补充test_mql PNVO焓流诊断与系数校正

tests/test_peng_robinson.py

@@ -25,6 +25,20 @@ class PengRobinsonTest(unittest.TestCase):
             delta=pressure * 1.0e-12,
         )
 
+    def test_helium_residual_enthalpy_is_small_at_atmosphere(self) -> None:
+        self.assertAlmostEqual(
+            HELIUM_PR.residual_specific_enthalpy(101_300.0, 298.15),
+            17.834,
+            delta=0.01,
+        )
+
+    def test_helium_residual_enthalpy_captures_high_pressure_departure(self) -> None:
+        self.assertAlmostEqual(
+            HELIUM_PR.residual_specific_enthalpy(13_839_965.0, 287.7322),
+            11953.9,
+            delta=0.1,
+        )
+
     def test_air_reference_remains_available_for_other_models(self) -> None:
         z = AIR_PR.compressibility_factor(101_325.0, 300.0)
         density = AIR_PR.density(101_325.0, 300.0)