Simulation-Based Assessment of Performance Indicator for Data Center Cooling Optimization

2020 ◽  
Vol 12 (5) ◽  
Author(s):  
John Petrongolo ◽  
Kourosh Nemati ◽  
Kamran Fouladi
Keyword(s):  
Data Center ◽  
Performance Indicator ◽  
The United States ◽  
Energy Usage ◽  
The Past ◽  
Simulation Based ◽  
Data Center Cooling ◽  
States Data ◽  
Power Usage Effectiveness ◽  
Configuration Changes

Abstract Data center power consumption has grown substantially in the past 20 years. According to the United States Data Center Energy Usage Report, the data center consumption in 2014 was estimated at 70 billion kWh, which accounted for 1.8% of the total U.S. electricity. The present effort investigates the effects of various data center parameters on a new set of metrics called the performance indicator to help assess and optimize the cooling performance of data centers. The three metrics in the performance indicator include power usage effectiveness ratio (PUEr), thermal conformance, and thermal resilience. The data center parameters investigated include computer room air handler (CRAH) setpoints, room configuration layouts, and containment strategies. The results show that the CRAH setpoint significantly influences the PUEr with higher setpoint values resulting in lower PUEr values. Room configuration layout changes and containment strategies showed substantial effects on thermal conformance and thermal resilience. The thermal conformance was increased approximately 10% with room configuration changes without changing the PUEr. Full hot aisle containment also improved the thermal conformance by 7.4%.

scholarly journals New Data Center Performance Index: Perfect Design Data Center—PDD

Climate ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 110
Author(s):  
Alexandre F. Santos ◽  
Pedro D. Gaspar ◽  
Heraldo J. L. de Souza
Keyword(s):  
Data Center ◽  
Air Conditioning ◽  
Data Centers ◽  
Current Method ◽  
Energy Usage ◽  
Design Data ◽  
The Difference ◽  
Power Usage Effectiveness ◽  
Approximate Result ◽  
Classification Table

Data Centers (DC) are specific buildings that require large infrastructures to store all the information needed by companies. All data transmitted over the network is stored on CDs. By the end of 2020, Data Centers will grow 53% worldwide. There are methodologies that measure the efficiency of energy consumption. The most used metric is the Power Usage Effectiveness (PUE) index, but it does not fully reflect efficiency. Three DC’s located at the cities of Curitiba, Londrina and Iguaçu Falls (Brazil) with close PUE values, are evaluated in this article using the Energy Usage Effectiveness Design (EUED) index as an alternative to the current method. EUED uses energy as a comparative element in the design phase. Infrastructure consumption is the sum of energy with Heating, Ventilating and Air conditioning (HVAC) equipment, equipment, lighting and others. The EUED values obtained were 1.245 (kWh/yr)/(kWh/yr), 1.313 (kWh/yr)/(kWh/yr) and 1.316 (kWh/yr)/(kWh/yr) to Curitiba, Londrina and Iguaçu Falls, respectively. The difference between the EUED and the PUE Constant External Air Temperature (COA) is 16.87% for Curitiba, 13.33% for Londrina and 13.30% for Iguaçu Falls. The new Perfect Design Data center (PDD) index prioritizes efficiency in increasing order is an easy index to interpret. It is a redefinition of EUED, given by a linear equation, which provides an approximate result and uses a classification table. It is a decision support index for the location of a Data Center in the project phase.

