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I don't know if this question is asked before or not, I tried searching it but couldn't find the exact answer. I am modelling a single zone room using an ideal air loads system. Also tried using a actual hvac system to the same zone using Rooftop unit. Why are the annual heating/cooling loads using a hvac system less than the ideal air load system?( for eg. with ideal air loads district heating load 7.8 Mbtu and for system using rooftop unit 2.7 Mbtu). why a huge difference?

thanks,

I don't know if this question is asked before or not, I tried searching it but couldn't find the exact answer. I am modelling a single zone room using an ideal air loads system. Also tried using a actual hvac system to the same zone using Rooftop unit. Why are the annual heating/cooling loads using a hvac system less than the ideal air load system?( for eg. with ideal air loads district heating load 7.8 Mbtu and for system using rooftop unit 2.7 Mbtu). why a huge difference?

thanks,

I don't know if this question is asked before or not, I tried searching it but couldn't find the exact answer. I am modelling a single zone room using an ideal air loads system. Also tried using a actual hvac system to the same zone using Rooftop unit. Why are the annual heating/cooling loads using a hvac system less than the ideal air load system?( for eg. with ideal air loads district heating load 7.8 Mbtu and for system using rooftop unit 2.7 Mbtu). why a huge difference?

thanks,