[BLDG-SIM] Performance Metrics

[Marcus Sheffer <sheffer@xxxxxxxxxxxx>]

Going by the Energy Cost Budget Method of compliance in 90.1 there are
relatively few parameters which can be changed.  However, the rules
are somewhat different for a LEED comparison.  90.1 does not allow a
comparison between radically different HVAC systems for example, a LEED
comparison does.  Check out the pertinent sections in the LEED
Reference Guide for a complete discussion of what is and is not allowed
in a LEED comparison, it is different than a strict 90.1
comparison.  This would account for the difference in the 35% going
by 90.1 and the higher values in LEED.  We just submitted a project
that exceeded 90.1 by 55% using the LEED allowed methods of
comparison.

At 06:45 PM 6/5/2001 -0600, you wrote:
> We have
> been involved locally with trying to use ASHRAE 90.1, both 1989 and 1999
> as a metric in new building design - i.e., `xx% better than code minimum'
> for both LEED compliance and for a State buildings program. I know there
> are a number of similar programs and initiatives throughout the country.
> I am also slated to give a presentation on "Issues Around Using
> ASHRAE 90.1-1999 as a Metric" at the ASHRAE Annual meeting in June
> (Seminar 28). 
> I'm looking for two things - first what
> experiences have people had with `exceeding' the code by x%? I've heard
> rumors that a reputable simulation firm said 35% can't be done if you
> strictly interpret the code. LEED provides credit for 40% and 50%
> improvements. We've been using a completely arbitrary target of 35%,
> which with a little  c o d e  stretching seems to be
> obtainable. What is realistic based on your experience?
> Second, I would like to get some feedback on
> the whole `using 90.1 as a metric` issue that I might include in my
> presentation to round it out a little. 
> Any feedback would be appreciated and of course
> I would credit anything I used in the Seminar. 
>
> Mark E. Case, P.E. 
> etc Group, Inc.

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