Define startup and shutdown temperatures in version upgrade for previous releases.

Author: taylorbrown75

deploy/runtime/versions.lk

@@ -122,6 +122,28 @@ version_upgrade{'2024.12.12'} = define() {
 			variable_name_change('h_tank_in', 'h_tank');
 			value('is_h_tank_fixed', 1, 'Set default tank sizing to fixed height');
 		}
+		
+		if(oldvalue('T_shutdown') == null)
+		{
+			message('We added the ability to set the field startup and shutdown temperatures, which were previously set internally by SAM.'
+				' The startup and shutdown temperatures will be set to the previous SAM-calculated value. ', 'warning');
+			
+			T_loop_out = oldvalue('T_loop_out');
+			T_loop_in = oldvalue('T_loop_in_des');
+			
+			T_startup_min = T_loop_in;
+			if(T_loop_out > 600)
+			{
+				T_startup_min = T_loop_out - 70.0;
+			}
+			T_startup = max(T_startup_min, 0.67 * T_loop_in + 0.33 * T_loop_out);
+			T_shutdown = T_startup;
+			value('T_startup', T_startup, 'Field startup temperature set using the previous SAM version method.');
+			value('T_shutdown', T_shutdown, 'Field shutdown temperature set equal to startup.');
+		}
+		
+		
+		
 	}
 
 	// Linear Fresnel Model Changes