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Simulation of heating in a room by a radiator in Ansys Fluent

Air conditioning is one of the important branches of mechanical engineering. Setting the temperature of a room or a building has always been one of the major concerns of air conditioning designers. The high cost of energy needed to provide suit air-conditioning for every structure proportionate to its utilization, induces engineers to design air-conditioners with the highest efficiency. This design, whether to the cost of construction and maintenance of the ventilation system or in terms of the best performance, requires extensive research. Simulation and analysis of these systems can play an effective role in determining the most suitable ventilation system for each structure.

In this project, it has been tried to simulate heat in a room by a radiator. This project is done in Ansys Fluent software.

Geometry and Mesh

Requirement geometry for analyzing heat in a room by radiator has been modeled in Ansys Design Modeler. Meshing also has been done in Ansys Meshing. The type of meshing in this analysis is unstructured and the number of cells is equal to 124325.


 Heat transfer in space depending on the ventilation system which is used, can be done in several ways. Due to the fact that in this analysis a radiator was used to generate heat and also there is no fluid flow stimulator, heat transfer is a kind of free convection and gravity should be considered. For analyzing flow turbulency, K-epsilon Realizable module has been used in order to analyze buoyancy forces which results from density changing. It should be noted that, for analyzing density changes proportional to temperature, the ideal gas module has been used for this project.

Boundary Condition

The walls of the room, except the floor and the surface that is defined as the window of the room, are considered isolated. The floor is also defined in a way that always is exposed to a constant thermal flux and plays the role of the heating system from the surface. Outlet part of the air flow has been defined as Pressure-outlet with the temperature of 300K.

Discretization of equations

By considering the type of heat transferring in this analysis, Pressure-Based solver has been used for solving equations. COUPLED algorithm has been used to discretize the coupled equations of speed and pressure. Momentum and energy equations have been discretized in form of  Second Order Upwind.

The results are presented as temperature and velocity contours.

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