Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
Performance growth in high power electronics has hit a thermal barrier. High total power dissipation requirements and the presence of localized hot spots are causing chips to exceed safe junction temperature limits, and thermally aware chip package design is crucial for ensuring reliable device operation. In this paper, an analytical model is developed as an early stage design tool to predict the...
The paper summarizes part of a project that was undertaken to develop highly energy efficient warm liquid cooled servers for use in chiller-less data centers that could save significant data center energy use and reduce data center refrigerant and make up water usage. One of the key concepts developed as part of this project is the Dual-Enclosure-Liquid-Cooling (DELC), which comprises of a 100% liquid...
This paper focuses on alternative highly energy-efficient data center configurations with air-cooled servers that eliminate the use of chillers. In the first method, outdoor air is directly pumped through one side of an indirect air-to-air heat exchanger with air flow through the other side being passed through the data center to cool the air-cooled server racks. This method is called Indirect Air...
There is strong interest in being able to predict the air thermal distribution in data centers to have a better understanding of the problem so that cooling energy can be reduced. As experimental studies in data centers require exhaustive measurement efforts, CFD presents an alternative solution. A few of these studies were validated against experimental data, and relatively large errors were found...
Typical data centers utilize approximately 50% of the total IT energy in cooling of the server racks. We present a chillerless data center where server-level cooling is achieved through a combination of warm water cooling hardware and re-circulated air; eventual heat rejection to ambient air is achieved using a closed secondary liquid loop to ambient-air heat exchanger (dry-cooler). Several experiments...
This paper summarizes the concept design and hardware build efforts as part of a US Department of Energy cost shared grant, two year project (2010–2012) that was undertaken to develop highly energy efficient, warm liquid cooled servers for use in chiller-less data centers. Significant savings are expected in data center energy, refrigerant and make up water use. The technologies being developed include...
Understanding and improving the thermal management and energy efficiency of data center cooling systems is of growing importance from a cost and sustainability perspective. Toward this goal, warm liquid cooled servers were developed to enable highly energy efficient chiller-less data centers that utilize only “free” ambient environment cooling. This approach greatly reduces cooling energy use, and...
With the ever increasing heat loads dissipated by computer hardware, the ability to accurately characterize the cooling requirements in data centers is becoming crucial. Computational fluid dynamics modeling has proven in many cases to be adequate in providing a general understanding of the thermal environment in data centers. However, almost all analyses of data centers to this day are conducted...
An improved CFD model is presented to predict the thermal field in a small data center test cell. CFD analysis reported in an earlier paper tended to exaggerate hot and cold spots in a small data center test cell as a result of the inability of the CFD model to predict the correct level of mixing of the cold air emanating from the perforated floor tiles and the warmer room air. The same can be said...
Two-phase pumped-loop systems are being actively considered for cooling of high heat load electronics. In the present study, a computational method based on a two-level approach is developed for generalized system-level analysis of two-phase pumped-loop cooling systems containing multiple branches under steady-state conditions. Detailed one-dimensional analysis of components with distributed two-phase...
Information Technology data centers consume a large amount of electricity in the US and world-wide. Cooling has been found to contribute about one third of this energy use. The two primary contributors to the data center cooling energy use are the refrigeration chiller and the Computer Room Air Conditioning units (CRACs). There have been recent changes in specifications for the data center environmental...
Current CFD simulation studies of large data centers cannot model the detailed geometries of the perforated tiles due to grid size limitation. These studies often assume that the tile flow can be modeled as constant velocity based on a fully open tile. In this case, mass flux is enforced at the expense of under-predicting momentum flux; the error in momentum flux can be as high as a factor of four...
The design and use of heat sinks, which are compatible with sustainable development, involves a subtle balance between a superior thermal design, minimum material consumption, and minimum pumping power. Due to the rapid proliferation of electronic systems, substantial material streams, energy consumption, and entropy generation rates are associated with the cooling of computers, as well as other categories...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.