Update data/ashrae_tables.py

data/ashrae_tables.py

@@ -430,10 +430,16 @@ class ASHRAETables:
 
     def _load_color_correction(self) -> Dict[str, float]:
         """
-        Load color correction factors for CLTD values.
-        Returns: Dictionary of correction factors for different colors.
+        Load solar absorptivity correction factors based on ASHRAE Handbook—Fundamentals (2017).
+        Returns: Dictionary mapping solar absorptivity values to correction factors.
         """
-        return {"Dark": 0.0, "Medium": -1.0, "Light": -2.0}
+        return {
+            0.3: 0.85,   # Light surfaces
+            0.45: 0.925, # Light to Medium surfaces
+            0.6: 1.00,   # Medium surfaces
+            0.75: 1.075, # Medium to Dark surfaces
+            0.9: 1.15    # Dark surfaces
+        }
 
     def _load_month_correction(self) -> Dict[str, float]:
         """