Air conditioning simulation ANSYS Workbench Ott Pabut

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1 Air conditioning simulation ANSYS Workbench Ott Pabut Tallinn 2010

2 Task Set up air conditioning simulation with program Ansys Workbench. inlet heater door windows outlet thermometer Fig1 - Task 1.1 Creating a new project Open program ANSYS Workbench 1. Click Empty project 2. From the wizard choose File, Save As Name the project HVAC 4. From the left menu choose Advanced CFD, New Simulation Workbench offers possibilities for different flow simulations General, Turbomachinery, Quick Setup, Library Template 5. Choose General as the simulation type Now workbench will open the flow simulation preprocessing unit CFX-pre 6. From the wizard choose File, Save Simulation As... Name the project as HVAC.cfx 2

3 1.2 Importing the mesh 1. Choose File, Import mesh... and upload the file named HVACmesh.cfx 2. Save the simulation 1.3 Setting the simulation type 1. Push Simulation Type 2. Apply following settings Basic Settings Simulation Type > Option Transient Simulation Type > Time Duration > Total Time 45 [s] Simulation Type > Time Steps > Timesteps 3 [s] Simulation Type > Initial Time 0 [s] 3. Push OK 1.4 Creating the computational domain for fluid In the current simulation two different computational domains are created: one for fluid and one for solid (the heater). As the solid and fluid cannot exist in the same space, they must be separated with different domains. 1. On the upper taskbar click Create a Domain and name it FluidZone. 2. Apply the following settings to the domain General Location B65 options Basic Settings > Domain Type Fluid Domain Basic Settings > Fluids List Air Ideal Gas Domain Models > Pressure > Reference Pressure 1 [atm] Domain Models > Buoyancy > Buoyant Domain Models > Buoyancy > Gravity X Dirn. 0 [m/s 2 ] Domain Models > Buoyancy > Gravity Y Dirn [m/s 2 ] Domain Models > Buoyancy > Gravity Z Dirn 0 [m/s 2 ] Domain Models > Buoyancy > Bouy. Ref. 1.2 [kg/m 3 ] Density Fluid Models Heat Transfer > Option Thermal Energy Thermal Radiation Model > Option Monte Carlo 3

4 In order to get realistic results the boundary conditions must be similar to those in the reality. Air as an ideal gas is with gravitational force is used and the heat distribution is described with the Monte Carlo statistical method. 3. Click OK 1.5 Creating the computational domain for solid 1. On the upper task bar click Create a Domain and name it SolidZone. 2. Apply the following settings to the domain General options Location B18 Basic Settings > Domain Type Solid Domain Basic Settings > Solids List Copper Solid Models Heat Transfer > Option Thermal Energy Thermal Radiation Model Monte Carlo Initialization Domain Initialization (Selected) Domain Initialization > Initial Conditions (Selected) Domain Initialization > Initial Conditions > Automatic with Value Temperature > Option Domain Initialization > Initial Conditions > Temperature > Temperature 80 [C] Copper is chosen as the heater material and temperature for the whole volume is 80 C. 3. Click OK 1.6 Inserting the boundary conditions The imported mesh contains predefined 2D regions, which make it easier to apply boundary conditions. For the simulation, following conditions are needed: inlet outlet, windows and walls (no slip condition). Inlet 1. From the upper taskbar click Create a Boundary Condition 2. Name - Inlet (make sure that the domain is FluidZone) 3. Apply following settings Basic Settings Boundary Type Inlet Location Inlet 4

5 Boundary Flow Regime > Option Subsonic Details Mass and Momentum > Option Mass Flow Rate Mass and Momentum > Mass Flow Rate 0.07 [kg/s] Flow Direction > Option Cartesian Components Flow Direction > X Component 5*(x-0.05 [m]) / 1 [m] Flow Direction > Y Component -1+5*(x-0.05 [m]) / 1 [m] Flow Direction > Z Component 0 Heat Transfer > Static Temperature 10 [C] Plot Options Boundary Vector (Selected) Make sure that when describing the flow direction components,the equation writing function Outlet is enabled 4. Click OK 1. Create a new boundary condition Outlet 2. Apply following settings Basic Settings Boundary Type Outlet Location Outlet Boundary Flow Regime > Option Subsonic Details Mass and Momentum > Option Average Static Pressure Mass and Momentum > Relative Pressure 0 [Pa] Relative pressure defines the difference between the outlet and inlet pressure, currently the same pressure applies for both and therefore the relative is 0 Pa. 3. Click OK 5