Prevalence of Elder Polyvictimization in the United States: Data From the National Elder Mistreatment Study

2017 ◽  
Vol 35 (21-22) ◽  
pp. 4517-4532 ◽  
Author(s):  
Joah L. Williams ◽  
Elise H. Racette ◽  
Melba A. Hernandez-Tejada ◽  
Ron Acierno
Keyword(s):  
United States ◽  
Older Adults ◽  
Daily Living ◽  
Elder Abuse ◽  
The United States ◽  
Multiple Forms ◽  
Elder Mistreatment ◽  
The Past ◽  
States Data ◽  
Nationally Representative

Elder abuse, including emotional, physical, sexual, financial, and neglectful mistreatment is widespread in the United States, with as much as 11% of community-residing older adults experiencing some form of abuse in the past year. Little data exist regarding the prevalence of polyvictimization, or experience of multiple forms of abuse, which may exacerbate negative outcomes over that of any one form of victimization in isolation. This study evaluates the prevalence of elder polyvictimization among a nationally representative sample of community-residing U.S. older adults. Data from the National Elder Mistreatment Study were examined using bivariate and logistic regression analyses. Approximately, 1.7% of older adults experienced past-year polyvictimization, for which risk factors included problems accomplishing activities of daily living (odds ratio [OR] = 2.47), low social support (OR = 1.64), and past experience of traumatic events (OR = 4.81). Elder polyvictimization is a serious problem affecting community-residing older adults with identifiable targets for intervention.

The Medical Review Panel in Louisiana Neurosurgery and Beyond

Neurosurgery ◽  
2019 ◽  
Vol 85 (6) ◽  
pp. E992-E1001
Author(s):  
Jennifer Kosty ◽  
Bowen Jiang ◽  
Devon C LeFever ◽  
Jared R Brougham ◽  
Frederick White ◽  
...  
Keyword(s):  
United States ◽  
Medical Malpractice ◽  
The United States ◽  
Medical Liability ◽  
Medical Review ◽  
Review Panel ◽  
The Past ◽  
Malpractice Claims ◽  
States Data ◽  
Medical Malpractice Claims

Abstract For the past several decades, medical malpractice claims in the state of Louisiana have been screened by a pretrial medical review panel (MRP). Composed of 3 physicians and 1 attorney, these panels are a method of filtering nonmeritorious lawsuits while expediting creditable claims. Currently, 14 jurisdictions in the United States require medical liability/malpractice cases be heard by an MRP or screening panel prior to trial. In this article, we review the MRP process in Louisiana and compare it to those in other states. Data are presented for the past 10 yr of malpractice claims in Louisiana with an emphasis on the neurosurgery specialty. Finally, the benefits and challenges of pretrial screening panels are discussed.

Data Center Cooling Efficiency With Simulation-Based Optimization

2015 ◽  
Author(s):  
Laurent M. Billet ◽  
Christopher M. Healey ◽  
James W. VanGilder ◽  
Zachary M. Pardey
Keyword(s):  
Energy Consumption ◽  
Data Center ◽  
Data Centers ◽  
Real Life ◽  
Economic Importance ◽  
Cooling Efficiency ◽  
Simulation Based ◽  
Data Center Cooling ◽  
Efficient Control

The efficient control of cooling for data centers is an issue of broad economic importance due to the significant energy consumption of data centers. Many solutions attempt to optimize the control of the cooling equipment with temperature, pressure, or airflow sensors. We propose a simulation-based approach to optimize the cooling energy consumption and show how this approach can be implemented with simple power-consumption models. We also provide a real-life case study to demonstrate how energy saving cooling setpoints can be found using calibrated simulations and smooth metamodels of the system.

scholarly journals United States Data Center Energy Usage Report

2016 ◽  
Author(s):  
Arman Shehabi ◽  
Sarah Smith ◽  
Dale Sartor ◽  
Richard Brown ◽  
Magnus Herrlin ◽  
...  
Keyword(s):  
United States ◽  
Data Center ◽  
Energy Usage ◽  
States Data

International Research and Variation in Views of Ethnicity

2012 ◽  
Vol 2 (2) ◽  
pp. 66-72
Author(s):  
Ella Inglebret ◽  
Amy Skinder-Meredith ◽  
Shana Bailey ◽  
Carla Jones ◽  
Ashley France
Keyword(s):  
United States ◽  
Classification System ◽  
International Research ◽  
The United States ◽  
Research Articles ◽  
Journal Articles ◽  
Research Participants ◽  
The Past ◽  
International Scale ◽  
Publication Patterns

The authors in this article first identify the extent to which research articles published in three American Speech-Language-Hearing Association (ASHA) journals included participants, age birth to 18 years, from international backgrounds (i.e., residence outside of the United States), and go on to describe associated publication patterns over the past 12 years. These patterns then provide a context for examining variation in the conceptualization of ethnicity on an international scale. Further, the authors examine terminology and categories used by 11 countries where research participants resided. Each country uses a unique classification system. Thus, it can be expected that descriptions of the ethnic characteristics of international participants involved in research published in ASHA journal articles will widely vary.

