Analytical model of data center infrastructure efficiency for system level simulations

2015 ◽  
Author(s):  
Tuomo Malkamäki ◽  
Seppo Ovaska
Keyword(s):  
Analytical Model ◽  
Data Center ◽  
System Level ◽  
System Level Simulations

Influence of Experimental Uncertainty on Prediction of Holistic Multi-Scale Data Center Energy Efficiency

2011 ◽  
Author(s):  
Thomas J. Breen ◽  
Ed J. Walsh ◽  
Jeff Punch ◽  
Amip J. Shah ◽  
Niru Kumari ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Experimental Analysis ◽  
Data Center ◽  
Data Centers ◽  
Operating Conditions ◽  
Coefficient Of Performance ◽  
System Level ◽  
Scale Model ◽  
Multi Scale ◽  
Scale Data

As the energy footprint of data centers continues to increase, models that allow for “what-if” simulations of different data center design and management paradigms will be important. Prior work by the authors has described a multi-scale energy efficiency model that allows for evaluating the coefficient of performance of the data center ensemble (COPGrand), and demonstrated the utility of such a model for purposes of choosing operational set-points and evaluating design trade-offs. However, experimental validation of these models poses a challenge because of the complexity involved with tailoring such a model for implementation to legacy data centers, with shared infrastructure and limited control over IT workload. Further, test facilities with dummy heat loads or artificial racks in lieu of IT equipment generally have limited utility in validating end-to-end models owing to the inability of such loads to mimic phenomena such as fan scalability, etc. In this work, we describe the experimental analysis conducted in a special test chamber and data center facility. The chamber, focusing on system level effects, is loaded with an actual IT rack, and a compressor delivers chilled air to the chamber at a preset temperature. By varying the load in the IT rack as well as the air delivery parameters — such as flow rate, supply temperature, etc. — a setup which simulates the system level of a data center is created. Experimental tests within a live data center facility are also conducted where the operating conditions of the cooling infrastructure are monitored — such as fluid temperatures, flow rates, etc. — and can be analyzed to determine effects such as air flow recirculation, heat exchanger performance, etc. Using the experimental data a multi-scale model configuration emulating the data center can be defined. We compare the results from such experimental analysis to a multi-scale energy efficiency model of the data center, and discuss the accuracies as well as inaccuracies within such a model. Difficulties encountered in the experimental work are discussed. The paper concludes by discussing areas for improvement in such modeling and experimental evaluation. Further validation of the complete multi-scale data center energy model is planned.

Design, modelling and system level simulations of DRIE-based MEMS differential capacitive accelerometer

2019 ◽  
Vol 25 (9) ◽  
pp. 3521-3532 ◽  
Author(s):  
R. Mukhiya ◽  
P. Agarwal ◽  
S. Badjatya ◽  
M. Garg ◽  
P. Gaikwad ◽  
...  
Keyword(s):  
System Level ◽  
Capacitive Accelerometer ◽  
System Level Simulations

Integration of High Speed Train Channel Measurements in System Level Simulations

2019 ◽  
Author(s):  
Martin Klaus Muller ◽  
Tomas Dominguez-Bolano ◽  
Jose A. Garcia-Naya ◽  
Luis Castedo ◽  
Markus Rupp
Keyword(s):  
High Speed ◽  
System Level ◽  
Channel Measurements ◽  
High Speed Train ◽  
System Level Simulations

AN EFFICIENT LOW-POWER SIGMA-DELTA MODULATOR FOR MULTI-STANDARD WIRELESS APPLICATIONS

2012 ◽  
Vol 21 (04) ◽  
pp. 1250028 ◽  
Author(s):  
B. HODA SEYEDHOSSEINZADEH ◽  
MOHAMMAD YAVARI
Keyword(s):  
Low Power ◽  
Power Supply ◽  
Cmos Technology ◽  
System Level ◽  
Sigma Delta Modulator ◽  
Sigma Delta ◽  
Wireless Applications ◽  
Design And Implementation ◽  
Simulation Results ◽  
System Level Simulations

This paper describes the design and implementation of a reconfigurable low-power sigma-delta modulator (SDM) for multi-standard wireless communications in a 90 nm CMOS technology. Both architectural and circuital reconfigurations are used to adapt the performance of the modulator to multi-standard applications. The feasibility of the presented solution is demonstrated using system-level simulations as well as transistor-level simulations of the modulator. HSPICE simulation results show that the proposed modulator achieves 76.8/78.9/80.8/85/89.5 dB peak signal-to-noise plus distortion ratio (SNDR) within the standards WiFi, WiMAX, WCDMA, Bluetooth and GSM with the bandwidth of 12.5 MHz, 10 MHz, 1.92 MHz, 0.5 MHz, and 250 kHz, respectively, under the power consumption of 37/37/12/5/5 mW using a single 1 V power supply.

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