Experimental investigation of CRAH bypass for enclosed aisle data centers

Hamza Salih Erden; Mehmet Turgay Yildirim; Mustafa Koz; H. Ezzat Khalifa

doi:10.1109/ITHERM.2016.7517697

Experimental investigation of CRAH bypass for enclosed aisle data centers

Hamza Salih Erden, Mehmet Turgay Yildirim, Mustafa Koz, H. Ezzat Khalifa

Department of Mechanical & Aerospace Engineering

Research output: Chapter in Book/Entry/Poem › Conference contribution

10 Scopus citations

Abstract

Aisle containments in data centers help provide uniform server inlet air temperatures. This allows the cooling system to run at a higher evaporator temperature and more efficiently. On the other hand, CRAH units run at higher speeds to ascertain that racks receive sufficient air flow. Since CRAH fan power already constitutes an important component of data center power use, such increases in the fan power can overshadow the energy savings due to more efficient chiller operation. CRAH bypass configuration is proposed to achieve optimum operating condition for enclosed aisle data centers. This configuration utilizes fan-assisted perforated floor tiles to induce a fraction of tile flow from the room through bypass ports or leakage paths and help decreasing the amount of air flow passing through the large flow resistances of CRAH units. Experimental results show that there is an optimum operating condition for the specific data center test cell that is designed to represent an enclosed aisle data center utilizing the proposed CRAH bypass configuration. Here, the flow characteristics of major system components and experimental measurements have been used to calibrate a flow network model (FNM) for the design optimization and trade-off analysis of the proposed system. Calibrated FNM along with a thermodynamic model (TM) of the cooling infrastructure provides an estimate of the energy use at various fractions of CRAH bypass air and chilled water temperatures. This study introduces the design of the experimental setup for testing CRAH bypass configuration for enclosed aisles and for calibrating models to predict the cooling infrastructure energy saving potential of the proposed technique.

Original language	English (US)
Title of host publication	Proceedings of the 15th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2016
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	1293-1299
Number of pages	7
ISBN (Electronic)	9781467381215
DOIs	https://doi.org/10.1109/ITHERM.2016.7517697
State	Published - Jul 20 2016
Event	15th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2016 - Las Vegas, United States Duration: May 31 2016 → Jun 3 2016

Publication series

Name	Proceedings of the 15th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2016

Other

Other	15th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2016
Country/Territory	United States
City	Las Vegas
Period	5/31/16 → 6/3/16

Keywords

Aisle Containment
CRAC/CRAH Bypass
Cooling Infrastructure Power
Experiments
Fan Assisted Tiles
Flow Network Model

ASJC Scopus subject areas

Fluid Flow and Transfer Processes
Electrical and Electronic Engineering
Electronic, Optical and Magnetic Materials
Hardware and Architecture
Mechanics of Materials

Access to Document

10.1109/ITHERM.2016.7517697

Cite this

Erden, H. S., Yildirim, M. T., Koz, M., & Khalifa, H. E. (2016). Experimental investigation of CRAH bypass for enclosed aisle data centers. In Proceedings of the 15th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2016 (pp. 1293-1299). Article 7517697 (Proceedings of the 15th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2016). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ITHERM.2016.7517697

Experimental investigation of CRAH bypass for enclosed aisle data centers. / Erden, Hamza Salih; Yildirim, Mehmet Turgay; Koz, Mustafa et al.
Proceedings of the 15th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2016. Institute of Electrical and Electronics Engineers Inc., 2016. p. 1293-1299 7517697 (Proceedings of the 15th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2016).

Research output: Chapter in Book/Entry/Poem › Conference contribution

Erden, HS, Yildirim, MT, Koz, M & Khalifa, HE 2016, Experimental investigation of CRAH bypass for enclosed aisle data centers. in Proceedings of the 15th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2016., 7517697, Proceedings of the 15th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2016, Institute of Electrical and Electronics Engineers Inc., pp. 1293-1299, 15th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2016, Las Vegas, United States, 5/31/16. https://doi.org/10.1109/ITHERM.2016.7517697

Erden HS, Yildirim MT, Koz M, Khalifa HE. Experimental investigation of CRAH bypass for enclosed aisle data centers. In Proceedings of the 15th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2016. Institute of Electrical and Electronics Engineers Inc. 2016. p. 1293-1299. 7517697. (Proceedings of the 15th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2016). doi: 10.1109/ITHERM.2016.7517697

Erden, Hamza Salih ; Yildirim, Mehmet Turgay ; Koz, Mustafa et al. / Experimental investigation of CRAH bypass for enclosed aisle data centers. Proceedings of the 15th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2016. Institute of Electrical and Electronics Engineers Inc., 2016. pp. 1293-1299 (Proceedings of the 15th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2016).

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abstract = "Aisle containments in data centers help provide uniform server inlet air temperatures. This allows the cooling system to run at a higher evaporator temperature and more efficiently. On the other hand, CRAH units run at higher speeds to ascertain that racks receive sufficient air flow. Since CRAH fan power already constitutes an important component of data center power use, such increases in the fan power can overshadow the energy savings due to more efficient chiller operation. CRAH bypass configuration is proposed to achieve optimum operating condition for enclosed aisle data centers. This configuration utilizes fan-assisted perforated floor tiles to induce a fraction of tile flow from the room through bypass ports or leakage paths and help decreasing the amount of air flow passing through the large flow resistances of CRAH units. Experimental results show that there is an optimum operating condition for the specific data center test cell that is designed to represent an enclosed aisle data center utilizing the proposed CRAH bypass configuration. Here, the flow characteristics of major system components and experimental measurements have been used to calibrate a flow network model (FNM) for the design optimization and trade-off analysis of the proposed system. Calibrated FNM along with a thermodynamic model (TM) of the cooling infrastructure provides an estimate of the energy use at various fractions of CRAH bypass air and chilled water temperatures. This study introduces the design of the experimental setup for testing CRAH bypass configuration for enclosed aisles and for calibrating models to predict the cooling infrastructure energy saving potential of the proposed technique.",

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AB - Aisle containments in data centers help provide uniform server inlet air temperatures. This allows the cooling system to run at a higher evaporator temperature and more efficiently. On the other hand, CRAH units run at higher speeds to ascertain that racks receive sufficient air flow. Since CRAH fan power already constitutes an important component of data center power use, such increases in the fan power can overshadow the energy savings due to more efficient chiller operation. CRAH bypass configuration is proposed to achieve optimum operating condition for enclosed aisle data centers. This configuration utilizes fan-assisted perforated floor tiles to induce a fraction of tile flow from the room through bypass ports or leakage paths and help decreasing the amount of air flow passing through the large flow resistances of CRAH units. Experimental results show that there is an optimum operating condition for the specific data center test cell that is designed to represent an enclosed aisle data center utilizing the proposed CRAH bypass configuration. Here, the flow characteristics of major system components and experimental measurements have been used to calibrate a flow network model (FNM) for the design optimization and trade-off analysis of the proposed system. Calibrated FNM along with a thermodynamic model (TM) of the cooling infrastructure provides an estimate of the energy use at various fractions of CRAH bypass air and chilled water temperatures. This study introduces the design of the experimental setup for testing CRAH bypass configuration for enclosed aisles and for calibrating models to predict the cooling infrastructure energy saving potential of the proposed technique.

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Experimental investigation of CRAH bypass for enclosed aisle data centers

Abstract

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Keywords

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