PythonModels/systems/test_mql.py

@@ -4981,6 +4981,34 @@ class TestMqlSystem:
                 f"{p4_port1_far_node_alias}.port_4 does not use "
                 f"{p4_port1_next_orifice_resistance_orifice_alias}"
             )
+        p4_port1_next_orifice_resistance_chamber_spec = (
+            chamber_segment_for_outlet_node(
+                p4_port1_next_orifice_resistance_node.alias
+            )
+        )
+        p4_port1_next_orifice_resistance_chamber_inlet_line = (
+            self.pnl0001_assembly.lines[
+                p4_port1_next_orifice_resistance_chamber_spec.inlet_line_alias
+            ]
+        )
+        p4_port1_next_orifice_resistance_chamber = self.network.components[
+            p4_port1_next_orifice_resistance_chamber_spec.volume_alias
+        ]
+        p4_port1_next_orifice_resistance_chamber_outlet_line = (
+            self.pnl0001_assembly.lines[
+                p4_port1_next_orifice_resistance_chamber_spec.outlet_line_alias
+            ]
+        )
+        p4_port1_next_orifice_resistance_chamber_inlet_orifice = (
+            self.pneumatic_assembly.fixed_orifices[
+                p4_port1_next_orifice_resistance_chamber_spec.inlet_orifice_alias
+            ]
+        )
+        p4_port1_next_orifice_resistance_chamber_outlet_orifice = (
+            self.pneumatic_assembly.fixed_orifices[
+                p4_port1_next_orifice_resistance_chamber_spec.outlet_orifice_alias
+            ]
+        )
         p4_port3_remote_orifice = self.pneumatic_assembly.variable_orifices[
             p4_port3_remote_neighborhood.port_4.orifice_alias
         ]
@@ -5111,6 +5139,27 @@ class TestMqlSystem:
             raise TypeError(
                 f"{p4_port1_next_orifice_resistance_orifice_alias} is not an AMESim pneumatic orifice"
             )
+        if not isinstance(
+            p4_port1_next_orifice_resistance_chamber,
+            AmesimPneumaticVolume,
+        ):
+            raise TypeError(
+                f"{p4_port1_next_orifice_resistance_chamber_spec.volume_alias} is not an AMESim pneumatic volume"
+            )
+        if not isinstance(
+            p4_port1_next_orifice_resistance_chamber_inlet_orifice,
+            AmesimPneumaticOrifice,
+        ):
+            raise TypeError(
+                f"{p4_port1_next_orifice_resistance_chamber_spec.inlet_orifice_alias} is not an AMESim pneumatic orifice"
+            )
+        if not isinstance(
+            p4_port1_next_orifice_resistance_chamber_outlet_orifice,
+            AmesimPneumaticOrifice,
+        ):
+            raise TypeError(
+                f"{p4_port1_next_orifice_resistance_chamber_spec.outlet_orifice_alias} is not an AMESim pneumatic orifice"
+            )
         if not isinstance(p4_bridge_primary_chamber, AmesimPneumaticVolume):
             raise TypeError(
                 f"{p4_bridge_primary_chamber_alias} is not an AMESim pneumatic volume"
@@ -5165,6 +5214,24 @@ class TestMqlSystem:
                 p4_port1_next_orifice_resistance_orifice=(
                     p4_port1_next_orifice_resistance_orifice
                 ),
+                p4_port1_next_orifice_resistance_chamber_inlet_line=(
+                    p4_port1_next_orifice_resistance_chamber_inlet_line
+                ),
+                p4_port1_next_orifice_resistance_chamber=(
+                    p4_port1_next_orifice_resistance_chamber
+                ),
+                p4_port1_next_orifice_resistance_chamber_outlet_line=(
+                    p4_port1_next_orifice_resistance_chamber_outlet_line
+                ),
+                p4_port1_next_orifice_resistance_chamber_inlet_orifice=(
+                    p4_port1_next_orifice_resistance_chamber_inlet_orifice
+                ),
+                p4_port1_next_orifice_resistance_chamber_outlet_orifice=(
