[Bldg-rate] [Bldg-sim] FW: new DES document is now posted

[Paul Erickson]

Chris/Others,

I'm wondering if you've understood the new document as I have for CHP.  If you have CHP and are pursuing Performance Path Option 2, you actually still have to model the Proposed building twice, once with utilities that you're purchasing from the CHP plant to determine the HW and/or CHW fractions related to "CHP Electric Output" and the other as having virtual chillers/boilers.  What had seemed more straightforward on the surface isn't quite so once you dig in.

In general I'm curious how others have perceived the document.  The flexibility to consider annualized performance is great, especially for straightforward boiler/chiller DES, but it seems like many clients (mainly universities) will still not be able to provide the required level of data resolution needed to document CHP performance.  Perhaps this will be a new impetus for performance monitoring. 

Regards,
Paul

PAUL ERICKSON  LEED® AP 
SR. SUSTAINABLE DESIGN CONSULTANT
 
AEI | AFFILIATED ENGINEERS, INC.  
5802 Research Park Blvd. | Madison, WI  53719

P: 608.236.1112 | F: 608.238.2614  
perickson at aeieng.com  |  www.aeieng.com  



-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Christopher Schaffner
Sent: Tuesday, August 24, 2010 2:20 PM
To: Snarski, Marty; Bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] FW: new DES document is now posted

I think y'all have misunderstood the new DES guidance. It's designed to
simplify things. 

Under the old guidance you had to run the model twice - once as a stand
alone building, then again including the district energy plant.

Now you have a choice - you can run it either way.

If you are a v2009 project, the new guidance is optional. If you want to do
it the hard way, no one will stop you.
--

Chris Schaffner, PE
LEED AP BD&C
LEED AP ID&C
LEED Faculty
Founder and Principal

The Green Engineer, LLP
Sustainable Design Consulting
50 Beharrell Street
Concord, MA 01742
T: 978.369.8978
M:978.844.1464
chris at greenengineer.com
www.greenengineer.com


On 8/24/10 2:43 PM, "Snarski, Marty" <msnarski at shwgroup.com> wrote:

> Does anyone know what is meant by the paragraph at the bottom of Page 4:
> 
> " LEED v2009 projects are not formally required to use this guidance at this
> time, but using it is highly recommended to help ensure a smooth LEED
> certification review. USGBC is working to incorporate this guidance into LEED
> v2009 more formally, but that process is not yet complete."
> 
> Does this mean we don't need to perform the whole upstream equipment modeling
> part?
> 




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