Update app/main.py

app/main.py

@@ -279,6 +279,19 @@ class HVACCalculator:
         
         return True, "Valid load."
     
+    def parse_latitude(self, latitude: Any) -> float:
+        """Parse latitude from string or float to float value."""
+        try:
+            if isinstance(latitude, (int, float)):
+                return float(latitude)
+            if isinstance(latitude, str):
+                lat_str = latitude.strip().upper().replace('N', '').replace('S', '')
+                return float(lat_str)
+            raise ValueError("Invalid latitude format")
+        except (ValueError, AttributeError) as e:
+            st.error(f"Invalid latitude: {latitude}. Using default 32.0.")
+            return 32.0  # Default to 32N
+    
     def display_internal_loads(self):
         st.title("Internal Loads")
         
@@ -775,7 +788,7 @@ class HVACCalculator:
                         group=wall.wall_group,
                         orientation=wall.orientation.value,
                         hour=design_loads['design_hour'],
-                        latitude=float(outdoor_conditions['latitude'].replace('N', '')),
+                        latitude=self.parse_latitude(outdoor_conditions['latitude']),
                         solar_absorptivity=wall.solar_absorptivity,
                         month=outdoor_conditions['month'].lower()
                     ),
@@ -803,7 +816,7 @@ class HVACCalculator:
                         group=roof.roof_group,
                         orientation=roof.orientation.value,
                         hour=design_loads['design_hour'],
-                        latitude=float(outdoor_conditions['latitude'].replace('N', '')),
+                        latitude=self.parse_latitude(outdoor_conditions['latitude']),
                         solar_absorptivity=roof.solar_absorptivity,
                         month=outdoor_conditions['month'].lower()
                     ),
@@ -847,11 +860,11 @@ class HVACCalculator:
                     'shading_device': window.shading_device,
                     'shading_coefficient': window.shading_coefficient,
                     'scl': self.cooling_calculator.ashrae_tables.get_scl(
-                        latitude=float(outdoor_conditions['latitude'].replace('N', '')),
+                        latitude=self.parse_latitude(outdoor_conditions['latitude']),
                         month=outdoor_conditions['month'].lower(),
                         orientation=window.orientation.value,
                         hour=design_loads['design_hour']
-                    ),
+                    ) * 3.15459,  # Convert Btu/h-ft² to W/m²
                     'load': load_dict['total'] / 1000
                 })
             
@@ -905,11 +918,11 @@ class HVACCalculator:
                     'drapery_type': skylight.drapery_type if hasattr(skylight, 'drapery_type') else 'None',
                     'shading_coefficient': skylight.shading_coefficient,
                     'scl': self.cooling_calculator.ashrae_tables.get_scl(
-                        latitude=float(outdoor_conditions['latitude'].replace('N', '')),
+                        latitude=self.parse_latitude(outdoor_conditions['latitude']),
                         month=outdoor_conditions['month'].lower(),
                         orientation='Horizontal',
                         hour=design_loads['design_hour']
-                    ),
+                    ) * 3.15459,  # Convert Btu/h-ft² to W/m²
                     'load': load_dict['total'] / 1000
                 })