+                    p4_port1_next_orifice_resistance_chamber_outlet_orifice
+                ),
+                p4_port1_next_orifice_resistance_chamber_spec=(
+                    p4_port1_next_orifice_resistance_chamber_spec
+                ),
                 p4_bridge_node=p4_bridge_node,
                 p4_bridge_primary_line=p4_bridge_primary_line,
                 p4_bridge_primary_chamber=p4_bridge_primary_chamber,

PythonModels/systems/test_mql_closure.py

@@ -220,6 +220,12 @@ class TestMqlPn3P4NodeChamberSegmentComponents:
     p4_port1_next_orifice_resistance_node: TestMqlPneumaticNode3
     p4_port1_next_orifice_resistance_line: AmesimPnl0003Pipe
     p4_port1_next_orifice_resistance_orifice: AmesimPneumaticOrifice
+    p4_port1_next_orifice_resistance_chamber_inlet_line: AmesimPnl0001Pipe
+    p4_port1_next_orifice_resistance_chamber: AmesimPneumaticVolume
+    p4_port1_next_orifice_resistance_chamber_outlet_line: AmesimPnl0001Pipe
+    p4_port1_next_orifice_resistance_chamber_inlet_orifice: AmesimPneumaticOrifice
+    p4_port1_next_orifice_resistance_chamber_outlet_orifice: AmesimPneumaticOrifice
+    p4_port1_next_orifice_resistance_chamber_spec: TestMqlPneumaticChamberSegmentSpec
     p4_bridge_node: TestMqlPneumaticNode4
     p4_bridge_primary_line: AmesimPnl0001Pipe
     p4_bridge_primary_chamber: AmesimPneumaticVolume
@@ -299,6 +305,9 @@ class TestMqlPn3P4NodeChamberSegmentSnapshot:
     p4_port1_next_orifice_output_line: ThermodynamicProperties
     p4_port1_next_orifice_resistance_line_port_1: ThermodynamicProperties
     p4_port1_next_orifice_resistance_line_port_2: ThermodynamicProperties
+    p4_port1_next_orifice_resistance_chamber_inlet_line: ThermodynamicProperties
+    p4_port1_next_orifice_resistance_chamber: ThermodynamicProperties
+    p4_port1_next_orifice_resistance_chamber_outlet_line: ThermodynamicProperties
     p4_bridge_primary_line: ThermodynamicProperties
     p4_bridge_primary_chamber: ThermodynamicProperties
     p4_port1_remote_orifice_line_port_1: ThermodynamicProperties
@@ -379,6 +388,10 @@ class TestMqlPn3P4NodeChamberSegmentSnapshot:
     p4_port1_next_orifice_resistance_node_to_line_flow: float
     p4_port1_next_orifice_resistance_line_center_flow: float
     p4_port1_next_orifice_resistance_to_p4_flow: float
+    p4_port1_next_orifice_resistance_chamber_inlet_boundary_to_line_flow: float
+    p4_port1_next_orifice_resistance_chamber_inlet_line_to_chamber_flow: float
+    p4_port1_next_orifice_resistance_chamber_outlet_node_to_line_flow: float
+    p4_port1_next_orifice_resistance_chamber_outlet_line_to_chamber_flow: float
     p4_bridge_to_port1_next_line_flow: float
     p4_bridge_chamber_to_line_flow: float
     p4_bridge_node_to_primary_line_flow: float
@@ -492,11 +505,14 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             *self.components.p4_port1_next_orifice_line.get_state_vector(),
             *self.components.p4_port1_next_orifice_output_line.get_state_vector(),
             *self.components.p4_port1_next_orifice_resistance_line.get_state_vector(),
+            *self.components.p4_port1_next_orifice_resistance_chamber_inlet_line.get_state_vector(),
+            *self.components.p4_port1_next_orifice_resistance_chamber.get_state_vector(),
+            *self.components.p4_port1_next_orifice_resistance_chamber_outlet_line.get_state_vector(),
         ]
 
     def apply_state_vector(self, values: list[float]) -> None:
-        if len(values) != 106:
+        if len(values) != 112:
-            raise ValueError("PN3/P4 node chamber segment state vector requires one hundred six values")
+            raise ValueError("PN3/P4 node chamber segment state vector requires one hundred twelve values")
