How does CHVAC software calculate cooling loads, and what are the differences between the CLTD and RTS methods?

CHVAC software calculates cooling loads using either the CLTD (Cooling Load Temperature Difference) method or the RTS (Radiant Time Series) method. The CLTD method is a traditional approach that estimates cooling loads based on temperature differences between indoor and outdoor air, while the RTS method is a more advanced approach that takes into account radiant heat gains and time-series data. The RTS method is considered more accurate, especially for buildings with complex geometries or high internal heat gains.