ATTACHMENT 12 - CFD Analysis Report.pdf
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- Attached to
- Y1DA--EHRM Infrastructure Upgrades Construction San Juan Federal contract opportunity
- Solicitation number
- 36C77624B0012
About this file
This document is a Computational Fluid Dynamics (CFD) airflow analysis report for the data room at the San Juan, Puerto Rico Office of Construction and Facilities Management Center. The analysis was performed to determine the airflow and heat transfer patterns in the data room, which houses 20 servers of 3.5 kW and 4 servers of 0 kW. The analysis considered five different simulation scenarios with one of the four N+1 computer room air conditioning (CRAC) units turned off, while the other three units operated to provide the necessary 38,400 CFM of supply air. The report includes temperature profiles, velocity vectors, and average inlet/outlet temperatures for each scenario. The key findings indicate that the data room can be adequately cooled with three of the four CRAC units operating, and provide detailed information on the expected temperature and airflow conditions.
The related federal contract opportunity is Solicitation Number 36C77624B0012 for the EHRM Infrastructure Upgrades Construction project in San Juan. The scope of work includes general construction, infrastructure upgrades, and reconfiguration/renovation of various buildings, with a focus on electrical, HVAC, communications, physical security, and fiber infrastructure improvements. The project is being procured by the Department of Veterans Affairs Technology Acquisition Center Austin.
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Text version
AIRFLOW ANALYSIS
San Juan VA EHRM
IMEG #21006666
Airflow Analysis for
EHRM Infrastructure Upgrade San Juan, Puerto Rico
A. SUMMARY
This document presents the results of the airflow study performed for the Data Room located at the Office of Construction and Facilities Management Center located in San Juan, Puerto Rico.
The study aims to recreate the initial conditions of the spaces. The airflow analysis was performed using a computational fluid dynamics (CFD) software which determines the airflow and heat transfer patterns using fluid flow and heat transfer mathematical equations.
B. SPACE DESCRIPTION – DATA ROOM
The Data Room is a data center that houses 20 servers of 3.5 kW and 4 servers of 0 kW arranged in a single aisle. The space is served by four (4) computer room air conditioning units, CRAC -1, - 2, -3, & -4. The units have a downflow configuration having ducted top return and front discharge.
At normal operating mode each CRAC unit supplies 9600 cfm resulting in a total supply of 38,400 CFM into the room. For N+1 operating mode, each CRAC unit supplies 12,800 CFM for a total of
38,400 CFM.
Figure 1: Room Layout
Figure 1 above shows the room layout and server location (marked in red) and location of CRAC units.
C R
AC
C R
AC
C R
AC
C R
AC
Closed Aisle
UPS Room
UPS Room
Servers Servers
CFD Airflow Analysis for VA EHRM Infrastructure Upgrade, San Juan, Puerto Rico
IMEG #21006666
September 15th,2023
C. ASSUMPTIONS – DATA ROOM
Server loads were determined based on the server types and calculated loads. Assumptions were made for server loads whose data was unavailable. The severs internal airflow was estimated based on load and industry standards and was assumed to be 800 CFM through each server.
Figure 2: Simulation Model
Servers
Top Return
IMEG #21006666
September 15th,2023
D. SIMULATION SCENARIOS
The airflow analysis consists of five (5) different simulation scenarios of functioning of CRAC Units.
In these analyses, one of the four N+1 CRAC units is turned off, with the other three units operating to provide the necessary amount of supply air (Total of 38,400 CFM). In regular operation, all four CRAC units would be operating to supply total of 38,400 CFM.
