a chilled water temperature of 7.2 degrees Celsius (45 Fahrenheit), supply air temperature of 25 C (77 F), and secondary inlet temperature of 32 C (89.6 F).We then ran four studies, increasing the percent of liquid cooling in each study while also implementing optimizations to chilled water temperature, supply air temperature, and secondary inlet temperature enabled by the use of liquid cooling. The analysis employed a “bottom up” approach by disaggregating the IT load into subsystems that enabled the impact of a progressive increase in the percent of the load cooled by liquid to be accurately calculated for each subsystem. Schematic of data center used for the energy analysis featuring the Vertiv™ Liebert® XDU and Vertiv™ Liebert® PCW. Liquid cooling is enabled by direct-to-chip cooling through micro channel cold plates mounted on major heat-generating IT components and supported by two Vertiv™ Liebert® XDU coolant distribution units (CDUs) with liquid-to-liquid heat exchangers. The cooling units are supported by a Vertiv™ Liebert® AFC chiller with free cooling, adiabatic free cooling, hybrid cooling, and adiabatic mechanical cooling capabilities. ![]() The baseline for the analysis was 100% air cooling provided by two chilled water, perimeter computer room air handler (CRAH) units with hot-aisle containment. The facility houses 50 high-density racks arranged in two rows. Methodology for the Data Center Liquid Cooling Energy Efficiency Analysisįor our analysis, we chose a midsize (1-2 megawatt), Tier 2 data center in Baltimore, Maryland. This post summarizes the methodology, results, and key takeaways from that analysis. The full analysis was published by the American Society of Mechanical Engineers (ASME) in the paper, Power Usage Effectiveness Analysis of a High-Density Air-Liquid Hybrid Cooled Data Center. To fill that void, a team of specialists from NVIDIA and Vertiv conducted the first major analysis of the impact of liquid cooling on data center PUE and energy consumption. Yet, data center designers and operators have lacked data that could be used to project the impact of liquid cooling on data center efficiency and help them optimize the deployment of liquid cooling for energy efficiency. Adoption of data center liquid cooling continues to gain momentum based on its ability to deliver more efficient and effective cooling of high-density IT racks. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |