Fan Heater for HVAC System ANSYS Fluent CFD Simulation Training

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In this project, a fan heater performance and the movement of the heated airflow inside a room is investigated.

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

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Project description

In this project, a fan heater performance and the movement of the heated airflow inside a room is investigated by ANSYS Fluent software. The air inside the room passes over a heater placed on one side of the room and a fan is responsible to push the heated air into the room. RNG k-epsilon model is exploited to solve turbulent flow equations and the Energy equation is activated to calculate the temperature distribution inside the computational domain. It should be noted that the ideal gas equation is opted to capture the changes of the air density due to temperature change.

Fan Heater Geometry & Mesh

The geometry of this project is designed in Design Modeler and meshed in ANSYS meshing. The mesh type used for this geometry is unstructured and the element number is 207707.

fan heater

fan heater

Fan Heater CFD Simulation Settings

The key assumptions considered in this project are:

  • Simulation is done using pressure-based solver.
  • The present simulation and its results are considered to be steady and do not change as a function time.
  • The effect of gravity is activated and its value is equal to -9.81 m/s2 in Z direction.

The applied settings are summarized in the following table.

Viscous model k-epsilon
k-epsilon model RNG
near wall treatment standard wall function
Energy On
Boundary conditions
Fan fan
Pressure jump polynomial
Walls Stationary wall
buttom Heat flux 0 W/m2
Heater Temperature 110 C
Box Convection
Heat transfer coefficient 5 W/m2K
Free stream temperature 5 C
Material Wood
Wall box Heat flux 0 W/m2
Solution Methods
Pressure-velocity coupling   SIMPLE
Spatial discretization Pressure Second order
Density second order upwind
Momentum second order upwind
Energy second order upwind
turbulent kinetic energy first order upwind
turbulent dissipation rate first order upwind
Initialization method   Hybrid


Contours of pressure, velocity, temperature, etc. are obtained and presented.

As shown in the pressure contour, the pressure near the heater has decreased because of the heated air and its movement. Now this heated air will move upward because of both forced and natural convection.

As was previously discussed about airflow movement due to the natural and forced convection, the flow pattern and streamlines can be observed in streamline contour. The hot air will travel upward because of the decreased density. Its journey to higher parts of the room will again lose its temperature gradually and falls. This systematic process will cause such flow patterns.

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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