This group of building descriptors relate to HVAC systems at the zone level. For purposes that have a baseline building there is not a one-to-one relationship between HVAC components in the proposed design and the baseline building since the baseline building system is determined from building type, size, and heating source.
This group of building descriptors relates to HVAC systems at the zone level. There is not a one-to-one relationship between HVAC components in the proposed design and the baseline building since the baseline building system is determined from building type, size, and climate zone. Additions and alterations should follow the same requirements stated for new construction proposed designs and new construction baseline buildings; unless otherwise noted in the descriptor. For unenclosed spaces such as parking garages, crawlspaces and attics, refer to Section 2.4.3 of this manual for modeling requirements.
G3.2 New Construction/Major Alterations
This group of building descriptors relates to HVAC systems at the zone level. There is not a one-to-one relationship between HVAC components in the proposed design and the baseline building since the baseline building system is determined from building type, size, and climate zone. Additions and alterations subject to 90.1 G3.2 should follow the same requirements stated for new construction proposed designs and new construction baseline buildings, unless otherwise noted in the descriptor. For unenclosed spaces such as parking garages, crawlspaces and attics, refer to Section 2.4.3 of this manual for modeling requirements.
G3.3 Minor Alterations
This group of building descriptors relates to HVAC systems at the zone level. There is a one-to-one relationship between HVAC components in the proposed design and the baseline building because the baseline building system type is modeled the same as the proposed with the only exception being if the proposed design includes variable refrigerant flow heat pumps or single-zone systems with electric resistance heat, then air source heat pumps are modeled in the baseline design. This exception is intended for single zone systems with electric resistance coils and not single zone systems served by central hot water systems.