Early explorations of calculation primitives

interfaces.py

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+from abc import ABC, abstractmethod
+from dataclasses import dataclass
+
+
+@dataclass
+class Layer:
+    thermal_coefficient: float
+    thickness: float
+
+    @property
+    def R(self):
+        return self.thickness / self.thermal_coefficient
+
+
+@dataclass
+class Interface(ABC):
+    name: str
+    area: float
+
+    @property
+    @abstractmethod
+    def U(self) -> float: ...
+
+
+@dataclass
+class LayeredInterface(Interface):
+    layers: list[Layer]
+    r_surface_1: float
+    r_surface_2: float
+
+    @property
+    def U(self) -> float:
+        R_layers = sum(layer.R for layer in self.layers)
+        R = self.r_surface_1 + R_layers + self.r_surface_2
+        return 1 / R
+
+
+@dataclass
+class FixedUInterface(Interface):
+    u_value: float
+
+    @property
+    def U(self) -> float:
+        return self.u_value