Solar Chimney for a Room HVAC, CFD Simulation Tutorial

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  • The problem is simulating the HVAC inside the room using a solar chimney by ANSYS Fluent software.
  • The 2-ِD geometry of the present model is carried out using Design Modeler software.
  • The meshing of the present model has been done using ANSYS Meshing software. The mesh type is structured and the element number is 42846.
  • The Buoyancy effect plays the main role in the room HVAC. Convection heat transfer is applied.
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Geometry, Mesh, and CFD Simulation methodologygy explanation, result analysis and conclusion
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The problem is simulating the HVAC inside the room considering a solar chimney by ANSYS Fluent software. The present model consists of two main parts, including the interior of the room and a sloping solar chimney on the room’s ceiling.

The solar chimney consists of glass plates on its side surfaces that are in contact with the environment. As a transparent medium, it receives solar energy and has a plate on its back as a heat-absorbing surface. It is assumed that the adsorbent surface behind the chimney has a constant temperature of 335.15 K.

In contrast, the glass surface in contact with the external environment has convective heat transfer with its surroundings. The ambient air temperature is 308.15 K, and the convection heat transfer coefficient is 8 W/m2K.

It is also assumed that the heat received from sunlight inside the chimney creates a constant heat source inside the chimney, equivalent to 15000 W/m3.

Solar Chimney Methodology

The 2-D geometry of the present model is carried out using Design Modeler software. The model’s geometry consists of two parts, including a room measuring 2 m⨯3 m and a solar chimney with a length of 2 m, a slope of 45 degrees to the room’s ceiling and a width of 0.15 m.

The meshing of the present model has been done using ANSYS Meshing software. The mesh type is structured, and the element number is 42846.

Solar Chimney Conclusion

After the solution process is completed, two-dimensional contours of pressure, temperature, and velocity, as well as pathlines and velocity vectors, are obtained.

Also, the diagram of temperature distribution in the transverse direction at a point in the middle of the solar chimney (at a distance of 1 meter from the inlet and outlet) and the graph of velocity changes in the transverse direction in the chimney outlet section is obtained.

The airflow from the inlet section at the bottom of the room has a pressure-inlet boundary condition; In this way, this incoming airflow at a temperature of 308.15 K is sucked into the room by the heat of the solar chimney and is transferred to the environment outside the room.

The temperature profile at a point in the solar chimney at a distance of 1 m from the chimney inlet with a thickness of 0.15 m has been obtained and compared with the temperature profile of the same case in a paper.


  1. Avatar Of Alberta Lehner

    Alberta Lehner

    This training is very comprehensive, complete, excellent, and unique. I suggest to all my friends not to miss this training.

  2. Avatar Of Scottie Botsford

    Scottie Botsford

    The intricacy in your simulations is commendable. Great job!

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your compliment! We always aim to provide the most accurate and detailed simulations possible.

  3. Avatar Of Alexandre Marvin

    Alexandre Marvin

    Why do you prefer Design Modeler and ANSYS Meshing for your simulations?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      These tools offer advanced capabilities for creating high-quality models and precise meshes, which are essential for accurate CFD simulations.

  4. Avatar Of Jackie Schroeder

    Jackie Schroeder

    I have a specific simulation in mind. Can you cater to my request?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Absolutely! We are open to contributions and would be happy to create a custom simulation for you. Please share more details about it.

  5. Avatar Of Mollie Dicki

    Mollie Dicki

    It was good. thank you.

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