[Bldg-sim] Energy Model from Green Star (LEED) to predictive model

Kapil Upadhyaya KapilU at kirksey.com
Thu Jan 24 14:08:27 PST 2013


Get utility bills (if you can), or Use Energy Star or CBECs for a reference building (CBECs median may be higher than a 1930 building !); based on these, you can present a range between 'simulated' savings and 'estimated' savings.

Kapil Upadhyaya, LEED AP
Associate
Kirksey | Architecture

From: Jason Quinn [mailto:jason.e.quinn at gmail.com]
Sent: Wednesday, January 23, 2013 9:38 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Energy Model from Green Star (LEED) to predictive model

I've ALWAYS avoided predictive modeling (telling a client your energy usage will be below X) as I've been scared. Now I'm pretty deep into a project performing Green Star energy modeling and my client has popped the question.

We've discussed "why it is hard" and the big three un-knowns: Infiltration, Occupant behavior!!, and Actual Weather. They still want me to go forward and are willing to put a bunch of caviates and an agreed margin on the results.

This is an old 1930's building 200,000 sq ft with original metal window frames (single pane) that will not be replaced (heritage). We're insulating the roof and basement ceiling and a completely new HVAC system. Is there a standard process I can follow or specific suggestions the community could offer?

So far my idea is to try and guesstimate infiltration, box in comfort behavior with lease agreements and a survey, and put some margin on weather.

--
Jason
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