Proportion of Individuals With Past-Year Suicidal Ideation Who Attempted Suicide Over the Past 10 Years in the United States, and the Influence of Age and Sex

Crisis ◽  
2020 ◽  
pp. 1-5
Author(s):  
Shannon Lange ◽  
Courtney Bagge ◽  
Charlotte Probst ◽  
Jürgen Rehm
Keyword(s):  
United States ◽  
Suicidal Ideation ◽  
Random Effects ◽  
Attempted Suicide ◽  
Suicide Attempts ◽  
The United States ◽  
Individual Level ◽  
The Past ◽  
Meta Analyses ◽  
Age Category

Abstract. Background: In recent years, the rate of death by suicide has been increasing disproportionately among females and young adults in the United States. Presumably this trend has been mirrored by the proportion of individuals with suicidal ideation who attempted suicide. Aim: We aimed to investigate whether the proportion of individuals in the United States with suicidal ideation who attempted suicide differed by age and/or sex, and whether this proportion has increased over time. Method: Individual-level data from the National Survey on Drug Use and Health (NSDUH), 2008–2017, were used to estimate the year-, age category-, and sex-specific proportion of individuals with past-year suicidal ideation who attempted suicide. We then determined whether this proportion differed by age category, sex, and across years using random-effects meta-regression. Overall, age category- and sex-specific proportions across survey years were estimated using random-effects meta-analyses. Results: Although the proportion was found to be significantly higher among females and those aged 18–25 years, it had not significantly increased over the past 10 years. Limitations: Data were self-reported and restricted to past-year suicidal ideation and suicide attempts. Conclusion: The increase in the death by suicide rate in the United States over the past 10 years was not mirrored by the proportion of individuals with past-year suicidal ideation who attempted suicide during this period.

EDITORIAL: Migration and competitiveness: Japan and the United States

2013 ◽  
Vol 10 (2) ◽  
pp. 115-124
Author(s):  
Philip L. Martin
Keyword(s):  
United States ◽  
The United States ◽  
Variable Cost ◽  
Fixed Cost ◽  
Special Issue ◽  
Science And Engineering ◽  
The Past ◽  
Past Half Century ◽  
Key Sectors ◽  
Past Half

Japan and the United States, the world’s largest economies for most of the past half century, have very different immigration policies. Japan is the G7 economy most closed to immigrants, while the United States is the large economy most open to immigrants. Both Japan and the United States are debating how immigrants are and can con-tribute to the competitiveness of their economies in the 21st centuries. The papers in this special issue review the employment of and impacts of immigrants in some of the key sectors of the Japanese and US economies, including agriculture, health care, science and engineering, and construction and manufacturing. For example, in Japanese agriculture migrant trainees are a fixed cost to farmers during the three years they are in Japan, while US farmers who hire mostly unauthorized migrants hire and lay off workers as needed, making labour a variable cost.

THE ENERGY EFFICIENCY ANALYSIS OF DATA CENTER COOLING BASED ON SEPARATED HEAT PIPE

2018 ◽  
Author(s):  
Tao Wang ◽  
Yuhua Li ◽  
Huan Liu ◽  
Lei Zhang ◽  
Yuyan Jiang ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Heat Pipe ◽  
Data Center ◽  
Efficiency Analysis ◽  
Data Center Cooling ◽  
Energy Efficiency Analysis
Sign in / Sign up

Export Citation Format

Share Document