         self.components.inlet_line.set_state_vector(values[:2])
         self.components.volume.set_state_vector(values[2:4])
         self.components.outlet_line.set_state_vector(values[4:6])
@@ -541,7 +557,10 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         self.components.p4_port3_next_resistance_chamber_outlet_line.set_state_vector(values[94:96])
         self.components.p4_port1_next_orifice_line.set_state_vector(values[96:100])
         self.components.p4_port1_next_orifice_output_line.set_state_vector(values[100:102])
-        self.components.p4_port1_next_orifice_resistance_line.set_state_vector(values[102:])
+        self.components.p4_port1_next_orifice_resistance_line.set_state_vector(values[102:106])
+        self.components.p4_port1_next_orifice_resistance_chamber_inlet_line.set_state_vector(values[106:108])
+        self.components.p4_port1_next_orifice_resistance_chamber.set_state_vector(values[108:110])
+        self.components.p4_port1_next_orifice_resistance_chamber_outlet_line.set_state_vector(values[110:])
 
     def snapshot(
         self,
@@ -591,6 +610,15 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         p4_port1_next_orifice_resistance_line_port_2 = (
             self.components.p4_port1_next_orifice_resistance_line.properties_2()
         )
+        p4_port1_next_orifice_resistance_chamber_inlet_line = (
+            self.components.p4_port1_next_orifice_resistance_chamber_inlet_line.properties()
+        )
+        p4_port1_next_orifice_resistance_chamber = (
+            self.components.p4_port1_next_orifice_resistance_chamber.properties()
+        )
+        p4_port1_next_orifice_resistance_chamber_outlet_line = (
+            self.components.p4_port1_next_orifice_resistance_chamber_outlet_line.properties()
+        )
         p4_bridge_primary_line = self.components.p4_bridge_primary_line.properties()
         p4_bridge_primary_chamber = self.components.p4_bridge_primary_chamber.properties()
         p4_port1_remote_orifice_line_port_1 = (
@@ -982,6 +1010,32 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
                 port_2_temperature_k=p4_port1_next_orifice_line_port_1.T,
             )
         )
+        p4_port1_next_orifice_resistance_chamber_inlet_boundary_to_line_flow = (
+            self.components.p4_port1_next_orifice_resistance_chamber_inlet_line.resistance_mass_flow(
+                port_1_pressure_pa=resistance_boundary.p,
+                port_1_temperature_k=resistance_boundary.T,
+            )
+        )
+        p4_port1_next_orifice_resistance_chamber_inlet_line_to_chamber_flow = (
+            self._line_to_chamber_flow(
+                line=p4_port1_next_orifice_resistance_chamber_inlet_line,
+                chamber=p4_port1_next_orifice_resistance_chamber,
+                orifice=self.components.p4_port1_next_orifice_resistance_chamber_inlet_orifice,
+            )
+        )
+        p4_port1_next_orifice_resistance_chamber_outlet_node_to_line_flow = (
+            self.components.p4_port1_next_orifice_resistance_chamber_outlet_line.resistance_mass_flow(
+                port_1_pressure_pa=p4_port1_next_orifice_resistance_line_port_1.p,
+                port_1_temperature_k=p4_port1_next_orifice_resistance_line_port_1.T,
+            )
+        )
+        p4_port1_next_orifice_resistance_chamber_outlet_line_to_chamber_flow = (
+            self._line_to_chamber_flow(
+                line=p4_port1_next_orifice_resistance_chamber_outlet_line,
+                chamber=p4_port1_next_orifice_resistance_chamber,
+                orifice=self.components.p4_port1_next_orifice_resistance_chamber_outlet_orifice,
+            )
+        )
         p4_port1_next_orifice_node_balance = (
             self.components.p4_port1_next_orifice_node.balance(
