Computer Room Air Conditioning Considering Radiation and Dust Particles (DPM) ANSYS Fluent CFD Simulation Tutorial

The present problem simulates air conditioning in an office with several computers and simulators using ANSYS Fluent software. The air conditioning system in the current model is of floor heating and ceiling cooling. In these systems, the buoyancy effect causes free heat transfer inside the office space.

Due to the lightness, the hot air moves from the floor to the ceiling, and the cold air does the opposite, thus creating a circulating flow that causes the air conditioning process.

In this modeling, airflow enters the office from circular sections with a speed of 0.6125 m/s and a temperature of 291.1 K. It exits through rectangular sections on the office roof with a pressure equal to atmospheric pressure.

We design the present model in three dimensions using Design Modeler software. The model's geometry includes an office desk measuring 6.35 m and 5.4 m at floor level and 2.7 m high. In the office, 4 computer cases and 4 simulators are located as heat sources. There are also sections such as air inlets and outlets on the floor and ceiling of the office.

We have meshed the model using ANSYS Meshing software, and the mesh type is unstructured. The element number is 3089035.

Air Conditioning Methodology

In this model, we define the Radiation model due to the radiant heat transfer between the surfaces inside the office. Also, we define particles using the DPM in inlet sections to study the behavior of airflow and the type of circulation inside the interior of the office.

Inside the office, there are 4 computer cases and 4 simulators. Due to their function, they generate a certain amount of heat and transfer it to the office's interior. Four case devices have a heat flux boundary condition of 152.5 W/m2. Also, 4 simulators have a heat flux boundary condition of 90.56 W/m2.

Air Conditioning Conclusion

At the end of the solution process, two-dimensional and three-dimensional contours related to pressure, velocity, temperature, and three-dimensional velocity vectors are obtained. By examining these particles' behavior and type of displacement, the flow of airflow can be analyzed.