Hi All,
How can i model DCV for a laboratory building with 100%
fresh air ie no recirculation.

Since there is no return air path here so HVAC consultant says that
CO2 sensors will be placed in the occupied zones between 3 to 6ft, and
fresh air ie supply air will be modulated based on CO2 ppm
differential of outside and zone air.

But if when i tried to do it by making OA control method as DCV zone
sensors in OA and economizer tab in Air size system HVAC i am getting
75% reduction in my cooling energy which is unimaginable.

I look forward for any response.

Thanks
Sambhav.