Radiation Heat Transfer in a Computer Room, CFD Simulation
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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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.
Solver configuration for CFD Simulation
- 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.
|Near wall treatment||Standard wall treatment|
|Radiation||Model||Surface to surface (S2S)|
|Fluid||Definition method||Fluent Database|
|Density model||Ideal gas|
|Boundary conditions (Radiation)|
|Velocity magnate||0.6125 m/s|
|Hot wall (Radiation)||Type||Wall|
|Heat flux||193.25 W/m2|
|Heat flux||90.56 W/m2|
|Heat flux||153.25 W/m2|
|Solver configurations (Radiation)|
|Spatial discretization||Gradient||Least square cell-based|
|Density||Second order Upwind|
|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.