Efficient Operation of Indirect Evaporative Data Center Cooling Systems via Newton-Like Extremum-Seeking Control

Author(s):  
Alessandro Beghi ◽  
Michele Lionello ◽  
Mirco Rampazzo
2020 ◽  
Vol 53 (2) ◽  
pp. 1614-1620
Author(s):  
Fabiana Federica Ferro ◽  
Michele Lionello ◽  
Mirco Rampazzo ◽  
Alessandro Beghi ◽  
Martin Guay

2017 ◽  
Vol 50 (1) ◽  
pp. 5133-5138
Author(s):  
Fernando Lizarralde ◽  
João C. Monteiro ◽  
Rafael Pereira ◽  
Liu Hsu

Author(s):  
Madhusudan Iyengar ◽  
Roger R. Schmidt

The increasingly ubiquitous nature of computer and internet usage in our society, has driven advances in semiconductor technology, server packaging, and cluster level optimizations, in the IT industry. Not surprisingly this has an impact on our societal infrastructure with respect to providing the requisite energy to fuel these power hungry machines. Cooling has been found to contribute to about a third of the total data center energy consumption, and is the focus of this study. In this paper we develop and present physics based models to allow the prediction of the energy consumption and heat transfer phenomenon in a data center. These models allow the estimation of the microprocessor junction and server inlet air temperatures for different flow and temperature conditions at various parts of the data center cooling infrastructure. For a case study example considered, the chiller energy use was the biggest fraction of about 41% and also the most inefficient. The room air conditioning was the second largest energy component and also the second most inefficient. A sensitivity analysis of plant and chiller energy efficiency with chiller set point temperature and outdoor air conditions is also presented.


2021 ◽  
Vol 150 ◽  
pp. 111389
Author(s):  
Tao Ding ◽  
Xiaoxuan Chen ◽  
Hanwen Cao ◽  
Zhiguang He ◽  
Jianmin Wang ◽  
...  

Author(s):  
Baojie Mu ◽  
Yaoyu Li ◽  
John E. Seem ◽  
Bin Hu

This paper presents a multivariable Newton-based extremum seeking control (ESC) scheme for efficient operation of a chilled-water plant. A modelica-based dynamic simulation model of the chilled-water plant consists of one screw chiller and one counter-flow cooling tower was adopted for evaluation of proposed two-input Newton-based ESC controller. The ESC controller takes the total power of the chiller compressor, the cooling-tower fan, and the condenser water (CW) pump as feedback signal and discovers the optimum outputs of cooling-tower fan speed and the condenser-loop water flow rate to maximize the power efficiency in real time with the cooling load being satisfied. Remarkable energy saving is observed for several testing conditions.


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