pytanksim.classes.storagetankclasses
Contains classes which store the properties of the storage tanks.
The StorageTank and SorbentTank classes are part of this module.
Classes
Stores the properties of the storage tank. |
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Stores properties of a fluid storage tank filled with sorbents. |
Module Contents
- class pytanksim.classes.storagetankclasses.StorageTank(stored_fluid: pytanksim.classes.fluidsorbentclasses.StoredFluid, aluminum_mass: float = 0, carbon_fiber_mass: float = 0, steel_mass: float = 0, vent_pressure: float = None, min_supply_pressure: float = 100000.0, thermal_resistance: float = 0, surface_area: float = 0, heat_transfer_coefficient: float = 0, volume: float = None, set_capacity: float = None, full_pressure: float = None, empty_pressure: float = None, full_temperature: float = None, empty_temperature: float = None, full_quality: float = 1, empty_quality: float = 1)
Stores the properties of the storage tank.
It also has methods to calculate useful quantities such as tank dormancy given a constant heat leakage rate, the internal energy of the fluid being stored at various conditions, etc.
- volume
Internal volume of the storage tank (m^3).
- Type:
float
- stored_fluid
Object to calculate the thermophysical properties of the fluid being stored.
- Type:
- aluminum_mass
The mass of aluminum making up the tank walls (kg). The default is 0.
- Type:
float, optional
- carbon_fiber_mass
The mass of carbon fiber making up the tank walls (kg). The default is 0.
- Type:
float, optional
- steel_mass
The mass of steel making up the tank walls (kg). The default is 0.
- Type:
float, optional
- vent_pressure
The pressure (Pa) at which the fluid being stored must be vented. The default is None. If None, the value will be taken as the maximum value where the CoolProp backend can calculate the properties of the fluid being stored.
- Type:
float, optional
- min_supply_pressure
The minimum supply pressure (Pa) for discharging simulations.The default is 1E5.
- Type:
float, optional
- thermal_resistance
The thermal resistance of the tank walls (K/W). The default is 0. If 0, the value will not be considered in simulations. If the arguments ‘surface_area’ and ‘heat_transfer’ are passed, ‘thermal_resistance’ will be calculated based on those two arguments as long as the user does not pass a value to ‘thermal_resistance’.
- Type:
float, optional
- surface_area
The surface area of the tank that is in contact with the environment (m^2). The default is 0.
- Type:
float, optional
- heat_transfer_coefficient
The heat transfer coefficient of the tank surface (W/(m^2 K)). The default is 0.
- Type:
float, optional
- Initialize a StorageTank object.
- capacity(p: float, T: float, q: float = 0, unit: str = 'mol') float
Return the amount of fluid stored in the tank at given conditions.
- Parameters:
p (float) – Pressure (Pa).
T (float) – Temperature (K).
q (float, optional) – Vapor quality of the fluid being stored. Can vary between 0 and 1. The default is 0.
unit (str, optional) – Unit of the capacity to be returned. Valid units are “mol” and “kg”. The default is “mol”.
- Returns:
Amount of fluid stored.
- Return type:
float
- capacity_bulk(p: float, T: float, q: float = 0, unit: str = 'mol') float
Calculate the amount of bulk fluid in the tank.
- Parameters:
p (float) – Pressure (Pa).
T (float) – Temperature (K).
q (float, optional) – Vapor quality of the fluid being stored. Can vary between 0 and 1. The default is 0.
unit (str, optional) – Unit of the capacity to be returned. Valid units are “mol” and “kg”. The default is “mol”.
- Returns:
Amount of bulk fluid stored.
- Return type:
float
- find_quality_at_saturation_capacity(T: float, capacity: float) float
Find vapor quality at the given temperature and capacity.
- Parameters:
T (float) – Temperature (K)
capacity (float) – Amount of fluid in the tank (moles).
