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I've modeled my baseline with the appropriate oversizing ratios for heating and cooling (1.25 and 1.15, respectively). Do I keep this oversizing in my proposed model?

asked 2015-10-29 11:54:45 -0500

new2modeling
63 ●3

updated 2017-05-08 15:47:02 -0500

__AmirRoth__

4436 ●5 ●17 http://bleedinggreenna...

I am using eQUEST. The model is for office spaces that have yet to find tenants. The proposed model is based on the minimum requirements of the lease for tenant fit-outs. In this case, tenants are required to have equipment with a minimum SEER value of 15. I can model this just fine, but do I need to keep the oversizing that I had in the baseline (since there is no specified equipment and therefore no specified capacities)?

Thanks,

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answered 2015-10-29 12:50:56 -0500

Daniel
648 ●3 ●10 http://www.sustainabil...

My understanding is that where components of the Proposed design are not specified or designed, these components should meet the requirements of the Baseline building. In this case, that would mean that the sizing factors in the Proposed should match the sizing factors in the Reference. See ASHRAE 90.1-2007, Table G3.1.10 (Proposed) HVAC Systems. "Where no heating/cooling system exists or no heating/cooling system has been specified ... System characteristics shall be identical to the system modeled in the baseline building".

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I suspected as much, thanks for confirming.

new2modeling ( 2015-10-29 13:51:06 -0500 )edit

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Last updated: Oct 29 '15

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I've modeled my baseline with the appropriate oversizing ratios for heating and cooling (1.25 and 1.15, respectively). Do I keep this oversizing in my proposed model? edit