Project
EXCEL CALCULATION :
We need to calculate the power density as a volumetric heat source for each cell
Dimensions for the cell as given below
Circle diameter 20mm
Angle between adjacent surface 90degree
Circular perimeter 62.8319mm
FORMULA
The volume of the each cell = (π/4).L.D2
Power = Energy/time
Power density =power/volume
Calculation
Diameter :0.02m
Length : 0.059m
Energy : 6015.850j
Volume of each cell = (pi/4)*L*D*^2
Hence volume = 1.85673E-05m^3
Time : 3*3600=10800sec
Power : 0.557019
Power density : 30000w/m^3
Procedure
MODAL SETUP
1.solver density solver
2.solver state – steady state
3.turbulence model – k-Epsilon model
4 .inlet velocity – 4m/s
5.volumetric heat source -30000w/M3
6.Outlet puressure -0 pascale
CASE 1 BATTERY THERMAL MANAGEMENT SYSYTEM
A. GEOMETRY :
Import geometry in spaceclaim and supress the outer casing
B. MESHING :
here we set prefrence as cfd in details of mesh and elements size as 12 mm in meshing which content 85127 number of elements along with tetrahedal mesh here we mesh the geometry by defining the size of diffrent element .we difining the name of the inlet and exit of the boundary and aslo naming each call and fluid volume
C. RESIDUAL PLOT
here simulation ran for 500 iteration and we observe that the solution has converage after 400 iteration
D. RESULT
TEMPERATURE CONTOUR OF THE CELL
the temperature value is shown higher in the cell due to the internal heat generation the airflow around the cells is also gets heated and take away heat from it but here we can see that the temperature of the cell decreses respectivly this is due to increse in velocity of air due to decrese in the area . the rate of heat transfer is increse due to the highest velocity of air the temperture of the battery is kept maintained which is good for opertion
VELOCITY CONTOUR PLOT
here we have three unknown equation and three unknown function one from conversation of mass and second from conversation of momentum i.e two velocity components in both x and y direation u(x,y),v(x,y).
the velocity is zero due to wall share
VELOCITY VOLUME RENDER
here we can see that velocity is 4m/s at the inlet but the velocity is increases at the top and sideways of cell this is due to decrease in area and as we know that area dreases velocty increses and rate of heat transfer is aslo increases
CASE 2 BATTERY THERMAL MANAGEMENT SYSYTEM
A. MESHING :
here we set prefrence as cfd in details of mesh and elements size as 8mm in meshing which content 85127 number of elements along with tetrahedal mesh here we mesh the geometry by defining the size of diffrent element .we difining the name of the inlet and exit of the boundary and aslo naming each call and fluid volume
TEMPERATURE CONTOUR OF THE CELL
the temperature value is shown higher in the cell due to the internal heat generation the airflow around the cells is also gets heated and take away heat from it but here we can see that the temperature of the cell decreses respectivly this is due to increse in velocity of air due to decrese in the area . the rate of heat transfer is increse due to the highest velocity of air the temperture of the battery is kept maintained which is good for opertion
VELOCITY CONTOUR PLOT
here we have three unknown equation and three unknown function one from conversation of mass and second from conversation of momentum i.e two velocity components in both x and y direation u(x,y),v(x,y).
the velocity is zero due to wall share
VELOCITY VOLUME RENDER
here we can see that velocity is 4m/s at the inlet but the velocity is increases at the top and sideways of cell this is due to decrease in area and as we know that area dreases velocty increses and rate of heat transfer is aslo increases
CASE 3 BATTERY THERMAL MANAGNMENT SYSYTEM
MESHING :
here we set prefrence as cfd in details of mesh and elements size as 6 mm in meshing which content 85127 number of elements along with tetrahedal mesh here we mesh the geometry by defining the size of diffrent element .we difining the name of the inlet and exit of the boundary and aslo naming each call and fluid volume
RESIDUAL PLOT
here simulation ran for 500 iteration and we observe that the solution has converage after 400 iteration
TEMPERATURE CONTOUR OF THE CELL
the temperature value is shown higher in the cell due to the internal heat generation the airflow around the cells is also gets heated and take away heat from it but here we can see that the temperature of the cell decreses respectivly this is due to increse in velocity of air due to decrese in the area . the rate of heat transfer is increse due to the highest velocity of air the temperture of the battery is kept maintained which is good for opertion
VELOCITY CONTOUR PLOT
here we have three unknown equation and three unknown function one from conversation of mass and second from conversation of momentum i.e two velocity components in both x and y direation u(x,y),v(x,y).
the velocity is zero due to wall share
VELOCITY VOLUME RENDER
here we can see that velocity is 4m/s at the inlet but the velocity is increases at the top and sideways of cell this is due to decrease in area and as we know that area dreases velocty increses and rate of heat transfer is aslo increases
CASE 4 BATTERY THERMAL MANAGEMENT SYSYTEM
MESHING :
here we set prefrence as cfd in details of mesh and elements size as 4 mm in meshing which content 85127 number of elements along with tetrahedal mesh here we mesh the geometry by defining the size of diffrent element .we difining the name of the inlet and exit of the boundary and aslo naming each call and fluid volume
RESIDUAL PLOT
here simulation ran for 500 iteration and we observe that the solution has converage after 400 iteration
TEMPERATURE CONTOUR OF THE CELL
the temperature value is shown higher in the cell due to the internal heat generation the airflow around the cells is also gets heated and take away heat from it but here we can see that the temperature of the cell decreses respectivly this is due to increse in velocity of air due to decrese in the area . the rate of heat transfer is increse due to the highest velocity of air the temperture of the battery is kept maintained which is good for opertion
VELOCITY CONTOUR PLOT
here we have three unknown equation and three unknown function one from conversation of mass and second from conversation of momentum i.e two velocity components in both x and y direation u(x,y),v(x,y).
the velocity is zero due to wall share
VELOCITY VOLUME RENDER
here we can see that velocity is 4m/s at the inlet but the velocity is increases at the top and sideways of cell this is due to decrease in area and as we know that area dreases velocty increses and rate of heat transfer is aslo increases
CONVERGENCE
The graph of volume average of temperature shows fluction between the temperture limits of 302.400 and 302.600k for all elements size 4mm but the larger element size the fluction is larger due to the less accuracy in the calculation because we know that as size of the element is decreses the accuracy of the solution increses
VELOCITY VISUALIZATION :
OBSERVATION AND CONCLUSION
when we compare all the 4 cases of the residal plot and various contour plot we can observe that if we fine the mesh to fine level we see an increses in accuracy of the result but after certain mesh size the accuracy almost remains constant
while simulating the btms it is not fine to use any soild material because battery manufacture would have specified the material that is being used for battery cell but for the simulation purpose it should be seen that the material should have certain thermal poperties to conduct the heat easily to the cooling liquid in the battery pack