Item description

Simulate and analyze the airflow inside the Heller cooling tower

A Dry cooling tower is used indirectly as a heat transfer mechanism between fluid (water) and cooling fluid (air). (Working fluid) The water cycle in the heat exchanger is exhausted from the condenser and pumped to the ring of heat exchanger assembly. These converters are air-cooled and cooled by the natural suction of air generated by the temperature difference inside and outside the cooling tower. The higher the airflow outside the tower, the higher the water cycle, the higher the thermal drift force. Due to the low-temperature difference between cycling fluid and ambient air in the summer season, the thermal drift decreases and the cooling tower’s efficiency decreases. The temperature of the return water from the cooling tower to the condenser is not much reduced. As a result, the vacuum quality is reduced to a minimum and the unit is forced to produce less power. As well as the amount of water consumed in the cooling tower, which is sprayed onto the heat exchangers to cool the water cycle.

In this project, we have tried to simulate and analyze the flow of air inside the Heller cooling tower using Ansys Fluent software.

Geometry and mesh

The geometry required for this analysis includes a cooling tower, radiator and flow range and an air flow input. This geometry is designed in Gambit software and networking is also required by the same software for this geometry. The networking generated for this geometry is unorganized and the total number of cells created for this geometry is 1343988 cells.

Model

To analyze the current turbulence in this project, the K-epsilon Standard turbulence viscosity model has been used. The standard wall function is used near the wall. The ideal gas state equation is used to check the temperature variations in terms of temperature. Also, the energy equations are solved with the momentum equations.

Boundary conditions

The flow input for this air geometry is defined as Pressure Inlet, and the 305K temperature condition is considered. For the wall of the cooling tower, the Wall boundary condition is used with the Coupled temperature boundary condition. The boundary condition required for the radiator is also applied to the condition of the problem. The output is also considered as a Pressure Outlet for the flow range.

Discretization of equations

Simple algorithm is used to solve the equations in this analysis. Also, a pressure-based solution for flow resolution is used. The First Order Upwind method is used to discriminate equations.

Finally, the results are shown as cantors of velocity, pressure, temperature and flow lines.

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