56 lines
1.7 KiB
Python
56 lines
1.7 KiB
Python
from __future__ import annotations
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from PythonModels.core.base import DynamicComponent
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from PythonModels.core.medium import IdealGasMedium, ThermodynamicProperties
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from PythonModels.core.ports import PortState
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from PythonModels.core.state import VolumeState
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class Cylinder(DynamicComponent):
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"""Python port of ModelicaModels.Mycylinder."""
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def __init__(
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self,
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name: str,
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medium: IdealGasMedium,
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V: float = 0.01,
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p0: float = 35e6,
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T0: float = 300.0,
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) -> None:
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super().__init__(name=name)
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self.medium = medium
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self.V = V
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m0 = p0 * V / (medium.R_gas * T0)
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U0 = m0 * medium.specific_internal_energy(T0)
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self.state = VolumeState(m=m0, U=U0)
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self.port_b = PortState()
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def get_state_vector(self) -> list[float]:
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return self.state.as_vector()
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def set_state_vector(self, values: list[float]) -> None:
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self.state = VolumeState.from_vector(values)
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def properties(self) -> ThermodynamicProperties:
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props = self.medium.properties_from_mU(self.state.m, self.state.U, self.V)
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self.port_b.p = props.p
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self.port_b.h_outflow = props.h
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return props
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def derivatives_from_connection(
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self,
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*,
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connected_h: float,
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port_m_flow: float,
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internal_h: float,
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) -> VolumeState:
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inlet_h = self.connection_inlet_enthalpy(
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port_m_flow=port_m_flow,
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connected_h=connected_h,
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internal_h=internal_h,
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)
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return self.derivatives(inlet_h, port_m_flow)
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def derivatives(self, inlet_h: float, m_flow: float) -> VolumeState:
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return VolumeState(m=m_flow, U=m_flow * inlet_h)
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