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I am using OpenStudio 1.14, and have created a baseline and proposed building, where the proposed building has a lower outdoor air flow rate by adjusting the following variable: OS:DesignSpecification:OutdoorAir Outdoor Air Flow per Floor Area

I ran a baseline and proposed building for all 16 California climate zones.

• Heating energy decreased in all 16 climate zones
• Cooling energy increased in all climate zones except 11, 13 and 14.

The HVAC system is modeled as a single zone package unit.

I would have expected both heating and cooling energy to decrease with a decrease in ventilation? Any explanation for this?

Thanks, Ryan

I am using OpenStudio 1.14, and have created a baseline and proposed building, where the proposed building has a lower outdoor air flow rate by adjusting the following variable: OS:DesignSpecification:OutdoorAir OS:DesignSpecification:OutdoorAir > Outdoor Air Flow per Floor Area Area.

I ran a baseline and proposed building for all 16 California climate zones.

• Heating energy decreased in all 16 climate zones
• Cooling energy increased in all climate zones except 11, 13 and 14.

The HVAC system is modeled as a single zone package unit.

I would have expected both heating and cooling energy to decrease with a decrease in ventilation? Any explanation for this?

I am using OpenStudio 1.14, and have created a baseline and proposed building, where the proposed building has a lower outdoor air flow rate by adjusting the following variable: OS:DesignSpecification:OutdoorAir > Outdoor Air Flow per Floor Area.

I ran a baseline and proposed building for all 16 California climate zones.

• Heating energy decreased in all 16 climate zones
• Cooling energy increased in all climate zones except 11, 13 and 14.

The HVAC system is modeled as a single zone package unit.

I would have expected both heating and cooling energy to decrease with a decrease in ventilation? Any explanation for this?