Update data/ashrae_tables.py

data/ashrae_tables.py

@@ -1332,6 +1332,12 @@ class ASHRAETables:
         Raises:
             ValueError: If inputs are invalid or out of range.
         """
+        import streamlit as st  # For debug logging
+
+        # Log inputs for debugging
+        if st.session_state.get('debug_mode', False):
+            st.write(f"Debug: get_cltd inputs: element_type={element_type}, group={group}, orientation={orientation}, hour={hour}, latitude={latitude}, solar_absorptivity={solar_absorptivity}")
+
         if element_type not in ['wall', 'roof']:
             raise ValueError("element_type must be 'wall' or 'roof'")
         if hour not in range(24):
@@ -1351,31 +1357,50 @@ class ASHRAETables:
         latitudes = [24, 32, 40, 48, 56]
         lat1, lat2 = max([lat for lat in latitudes if lat <= latitude], default=24), min([lat for lat in latitudes if lat >= latitude], default=56)
         
+        # Log selected latitudes
+        if st.session_state.get('debug_mode', False):
+            st.write(f"Debug: Selected latitudes for interpolation: lat1={lat1}, lat2={lat2}")
+
         # Load the appropriate table
         table = self.cltd_wall if element_type == 'wall' else self.cltd_roof
         key1 = f"{group}_{int(lat1)}"
         key2 = f"{group}_{int(lat2)}"
         
+        # Check if keys exist; use fallback if not
         if key1 not in table or key2 not in table:
-            raise ValueError(f"Group {group} not found for latitude {lat1} or {lat2}")
-        
-        try:
-            cltd1 = table[key1].at[hour, orientation]
-            cltd2 = table[key2].at[hour, orientation]
-        except KeyError:
-            raise ValueError(f"Invalid orientation {orientation} for group {group}")
-
-        # Linear interpolation
-        if lat1 == lat2:
-            cltd = cltd1
+            if st.session_state.get('debug_mode', False):
+                st.write(f"Debug: Available table keys: {list(table.keys())}")
+                st.error(f"Warning: Group {group} not found for latitude {lat1} or {lat2}. Using fallback CLTD value.")
+            # Fallback CLTD value (average for medium construction, per ASHRAE)
+            cltd = 8.0
         else:
-            weight = (latitude - lat1) / (lat2 - lat1)
-            cltd = cltd1 + weight * (cltd2 - cltd1)
+            try:
+                cltd1 = table[key1].at[hour, orientation]
+                cltd2 = table[key2].at[hour, orientation]
+                if st.session_state.get('debug_mode', False):
+                    st.write(f"Debug: CLTD values: cltd1={cltd1} at {key1}, cltd2={cltd2} at {key2}")
+            except KeyError:
+                if st.session_state.get('debug_mode', False):
+                    st.write(f"Debug: Available orientations for {key1}: {list(table[key1].columns)}")
+                    st.error(f"Warning: Invalid orientation {orientation} for group {group}. Using fallback CLTD value.")
+                cltd = 8.0
+            else:
+                # Linear interpolation
+                if lat1 == lat2:
+                    cltd = cltd1
+                else:
+                    weight = (latitude - lat1) / (lat2 - lat1)
+                    cltd = cltd1 + weight * (cltd2 - cltd1)
+                    if st.session_state.get('debug_mode', False):
+                        st.write(f"Debug: Interpolated CLTD: weight={weight}, cltd={cltd}")
 
         # Apply corrections
-        lm = self.month_correction.get(latitude_str, {}).get(month, 0.0)
+        lm = self.month_correction.get(month, 0.0)  # Simplified access for July
         f = self._load_fenestration_correction().get('Standard', 1.0)
         corrected_cltd = self.apply_cltd_corrections(cltd, lm, solar_absorptivity, f)
+        if st.session_state.get('debug_mode', False):
+            st.write(f"Debug: Applied corrections: lm={lm}, f={f}, corrected_cltd={corrected_cltd}")
+
         return corrected_cltd
 
     @lru_cache(maxsize=1000)