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Radiation Heat Transfer, Computer Room ANSYS Fluent Training

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In this project, air conditioning of a computer room containing four computers is simulated by ANSYS Fluent software.

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

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Description

 Computer Room Air Conditioning Considering Radiation Heat Transfer Problem description

In this project, steady airflow enters the domain from the bottom of the room by several inlets and exits the domain from several outlets on the ceiling considering radiation heat transfer. This air conditioning method is new and is commonly used in office environments nowadays. This method provides more energy efficiency since the flow naturally goes upwards due to density difference and buoyancy body force. One of the room’s four main walls is exposed to a constant heat flux equal to 194 W/m2. Air temperature at the inlet is considered equivalent to 291.1 K. because of the heat transfer to the air, the area-weighted average temperature of the air at outlets is equal to 298.9125 K.

Computer Room Geometry and Mesh

The fluid domain geometry is designed in Design Modeler, and the computational grid is generated using ANSYS Meshing. The mesh type is unstructured, and the element number is 3231646.

radiation

Solver configuration for CFD Simulation

Critical assumptions:

  • Solver type is assumed Pressure Based.
  • Time formulation is assumed Steady.
  • Gravity effects is considered in –Y direction equal to 9.81m/s2.

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

Models (Radiation)
Energy On
Viscous K-epsilon model Realizable
Near wall treatment Standard wall treatment
Radiation Model Surface to surface (S2S)
Materials (Radiation)
Fluid Definition method Fluent Database
Material name Air
Density model Ideal gas
Boundary conditions (Radiation)
Inlet_air Type Velocity inlet
Velocity magnate 0.6125 m/s
Thermal 291.8 K
Internal emissivity 1
Hot wall (Radiation) Type Wall
Heat flux 193.25 W/m2
Internal emissivity 1
Simulator Type Wall
Heat flux 90.56 W/m2
Internal emissivity 1
laptop Type Wall
Heat flux 153.25 W/m2
Internal emissivity 1
Solver configurations (Radiation)
Pressure-velocity coupling Scheme SIMPLE
Spatial discretization Gradient Least square cell-based
Density Second order Upwind
Pressure Standard
Momentum Second order Upwind
K First order Upwind
Epsilon First order Upwind

Results and Discussion

The mixture mass flow rate at the Computer room outlet is equal to 0.568 kg/s. The air density has the minimum value on surfaces that heat flux is applied to them due to increase in fluid temperature, density decreases, and upward buoyant force affects the fluid volume. It can be seen that the higher we go along room height, the less air density is observed. High temperatures equal to 327 k are observed on laptop surfaces and hot walls. Extreme turbulence can be seen on the hot wall and top of the simulator’s head. The reason is the consideration of high heat fluxes for laptops, simulators, and hot walls.

There are a Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

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