[EnergyPlus_Support] Calculated design heating load difference

[<marko.ignjatovic1980@xxxxxxxxx>]

Hi guys,

I'm having trouble in finding the reason why there is a difference in calculated design heating load for my models. This is the problem. Both models have the same building with the same envelope and same WinterDesignDay schedules for indoor temperatures for sizing. In first model i used IdealLoadsAir system and the obtained design heating loads comply with the real buiding. But when I modeled HVAC systems, there was a great difference in calculated heating load. As we all know design heating load for zone is not dependent of HVAC systems serving it, but is function of envelope properties, interior and exterior conditions. Does any of You have  any idea what could be the cause for this difference. I double checked all common objects for both models and they are the same.

Thanks in advance

Marko

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