Air Conditioning of Room with Balcony by Solar Radiation, ANSYS Fluent

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In this project, radiation heat transfer inside a room and a balcony is investigated.

This ANSYS Fluent project includes Mesh file and a Training Movie.

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Air Conditioning Project description

There are many types of air conditioning and ventilation systems used in buildings. The use of any ventilation system depends on the location of the building and the climatic zone of the desired location. Sunlight plays an important role in the temperature of the walls as well as the air temperature inside the building and this issue should be considered when designing the ventilation system.

In this project, heat transfer inside a room and a balcony is investigated. The balcony has a glass roof and one glass wall. Due to the radiation of sunlight, both room and balcony become warmer and natural convection plays an important role in circulating the flow inside these spaces. The standard k-epsilon model is exploited for solving turbulent flow equations and P1 solar tracing model is used for simulating the solar rays entering the computational domain and the energy model is activated to calculate the temperature distribution in the domain. it should also be pointed out that ideal-gas law is used to account for the changes in density due to temperature changes.

Geometry and mesh

The geometry for analyzing this simulation consists of a room and a balcony. The geometry is designed in ANSYS design modeler® and is meshed in ANSYS meshing®. The mesh type used for this geometry is structured and the element number is 290250.

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Air Conditioning 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 steady.
  • The effect of gravity has been taken into account and is equal to -9.81 m/s2 in Z direction.

The applied settings are summarized in the following table.

(Air Conditioning) Models
Viscous model k-epsilon
k-epsilon model standard
near wall treatment standard wall function
Energy model On
Radiation model P1
Solar ray tracing Used solar calculator
(Air Conditioning) Boundary conditions
wall motion stationary wall
glass1, glass2, glass3 Thermal condition Convection
Heat transfer coefficient 20 W/m2K
Free stream temperature 310 K
Radiation Semi-transparent
Wall-argon, wall-zone, wall-room Thermal condition Convection
Heat transfer coefficient 20 W/m2K
Free stream temperature 310 K
Radiation opaque
Wood Thermal condition Coupled
Radiation opaque
(Air Conditioning) Solution Methods
Pressure-velocity coupling Simple
Spatial discretization pressure Second order
momentum second order upwind
turbulent kinetic energy first order upwind
turbulent dissipation rate first order upwind
Energy second order upwind
(Air Conditioning) Initialization
Initialization method   Standard
gauge pressure 0 Pa
velocity (x,y,z) (0,0,0) m/s
Turbulent kinetic energy 1 m2/s2
Turbulent dissipation rate 1 m2/s3
Temperature 310 K

Air Conditioning Results

After the simulation process, the contours of pressure, velocity, temperature, etc. are extracted and presented. As can be seen in streamline contours, since we do not have any external flow, the natural convection is responsible for circulating the flows in the room and balcony.

Mesh file is available in this product. By the way, the Training File presents how to solve the problem and extract all desired results.


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