修复test_mql事件后积分步长控制

tests/test_amesim_pneumatic_components.py

@@ -79,6 +79,31 @@ class AmesimPneumaticComponentsTest(unittest.TestCase):
         )
         self.assertAlmostEqual(volume.port_a.p, volume.port_b.p)
 
+    def test_volume_applies_amesim_heat_exchange_to_energy_derivative(self) -> None:
+        volume = AmesimPneumaticVolume.from_liters(
+            name="heated_chamber",
+            volume_liters=15.0,
+            p0=100000.0,
+            T0=300.0,
+            heat_transfer_coefficient=1500.0,
+            heat_transfer_area=0.7,
+            external_temperature_k=293.15,
+        )
+        props = volume.properties()
+
+        derivative = volume.derivatives_from_two_connections(
+            port_a_m_flow=0.0,
+            connected_h_a=props.h,
+            port_b_m_flow=0.0,
+            connected_h_b=props.h,
+            internal_h=props.h,
+        )
+
+        self.assertAlmostEqual(
+            derivative.U,
+            1500.0 * 0.7 * (293.15 - 300.0),
+        )
+
     def test_variable_volume_tracks_external_volume(self) -> None:
         volume = AmesimVariablePneumaticVolume.from_liters(
             name="pn_c1_8",