Scenario Supply
Temperature Supply CFM (Each Unit)
CRAC Function ON CRAC Function OFF
Scenario 1 74°F 9,600 CRAC Unit 1,2,3,4 ON -
Scenario 2 74°F 12,800 CRAC 2,3,4 CRAC 1
Scenario 3 74°F 12,800 CRAC 1,3,4 CRAC 2
Scenario 4 74°F 12,800 CRAC 1,2,4 CRAC 3
Scenario 5 74°F 12,800 CRAC 1,2,3 CRAC 4
Figure 3: CRAC Units nomenclature for Design Iteration
CRAC 2
CRAC 1
CRAC 4
CRAC 3
IMEG #21006666
September 15th,2023
E. SIMULATION RESULTS: SCENARIO 1: All CRAC Units ON
Scenario Supply
Temperature Supply CFM (Each Unit)
CRAC Function ON CRAC Function
OFF
Scenario 1 74°F 9,600 CRAC Unit 1,2,3,4 ON -
Figure 4: Temperature Profile and velocity vectors at 4ft height
IMEG #21006666
September 15th,2023
Figure 5: Return Air temperature profile at CRAC return.
Figure 6: Temperature Profile and velocity vectors through servers
Average Inlet Temperature Average Outlet Temperature Average Temp. at 4ft Plane
76.0°F 87.4°F 79.4°F
IMEG #21006666
September 15th,2023
F. SIMULATION RESULTS: SCENARIO 2:
Scenario Supply
Temperature Supply CFM (Each Unit)
CRAC Function ON CRAC Function
OFF
Scenario 2 74°F 12,800 CRAC Unit 2,3,4 ON CRAC Unit 1 Off
Figure 7: Temperature Profile and velocity vectors at 4ft height
IMEG #21006666
September 15th,2023
Figure 8: Return Air temperature profile at CRAC return.
Figure 9: Temperature Profile and velocity vectors through servers
76.7°F 87.4°F 79.3°F
IMEG #21006666
September 15th,2023
G. SIMULATION RESULTS: SCENARIO 3:
Scenario Supply
Temperature Supply CFM (Each Unit)
CRAC Function ON CRAC Function
OFF
Scenario 3 74°F 12,800 CRAC Unit 1,3,4 ON CRAC Unit 2 Off
Figure 10: Temperature Profile and velocity vectors at 4ft height
IMEG #21006666
September 15th,2023
Figure 11: Return Air temperature profile at CRAC return.
Figure 12: Temperature Profile and velocity vectors through servers
76.6°F 87.1°F 78.2°F
IMEG #21006666
September 15th,2023
H. SIMULATION RESULTS: SCENARIO 4:
Scenario Supply
Temperature Supply CFM (Each Unit)
CRAC Function ON CRAC Function
OFF
Scenario 4 74°F 12,800 CRAC Unit 1,2,4 ON CRAC Unit 3 Off
Figure 13: Temperature Profile and velocity vectors at 4ft height
IMEG #21006666
September 15th,2023
Figure 14: Return Air temperature profile at CRAC return.
Figure 15: Temperature Profile and velocity vectors through servers
76.0°F 87.4°F 79.8°F
IMEG #21006666
September 15th,2023
I. SIMULATION RESULTS: SCENARIO 5:
Scenario Supply
Temperature Supply CFM (Each Unit)
CRAC Function ON CRAC Function
OFF
Scenario 5 74°F 12,800 CRAC Unit 1,2,3 ON CRAC Unit 4 Off
Figure 16: Temperature Profile and velocity vectors at 4ft height
IMEG #21006666
September 15th,2023
Figure 17: Return Air temperature profile at CRAC return.
Figure 18: Temperature Profile and velocity vectors through servers
76.1°F 87.5°F 79.3°F
IMEG #21006666
September 15th,2023
J. RACK TEMPERATURE COMPARATIVE:
Row 1 Row 2Scenario Tin Average Tout Average Tin Average Tout Average
Scenario 1 75.8 87.4 76.2 87.3
Scenario 2 76.7 87.7 76.8 86.9
Scenario 3 76.6 87.5 76.7 86.9
Scenario 4 76.5 87.2 75.6 87.6
Scenario 5 76.5 87.4 75.7 87.7
K. AVERAGE TEMPERATURE AT 4’ HEIGHT PLANE
Scenario Average Temperature Scenario 1 79.4 Scenario 2 79.3 Scenario 3 78.2 Scenario 4 79.8 Scenario 5 79.3
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