                 port_2_temperature_k=p4_port1_next_orifice_line_port_1.T,
@@ -1027,8 +1081,15 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
                 port_1_mass_flow_g_s=(
                     p4_port1_next_orifice_resistance_node_to_next_flow * 1.0e3
                 ),
-                port_3_enthalpy_flow_w=0.0,
+                port_3_enthalpy_flow_w=self._enthalpy_flow_from_node(
-                port_3_mass_flow_g_s=0.0,
+                    flow_kg_s=p4_port1_next_orifice_resistance_chamber_outlet_node_to_line_flow,
+                    node_h=p4_port1_next_orifice_resistance_line_port_1.h,
+                    connected_h=p4_port1_next_orifice_resistance_chamber_outlet_line.h,
+                ),
+                port_3_mass_flow_g_s=(
+                    p4_port1_next_orifice_resistance_chamber_outlet_node_to_line_flow
+                    * 1.0e3
+                ),
             )
         )
         p4_port1_next_orifice_resistance_node_to_line_flow = (
@@ -1391,6 +1452,15 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             p4_port1_next_orifice_resistance_line_port_2=(
                 p4_port1_next_orifice_resistance_line_port_2
             ),
+            p4_port1_next_orifice_resistance_chamber_inlet_line=(
+                p4_port1_next_orifice_resistance_chamber_inlet_line
+            ),
+            p4_port1_next_orifice_resistance_chamber=(
+                p4_port1_next_orifice_resistance_chamber
+            ),
+            p4_port1_next_orifice_resistance_chamber_outlet_line=(
+                p4_port1_next_orifice_resistance_chamber_outlet_line
+            ),
             p4_bridge_primary_line=p4_bridge_primary_line,
             p4_bridge_primary_chamber=p4_bridge_primary_chamber,
             p4_port1_remote_orifice_line_port_1=p4_port1_remote_orifice_line_port_1,
@@ -1511,6 +1581,18 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             p4_port1_next_orifice_resistance_to_p4_flow=(
                 p4_port1_next_orifice_resistance_to_p4_flow
             ),
+            p4_port1_next_orifice_resistance_chamber_inlet_boundary_to_line_flow=(
+                p4_port1_next_orifice_resistance_chamber_inlet_boundary_to_line_flow
+            ),
+            p4_port1_next_orifice_resistance_chamber_inlet_line_to_chamber_flow=(
+                p4_port1_next_orifice_resistance_chamber_inlet_line_to_chamber_flow
+            ),
+            p4_port1_next_orifice_resistance_chamber_outlet_node_to_line_flow=(
+                p4_port1_next_orifice_resistance_chamber_outlet_node_to_line_flow
+            ),
+            p4_port1_next_orifice_resistance_chamber_outlet_line_to_chamber_flow=(
+                p4_port1_next_orifice_resistance_chamber_outlet_line_to_chamber_flow
+            ),
             p4_bridge_to_port1_next_line_flow=p4_bridge_to_port1_next_line_flow,
             p4_bridge_chamber_to_line_flow=p4_bridge_chamber_to_line_flow,
             p4_bridge_node_to_primary_line_flow=p4_bridge_node_to_primary_line_flow,
@@ -1884,6 +1966,59 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
         p4_port1_next_orifice_resistance_orifice.port_b.m_flow = -snapshot.p4_port1_next_orifice_resistance_to_p4_flow
         p4_port1_next_orifice_resistance_orifice.port_b.h_outflow = snapshot.p4_port1_far_primary_line.h
 
+        resistance_chamber_spec = (
+            self.components.p4_port1_next_orifice_resistance_chamber_spec
+        )
+        p4_port1_next_orifice_resistance_chamber = (
+            self.components.p4_port1_next_orifice_resistance_chamber
+        )
+        p4_port1_next_orifice_resistance_chamber_inlet_port = self._port(
+            p4_port1_next_orifice_resistance_chamber,
+            resistance_chamber_spec.volume_inlet_port,
+        )
