jaxprop.bicubic.bicubic_interpolation module

class jaxprop.bicubic.bicubic_interpolation.FluidBicubic(fluid_name: str, backend: str, h_min: float, h_max: float, p_min: float, p_max: float, N_h: int, N_p: int, N_p_sat: int = 60, mixture_ratio: float = None, metastable_phase: str = None, coarse_step: int = 10, gradient_method: str = 'central', identifier: str = None, table_name: str = None, table_dir: str = 'fluid_tables')

Bases: Module

Fluid model using bicubic property interpolation on an enthalpy-pressure grid.

Workflow:

• On construction, attempts to load a precomputed table from disk.

• If not found, generates the table with finite-difference derivatives, saves it to disk, and stores it in memory.

• On get_props, performs bicubic interpolation at the requested state.

Table generation uses forward finite differences for first and mixed derivatives

Parameters:

fluid_namestr

Fluid identifier for CoolProp.

backendstr

CoolProp backend string.

h_min, h_maxfloat

Min/max enthalpy [J/kg].

p_min, p_maxfloat

Min/max pressure [Pa].

N_h, N_pint

Number of grid points in h and p.

coarse_stepint

Number of points to skip when determining the initial guess during 2D inverse interpolations

table_namestr, optional

Name of the table pickle file (default: “{fluid_name}_{N_h}x{N_p}”).

table_dirstr, optional

Directory for saving/loading table pickle (default: “fluid_tables”).

identifierstr, optional

Tag stored in the returned FluidState objects.

Methods

get_state
get_state_saturation

N_h: int

N_p: int

N_p_sat: int

PROPERTY_CALCULATORS = {9: <function FluidBicubic.<lambda>>, 10: <function FluidBicubic.<lambda>>, 18: <function FluidBicubic.<lambda>>, 20: <function FluidBicubic.<lambda>>, 22: <function FluidBicubic.<lambda>>, 26: <function FluidBicubic.<lambda>>, 30: <function FluidBicubic.<lambda>>, 32: <function FluidBicubic.<lambda>>}

backend: str

coarse_step: int

critical_point: dict

delta_h: float

delta_logP: float

delta_logP_sat: float

fluid_name: str

get_state(input_type, val1, val2)

get_state_saturation(pressure)

grad_method: str

h_max: float

h_min: float

h_vals: Array

identifier: str

logP_sat_vals: Array

logP_vals: Array

metadata: dict

metastable_phase: str

mixture_ratio: float

p_max: float

p_min: float

table: dict

table_dir: str

table_name: str

jaxprop.bicubic.bicubic_interpolation.compute_bicubic_coefficients(value, grad_h, grad_logP, grad_hlogP, delta_h, delta_logP)