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Air Conditioning of an Office CFD Simulation

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Heating, Ventilation, and Air Conditioning (HVAC) is a set of processes used to control the temperature, humidity, and ambient air quality of an environment.

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Problem Description for an Office HVAC

The present study examines the performance of fan-driven airflow inside an office for HVAC operation, including a computer and four lamps. The computer is made of plastic and is considered as a heat source equivalent to 700 W.m-3, while each lamp material is glass and a heat source equal to 2500 W.m-3. On the upper part of two walls of the office, we install two fans to transfer airflow into the office. We also assumed that the doors and windows of the office have convection heat transfer by ambient air. The problem goal is to investigate the effect of blown airflow on the components and people in the office. Also, we simulate the influence of airflow on the heat sources applied in the model.

The Assumption for HVAC simulation

We consider several hypotheses for this simulation:

The office HVAC simulation is STEADY-STATE, and the solver is PRESSURE-BASED.

We consider the effect of gravity on the flow to be 9.81 m.s-2, because of the natural convection phenomenon caused by the buoyancy force in this model.

Geometry and Mesh

The present 3-D model was designed by Design Modeler software. The geometry consists of a cubic space called the office for HVAC operation, which consists of several components, including human, lamp, computer, desk and so on.

An unstructured mesh was performed using ANSYS Meshing software. Meshing has been done more accurately for the internal components of the office. In this network, the element number is 547820.

HVAC CFD Simulation Steps

Here is a summary of the steps to define and solve the problem:

Models (Air Conditioning)
k-epsilon Viscous model
Standard k-epsilon model
Standard wall function Near wall treatment
On Energy
Boundary conditions for HVAC Simulation (Air Conditioning)
Fan Fan
Polynomial pressure jump fan 1
polynomial pressure jump fan 2
wall Walls type for HVAC CFD Simulation
20 W.m-2.K-1 heat transfer coefficient Inlet (door)
283 K Free stream temperature
25 W.m-2.K-1 heat transfer coefficient windows
283 K Free stream temperature
310 K temperature wall under computer
isolated bottom (floor)
isolated main walls (outer walls)
isolated walls of other componenet in office for HVAC CFD Simulation
couppled other inner walls
Solution Methods for HVAC Simulation
Simple   Pressure-velocity coupling
Second order upwind pressure Spatial discretization for HVAC Simulation
Second order upwind momentum
Second order upwind energy
Second order upwind density
first order upwind turbulent kinetic energy
first order upwind turbulent dissipation rate
Initialization for HVAC CFD simulation
Standard Initialization method
283 K temperature
0 m.s-1 velocity (x, y, z)

Ideal Gas

Since in the present model, the airflow is blown by the fans at a rapid rate, the ideal gas model is used to define the air because the airflow is compressible during the process. In the compressible flows, the density is not a constant value and varies with pressure and temperature, which is calculated by the relation of the ideal gas law as follows:

ideal gas


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


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