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Air Conditioning (Side Supply), Paper Validation, ANSYS Fluent Training

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The present problem simulates the HVAC process through an side supply air conditioning system in an office using ANSYS Fluent software. This simulation is based on the information of a reference article [Comparison of air-conditioning systems with bottom-supply and side-supply modes in a typical office room] and its results are compared and validated with the results in the paper.

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

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Description

Paper Description

The present problem simulates the HVAC process through an side supply air conditioning system in an office using ANSYS Fluent software. This simulation is based on the information of a reference article [Comparison of air-conditioning systems with bottom-supply and side-supply modes in a typical office room] and its results are compared and validated with the results in the paper. The simulation is performed for a state of the paper where the side-supply air conditioning system is designed. Based on the design of the air conditioning system by the mentioned article, two panels have been designed for the entry of fresh air in two opposite walls; In this way, air enters the room through four panels (each wall has two panels). The air inside the room is then exits to the outside environment through two panels on the ceiling of the room.

The inlet air of the air conditioner system has a speed of 0.21 m.s-1 and a temperature of 21 ºC. Inside the room, four people, four computers on the table, and six heat sources are designed. In fact, according to the article, first the experimental work and then a numerical study was done; So that for each of the factors in the interior of the room, a certain amount of energy is considered and to simplify the work, simple geometries are used to define these heat sources. Four humans are defined as cylinders with 150 W energy and four computers as small cubes placed on tables with 150 W energy and six heat sources with 200 W energy.

To define these heat sources, the thermal flux boundary condition on the walls of these energy sources is used; By dividing this energy on the outer surface of the walls of these heat sources, the desired amount of heat flux is obtained. In addition, the outer walls of the room have a constant temperature of 26 ºC and the surfaces of the tables are defined as insulation.

Side Supply Air Conditioning System Geometry & Mesh

The present model is designed in three dimensions using Design Modeler software. The present model is related to the interior of a room with a length and width of 6 m, 4 m, and a height of 3.5 m. Inside the room, four people, four desks, four computers, and six heat sources are designed; Assuming that these items have a very simple geometric structure in the form of cylinders and cubes. Four entrance borders are defined on the room’s sidewalls, and two exit borders are defined on the ceiling of the room.

air conditioning

We carry out the model’s meshing using ANSYS Meshing software. The mesh type is unstructured. The element number is 1027974. The following figure shows the mesh.

air conditioning

Air Conditioning CFD Simulation

We consider several assumptions to simulate the present model:

  • We perform a pressure-based solver.
  • The simulation is steady.
  • The gravity effect on the fluid is equal to -9.81 m.s-2 along the vertical axis.

The following table represents a summary of the defining steps of the problem and its solution:

Models
Viscous Model k-epsilon
k-epsilon model RNG
near-wall treatment standard wall function
Energy On
Boundary conditions
Inlet-Water Velocity Inlet
velocity magnitude 0.21 m.s-1
temperature 21 ºC
Outlet-Water Pressure Outlet
gauge pressure 0 Pascal
Walls-Person Wall
wall motion stationary wall
heat flux 73 W.m-2
Wall-Computer Wall
wall motion stationary wall
heat flux 1646 W.m-2
Wall-Heat Source Wall
wall motion stationary wall
heat flux 2195 W.m-2
Wall-Desk Wall
wall motion stationary wall
heat flux 0 W.m-2
External Wall Wall
wall motion stationary wall
temperature 26 ºC
Methods
Pressure-Velocity Coupling Coupled
pressure PRESTO
momentum first order upwind
turbulent kinetic energy first order upwind
turbulent dissipation rate first order upwind
energy first order upwind
Initialization
Initialization methods Hybrid

Results

The validation of the present simulation is performed based on diagrams “a” and “b” from Figure 9 of the mentioned article. These diagrams show the temperature changes in terms of height from the floor of the room. A height of 2 meters from the ground floor includes ten measuring points at a distance of 0.2 meters from each other. Figure a shows the location of E, which is longitudinally 3 meters from the two walls and transversely is 1.6 meters and 2.4 meters from the other two walls; While diagram b shows the location F, which is facing longitudinally at a distance of 3 meters from the two walls and transversely at a distance of 3.2 meters and 0.8 meters from the other two walls.

Then, for each of the locations E and F, ten sample points are considered for measuring from a distance of 0.2 m from the floor to a distance of 2 m from the floor, and a graph of temperature changes in these points is obtained. Figures show the temperature changes in height in two locations E and F, respectively. According to these graphs, the current numerical simulation results are compared with the results in the paper.

air conditioningair conditioning

Also, after the completion of the solution process, two-dimensional and three-dimensional contours related to temperature and velocity inside the room are obtained, and also the air flow lines inside the room are obtained in three dimensions.

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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