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Computer Room Air Conditioning, Radiation & DPM, ANSYS Fluent CFD Training

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The present problem simulates the process of air conditioning in an office with several computers and simulators using ANSYS Fluent software.

This product includes Geometry & Mesh file and a comprehensive Training Movie.

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Description

Computer Room Project Description

The present problem simulates the process of 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 this way, the effect of buoyancy 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 model, due to the presence of radiant heat transfer between the surfaces inside the office, the radiation model is defined. Also, to study the behavior of air flow and the type of its circulation inside the interior of the office, particles are defined using the DPM model of inlet sections. Thus, by examining the behavior and type of displacement of these particles, the flow of air flow can be analyzed. In this modeling, air flow enters the office from circular sections as inlet from the office floor with a speed of 0.6125 m.s-1 and a temperature of 291.1 K and exits through rectangular sections on the office roof with a pressure equal to atmospheric pressure.

Inside the office, there are four computer cases and four simulators that, due to their function, generate a certain amount of heat and transfer it to the interior of the office. Four case devices have a heat flux boundary condition of 152.5 W.m-2 and four simulators have a heat flux boundary condition of 90.56 W.m-2.

Computer Room Geometry & Mesh

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

computer room

The meshing of the model has been done using ANSYS Meshing software and the mesh type is unstructured. The element number is 3089035. The following figure shows the mesh.

computer room

Air Conditioning CFD Simulation

To simulate the present model, several assumptions are considered:

  • We perform a pressure-based solver.
  • The simulation is steady.
  • The gravity effect on the fluid is equal to -9.81 m.s-2 along the Y-axis.

The following table represents a summary of the defining steps of the problem and its solution:

Models (computer room)
Viscous k-epsilon
k-epsilon model realizable
near-wall treatment standard wall function
Radiation Model S2S
solar load off
Discrete Phase Model On
interaction with continuous phase active
particle type for injection inert
injection type surface
particles’ diameter 0.000001 m
particles’ temperature 300 K
particles’ velocity 0.6125 m.s-1
particles’ flow rate 0.000004896 kg.s-1
Energy On
Boundary conditions (Air Conditioning)
Inlet Velocity Inlet
velocity magnitude 0.6125 m.s-1
temperature 291.1 K
internal emissivity 1
discrete phase BC type escape
Outlet Pressure Outlet
gauge pessure 0 Pascal
internal emissivity 1
discrete phase BC type escape
Side Walls Wall
wall motion stationary wall
heat flux 0 W.m-2
internal emissivity 1
discrete phase BC type reflect
Heat Wall Wall
wall motion stationary wall
heat flux 193.95 W.m-2
internal emissivity 1
discrete phase BC type reflect
Cases Wall
wall motion stationary wall
heat flux 152.5 W.m-2
internal emissivity 1
discrete phase BC type reflect
Simulators Wall
wall motion stationary wall
heat flux 90.56 W.m-2
internal emissivity 1
discrete phase BC type reflect
Methods (Air Conditioning)
Pressure-velocity coupling SIMPLE
pressure second order
density second order upwind
momentum second order upwind
turbulent kinetic energy first order upwind
turbulent dissipation rate first order upwind
energy second order upwind
Initialization (Air Conditioning)
Initialization methods Hybrid

Results

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.

You can obtain Geometry & Mesh file, and a comprehensive Training Movie which presents how to solve the problem and extract all desired results.

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