+        p4_port1_next_orifice_resistance_chamber_outlet_port = self._port(
+            p4_port1_next_orifice_resistance_chamber,
+            resistance_chamber_spec.volume_outlet_port,
+        )
+        TestMqlPnl0001PairChamberSegmentClosure._write_line_side(
+            self,
+            line=self.components.p4_port1_next_orifice_resistance_chamber_inlet_line,
+            line_properties=(
+                snapshot.p4_port1_next_orifice_resistance_chamber_inlet_line
+            ),
+            node_properties=snapshot.resistance_boundary,
+            node_to_line_flow=(
+                snapshot.p4_port1_next_orifice_resistance_chamber_inlet_boundary_to_line_flow
+            ),
+            line_to_chamber_flow=(
+                snapshot.p4_port1_next_orifice_resistance_chamber_inlet_line_to_chamber_flow
+            ),
+            orifice=self.components.p4_port1_next_orifice_resistance_chamber_inlet_orifice,
+            orifice_boundary_port=resistance_chamber_spec.inlet_orifice_boundary_port,
+            orifice_volume_port=resistance_chamber_spec.inlet_orifice_volume_port,
+            chamber_port=p4_port1_next_orifice_resistance_chamber_inlet_port,
+            chamber_properties=snapshot.p4_port1_next_orifice_resistance_chamber,
+        )
+        TestMqlPnl0001PairChamberSegmentClosure._write_line_side(
+            self,
+            line=self.components.p4_port1_next_orifice_resistance_chamber_outlet_line,
+            line_properties=(
+                snapshot.p4_port1_next_orifice_resistance_chamber_outlet_line
+            ),
+            node_properties=snapshot.p4_port1_next_orifice_resistance_line_port_1,
+            node_to_line_flow=(
+                snapshot.p4_port1_next_orifice_resistance_chamber_outlet_node_to_line_flow
+            ),
+            line_to_chamber_flow=(
+                snapshot.p4_port1_next_orifice_resistance_chamber_outlet_line_to_chamber_flow
+            ),
+            orifice=self.components.p4_port1_next_orifice_resistance_chamber_outlet_orifice,
+            orifice_boundary_port=resistance_chamber_spec.outlet_orifice_boundary_port,
+            orifice_volume_port=resistance_chamber_spec.outlet_orifice_volume_port,
+            chamber_port=p4_port1_next_orifice_resistance_chamber_outlet_port,
+            chamber_properties=snapshot.p4_port1_next_orifice_resistance_chamber,
+        )
+
         p4_bridge_primary_line = self.components.p4_bridge_primary_line
         p4_bridge_primary_line.port_1.p = snapshot.p4_bridge_primary_chamber.p
         p4_bridge_primary_line.port_1.m_flow = snapshot.p4_bridge_chamber_to_line_flow
@@ -2593,6 +2728,61 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             port_2_m_flow=-snapshot.p4_port1_next_orifice_resistance_to_p4_flow,
             connected_h_2=snapshot.p4_port1_far_primary_line.h,
         )
+        p4_port1_next_orifice_resistance_chamber_inlet_derivative = (
+            self.components.p4_port1_next_orifice_resistance_chamber_inlet_line.derivatives_from_connections(
+                port_1_m_flow=(
+                    snapshot.p4_port1_next_orifice_resistance_chamber_inlet_boundary_to_line_flow
+                ),
+                connected_h_1=snapshot.resistance_boundary.h,
+                port_2_m_flow=(
+                    -snapshot.p4_port1_next_orifice_resistance_chamber_inlet_line_to_chamber_flow
+                ),
+                connected_h_2=snapshot.p4_port1_next_orifice_resistance_chamber.h,
+            )
+        )
+        p4_port1_next_orifice_resistance_chamber_spec = (
+            self.components.p4_port1_next_orifice_resistance_chamber_spec
+        )
+        p4_port1_next_orifice_resistance_chamber = (
+            self.components.p4_port1_next_orifice_resistance_chamber
+        )
