Add chem solution atmos heating and cooling (#17854)

Content.Server/Atmos/EntitySystems/AtmosphereSystem.cs

@@ -31,7 +31,7 @@ public sealed partial class AtmosphereSystem : SharedAtmosphereSystem
     [Dependency] private readonly TransformSystem _transformSystem = default!;
     [Dependency] private readonly TileSystem _tile = default!;
 
-    private const float ExposedUpdateDelay = 1f;
+    public const float ExposedUpdateDelay = 1f;
     private float _exposedTimer = 0f;
 
     public override void Initialize()

Content.Server/Chemistry/Components/SolutionManager/SolutionGasHeatConductivityComponent.cs

@@ -0,0 +1,22 @@
+namespace Content.Server.Chemistry.Components.SolutionManager;
+
+/// <summary>
+/// Lets the solution conduct heat to/from atmos gases.
+/// </summary>
+[RegisterComponent]
+public sealed class SolutionGasHeatConductivityComponent : Component
+{
+    /// <summary>
+    /// Solution that conducts heat.
+    /// </summary>
+    [ViewVariables(VVAccess.ReadWrite)]
+    [DataField("solution")]
+    public string Solution { get; set; } = "default";
+
+    /// <summary>
+    /// The heat conductivity between the gas and solution.
+    /// </summary>
+    [ViewVariables(VVAccess.ReadWrite)]
+    [DataField("wattsPerKelvin")]
+    public float WattsPerKelvin = 1;
+}

Content.Server/Chemistry/EntitySystems/SolutionGasHeatConductivitySystem.cs

@@ -0,0 +1,37 @@
+using Content.Server.Atmos.EntitySystems;
+using Content.Server.Chemistry.Components.SolutionManager;
+using Robust.Shared.Timing;
+
+namespace Content.Server.Chemistry.EntitySystems;
+
+public sealed class SolutionGasHeatConductivitySystem : EntitySystem
+{
+    [Dependency] private readonly IGameTiming _gameTiming = default!;
+    [Dependency] private readonly AtmosphereSystem _atmosphereSystem = default!;
+    [Dependency] private readonly SolutionContainerSystem _solutionContainerSystem = default!;
+
+    /// <inheritdoc/>
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<SolutionGasHeatConductivityComponent, AtmosExposedUpdateEvent>(AtmosUpdate);
+    }
+
+    private void AtmosUpdate(EntityUid uid, SolutionGasHeatConductivityComponent solutionGasHeatConductivity, ref AtmosExposedUpdateEvent args)
+    {
+        if (!_solutionContainerSystem.TryGetSolution(uid, solutionGasHeatConductivity.Solution, out var solution) || solution.Volume == 0)
+            return;
+
+        var heatDifferenceKelvin = args.GasMixture.Temperature - solution.Temperature;
+        if (Math.Abs(heatDifferenceKelvin) < 0.5)
+            return; // close enough
+
+        var thermalEnergyTransferWatts = heatDifferenceKelvin * solutionGasHeatConductivity.WattsPerKelvin;
+        var thermalEnergyTransferJoules = thermalEnergyTransferWatts * AtmosphereSystem.ExposedUpdateDelay;
+
+        _solutionContainerSystem.AddThermalEnergy(uid, solution, thermalEnergyTransferJoules);
+        var gasHeatCapacity = _atmosphereSystem.GetHeatCapacity(args.GasMixture);
+        args.GasMixture.Temperature += gasHeatCapacity == 0 ? 0 : -thermalEnergyTransferJoules / gasHeatCapacity;
+    }
+}

Resources/Prototypes/Entities/Effects/puddle.yml

@@ -142,6 +142,9 @@
     - type: SolutionContainerManager
       solutions:
         puddle: { maxVol: 1000 }
+    - type: AtmosExposed
+    - type: SolutionGasHeatConductivity
+      solution: puddle
     - type: Puddle
     - type: Appearance
     - type: EdgeSpreader

Resources/Prototypes/Entities/Objects/Consumable/Drinks/drinks.yml

@@ -30,6 +30,9 @@
     solution: drink
   - type: DrainableSolution
     solution: drink
+  - type: AtmosExposed
+  - type: SolutionGasHeatConductivity
+    solution: drink
   - type: UserInterface
     interfaces:
     - key: enum.TransferAmountUiKey.Key

Resources/Prototypes/Entities/Objects/Consumable/Drinks/drinks_cans.yml

@@ -34,6 +34,9 @@
     solution: drink
   - type: DrainableSolution
     solution: drink
+  - type: AtmosExposed
+  - type: SolutionGasHeatConductivity
+    solution: drink
   - type: Appearance
   - type: GenericVisualizer
     visuals:

Resources/Prototypes/Entities/Objects/Consumable/Drinks/drinks_cups.yml

@@ -21,6 +21,9 @@
   - type: SolutionTransfer
     canChangeTransferAmount: true
     maxTransferAmount: 10
+  - type: AtmosExposed
+  - type: SolutionGasHeatConductivity
+    solution: drink
   - type: UserInterface
     interfaces:
     - key: enum.TransferAmountUiKey.Key

Resources/Prototypes/Entities/Objects/Consumable/Drinks/drinks_special.yml

@@ -22,6 +22,9 @@
     canChangeTransferAmount: true
   - type: Spillable
     solution: drink
+  - type: AtmosExposed
+  - type: SolutionGasHeatConductivity
+    solution: drink
   - type: Sprite
     sprite: Objects/Consumable/Drinks/shaker.rsi
     state: icon

Resources/Prototypes/Entities/Objects/Consumable/Drinks/trash_drinks.yml

@@ -33,6 +33,9 @@
     solution: drink
   - type: DrainableSolution
     solution: drink
+  - type: AtmosExposed
+  - type: SolutionGasHeatConductivity
+    solution: drink
   - type: UserInterface
     interfaces:
     - key: enum.TransferAmountUiKey.Key

Resources/Prototypes/Entities/Objects/Specific/chemistry.yml

@@ -40,6 +40,9 @@
     solution: beaker
   - type: SolutionTransfer
     canChangeTransferAmount: true
+  - type: AtmosExposed
+  - type: SolutionGasHeatConductivity
+    solution: beaker
   - type: UserInterface
     interfaces:
     - key: enum.TransferAmountUiKey.Key
@@ -131,6 +134,9 @@
     solution: beaker
   - type: SolutionTransfer
     canChangeTransferAmount: true
+  - type: AtmosExposed
+  - type: SolutionGasHeatConductivity
+    solution: beaker
   - type: UserInterface
     interfaces:
     - key: enum.TransferAmountUiKey.Key