Add room system for ventilation loss calculation

ventilation.py

@@ -0,0 +1,46 @@
+from dataclasses import dataclass
+from enum import Enum, auto
+
+
+class RoomKind(Enum):
+    # Wet rooms
+    OPEN_KITCHEN = auto()
+    KITCHEN = auto()
+    TOILET = auto()
+    OTHER_WET = auto()
+
+    # dry rooms
+    LIVING_ROOM = auto()
+    OTHER_DRY = auto()
+
+
+# https://belglas.com/wp-content/uploads/2016/04/ventilatiedocumentresidentieel.pdf
+_RANGES = {
+    RoomKind.OPEN_KITCHEN: (75, float("inf")),
+    RoomKind.KITCHEN: (50, 75),
+    RoomKind.TOILET: (25, 25),
+    RoomKind.OTHER_WET: (50, 75),
+    RoomKind.LIVING_ROOM: (75, 150),
+    RoomKind.OTHER_DRY: (25, 72),
+}
+
+
+def _clamp(x, low, high):
+    return min(max(x, low), high)
+
+
+@dataclass
+class Room:
+    kind: RoomKind
+    area: float
+
+    @property
+    def is_wet(self) -> bool:
+        return self.kind not in {RoomKind.LIVING_ROOM, RoomKind.OTHER_DRY}
+
+    @property
+    def flow_rate(self) -> float:
+        if self.kind == RoomKind.TOILET:
+            return 25
+        rate = 3.6 * self.area
+        return _clamp(rate, *_RANGES[self.kind])