# Simulates the flow of natural heat transfer using radiator by ANSYS Fluent

Regulating the temperature of a room or a building at an ideal temperature for comfort has always been a concern for designers of air conditioning systems. The high cost of energy for heating as well as the risks associated with the use of fossil fuel heating systems have made the use of radiators more attractive.

Natural convection heat transfer is the most convenient and least costly method for using such heating systems.

Buoyancy or natural heat transferring in this analysis has been analyzed by a radiator as a thermal source. Radiator with heat flux generates 2KW heat. Due to the heat of the fluid around the radiator, the fluid density decreases and move upward. The fluid will start to circulate and the room will begin to warm up slowly.

In natural convection problems, the only driving force is produced when fluid density changes. Since the density is a function of temperature, therefore the identification of the temperature field is necessary for solving the velocity field. So it is important to solve momentum and energy equations simultaneously.

In this analysis, it has been attempted to simulate and analyze the simulates the flow of natural heat transfer using a radiator by ANSYS Fluent software.

### Geometry and Meshing

Requirement geometry for analyzing Simulation of a radiator and natural heat transfer has been modeled in Gambit. Meshing also has been done in Gambit. The type of meshing in this analysis is unstructured and the number of cells is equal to 633384.

### Model

Heat transfer in space depending on the ventilation system can occur in several ways. Due to the fact that in this analysis, a radiator is used for heat generation and no fluid flow simulator is used in this project, so the type of heat transfer is convection and gravity should be considered.

### Boundary Condition

The walls of the room except for the floor and ceiling of the room are considered as a wall that is exchanging heat with the outside environment. The outside temperature of the room is 280K and the heat transfer rate of the wall is 10 W / m ^ 2.k. The floor is defined as having no heat exchange with the outside and is insulated. It should be noted that the walls of the room considered wood.

### Discretization of equations

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

After analyzing the temperature distribution, the heat dissipation from the ceiling was investigated in three different heights for the roof and the results were presented as temperature and velocity contours.

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