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To meet the high cooling demand in the electronics industry, enhanced microchannel heat sinks were introduced. However, the intricacies and high costs associated with microfabrication technologies prove them unsuitable for application in conventional heat exchangers. Hence, the motivation to implement microscale passages in macro geometries ensues. In this study, the annular microchannel is formed...
This paper presents numerical simulations based on the concept of local and global dimensional analysis to reproduce the thermodynamics and aerodynamics of server-fins, i.e., detachable flat/curved fins on the inlet/outlet of a server, for enhancing energy efficiency in data centers. Server-fin designs, combinations of shapes and opening angles, are evaluated by transient analysis, vorticity analysis,...
To keep up with the growing energy demand, legacy aircooled data centers have begun to implement simple but effective energy efficiency strategies or best practices. Improving “air management”, optimizing the delivery of cool air and the collection of waste heat, are among these efficiency strategies. One of the most powerful tools for identifying energy wasteful practices is the application of the...
Concerted efforts are being made by data center professionals to ensure that data centers are made more sustainable by reducing energy consumption. The combination of increasing IT workloads and packaging densities place stringent requirements on data center cooling systems. Various traditional airflow management technologies have been implemented that propose significant energy savings as well as...
Electric-drive systems, which include electric machines and power electronics, are a key enabling technology to meet increasing automotive fuel economy standards, improve energy security, address environmental concerns, and support economic development. Enabling cost-effective electric-drive systems requires reductions in inverter power semiconductor area, which increases challenges associated with...
A model for a basic hot aisle/cold aisle data center configuration was built and analyzed using the commercial computational fluid dynamics (CFD) software FloTHERM. The CFD study was motivated by experimental data that sho wed air recirculatio n from the hot aisle to the cold aisle through the gap between the floor and the bottom of the server cabinet. This flow can be attributed to lower values of...
Under a given set of boundary conditions, thermal performance of an electronic system is generally evaluated based on its steady state response. It is a conventional practice that actual time dependent power cycles and thermal boundary conditions are time-averaged to estimate the steady state characteristics. This approach may produce accurate results provided that the time dependency of the power...
In an effort to improve the reliability and efficiency of data centers, racks and sometimes entire hot aisles are ducted to a dropped ceiling. The cooling performance of such systems strongly depends on IT and cooler airflow, the number and configuration of ducted objects and perforated ceiling tiles, the leakiness of the ceiling system, ceiling plenum depth, and other factors. Recently, a compact...
The purpose of under floor plenum in a typical raised floor data center is to route the supply of cold air to perforated tiles in the cold aisles, and hence, to the racks. However, the presence of under floor chiller piping and various wiring may have an adverse effect on flow rates if not placed based on physical considerations; the pressure drop caused by chiller piping and under floor blockages...
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