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Split Air Conditioner for Room HVAC, ANSYS Fluent CFD Simulation Training

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In this project, the movement of the heated airflow inside a room is investigated. The air inside the room is heated using two split coolers and is distributed inside the space with people, using two fans.

This product includes Geometry & Mesh file and a comprehensive Training Movie.

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Description

Split Air Conditioner Project description

In this project, the movement of the heated airflow inside a room is investigated by ANSYS Fluent software. The air inside the room is heated using two split coolers and is distributed inside the space with people, using two fans. Realizable 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.

Geometry and Mesh

The geometry of this project is designed in ANSYS Design Modeler and consists of two split cooler systems and office apparatus. The present model is meshed in ANSYS Meshing. The mesh type used for this geometry is unstructured and the element number is 547820.

splitsplit

Split Air Conditioner 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 Y direction.

The applied settings are summarized in the following table.

 
Models
Viscous model k-epsilon
k-epsilon model Realizable
near wall treatment standard wall function
Energy On
Cell Zone condition
Heater 1 & 2 Energy source term 84388.135 W/m3
Computer Energy source term 700 W/m3
Lamps Energy source term 2500 W/m3
Boundary conditions
Fan fan
Pressure jump polynomial
Walls Stationary wall
Bottom, room walls, splitters walls Heat flux 0 W/m2
Computer body Temperature 310 K
door Convection
Heat transfer coefficient 20 W/m2K
Free stream temperature 283 K
Wall thickness 0.05 m
Window convection
Heat transfer coefficient 25 W/m2K
Free stream temperature 283 K
Wall thickness 0.02 m
Solution Methods
Pressure-velocity coupling   SIMPLE
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
Initialization
Initialization method   Standard
Gauge pressure 0 Pa
Velocity (x,y,z) (0,0,0) m/s
turbulent kinetic energy 0 m2/s2
turbulent dissipation rate 0 m2/s3
Temperature 283 K

Results

Contours of pressure, velocity, temperature, etc. are obtained and presented.

As was discussed about the movement of airflow due to the free convection 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 (buoyancy effect), in its journey to higher parts of the room, it will again lose its temperature gradually and falls down. This recurring process will causes such flow patterns.

You can obtain Geometry & Mesh file, and a comprehensive Training Movie which presents how to solve the problem and extract all desired results.

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