- Returns:
Vapor quality of the fluid being stored. This is assuming that the fluid is on the saturation line.
- Return type:
float
- internal_energy(p: float, T: float, q: float = 1) float
Calculate the internal energy of the fluid inside of the tank.
- Parameters:
p (float) – Pressure (Pa).
T (float) – Temperature (K).
q (float, optional) – Vapor quality of the fluid being stored. The default is 1.
- Returns:
Internal energy of the fluid being stored (J).
- Return type:
float
- conditions_at_capacity_temperature(cap: float, T: float, p_guess: float, q_guess: float) scipy.optimize.OptimizeResult
Find conditions corresponding to a given capacity and temperature.
- Parameters:
cap (float) – Amount of fluid inside the tank (moles).
T (float) – Temperature (K).
p_guess (float) – Initial guess for pressure value (Pa) to be optimized.
q_guess (float) – Initial guess for vaport quality value to be optimized.
- Returns:
The optimization result represented as a OptimizeResult object. The relevant attribute for this method is x, the solution array. x[0] contains the pressure value and x[1] contains the vapor quality value.
- Return type:
OptimizeResult
- conditions_at_capacity_pressure(cap: float, p: float, T_guess: float, q_guess: float) scipy.optimize.OptimizeResult
Find conditions corresponding to a given capacity and temperature.
- Parameters:
cap (float) – Amount of fluid inside the tank (moles).
P (float) – Pressure (Pa).
T_guess (float) – Initial guess for temperature value (K) to be optimized.
q_guess (float) – Initial guess for vaport quality value to be optimized.
- Returns:
The optimization result represented as a OptimizeResult object. The relevant attribute for this package is x, the solution array. x[0] contains the temperature value and x[1] contains the vapor quality value.
- Return type:
scipy.optimize.OptimizeResult
- calculate_dormancy(p: float, T: float, heating_power: float, q: float = 0) pandas.DataFrame
Calculate dormancy time given a constant heating rate.
- Parameters:
p (float) – Initial tank pressure (Pa).
T (float) – Initial tank temperature (K).
heating_power (float) – The heating power going into the tank during parking (W).
q (float, optional) – Initial vapor quality of the tank. The default is 0 (pure liquid).
- Returns:
Pandas dataframe containing calculation conditions and results. Each key stores a floating point number. The dictionary keys and their respective values are:
”init pressure”: initial pressure
”init temperature”: initial temperature
”init quality”: initial vapor quality
”dormancy time”: time until tank needs to be vented in seconds
”final temperature”: temperature of the tank as venting begins
”final quality”: vapor quality at the time of venting
”final pressure”: pressure at the time of venting
”capacity error”: error between final and initial capacity
”total energy change”: difference in internal energy between the initial and final conditions
”solid heat capacity contribution”: the amount of heat absorbed by the tank walls
- Return type:
pd.DataFrame
- class pytanksim.classes.storagetankclasses.SorbentTank(sorbent_material: pytanksim.classes.fluidsorbentclasses.SorbentMaterial, aluminum_mass: float = 0, carbon_fiber_mass: float = 0, steel_mass: float = 0, vent_pressure: float = None, min_supply_pressure: float = 100000.0, thermal_resistance: float = 0, surface_area: float = 0, heat_transfer_coefficient: float = 0, volume: float = None, set_capacity: float = None, full_pressure: float = None, empty_pressure: float = None, full_temperature: float = None, empty_temperature: float = None, full_quality: float = 1, empty_quality: float = 1, set_sorbent_fill: float = 1)
Bases:
StorageTank
Stores properties of a fluid storage tank filled with sorbents.
- volume
Internal volume of the storage tank (m^3).
- Type:
float
- sorbent_material
An object storing the properties of the sorbent material used in the tank.
- Type:
- aluminum_mass
The mass of aluminum making up the tank walls (kg). The default is 0.
- Type:
float, optional
- carbon_fiber_mass
The mass of carbon fiber making up the tank walls (kg). The default is 0.
