Ideal air load system in HVAC system list

I used ideal air load system in HVAC system list in energy simulation. Could you please explain what ideal air load system is exactly? I should report it to my Prof. but I dont know what it is?

TNX

Hi,@Masoud Ideal air load system is one function of energyplus。You can refer to this website
https://bigladdersoftware.com/epx/docs/8-0/input-output-reference/page-032.html#zonehvacidealloadsairsystem