[Bldg-sim] LEED Core & Shell questions

[Wealend, Edwin]

Bill,

Response below. Hope that helps!

Regards,
Ed

Edwin Wealend
Senior Engineer
Cundall Hong Kong
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From: Bishop, Bill [mailto:bbishop at pathfinder-ea.com]
Sent: Wednesday, July 31, 2013 04:11
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] LEED Core & Shell questions

1. Should Tenant Spaces in LEED Core & Shell projects be modeled with Appendix G systems for the Baseline, and for the Proposed as well if there is no HVAC design? – Correct – no profit or loss should be claimed for the HVAC in tenant spaces
-OR- Should Tenant Spaces be modeled as “unconditioned” in both the Baseline and Proposed? (-OR- some other option?)

2. What is the intent/purpose of the requirement to model separate electric meters for lighting, plug loads and process loads in the Tenant Spaces? Should the cost from these meters be removed from the building energy cost for EAc1 savings? – To ensure you’ve applied the same internal gains for the HVAC network to deal with. Arguably you could claim fewer meters would still give you the same information, it’s just gives the LEED reviewer all the info they need.

3. IF HVAC systems are modeled in the Tenant Spaces, should this energy be assigned to separate meters as well? – Yes, particularly if you want to claim the benefit of Landlord controlled energy vs. tenant controlled energy using the Core & Shell Alternative Compliance Path (ACP) – generally worthwhile if the tenant/landlord consumption is about 50/50.

LEED Core & Shell Appendix 2<http://www.usgbc.org/resources/appendix-2-core-and-shell-energy-modeling-guidelines> describes how the HVAC systems should be modeled for the Core and Shell Building, but not for the Tenant Spaces. Appendix 2 also describes the requirement for modeling separate meters.

Thank you,
Bill

William Bishop, PE, BEMP, BEAP, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer

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