- Type:
float, optional
- steel_mass
The mass of steel making up the tank walls (kg). The default is 0.
- Type:
float, optional
- vent_pressure
Maximum pressure at which the tank has to be vented (Pa). The default is None.
- Type:
float, optional
- min_supply_pressure
The minimum supply pressure (Pa) for discharging simulations. The default is 1E5.
- Type:
float, optional
- thermal_resistance
The thermal resistance of the tank walls (K/W). The default is 0. If 0, the value will not be considered in simulations. If the arguments ‘surface_area’ and ‘heat_transfer’ are passed, ‘thermal_resistance’ will be calculated based on those two arguments as long as the user does not pass a value to ‘thermal_resistance’.
- Type:
float, optional
- surface_area
Outer surface area of the tank in contact with the environment (m^2). The default is 0.
- Type:
float, optional
- heat_transfer_coefficient
The heat transfer coefficient of the tank surface (W/(m^2 K)). The default is 0.
- Type:
float, optional
Initialize a SorbentTank object.
- Parameters:
sorbent_material (SorbentMaterial) – An object storing the properties of the sorbent material used in the tank.
aluminum_mass (float, optional) – The mass of aluminum making up the tank walls (kg). The default is 0.
carbon_fiber_mass (float, optional) – The mass of carbon fiber making up the tank walls (kg). The default is 0.
steel_mass (float, optional) – The mass of steel making up the tank walls (kg). The default is 0.
vent_pressure (float, optional) – Maximum pressure at which the tank has to be vented (Pa). The default is None.
min_supply_pressure (float, optional) – The minimum supply pressure (Pa) for discharging simulations. The default is 1E5.
thermal_resistance (float, optional) – The thermal resistance of the tank walls (K/W). The default is 0. If 0, the value will not be considered in simulations. If the arguments ‘surface_area’ and ‘heat_transfer’ are passed, ‘thermal_resistance’ will be calculated based on those two arguments as long as the user does not pass a value to ‘thermal_resistance’.
surface_area (float, optional) – Outer surface area of the tank in contact with the environment (m^2). The default is 0.
heat_transfer_coefficient (float, optional) – The heat transfer coefficient of the tank surface (W/(m^2 K)). The default is 0.
volume (float, optional) – Internal volume of the storage tank (m^3). The default is None. This value is required unless the set capacity and operating conditions are defined, in which case the volume is calculated from the capacity and operating conditions.
set_capacity (float, optional) – Set internal capacity of the storage tank (mol). The default is None. If specified, this will override the user-specified tank volume.
full_pressure (float, optional) – Pressure (Pa) of the tank when it is considered full. The default is None.
empty_pressure (float, optional) – Pressure (Pa) of the tank when it is considered empty. The default is None.
full_temperature (float, optional) – Temperature (K) of the tank when it is considered full. The default is None.
empty_temperature (float, optional) – Temperature (K) of the tank when it is considered empty. The default is None.
full_quality (float, optional) – Vapor quality of the tank when it is considered full. The default is 1 (Gas).
empty_quality (float, optional) – Vapor quality of the tank when it is considered empty. The default is 1 (Gas).
set_sorbent_fill (float, optional) – Ratio of tank volume filled with sorbent. The default is 1 (completely filled with sorbent).
- Returns:
Object which stores various properties of a storage tank containing sorbents. It also has some useful methods related to the tank, most notably dormancy calculation.
- Return type:
- bulk_fluid_volume(p: float, T: float) float
Calculate the volume of bulk fluid inside of the tank.
- Parameters:
p (float) – Pressure (Pa).
T (float) – Temperature(K).
- Returns:
Bulk fluid volume within the tank (m^3).
- Return type:
float
- capacity(p: float, T: float, q: float = 0) float
Return the amount of fluid stored in the tank at given conditions.
- Parameters:
p (float) – Pressure (Pa).
