Accurate air load calculations have a direct effect on energy efficiency, occupant comfort, indoor air quality (IAQ), and building's durability. Moreover, the load calculation is the first step of the iterative HVAC design procedure, as a full HVAC design involves much more than just the load calculation. The loads modeled by the heating and cooling load calculation process will dictate the equipment selection and duct design to deliver conditioned air to the rooms of the building.

The ideal load in higher because it used more conservative assumptions compared to the actual loads.

Hope this helps answer your question.

Professor Yehia Khalil

Yale University

USA

Hi! I am not sure which software you are using to calculate the loads but could be a case of cumulative vs concurrent loads. If you add up all the peak zone loads (as commonly reported by simulation software), they will always be much higher than the HVAC system peak concurrent load value.

Hope that helps,

Minu Agarwal

Doctoral Assistant, EPFL