FAHU's Fan power and Cooling capacities

Manivel Natarajan

LEEDuser Basic Member

0 thumbs up

March 8, 2017

Hi All, In my project, proposed building has DX split unit HVAC System. Fan power and cooling capacities have been modeled as per the indoor unit DX schedules.Further, fresh air is provided through FAHU's. For the baseline, indoor units fan power has been calculated as per Table G3.1.2.9, appendix G. Please clarify how I can include the FAHU’s fan power and cooling capacities in base case simulation. The proposed FAHU's is supplying fresh air for the both base case and proposed case. If I consider, FAHU’s fan power and cooling capacities in the proposed case, proposed energy consumption is coming very high. I am unable to get energy savings even my indoor unit fan power and cooling capacities are less compared with baseline fan power calculation. Kindly clarify how I could manage for the FAHU's fan power and cooling capacities for both base and proposed simulation model. Thanks in advance for your help.

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Wed, 03/08/2017 - 16:13

You model the Proposed systems as designed using the actual capacities and fan power in alignment with the project documents or the installed equipment if known. You model the Baseline according to Appendix G. It is unclear from above what Baseline system type you are dealing with. In general you would not have a separate FAHU in the Baseline system. Systems 1-4 map the Proposed systems, Systems 5-8 are modeled per floor. Any G3.1.1 exceptions that apply must be modeled. If you provide some more specifics on the Baseline system I might be able to get more specific about how to model the Baseline system.