T (float) – Temperature (K).
q (float, optional) – Vapor quality of the fluid being stored. Can vary between 0 and 1. The default is 0.
- Returns:
Amount of fluid stored (moles).
- Return type:
float
- capacity_bulk(p: float, T: float, q: float = 0) float
Calculate the amount of bulk fluid in the tank.
- Parameters:
p (float) – Pressure (Pa).
T (float) – Temperature (K).
q (float, optional) – Vapor quality of the fluid being stored. Can vary between 0 and 1. The default is 0.
- Returns:
Amount of bulk fluid stored (moles).
- Return type:
float
- internal_energy(p: float, T: float, q: float = 1) float
Calculate the internal energy of the fluid inside of the tank.
- Parameters:
p (float) – Pressure (Pa).
T (float) – Temperature (K).
q (float, optional) – Vapor quality of the fluid being stored. The default is 1.
- Returns:
Internal energy of the fluid being stored (J).
- Return type:
float
- internal_energy_sorbent(p: float, T: float, q: float = 1) float
Calculate the internal energy of the adsorbed fluid in the tank.
- Parameters:
p (float) – Pressure (Pa).
T (float) – Temperature (K).
q (float, optional) – Vapor quality of the fluid being stored. The default is 1.
- Returns:
Internal energy of the adsorbed fluid in the tank (J).
- Return type:
float
- internal_energy_bulk(p: float, T: float, q: float = 1) float
Calculate the internal energy of the bulk fluid in the tank.
- Parameters:
p (float) – Pressure (Pa).
T (float) – Temperature (K).
q (float, optional) – Vapor quality of the fluid being stored. The default is 1.
- Returns:
Internal energy of the bulk fluid in the tank (J).
- Return type:
float
- find_quality_at_saturation_capacity(T: float, capacity: float) float
Find vapor quality at the given temperature and capacity.
- Parameters:
T (float) – Temperature (K)
capacity (float) – Amount of fluid in the tank (moles).
- Returns:
Vapor quality of the fluid being stored. This is assuming that the fluid is on the saturation line.
- Return type:
float
- find_temperature_at_saturation_quality(q: float, cap: float) scipy.optimize.OptimizeResult
Find temperature at a given capacity and vapor quality value.
- Parameters:
q (float) – Vapor quality. Can vary between 0 and 1.
cap (float) – Amount of fluid stored in the tank (moles).
- Returns:
The optimization result represented as a OptimizeResult object. The relevant attribute for this function is x, the optimized temperature value.
- Return type:
scipy.optimize.OptimizeResult
- calculate_dormancy(p: float, T: float, heating_power: float, q: float = 0) pandas.DataFrame
Calculate dormancy time given a constant heating rate.
- Parameters:
p (float) – Initial tank pressure (Pa).
T (float) – Initial tank temperature (K).
heating_power (float) – The heating power going into the tank during parking (W).
q (float, optional) – Initial vapor quality of the tank. The default is 0 (pure liquid).
- Returns:
Pandas dataframe containing calculation conditions and results. Each key stores a floating point number. The dictionary keys and their respective values are:
”init pressure”: initial pressure
”init temperature”: initial temperature
”init quality”: initial vapor quality
”dormancy time”: time until tank needs to be vented in seconds
”final temperature”: temperature of the tank as venting begins
”final quality”: vapor quality at the time of venting
”final pressure”: pressure at the time of venting
”capacity error”: error between final and initial capacity
”total energy change”: difference in internal energy between the initial and final conditions
”sorbent energy contribution”: the amount of heat taken by the adsorbed phase via desorption
”bulk energy contribution”: the amount of heat absorbed by the bulk phase
”immersion heat contribution”: how much heat has been absorbed by un-immersing the sorbent material in the fluid
”solid heat capacity contribution”: the amount of heat absorbed by the tank walls
- Return type:
pd.DataFrame