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I have multiple buildings in a single model for a LEED Group certification. How is the baseline system type determined?

asked 2015-11-02 19:17:42 -0500

new2modeling gravatar image

updated 2015-11-09 14:12:08 -0500

I've modeled four buildings in a single file in eQUEST. They're small (the largest is 12,000 square feet), so individually would fall under system type 4 (which is how I've modeled them). The buildings will not share any systems when built. I wanted to confirm that using type 4 is correct (because I've modeled similarly-sized offices that were on opposite side of gigantic warehouses and LEED reviewers insisted on one system type 6 for the whole thing. Granted, it was still one building).

Additionally, my fan loads seem high, though my schedules and outdoor air are as they're supposed to be. Any quick suggestions on things to check, or should I expect high fan loads with system type 4 in a cooling-dominant climate?


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answered 2015-11-02 19:44:45 -0500

nickj gravatar image


I agree with your assumption that each building should be considered separately so if electricity is your baseline then system type 4 is accurate.

As for your fan loads, this could be due to excessive economizer usage if the setting is at 70-75F it really increases the fan power. What is your climate zone?


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Thanks for your response. The project is in CA Climate Zone 13, ASHRAE zone 3B.

new2modeling gravatar image new2modeling  ( 2015-11-03 11:14:49 -0500 )edit

Using system type 4, if the fan is constant volume with the control being on the coil then your fan is running at maximum the whole time while the coils are modulating. If your proposed design is a VAV system then you should expect a lot of fan energy savings. Depending on the reviewers preferences they may want the fans to modulate too rather than being on constantly during occupancy.

nickj gravatar image nickj  ( 2015-11-20 13:45:58 -0500 )edit

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Asked: 2015-11-02 19:17:42 -0500

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Last updated: Nov 02 '15