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SUAVE
2.5.2
An Aerospace Vehicle Environment for Designing Future Aircraft
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SUAVE
2.5.2
An Aerospace Vehicle Environment for Designing Future Aircraft
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Functions pertaining to battery discharge and sizing. More...
Modules | |
| State_Estimation_Models | |
| Functions to evaluate battery state variables. | |
| Ragone | |
| Functions to evaluate a Ragone of the battery. | |
| Sizing | |
| Functions to size battery from mass, specific energy, and specific power. | |
| Variable_Mass | |
| Functions pertaining to variable mass batteries (such as metal air) | |
Functions | |
| def | SUAVE.Methods.Power.Battery.append_initial_battery_conditions.append_initial_battery_conditions (segment, battery) |
| def | SUAVE.Methods.Power.Battery.compute_net_generated_battery_heat.compute_net_generated_battery_heat (n_total, battery, Q_heat_gen, numerics) |
| def | SUAVE.Methods.Power.Battery.pack_battery_conditions.pack_battery_conditions (conditions, battery, avionics_payload_power, P) |
| pack_battery_conditions.py More... | |
Functions pertaining to battery discharge and sizing.
| def SUAVE.Methods.Power.Battery.append_initial_battery_conditions.append_initial_battery_conditions | ( | segment, | |
| battery | |||
| ) |
Packs the initial battery conditions
Assumptions:
Battery temperature is set to one degree hotter than ambient
temperature for robust convergence. Initial mission energy, maxed aged energy, and
initial segment energy are the same. Cycle day is zero unless specified, resistance_growth_factor and
capacity_fade_factor is one unless specified in the segment
Source:
N/A
Inputs:
atmosphere.temperature [Kelvin]
Optional:
segment.
battery_cycle_day [unitless]
battery_pack_temperature [Kelvin]
battery_charge_throughput [Ampere-Hours]
battery_resistance_growth_factor [unitless]
battery_capacity_fade_factor [unitless]
battery_discharge [boolean]
increment_battery_cycle_day [boolean]
Outputs:
segment
battery_discharge [boolean]
increment_battery_cycle_day [boolean]
segment.state.conditions.propulsion
battery_discharge_flag [boolean]
battery_max_initial_energy [watts]
battery_energy [watts]
battery_max_aged_energy [watts]
battery_pack_temperature [kelvin]
battery_cycle_day [int]
battery_cell_charge_throughput [Ampere-Hours]
battery_resistance_growth_factor [unitless]
battery_capacity_fade_factor [unitless]
Properties Used:
None
| def SUAVE.Methods.Power.Battery.compute_net_generated_battery_heat.compute_net_generated_battery_heat | ( | n_total, | |
| battery, | |||
| Q_heat_gen, | |||
| numerics | |||
| ) |
Computes the net heat generated in a battery during cycling.
Assumptions:
1) Battery pack cell heat transfer can be modelled as a cooling columns in a cross-flow
2) Isothermal battery cell - the temperature at the center of the cell is the same at
the surface of the cell
Source:
Heat Transfer Model:
Pakowski, Zdzisław. "Fundamentals of Heat and Mass Transfer, Frank P Incropera,
David P DeWitt, Theodore L Bergman, Adrienne S Lavine, J. Wiley & Sons, Hoboken
NJ (2007), 997 pp." (2007): 1683-1684., Chapter 7 pg 437-446
Inputs:
battery.
h (heat transfer coefficient) [W/(m^2*K)]
As_cell (battery cell surface area) [meters^2]
H_cell (battery cell height) [meters]
T_ambient (ambient temperature) [Kelvin]
T_current (pack temperature) [Kelvin]
T_cell (battery cell temperature) [Kelvin]
heat_transfer_efficiency [unitless]
Outputs:
battery.
net_power [Watts]
Properties Used:
None
| def SUAVE.Methods.Power.Battery.pack_battery_conditions.pack_battery_conditions | ( | conditions, | |
| battery, | |||
| avionics_payload_power, | |||
| P | |||
| ) |
pack_battery_conditions.py
Created: Sep 2021, M. Clarke
Packs the results from the network into propulsion data structures.
Assumptions:
None
Source:
N/A
Inputs:
battery.
inputs.current [Amperes]
current_energy [Joules]
voltage_open_circuit [Volts]
voltage_under_load [Volts]
inputs.power_in [Watts]
max_energy [Joules]
cell_charge_throughput [Ampere-hours]
age [days]
internal_resistance [Ohms]
state_of_charge [unitless]
pack_temperature [Kelvin]
mass_properties.mass [kilograms]
cell_voltage_under_load [Volts]
cell_voltage_open_circuit [Volts]
cell_current [Amperes]
cell_temperature [Kelvin]
heat_energy_generated [Joules]
cell_joule_heat_fraction [unitless]
cell_entropy_heat_fraction [unitless]
Outputs:
conditions.propulsion.
battery_current [Amperes]
battery_energy [Joules]
battery_voltage_open_circuit [Volts]
battery_voltage_under_load [Volts]
battery_power_draw [Watts]
battery_max_aged_energy [Joules]
battery_cycle_day [unitless]
battery_internal_resistance [Ohms]
battery_state_of_charge [unitless]
battery_pack_temperature [Kelvin]
battery_efficiency [unitless]
payload_efficiency [unitless]
battery_specfic_power [Watt-hours/kilogram]
electronics_efficiency [unitless]
battery_cell_power_draw [Watts]
battery_cell_energy [Joules]
battery_cell_voltage_under_load [Volts]
battery_cell_voltage_open_circuit [Volts]
battery_cell_current [Amperes]
battery_cell_temperature [Kelvin]
battery_cell_charge_throughput [Ampere-Hours]
battery_cell_heat_energy_generated [Joules]
battery_cell_joule_heat_fraction [unitless]
battery_cell_entropy_heat_fraction [unitless]
Properties Used:
None
1.8.15