feat: Initial commit

Sources/SharedModels/RatedEnvelope.swift

@@ -0,0 +1,50 @@
+import Foundation
+
+public struct RatedEnvelope<Rating>: Equatable {
+  public var maximum: Double
+  public var minimum: Double
+  public var rated: Double
+  
+  public init(
+    maximum: Double,
+    minimum: Double,
+    rated: Double
+  ) {
+    self.maximum = maximum
+    self.minimum = minimum
+    self.rated = rated
+  }
+}
+
+// MARK: - Namespaces
+public enum StaticPressure { }
+public enum AirflowPerTon { }
+public enum AirflowLimits { }
+
+// MARK: - Static Pressures
+public typealias RatedStaticPressures = RatedEnvelope<StaticPressure>
+extension RatedStaticPressures {
+  public init() {
+    self.init(maximum: 0.8, minimum: 0.3, rated: 0.5)
+  }
+}
+
+// MARK: - Airflow Per Ton
+public typealias RatedAirflowPerTon = RatedEnvelope<AirflowPerTon>
+extension RatedAirflowPerTon {
+  public init() {
+    self.init(maximum: 500, minimum: 350, rated: 400)
+  }
+}
+
+// MARK: - Airflow Limits
+public typealias RatedAirflowLimits = RatedEnvelope<AirflowLimits>
+extension RatedAirflowLimits {
+  public init(tons: CoolingCapacity, using airflowPerTon: RatedAirflowPerTon = .init()) {
+    self.init(
+      maximum: airflowPerTon.maximum * tons.rawValue,
+      minimum: airflowPerTon.minimum * tons.rawValue,
+      rated: airflowPerTon.rated * tons.rawValue
+    )
+  }
+}