+        p4_port1_next_orifice_resistance_fixed_chamber_derivative = (
+            p4_port1_next_orifice_resistance_chamber.derivatives_from_two_connections(
+                port_a_m_flow=self._port(
+                    p4_port1_next_orifice_resistance_chamber,
+                    "port_1",
+                ).m_flow,
+                connected_h_a=(
+                    snapshot.p4_port1_next_orifice_resistance_chamber_inlet_line.h
+                    if p4_port1_next_orifice_resistance_chamber_spec.volume_inlet_port
+                    == "port_1"
+                    else snapshot.p4_port1_next_orifice_resistance_chamber_outlet_line.h
+                ),
+                port_b_m_flow=self._port(
+                    p4_port1_next_orifice_resistance_chamber,
+                    "port_2",
+                ).m_flow,
+                connected_h_b=(
+                    snapshot.p4_port1_next_orifice_resistance_chamber_inlet_line.h
+                    if p4_port1_next_orifice_resistance_chamber_spec.volume_inlet_port
+                    == "port_2"
+                    else snapshot.p4_port1_next_orifice_resistance_chamber_outlet_line.h
+                ),
+                internal_h=snapshot.p4_port1_next_orifice_resistance_chamber.h,
+            )
+        )
+        p4_port1_next_orifice_resistance_chamber_outlet_derivative = (
+            self.components.p4_port1_next_orifice_resistance_chamber_outlet_line.derivatives_from_connections(
+                port_1_m_flow=(
+                    snapshot.p4_port1_next_orifice_resistance_chamber_outlet_node_to_line_flow
+                ),
+                connected_h_1=snapshot.p4_port1_next_orifice_resistance_line_port_1.h,
+                port_2_m_flow=(
+                    -snapshot.p4_port1_next_orifice_resistance_chamber_outlet_line_to_chamber_flow
+                ),
+                connected_h_2=snapshot.p4_port1_next_orifice_resistance_chamber.h,
+            )
+        )
         return [
             *inlet_derivative.as_vector(),
             *chamber_derivative.as_vector(),
@@ -2647,6 +2837,9 @@ class TestMqlPn3P4NodeChamberSegmentClosure:
             *p4_port1_next_orifice_output_derivative.as_vector(),
             *p4_port1_next_orifice_resistance_derivative_1.as_vector(),
             *p4_port1_next_orifice_resistance_derivative_2.as_vector(),
+            *p4_port1_next_orifice_resistance_chamber_inlet_derivative.as_vector(),
+            *p4_port1_next_orifice_resistance_fixed_chamber_derivative.as_vector(),
+            *p4_port1_next_orifice_resistance_chamber_outlet_derivative.as_vector(),
         ]
 
 

tests/test_test_mql_pnl0001_segment.py

@@ -488,8 +488,28 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
             closure.components.p4_port1_next_orifice_resistance_orifice.name,
             "pn_morifice_15",
         )
-        self.assertEqual(len(closure.initial_state_vector()), 106)
+        self.assertEqual(
-        self.assertEqual(len(rhs), 106)
+            closure.components.p4_port1_next_orifice_resistance_chamber_inlet_line.name,
+            "pneumatic_98",
+        )
+        self.assertEqual(
+            closure.components.p4_port1_next_orifice_resistance_chamber.name,
+            "pn_general_chamber_2",
+        )
+        self.assertEqual(
+            closure.components.p4_port1_next_orifice_resistance_chamber_outlet_line.name,
+            "pneumatic_99",
+        )
+        self.assertEqual(
+            closure.components.p4_port1_next_orifice_resistance_chamber_inlet_orifice.name,
+            "pn_orifice_20",
+        )
+        self.assertEqual(
+            closure.components.p4_port1_next_orifice_resistance_chamber_outlet_orifice.name,
+            "pn_orifice_21",
+        )
+        self.assertEqual(len(closure.initial_state_vector()), 112)
