Update app/internal_loads.py

app/internal_loads.py

@@ -597,6 +597,7 @@ def display_ventilation_tab():
         # Get building type for default values
         building_type = st.session_state.project_data["building_info"].get("building_type")
         default_building_data = DEFAULT_BUILDING_INTERNALS.get(building_type, DEFAULT_BUILDING_INTERNALS["Other"])
+        default_ventilation_rate = default_building_data.get("ventilation_rate", 1.0)  # L/s·m²
         
         # System type selection (outside form)
         system_type = st.selectbox(
@@ -640,12 +641,12 @@ def display_ventilation_tab():
             # Type-specific inputs
             if system_type == "AirChanges/Hour":
                 design_flow_rate = st.number_input(
-                    "Design Flow Rate (ACH)",
+                    "Design Flow Rate (L/s·m²)",
                     min_value=0.1,
                     max_value=50.0,
-                    value=float(editor_state.get("design_flow_rate", default_building_data.get("ventilation_rate", 1.0))),
+                    value=float(editor_state.get("design_flow_rate", default_ventilation_rate)),
                     format="%.2f",
-                    help="Air change rate in air changes per hour."
+                    help="Ventilation rate in liters per second per square meter."
                 )
                 ventilation_type = st.selectbox(
                     "Ventilation Type",
@@ -691,12 +692,12 @@ def display_ventilation_tab():
                 latent_effectiveness = 0.0
             elif system_type == "Balanced Flow":
                 design_flow_rate = st.number_input(
-                    "Design Flow Rate (m³/s)",
+                    "Design Flow Rate (L/s·m²)",
                     min_value=0.0,
-                    max_value=100.0,
-                    value=float(editor_state.get("design_flow_rate", 0.5)),
+                    max_value=50.0,
+                    value=float(editor_state.get("design_flow_rate", default_ventilation_rate)),
                     format="%.2f",
-                    help="Balanced supply and exhaust flow rate in cubic meters per second."
+                    help="Balanced supply and exhaust flow rate in liters per second per square meter."
                 )
                 fan_pressure_rise = st.number_input(
                     "Fan Pressure Rise (Pa)",
@@ -724,12 +725,12 @@ def display_ventilation_tab():
                 latent_effectiveness = 0.0
             elif system_type == "Heat Recovery":
                 design_flow_rate = st.number_input(
-                    "Design Flow Rate (m³/s)",
+                    "Design Flow Rate (L/s·m²)",
                     min_value=0.0,
-                    max_value=100.0,
-                    value=float(editor_state.get("design_flow_rate", 0.5)),
+                    max_value=50.0,
+                    value=float(editor_state.get("design_flow_rate", default_ventilation_rate)),
                     format="%.2f",
-                    help="Balanced supply and exhaust flow rate in cubic meters per second."
+                    help="Balanced supply and exhaust flow rate in liters per second per square meter."
                 )
                 fan_pressure_rise = st.number_input(
                     "Fan Pressure Rise (Pa)",
@@ -858,6 +859,7 @@ def display_infiltration_tab():
         # Get building type for default values
         building_type = st.session_state.project_data["building_info"].get("building_type")
         default_building_data = DEFAULT_BUILDING_INTERNALS.get(building_type, DEFAULT_BUILDING_INTERNALS["Other"])
+        default_air_change_rate = default_building_data.get("air_change_rate", 0.3)  # ACH
         
         # System type selection (outside form)
         system_type = st.selectbox(
@@ -904,7 +906,7 @@ def display_infiltration_tab():
                     "Design Flow Rate (ACH)",
                     min_value=0.0,
                     max_value=10.0,
-                    value=float(editor_state.get("design_flow_rate", default_building_data.get("air_change_rate", 0.3))),
+                    value=float(editor_state.get("design_flow_rate", default_air_change_rate)),
                     format="%.2f",
                     help="Air change rate in air changes per hour."
                 )
@@ -1427,10 +1429,8 @@ def display_ventilation_table(ventilation_systems: List[Dict[str, Any]]):
         cols[0].write(system["name"])
         cols[1].write(system.get("system_type", "Unknown"))
         cols[2].write(f"{system.get('area', 0):.1f}")
-        if system.get("system_type") == "AirChanges/Hour":
-            rate_info = f"{system.get('design_flow_rate', 0):.2f} ACH"
-        elif system.get("system_type") in ["Balanced Flow", "Heat Recovery"]:
-            rate_info = f"{system.get('design_flow_rate', 0):.2f} m³/s"
+        if system.get("system_type") in ["AirChanges/Hour", "Balanced Flow", "Heat Recovery"]:
+            rate_info = f"{system.get('design_flow_rate', 0):.2f} L/s·m²"
         else:
             rate_info = f"{system.get('opening_effectiveness', 0):.2f} %"
         cols[3].write(rate_info)