6 Next the heat flux from the windows is defined Windows Fig 2 Inlet and Outlet 1. Create a new boundary condition Windows 2. Apply the following settings Basic Settings Boundary Type Wall Location Window1, Window2 Boundary Heat Transfer > Option Temperature Details Heat Transfer > Fixed Temperature 26 [C] Sources Boundary Source (Selected) Boundary Source > Sources (Selected) 3. Create a new radiation source Add New Item and accept the default name 4. Apply the following setting to the Radiation Source. Settings Value Option Directional Radiation Flux Radiation Flux 600 [W/m 2 ] Direction > Option Cartesian Components Direction > X Component 0.33 Direction > Y Component Direction > Z Component Apply the following settings Plot Options Boundary Vector (Selected) 6

7 6. Click OK Rest of the walls and the door 1. Change the boundary condition FluidZone Default 2. Apply following settings Boundary Heat Transfer > Option Temperature Details Heat Transfer > Fixed Temperature 26 [C] 3. Click OK 1.7 Setting the initial conditions 1. Click Define the Global Initial Conditions 2. Apply following settings Global Initial Conditions > Velocity Type Cartesian Settings Initial Conditions > Cartesian Velocity Automatic With Value Components > Options Initial Conditions > Cartesian Velocity 0 [m s ^-1] Components > U Initial Conditions > Cartesian Velocity 0 [m s ^-1] Components > V Initial Conditions > Cartesian Velocity 0 [m s ^-1] Components > W Initial Conditions > Static Pressure > Relative 0 [Pa] Pressure Initial Conditions > Temperature > Temperature 22 [C] Initial Conditions > Turbulence Kinetic Energy > (Selected) Fractional Intensity Initial Conditions > Turbulence Eddy Dissipation (Selected) Initial Conditions > Turbulence Eddy Dissipation (Selected) > Eddy Length Scale Initial Conditions > Turbulence Eddy Dissipation 0.25 [m] > Eddy Length Scale > Eddy Len. Scale Initial Conditions > Radiation Intensity > (Selected) Blackbody Temperature Initial Conditions > Radiation Intensity > Blackbody Temperature > Blackbody Temp. 22 [C] 7

8 3. Click OK 1.8 Modifying the solver control 1. Click Solver Control 2. Apply following settings Basic settings Transient Scheme > Option Second Order Backward Euler Convergence Control > Max. Coeff. Loops 1 3. Vajuta OK In normal circumstances 3-4 convergence loops are needed to achieve a good result. In this case there are less to save simualting time. 1.9 Setting the output data 1. Click Create Output Files and Monitor Points 2. Click Trn Results 3. Create a new Transient Results unit by clicking Add New Item and accept the default name 4. Apply following settings to the Transient Results 1 Settings Value Option Selected Variables Output Variables List Pressure, Radiation Intensity, Temperature, Velocity Output Frequency > Timestep Interval 3 5. Apply following settings Monitor Monitor Options (Selected) 6. Create a new Monitor Points and Expressions unit named Thermometer 7. Apply following settings to the Thermometer Settings Value Output Variables List Temperature Cartesian Coordinates 3.5, 1.5, 0 8. Click OK 8

9 1.9.1 Getting the result 1. Click Write Solver File 2. Name it HVAC.def 3. Click Save Now Workbench will open Run Definition window 4. Click Start Run Progress of the calculations can be observed form the Momentum and Mass charts. If the results appear to go into the wrong direction, we can stop the calculations and enforce necessary changes. On the right, info about the progress of the calculation and iterations is displayed. Fig 3 Progress of the calculations When the number of iterations has been reached or results have converged Workbench will issue a message. To display and process results, question Post-process results now? must be answered Yes. To study the simulation progress, the answer should be No. The results can also be viewed by selecting CFX-Post form the lower taskbar. 9

10 1.10 Visualization and processing of results Choose FluidZone and SolidZone in the Domain Selector and click OK. To display results a base plane must be created. 1. From the upper taskbar click Insert, Location, Plane 2. Name it Baseplane 1 3. Apply following settings Geometry Definition > Method XY Plane Definition > Z 1.75 [m] Color Mode Variable Mode > Variable Temperature Mode > Range User Specified Mode > Min 15 [C] Mode > Max 23 [C] 4. Click Apply After creating the base plane, temperature on it can be displayed for every time step. 1. Click Timestep Selector 2. Double-click on the step you want to observe Create a second base plane for observing the temperature 1. From the upper taskbar select Insert, Location, Plane 2. Name it Baseplane 2 3. Apply following settings Geometry Definition > Method ZX Plane Definition > Y 0.5 [m] Color Mode Variable Mode > Variable Temperature Mode > Range User Specified Mode > Min 15 [C] Mode > Max 23 [C] 4. Click Apply Now isosurface for displaying areas that have the similar temperature is created. 1. Click Insert, Location, Isosurface 2. Name it Isosurface 1 3. Apply following settings 10

11 Geometry Definition > Variable Temperature Definition > Value 19 [C] Symbol Symbol Size Click Apply Fig 3 Temperature range 11

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