Fan Heater for HVAC System, CFD Simulation
In this project, a fan heater performance and the movement of the heated airflow inside a room is investigated.
This product includes a Mesh file and a comprehensive Training Movie.
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In this project, a fan heater performance and the movement of the heated airflow inside a room is investigated. 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 ANSYS design modeler and meshed in ANSYS meshing. The mesh type used for this geometry is unstructured and the element number is 207707.
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.
|near wall treatment||standard wall function|
|buttom||Heat flux||0 W/m2|
|Heat transfer coefficient||5 W/m2K|
|Free stream temperature||5 C|
|Wall box||Heat flux||0 W/m2|
|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|
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.
There are a Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.