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11 Jan 2023

External CFD Analysis for Data Center Building

MECHARTES Hall: N4-N13 Stand: D375
External CFD Analysis for Data Center Building
External CFD Analysis for Data Center Building

Objective:

The main objective of the CFD analysis for the Project owners/contractors/design consultants is to check the following:

i. To determine if "hot air rejected from chiller units & generators" enters the inlets of chiller units & generators, and if so, what is the increase in temperature due to re-circulation of air.

ii. To determine if the chiller units are receiving proper air circulation.

iii. To study the velocity & temperature profiles around the chillers units & generator sets.

iv. Re-circulation calculation for each equipment.

v. Assessing the impact of NO2 emissions from the generator exhaust on adjacent residential buildings and determining whether the concentrations of NO2 are within the acceptable limit of 0.2 ppm (400 mg/Nm3 for 1 hour of exposure).

In addition, we ran CFD simulations under different wind and ambient conditions.

Modelling:

Per the inputs and design drawings received, we prepared a detailed 3D model of the complete in the CFD Software.

A CFD Wind tunnel is created by modelling the nearby buildings. In the data center building all the obstructions including the major pipes, wall obstructions, equipment's were also modelled. Chillers, mechanical units, generators, and air intake louvers were modeled in detail .

Appropriate boundary conditions, including the intake, discharge temperature and velocity from all the equipment, were considered for the study. The wind and ambient conditions were chosen for the work per the project requirement and site location.

Conclusion:

Upon completion and approval of the 3D model, a steady-state CFD Simulation was performed to study the velocity, temperature and re-circulation on each piece of equipment.

It was observed from the study that there was a considerable increase in temperature at the inlets of the chillers and other mechanical units, which had an impact on the performance. The recirculation calculations found that nearly 5 to 50% of air recirculated. This was mainly due to the movement of hot air from the generator and the chiller outlets towards the inlets of the chiller units.

It was also observed from the CFD results that the NO2 emission from generator exhaust affected the Data Center building premises and high-rise buildings, and the NO2 levels were higher than the acceptable limits.

Recommendation:

In order to prevent the effect of high-temperature generator discharge air moving toward the inlets of generators, chillers, and other equipment, revised CFD studies were conducted with the installation of vertical ducts to leave the discharge & exhaust air at a higher level from the ground.

To prevent hot air emitted from the chiller discharge from returning to their inlets of the chiller and reduce recirculation, canopies were constructed between them.

We at Mechartés focus on providing accurate simulation results with a professional engineering approach. Our biggest strength is our team of young, passionate engineers who work as a close-knit team.

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