+        self.assertEqual(len(rhs), 112)
         self.assertAlmostEqual(
             snapshot.p4_balance.pressure_pa,
             snapshot.p4_primary_line.p,
@@ -601,6 +621,29 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
             closure.components.p4_port1_next_orifice_resistance_orifice.name,
             "pn_morifice_15",
         )
+        resistance_chamber_segment = (
+            self.system.discover_pneumatic_branch_topology().chamber_segment_specs[1]
+        )
+        self.assertEqual(
+            closure.components.p4_port1_next_orifice_resistance_chamber_spec,
+            resistance_chamber_segment,
+        )
+        self.assertEqual(
+            closure.components.p4_port1_next_orifice_resistance_chamber_inlet_line.name,
+            resistance_chamber_segment.inlet_line_alias,
+        )
+        self.assertEqual(
+            closure.components.p4_port1_next_orifice_resistance_chamber_outlet_line.name,
+            resistance_chamber_segment.outlet_line_alias,
+        )
+        self.assertEqual(
+            closure.components.p4_port1_next_orifice_resistance_chamber_inlet_orifice.name,
+            resistance_chamber_segment.inlet_orifice_alias,
+        )
+        self.assertEqual(
+            closure.components.p4_port1_next_orifice_resistance_chamber_outlet_orifice.name,
+            resistance_chamber_segment.outlet_orifice_alias,
+        )
         self.assertEqual(
             closure.components.p4_bridge_node.alias,
             port1_next_port1.remote_node_alias,
@@ -943,7 +986,8 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
         )
         self.assertAlmostEqual(
             snapshot.p4_port1_next_orifice_resistance_node_to_line_flow
-            + snapshot.p4_port1_next_orifice_resistance_node_to_next_flow,
+            + snapshot.p4_port1_next_orifice_resistance_node_to_next_flow
+            + snapshot.p4_port1_next_orifice_resistance_chamber_outlet_node_to_line_flow,
             0.0,
             delta=1.0e-12,
         )
@@ -991,14 +1035,25 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
             ),
             delta=1.0e-12,
         )
-        mass_derivative_sum = sum(rhs[index] for index in range(0, 106, 2))
+        p4_port1_next_orifice_resistance_chamber_mass_sum = (
+            rhs[106] + rhs[108] + rhs[110]
+        )
+        self.assertAlmostEqual(
+            p4_port1_next_orifice_resistance_chamber_mass_sum,
+            (
+                snapshot.p4_port1_next_orifice_resistance_chamber_inlet_boundary_to_line_flow
+                + snapshot.p4_port1_next_orifice_resistance_chamber_outlet_node_to_line_flow
+            ),
+            delta=1.0e-12,
+        )
+        mass_derivative_sum = sum(rhs[index] for index in range(0, 112, 2))
         self.assertAlmostEqual(
             mass_derivative_sum,
-            0.0,
+            snapshot.p4_port1_next_orifice_resistance_chamber_inlet_boundary_to_line_flow,
             delta=1.0e-12,
         )
 
-    def test_simulates_one_hundred_six_state_pn3_p4_node_chamber_segment(self) -> None:
+    def test_simulates_one_hundred_twelve_state_pn3_p4_node_chamber_segment(self) -> None:
         solution = self.system.simulate_pn3_p4_node_chamber_segment_from_spec(
             self.spec,
             inlet_node_pressure_pa=15.31e6,
@@ -1013,8 +1068,8 @@ class TestMqlPn3P4NodeChamberSegmentTests(unittest.TestCase):
 
         self.assertTrue(solution.success)
         self.assertEqual(len(solution.t), 3)
-        self.assertEqual(len(solution.y), 106)
+        self.assertEqual(len(solution.y), 112)
-        self.assertEqual([len(row) for row in solution.y], [3] * 106)
+        self.assertEqual([len(row) for row in solution.y], [3] * 112)
 
 
 if __name__ == "__main__":