[Bldg-sim] LEEDmodelingrequirements forexistingbuildings

David S Eldridge DSE at grummanbutkus.com
Mon Aug 25 09:05:02 PDT 2008

Also to backup/justify Amanda's and Fred's posts -- if the project is a renovation where mechanical and lighting are replaced, but there are no envelope modifications, then the building permit probably excludes the envelope and 90.1 would not apply to those components.

It would make sense then to fill the parameters into both models as equal in both cases where it was excluded from the permit.


> -----Original Message-----
> From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-
> bounces at lists.onebuilding.org] On Behalf Of Amanda Bogner
> Sent: Thursday, August 21, 2008 11:12 AM
> To: 'Mark Sorensen'; 'Carol Gardner'; 'Jeff Ross-Bain'
> Cc: 'Eric O'Neill'; bldg-sim at lists.onebuilding.org
> Subject: Re: [Bldg-sim] Spam:Re: LEEDmodelingrequirements
> forexistingbuildings
> The way I understand it is as follows:
> 1.  All parameters in basecase and as designed case = existing conditions
> if
> not being altered.
> 2.  If improvements will be made to component X in the as designed case,
> the
> basecase component X = 90.1 requirements.
> So, for example, if the envelope is not being altered, set it to existing
> conditions in both the basecase and as designed models if the information
> is
> available.  Otherwise, you can use 90.1 values in both models.  If the
> glazing is going to be updated as part of the renovation, the basecase =
> 90.1 requirements, the as designed case = new glazing.
> A similar situation applies to system improvements.  For example, if a VFD
> is going to be added to the cooling tower fan, the basecase will need to be
> modeled as a two-speed fan per the requirements of 90.1, regardless of what
> is existing.
> Essentially, the existing building basecase becomes a moving target as
> energy improvements are considered.
> If feel this is incorrect, please let me know.

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