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NC-2009 EAc1:Optimize Energy Performance

Baseline HVAC Equip Vs. Proposed HVAC Equip

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Question: Does the HVAC system for the baseline have to be the same type as the proposed design HVAC equipment? (ie. could you use a VAV roof top with electric reheat on the base and for the proposed use geothermal system.)

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Thu, 09/08/2011 - 14:42

The Baseline Case is determined by Table G3.3.1 in ASHRAE 90.1 Appendix G. It depends on factors like the building use (residential vs commercial), size (area and number of floors) and heating source (fossil fuel vs electric) The situation you describe is not possible. An all-electric heat pump system gets to compare against an all-electric baseline case, but depending on the size of your building, the baseline case system type would be heat pumps, or VAV with fan powered boxes and electric resistance heating.

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