Update project structure and configurations

crates/solver/tests/chiller_air_glycol_integration.rs

@@ -589,9 +589,9 @@ fn test_screw_energy_balance() {
     // At this operating point:
     // h_suc=400 kJ/kg, h_dis=440 kJ/kg, h_eco=260 kJ/kg
     // ṁ_suc=1.2 kg/s, ṁ_eco=0.144 kg/s, ṁ_total=1.344 kg/s
-    // Energy in = 1.2×400000 + 0.144×260000 + W/0.92
-    // Energy out = 1.344×440000
-    // W = (1.344×440000 - 1.2×400000 - 0.144×260000) × 0.92
+    // First law (fluid side): ṁ_suc×h_suc + ṁ_eco×h_eco + W_fluid = ṁ_total×h_dis
+    // W_fluid = W_shaft × η_mech
+    // W_shaft = (ΔH) / η_mech
 
     let m_suc = 1.2_f64;
     let m_eco = 0.144_f64;
@@ -601,21 +601,21 @@ fn test_screw_energy_balance() {
     let h_eco = 260_000.0_f64;
     let eta_mech = 0.92_f64;
 
-    let w_expected = (m_total * h_dis - m_suc * h_suc - m_eco * h_eco) * eta_mech;
+    let delta_h = m_total * h_dis - m_suc * h_suc - m_eco * h_eco;
+    let w_shaft = delta_h / eta_mech;
+    let w_fluid = w_shaft * eta_mech; // == delta_h
     println!(
-        "Expected shaft power: {:.0} W = {:.1} kW",
-        w_expected,
-        w_expected / 1000.0
+        "Shaft power: {:.0} W = {:.1} kW, Fluid power: {:.0} W",
+        w_shaft, w_shaft / 1000.0, w_fluid
     );
 
-    // Verify that this W closes the energy balance (residual[2] ≈ 0)
-    let state = vec![m_suc, m_eco, h_suc, h_dis, w_expected];
+    // Verify: W_shaft closes the energy balance via residual[2]
+    // State layout: [m_suc, m_eco, w_shaft] — enthalpies come from ports, not state
+    let state = vec![m_suc, m_eco, w_shaft];
     let mut residuals = vec![0.0; 5];
     comp.compute_residuals(&state, &mut residuals).unwrap();
 
-    // residual[2] = energy_in - energy_out
-    // = (ṁ_suc×h_suc + ṁ_eco×h_eco + W/η) - ṁ_total×h_dis
-    // Should be exactly 0 if W was computed correctly
+    // residual[2] = (ṁ_suc×h_suc + ṁ_eco×h_eco + W_shaft×η) - ṁ_total×h_dis
     println!("Energy balance residual: {:.4} J/s", residuals[2]);
     assert!(
         residuals[2].abs() < 1.0,