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

[Morgan Heater]

I've been getting within 10% without calibration on the last five or six
buildings I've done where I've tracked the bills afterwards.  The key is
to be thorough and careful.  If you're not getting reasonably close, how
can you justify your recommendations for energy efficiency measures?

 

 

Morgan Heater, P.E.

BEMP, LEED AP

morgan at ecotope.com

206-322-3753

206-596-4709 Direct

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Kapil
Upadhyaya
Sent: Thursday, January 24, 2013 2:08 PM
To: Jason Quinn; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Energy Model from Green Star (LEED) to predictive
model

 

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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